[TEST] selective sync

README.md

@@ -1,6 +1,6 @@
 # PLWL — Portable Linux Wine Launcher
 
-A portable launcher for Windows games and applications on Linux.
+A portable launcher for Windows games and applications on Linux — and for native Linux apps, run with their own home and a chosen isolation level (bubblewrap when available).
 
 ## Portable layout
 
@@ -9,7 +9,7 @@ Everything the launcher needs lives next to the executable:
 ```
 ./files/
   wines/           imported Wine / Proton builds
-  wineprefixes/    wine prefixes
+  wineprefixes/    wine prefixes (a native Linux app's data lives in <prefix>/linux_pfx)
   apps/            imported app folders (optional)
   data/            launcher config (apps.json, settings.json)
   translations/    translation files
@@ -36,9 +36,40 @@ npm start
 
 Besides copy/move/leave, an app can be imported **from a prefix**: nothing is copied — paths are stored relative to the prefix, so wine sees the app as installed on `C:\` (registry entries keep working). Plain prefixes (`drive_c` on top) and Proton ones (`pfx/`) both work. The app stays tied to that prefix; removing the entry never deletes prefix files. A prefix can be renamed later — the folder moves and everything stored relative follows. Edits wait for running apps: renaming/deleting a prefix in use (or moving the default away from an app without its own) is refused with the app to close first; deleting a prefix that still has apps is refused too. Imports recreate symlinks (relative when the target belongs to the launcher) and keep permissions, so an imported game runs straight away.
 
+## Native Linux apps
+
+The import dialog starts with a choice: **Windows app (Wine / Proton)** or **Linux app (native)** — after that both go through the same copy/move/leave steps.
+
+The entry point is found automatically in the picked folder: an ELF binary or `.AppImage` (with the executable bit), or a `.desktop` entry whose `Exec=` points at one. Libraries (`lib/`, `share/`, …) are skipped, and the icon comes from the `.desktop` `Icon=`, an image next to the program, or the system theme.
+
+A native app runs with its **own home folder**: `HOME`, `XDG_CONFIG_HOME`, `XDG_DATA_HOME`, `XDG_CACHE_HOME` and `XDG_STATE_HOME` point into `files/wineprefixes/<prefix>/linux_pfx/`, so config, cache and state land there instead of in your `~`. The prefix select in the app's config picks which one; **Open data folder** takes you to it. `linux_pfx` is part of its prefix like everything else: a sync carries it with the prefix — Linux apps and their data travel in the same categories as the Windows ones.
+
+When **bubblewrap** is installed *and* usable (PLWL probes it with a real run, not `which bwrap` — Ubuntu's AppArmor profile kills it even when it is installed), the two sandboxed levels also give the app its own namespaces: `/` is mounted read-only, so only **its home folder and its own app folder stay writable** — anything else fails with `EROFS`. Relaxed adds exactly one mount on top of that profile (the writable host filesystem described below); everything else on this page is the same at both levels. The app folder is included on purpose: portable apps keep their logs and data next to themselves (Prism Launcher refuses to start otherwise). System trees are never handed out writable, not even when the app itself lives in one. Screens, audio (X11/Wayland, PulseAudio/PipeWire), gamepads and networking keep working. `XDG_RUNTIME_DIR` stays the host's, so the session bus is shared — the sandbox is not airtight, and the UI says so rather than pretending.
+
+A file your desktop hands the app — a drag-and-drop from your file manager, a file picked in a file dialog — is named by its **real path** (`/home/you/Downloads/mod.jar`), and inside the sandbox that name is the app's own redirected home. At **Relaxed** your home folders are linked back into the app at those very paths, through the writable mount, so the drop opens where it lies and a save lands on your real file; the one name left alone is the folder the app itself lives in, which keeps its plain path (a link there turned a launcher app's own instances into a `/tmp` path, which Prism Launcher refuses to see as permanent). At **Isolated** there is no view to link into, and what reaches the app there is only what the launcher hands it, as a copy (see the levels below).
+
+The redirected home starts with a **copy of your desktop preferences** — `kdeglobals`, the GTK 3/4 settings and `user-dirs.dirs` — so the app keeps your theme instead of falling back to its built-in light look. The copy keeps following your host as long as the app has not changed it: a theme change arrives on the next launch, and the moment the app writes its own version, PLWL never touches it again. Your own **fonts, icons, themes and colour schemes are not copied but mounted read-only** inside the sandbox and added to `XDG_DATA_DIRS`, so they follow the host live and nothing can be written back to your `~`.
+
+**Anything the app wants to open is opened by your own desktop.** A **link** goes to the host's xdg-desktop-portal, so it lands in the browser you actually chose instead of one resolved in here, where the default association and its `.desktop` file are behind the redirected home — that used to mean a system browser you never picked, or nothing at all. Both routes reach the portal: `xdg-open` itself (what Qt, Prism and Electron call) and GIO's in-process resolution (`gtk_show_uri`). A **folder or a document** (Prism's *Open Pack Folder*, a text file, a drop) takes the other route: the app leaves the target in its own home, PLWL picks it up, translates the path back out of the sandbox and opens it with your `xdg-open` — so it arrives in your file manager, and a scheme nothing handles gets your desktop's own *Choose an application* dialog rather than a guess. On a machine without a portal nothing is changed — a link then behaves exactly as it did before. A KDE-native app that resolves the link in-process through KIO (Dolphin, Kate) is the one path still left out: it asks KDE's own handler database, which has no answer in here (measured: `kde-open` opens nothing and reports success).
+
+Every prefix in the **Wine prefixes** tab has a **Reset Linux config** button: it deletes the desktop preferences PLWL copied in (and the hashes that track them), so the next app start seeds a clean copy from your system — the way back when an app has hijacked a seeded file with its own theme. App data in `linux_pfx` is never touched, and an app running from that prefix blocks the reset.
+
+Imported trees get **normalised permissions**: every file gets the owner's `rwx` and an `x` mirrored from its `r`, because sources come from archives, FAT sticks or read-only backups where those bits are simply not there. An import whose copy could not reproduce every file is **refused** and the partial copy is removed, so a half-copied app is never registered.
+
+Some apps draw their window icon themselves, which Wayland does not allow — Minecraft (LWJGL 3.4+) is the known case: its taskbar icon turns into the generic Wayland one. The per-app **Force X11 (XWayland)** switch moves the app *and the programs it launches* back to X11, where the icon works again.
+
+Per app you choose the **Isolation** level — what the app gets besides its own home folder:
+
+- **None** — a plain run. The app sees your real filesystem exactly as any other program of yours does: what a shortcut hands it works, including into an app that is already running.
+- **Relaxed** — the sandbox *plus* your whole filesystem mounted writable at `/tmp/plwl-fs-root`. A document handed over behaves natively — it opens where the app was told it is, it can be saved, and it also reaches an app that is already running, because the mount is there from the first second of every run. Your home folders are linked back into the app through that mount, so a file you drag onto the app, or pick in its own dialog, opens at its real path too. The price is real and the UI says it: at this level the app can change anything your user can.
+- **Isolated** — the sandbox without that mount. The system stays read-only, and a document handed over is **copied** first, into `plwl-handoff` inside the app's own home folder; the app works on that copy (so the original cannot be touched), and a copy big enough to be noticed shows a progress popup in the launcher. There is no view of your home here, so a drop from your desktop or a file picked in a dialog cannot reach the app — only what the launcher hands over does, as that copy.
+- **Automatic** (default) — Relaxed where bubblewrap works, None where it does not.
+
+An explicit Relaxed or Isolated on a machine without a working bubblewrap **refuses to start** instead of quietly dropping the promise; Automatic is the one level allowed to weaken itself. What the app really ran as is always visible: a badge on the library card, a `[plwl] isolation: …` line in the app log, and a status card in Settings with **Check again**. When bwrap is missing, PLWL says so once instead of quietly launching without it.
+
 ## "Open with PLWL"
 
-The desktop entry registers `.exe/.msi/.bat/.cmd/.lnk` in file managers. Opening one shows a popup to pick the **Wine/Proton build** and **prefix** for that run (defaults preselected, nothing imported). A second instance hands the path to the running one. App shortcuts work as **Open With** targets too: the app receives the file as the Windows path it would get on Windows — `C:\...` inside its prefix, `Z:\...` otherwise. A file handed to an already running app goes to that instance instead of a second tracked run.
+The desktop entry registers `.exe/.msi/.bat/.cmd/.lnk` in file managers. Opening one shows a popup to pick the **Wine/Proton build** and **prefix** for that run (defaults preselected, nothing imported). A second instance hands the path to the running one. App shortcuts work as **Open With** targets too: the app receives the file as the Windows path it would get on Windows — `C:\...` inside its prefix, `Z:\...` otherwise. A file handed to an already running app goes to that instance instead of a second tracked run. A **Linux app shortcut** is an Open With target the same way, and what the app is handed depends on its isolation level: at **None** the plain absolute path, at **Relaxed** the same file through the writable host mount (`/tmp/plwl-fs-root/…`) — which is also the only shape an app that is *already running* can resolve, since a mount cannot be added to a live sandbox — and at **Isolated** a copy in `plwl-handoff` inside the app's own home folder, so the original stays untouched.
 
 ## LAN syncing
 
@@ -46,13 +77,19 @@ Two PLWL installs on one LAN can mirror each other (sidebar → **LAN syncing**)
 
 - **Device ID** (24 chars) and **Sync code** (8 chars, letters+digits, case-insensitive), both re-rollable. A caller must prove it knows its own code; each verification costs 2 s and one may run at a time, so guessing is pointless. A correct code still opens an **Accept/Decline popup** on the receiver (60 s timeout); declining or ignoring never touches this machine and keeps the pairing.
 - **Devices on your network** are found over UDP and visible only while PLWL runs there (a few seconds after it closes they are gone).
-- Pick what to push: **portable apps**, **prefix-imported apps**, **Wine/Proton builds**, **prefixes**, **Sync settings**. Only what is ticked travels — without **Sync settings** the other machine's defaults and app configs are untouched. An accepted code is stored with the device ID, so later syncs need no typing; a re-rolled code is forgotten and asked for again.
+- Pick what to push: **portable apps**, **prefix-imported apps**, **Wine/Proton builds**, **prefixes**, **Sync settings**. Each category also has a **Select** list: everything starts ticked, and unchecking an app, a build or a prefix keeps that item on both machines untouched. Only what is ticked travels — without **Sync settings** the other machine's defaults and app configs are untouched. An accepted code is stored with the device ID, so later syncs need no typing; a re-rolled code is forgotten and asked for again.
+
+  A prefix-imported app's own folder lives inside its prefix, not in `files/apps/`. Unchecking such an app leaves that folder alone even when the prefix itself is synced: the sender takes it out of the prefix unit and marks it as off-limits for deletion. The picker says so when the app is ticked but its prefix is not — the folder then stays behind with the prefix.
 
 **Both machines show a progress popup** (phase, unit, files, per-category counters like `Apps: 2/5`, transferred vs. planned bytes; the bar follows the current phase). The popups cannot be dismissed, and a sender hashing a big unit shows *Waiting for the other device…* instead of a dead popup — the sender pings while it works. They close on completion, or after 15 minutes of silence (and reopen if the sync turns out to be alive).
 
-The **sender is the source of truth**: differing files are overwritten, missing ones written, extras inside the synced trees (`files/apps/`, `files/wines/`, `files/wineprefixes/`, `files/data/icons/`) deleted. Files are compared with BLAKE2b-512 (SHA-512/SHA-256 fallback); **Force sync all files** skips the comparison. Hashes are cached per file (size + mtime), so an unchanged library costs nothing to re-sync. Permissions travel with the files, and symlinks are sent as **relative** paths whenever the target belongs to the launcher (a Proton prefix's links into its build keep working on the other machine); `dosdevices` and targets outside `files/` stay absolute, and links wine itself rewrote to absolute are relativized again on the wire, on import and before every run.
+The **sender is the source of truth for what it sends**: differing files are overwritten, missing ones written, and extras inside the synced trees (`files/apps/`, `files/wines/`, `files/wineprefixes/`, `files/data/icons/`) are removed — but only after the receiver says so. Nothing is deleted while the bytes move: each unit only *plans* its leftovers, and the receiver gets one popup at the end with the top-most folders that would go (a fully redundant folder is a single collapsed row, a partly redundant one can be expanded). Every row is ticked to delete; unchecking a folder or a file keeps it. **Keep everything** is always one click away, an unanswered or expired list removes nothing, and a tree the sender could not fully read is never pruned at all, because a missing entry may only mean it was unreadable.
 
-A sync also carries **how apps are set up**: wine build and prefix, args, env, DLL overrides, playtime and last played. **Sync settings** carries the registry-level part even when no files move: default wine/prefix, custom build names, prefix registry, every app's configuration and the library order. It only patches what already exists (unknown ids are ignored, unknown apps/prefixes stay), deletes nothing, and playtime only grows — the higher counter wins. Language, window settings, logs and external (leave) apps stay local.
+That review is the only deletion path, so no backup copy is ever made — the files simply stay on disk until the answer. Two things it cannot undo: files that exist on both sides with different content are **overwritten** with the sender's version (the popup says so; if a game is installed on both computers, leave its prefix out of the sync), and a file kept in one sync is proposed again the next time, since the mirror is recomputed from scratch every run.
+
+Only one sync runs at a time (a second attempt on the same machine answers *busy*), and a transfer cut off mid-file leaves no half-written file behind. Files are compared with BLAKE2b-512 (SHA-512/SHA-256 fallback); **Force sync all files** skips the comparison. Hashes are cached per file (size + mtime), so an unchanged library costs nothing to re-sync. Permissions travel with the files, and symlinks are sent as **relative** paths whenever the target belongs to the launcher (a Proton prefix's links into its build keep working on the other machine); `dosdevices` and targets outside `files/` stay absolute, and links wine itself rewrote to absolute are relativized again on the wire, on import and before every run. A peer that predates the review cannot sync units at all (it would prune without asking); update both machines.
+
+A sync also carries **how apps are set up**: wine build and prefix, args, env, DLL overrides, a native Linux app's isolation level and Force X11, playtime and last played. **Sync settings** carries the registry-level part even when no files move: default wine/prefix, custom build names, prefix registry, every app's configuration and the library order. It only patches what already exists (unknown ids are ignored, unknown apps/prefixes stay), deletes nothing, and playtime only grows — the higher counter wins. Language, window settings, logs and external (leave) apps stay local.
 
 ## Wine & Proton support
 

development.md

@@ -13,9 +13,19 @@ src/               main process (Node/Electron backend)
     index.js       handler registration, icon protocol, dialogs
     games.js       games service: run/stop state, wine resolution, open-with handoff
     lansync.js     LAN sync handlers (identity, devices, re-roll, sync + progress)
-  runner.js        spawns wine/proton (env, prefix, playtime, logs)
+  runner.js        spawns wine/proton (env, prefix, playtime, logs) and owns
+                   spawnTracked() - the log/playtime/exit tail every run shares
+  linuxrunner.js   native Linux apps: redirected HOME/XDG, the isolation level
+                   (none/relaxed/isolated/auto), the handed-document path and
+                   the relaxed home redirects
+  openrelay.js     the launcher side of the hand-off: the request folder an app
+                   leaves what it wants opened in, watched while it runs
+  linuxapp.js      native app detection (ELF/AppImage/.desktop) + icon lookup
+  sandbox.js       bubblewrap probe (functional, cached) + buildBwrapArgs
+                   (+ FS_ROOT, the one mount the relaxed level adds)
   library.js       apps registry (apps.json) + settings + playtime files, plus
-                   the "which prefix does this app use" / in-use guards
+                   the "which prefix does this app use" / in-use guards and
+                   the isolation-mode gate on the way in
   wines.js         wine/proton build scan, registry, portable symlink healing
   prefixes.js      prefix registry (files/wineprefixes)
   symlinks.js      relative symlink rewiring + executable-bit restoration
@@ -34,6 +44,8 @@ src/               main process (Node/Electron backend)
                    (with its receive-progress hook); uses hashcache.js,
                    lansync-identity.js, lansync-manifest.js, lansync-discovery.js
   lansyncpush.js   the pushing side (createPusher factory, keeps helper state out)
+  lansync-plan.js  planned (never immediate) deletions: the receiver's leftovers,
+                   top-most folders, and execution of only what was approved
   hashcache.js     file hash cache (path -> size/mtime/hash) for LAN sync
   lansync-identity.js  identity + sync code (createIdentity factory)
   lansync-manifest.js  sender-side manifest building (createManifestBuilder)
@@ -60,24 +72,61 @@ Renderer never touches Node/Electron directly — everything goes through the `w
 - No duplicate logic: the second time you copy something, move it into a helper and call it from both places.
 - Everything user-visible goes through the translation files (en-us.json, pl.json) with `{0}`, `{1}` placeholders. No hardcoded strings in app.js.
 - Paths stored on disk are FILES-relative (portable layout): write with toPortablePath(), read with resolvePortablePath() — never store absolute paths for anything inside files/.
-- Registries (apps.json, wines.json, prefixes.json) are rewritten whole via writeJson(); playtime lives in its own tiny file so the registry is not rewritten while a game runs.
+- Registries (apps.json, wines.json, prefixes.json) are rewritten whole via writeJson(); playtime lives in its own tiny file so the registry is not rewritten while a game runs. A settings sync batches its patches instead of one write per app/build (`library.updateGames`, `wines.applySettings`).
+- Tree walks (`copyTree`/`treeSize`/`removeTree`/`chmodTree`) keep TREE_CONCURRENCY operations in flight instead of one syscall per await. `copyTree` returns a `failed` count; an import that could not reproduce every entry is refused and its partial destination removed, never registered with holes.
+- The app's own folder is `library.appFolder(game)` — the folder it was imported as, never `workdir` and never `dirname(exePath)`. The properties may point the working directory elsewhere, and the sandbox, the delete path and LAN sync all have to agree on the same tree.
 - Deleting user data needs a confirm modal; best-effort cleanup is try/catch-and-ignore with a comment saying why it is safe to ignore.
 - Windows apps run through runGame()/buildEnv() — never spawn wine directly elsewhere (prefix handling, Proton env and playtime live there).
+- Native Linux apps run through linuxrunner.runLinuxGame()/buildLinuxEnv() the same way: HOME and the XDG folders are redirected into `{prefix}/linux_pfx/`, and bwrap (when the probe says it works) forces the same layout with mounts. Never spawn a native app elsewhere. `game.kind` is absent on old entries — that means Windows; `game.isolation` is one of four levels, resolved by linuxrunner.resolveLevel: `none` (plain run), `relaxed` (bwrap + the whole host filesystem mounted writable at sandbox.FS_ROOT) and `isolated` (bwrap with the stock read-only profile), with `auto` (default) meaning relaxed where bwrap works and none where it does not. Only `auto` may weaken itself — an explicit relaxed/isolated answers `sandbox-required` instead ("no silent downgrade"). library.js keeps exactly these four values, both when reading the registry and when a patch is saved (anything else falls back to `auto`), and the level always lands in the log and the UI. resolveLevel awaits the probe when nothing has measured yet: a shortcut boots HEADLESS, so no renderer ran `sandbox:status` — without that wait `auto` would read an empty cache and quietly pick `none` (and an explicit level would refuse a machine that can sandbox perfectly well).
+- Under bwrap ONLY two things stay writable: the redirected home and the app's own folder (`writableAppDir`: inside files/apps, or the folder the app was imported from — never `/usr`, `/etc`, `/bin`… and never files/wines). Portable apps write logs and data next to themselves and a read-only app folder makes them refuse to start (Prism Launcher: "couldn't create a log file - Read-only file system"). That bind is written LAST in buildBwrapArgs on purpose: an app lives under the host's home and the redirected home is mounted over that very directory, so the bind used to be swallowed by it and bwrap answered `execvp <app>: No such file or directory` — a click on Play and the window closed again (measured on 0.12.0, and again as a real exec in test/sandbox-appdir.test.js). Everything else is `EROFS` by design — at the isolated level. Relaxed is the deliberate exception and says so in the UI: `FS_ROOT` is the same filesystem, mounted writable, so "everything else" is only unreachable through the real paths.
+- Two pipes feed one log in spawnTracked: neither may end the stream (pipe(ws, { end: false }), closed when both sources drained, at the latest LOG_DRAIN_MS after the exit) and the write stream carries an error listener. Ending it at `exit` while a pipe still had data killed the whole launcher with ERR_STREAM_WRITE_AFTER_END.
 - A prefix or wine build a running app uses cannot be renamed/deleted (wine holds files open there): the guards sit next to the handlers in src/ipc/, use the games service's running list plus library.js helpers (prefixNameForGame/gamesUsingPrefix/is*InUse) and answer `{ ok:false, error:'inUse'|'hasApps', apps:[names] }` for the toast.
-- Long operations stream progress through the single import:progress slot as `{ phase: 'count'|'copy'|'remove', files, bytes, totalFiles, totalBytes }` (runWithProgress for deletes/imports). Emit 'count' (a treeSize walk) first, copy/remove through the fsutil helpers.
+- Long operations stream progress through the single import:progress slot as `{ phase: 'count'|'copy'|'remove', files, bytes, totalFiles, totalBytes }` (runWithProgress for deletes/imports). Emit 'count' (a treeSize walk) first, copy/remove through the fsutil helpers. An isolated hand-off has its own slot, handoff:progress (`{ phase: 'copy'|'done'|'error', name, bytes, totalBytes, notice }`), because it can start before the window exists: main.js gets the event first and, when `notice` is set (a copy above linuxrunner.STAGE_NOTICE_BYTES), puts the launcher window up so the renderer's popup can be seen; below that the copy is over before a window could paint. Copies of one file go through fsutil.copyFileProgress (streamed, throttled by progressGate, `.part` + rename).
 - CSS: reuse the existing variables/classes (.button, .field-label, .custom-select, form-card); spacing comes from --button-margin and flex gaps, not per-element magic numbers.
+- The blanket `transform: translateZ(0)` (crisper small glyphs) makes every element its own stacking context, so a select's own z-index cannot escape the wrapper it sits in: a list opened inside `.linux-only`, `.win-only` or an override row was painted UNDER the field label and textarea that follow it (measuring with `elementsFromPoint` over the open list returned the label). CustomSelect lifts the chain instead of the host — `lift()` adds `.select-lift` to every STATIC ancestor while the list is open, and `close()`/`closeAll()` take it off again; positioned ancestors are skipped, so the fixed modal overlay keeps stacking over every view on its own.
+
+### Native Linux apps
+
+- Entry point detection (linuxapp.js): ELF, `.AppImage`, or a `.desktop` whose `Exec=` points at one; `lib/`, `share/` … are skipped. The icon comes from the `.desktop` `Icon=`, an image next to the program, or the system theme — `extractIconFromExe` is PE-only.
+- The redirected home starts as a COPY of the desktop preferences (kdeglobals, kdedefaults/kdeglobals, gtk-3.0|gtk-4.0/settings.ini, qt5ct/qt6ct, Trolltech.conf, user-dirs.dirs). Without the seed Qt falls back to its built-in light palette (measured: `#eff0f1` against the host's `#202326`). The copy keeps following the host while the app has not touched it: the hashes of what PLWL wrote live in `{prefix}/linux_pfx/.seeded.json`, OUTSIDE the app's home, and a copy with no marker entry (or one the app has since changed) is the app's own and is never overwritten. The PulseAudio cookie is seeded once, because with a redirected home Pulse looks in `$HOME/.config/pulse/cookie` and the app otherwise comes up silent; `~/.Xauthority` is refreshed instead, since nothing exports XAUTHORITY to a sandboxed app.
+- Host fonts/icons/themes/colour schemes are not copied but `--ro-bind` under `/tmp/.plwl-host/…` and prepended to XDG_DATA_DIRS: live, and unable to write back into the user's `~`. Symlinks were measured and rejected — the prefix is mounted ON `~`, so a link to `~/.config/kdeglobals` points at itself (`Too many levels of symbolic links`); without bwrap the same link writes through into the real home.
+- `forceX11` (per app) sets XDG_SESSION_TYPE=x11 + QT_QPA_PLATFORM=xcb + GDK_BACKEND=x11 so the app and everything it launches falls back to XWayland, where window icons still exist at all (Wayland forbids them; a compiled GLFW probe showed XDG_SESSION_TYPE picks X11 vs Wayland, `GLFW_PLATFORM` does not exist). `game.env` still wins.
+- SESSION_MANAGER is dropped in the sandbox: the session socket sits in the private `/tmp`, so the pointer led nowhere (Qt: "Could not open network socket").
+- Imports normalise permissions (fsutil.chmodTree): owner `rwx`, `x` mirrored from `r` (0644 → 0755). Sources are archives, FAT sticks and read-only backups.
+- **Reset Linux config** on every prefix row removes exactly what PLWL seeded (DESKTOP_SEEDS, the pulse cookie, `home/.Xauthority`, `.seeded.json`) plus the folders that existed only for the seed, so the next start seeds clean. syncDesktopConfig can only follow a copy it can still prove is its own; the reset does not argue. App data (`data/`, `cache/`, `state/`, `config/<app>/`, the rest of `home/`) is never touched, and a running app from that prefix blocks it (the usual `inUse` guard).
+- A path the desktop hands the app (a drag-and-drop's `text/uri-list`, a file picked in a dialog - `QT_QPA_PLATFORMTHEME=xdgdesktopportal` on this desktop, so the chooser is the host portal's and answers with a real path) is a real `/home/<user>/…` path, and under bwrap that name is the app's own redirected home. A mount cannot fix it (a mount cannot be added to a namespace that is already running) and binding the host home in would hand the app the user's real folders at every level: `syncHomeRedirects` links the host home's own entries (never a name the profile mounts itself - `.plwl` and the XDG folders, which a link would turn into bwrap's `Can't mount on symlink destination` on the first relaxed run of a fresh prefix, measured; never a name the app already has, never a link resolving nowhere) into the one view the level has - at relaxed to `FS_ROOT/<entry>`, which is the real folder, live and writable (measured: the real file reads through the link, and a write through it lands on it), and at the other levels there is no view to point at, so the links are taken off again before the app starts. The name the app's own folder sits under is never linked either: a portable bundle resolves itself with `readlink -f "$0"`, so the link answered for the app's whole tree - instances included - with `FS_ROOT`, and Prism Launcher read that as "Your instance folder is in a temporary folder: '/tmp'!" on every start (measured on 11.0.2 on the device whose launcher lives in the home; the same app on a launcher outside `~` kept its real path and stayed quiet - the folder is bound at its real path anyway). Only the launcher's own links are removed (matched by their `FS_ROOT` target), and an isolated app gets no home folders at all: what reaches it there is the hand-off copy. The links outlive a run (a hand-off into an app that is already running is still using them); the next start at a level that cannot serve them clears them.
+- With HOME bound straight to `{prefix}/linux_pfx/home`, the user's real `~` is invisible to the app — one reason absolute paths an app wrote into its config before the import (Prism's instance `JavaPath`) do not resolve. `relaxed` does not change that shadowing, but it does make the real filesystem reachable through `FS_ROOT`/home/… — and `none` gives the app the real paths outright, which is what those two levels are for.
+- A clicked link belongs to the host desktop, so it leaves through `org.freedesktop.portal.OpenURI`: the `xdg-open` BINARY is replaced inside the sandbox (a written shim `--ro-bind` over `/usr/bin/xdg-open`, and over the app bundle's own `bin/xdg-open` too — that one sits first in the app's PATH, and its sharun wrapper dies on a closed stderr (`SIGPIPE`) before it ever delegates, which is exactly what Minecraft does after `Runtime.exec`; the name the bundle links to that same file, `gio-launch-desktop`, is answered by the shim, since bwrap refuses to mount over a symlink; a `-`-prefixed argument exits 2, because Java probes for `xdg-open` by running it with one) and Qt execs it (measured — `QGenericUnixServices` picks `xdg-open` first, and reaches the portal itself only under `/.flatpak-info`/`SNAP`, which a bwrap profile does not have); Electron does the same. GIO resolves an URI IN-PROCESS, which no shim can reach: for that the prefix seeds `home/.plwl/open-url` (launcher-written, like the shim) plus a desktop entry and a `mimeapps.list` naming it the default for `x-scheme-handler/http|https`, `text/html`, `x-scheme-handler/file` and `inode/directory`. Without the seed GIO falls back to the host's `/usr/share` list — measured: it offered `brave-origin.desktop`, and `gio open` answered "The specified location is not supported". Measured end to end (both backends): the portal launches the host's `helium.desktop` with the exact URI. `GIO_USE_PORTALS=1` was measured and REJECTED: it opened NOTHING and still reported success (GIO's portal path wants a sandbox marker this launcher does not fake). A KDE-native app resolving the link in-process through KIO (`kde-open`) stays uncovered — KDE ignores the seeded list (measured).
+- The games service owns a run through the entry object it created: a start that failed, and the exit of a PREVIOUS run of the same app (stopped, then relaunched — SIGKILL is asynchronous), may not clear the new run's entry or close its request watcher (`forget`/`handleExit` compare that object). A start still in flight is never pruned, however long its isolated hand-off copy takes, because pruning it would drop the watcher mid-start; Stop during that window only records a kill request (`killRequests`), which the start fulfils the moment it has a pid — clearing the state there instead would let a second launch race past the first. Measured in test/games-service.test.js.
+- The portal is not told about a FOLDER or a document, which is what "Open Pack Folder" or a drop asks for: it cannot see a path from in here and answers `Response` 2 for `file://` (measured, while https answered 0). The shim leaves those in `home/.plwl/open-request` (written as `.part` and renamed, so nothing ever reads half a request) — a live bind of the app's home, so it reaches an app that is ALREADY running — and the launcher opens it out here with the host's own `xdg-open` (openrelay.js: `createOpenRelay` watches that folder for exactly as long as the app runs, consumes each request once, and quits watching on exit). The target is rewritten on the way out — the private `$HOME` back to `{prefix}/linux_pfx/home`, `FS_ROOT` back to `/` at relaxed — so the host opens the REAL folder and never a path that only exists inside. Nothing in the sandbox can start a host program itself: measured, the host's own `xdg-open` run in there ends in `kde-open`, which exits 0 and opens no window at all. A scheme nothing on the host claims ends in the desktop's own "choose an application" dialog, which is the point of handing it out instead of guessing.
+- The portal's `Response` is NOT read back: it is a signal addressed to the caller's own bus connection, so a separate `gdbus monitor` never receives it (measured: 15 calls, 15 timeouts, while the portal did open what it was given) and the readback only cost the app 3 s per click before giving up. Only whether the call went out is trusted, so a machine without a portal needs no special case any more: the call fails, and the request file is what still lands. (0.5.x had the host's own script parked inside the sandbox as the shim's fallback; measured, that route opens nothing.)
+- A file handed over (a shortcut's `--file %f`, a drop on it) is the one path the sandbox cannot see by itself: a file out of the user's home is buried under the prefix home, one out of `/tmp` sits behind the private tmpfs, and the rest of the machine is read-only. Per-file `--bind` (what 0.5.0 did) is the wrong tool: a mount cannot be added to a namespace that is ALREADY running, so a hand-off into a running app could never be served that way. `handedPathFor` instead names the document in the one shape the chosen level can reach, and the app is told nothing else: `none` → the real path; `relaxed` → `FS_ROOT` + the real path; `isolated` → a copy in `{prefix}/linux_pfx/home/plwl-handoff/<name>`, which is a live bind of the app's home, so it reaches a running app too (measured end to end in test/linux-e2e.js: both levels hand a document to a sandbox that is already up). Copies are one per name and refreshed on every open (the folder cannot grow), written through a `.part` name and renamed so nothing ever reads a half-written document, and the app's edits stay in the copy — that IS the level's promise. A handed path that is gone fails the hand-off instead of launching an app with no document.
+- `FS_ROOT` (`/tmp/plwl-fs-root`) is where relaxed mounts the host filesystem, and it has to live under the private `/tmp`: bubblewrap creates the mount point itself, and the root of a read-only root cannot be written to (measured on 0.12.0: `Can't create file /PLWL_FS_ROOT: Read-only file system`, for a `--dir` before the `--ro-bind / /` too). Measured also: through it the real `~` reads, a write lands on the real file, and a file created AFTER a sandboxed run started is visible inside it — that last one is what makes a hand-off into a running app possible at all.
+- Not built: a private or overlay `/etc` (`buildBwrapArgs` accepts `etcRoot`, nothing sets it; `--ro-bind / /` leaves `/etc` read-only, which is all we promise today), `--tmpfs /home` against OTHER users' homes (`hideHome` is plumbed, no UI); app data always lands in `{prefix}/linux_pfx`.
+- Measured, not assumed (Debian 13, kernel 6.12, `bwrap` 0.12.0): the functional probe passes here, no firejail/proot/fuse-overlayfs on the box, `/etc` is 16 MB and its `machine-id` is read-only even on the host.
 
 ### LAN sync
 
 - Two sides: the receiver lives in lansync.js, the sender in lansyncpush.js, built by createPusher(helpers) — several launcher states share the module, so nothing may sit in its module scope. Both sides report their own progress (receiver through the onReceive hook).
+- **Deletions are planned, never inline.** `handleCommit` only walks the unit (`planUnitDeletions` -> `lansync-plan.js`) and stores the list on the session; `/plwl/apply` turns units plus registry leftovers into one review (`startReview`), and `executeReview` is the only place that removes anything. A path in the keep set survives (including a file inside a fully planned folder), an unreadable subtree is planned as kept, and a selection's excluded folders are protected the same way. Registry removals wait with the files, so unchecking an app row cannot leave its entry behind without its folder or the other way round. A review that times out, is skipped (no popup, headless) or never arrives cancels to **zero deletions**. A peer without the `review` flag in its verify answer cannot sync units (`old-peer`): it would prune inside its commit with no list to approve; a settings-only sync stays allowed because it deletes nothing.
 - An incoming sync needs CONSENT: a correct code opens the gate, but the receiver's onIncoming hook (registered in main.js) shows Accept/Decline, answered through lansync:respondIncoming. Unanswered requests expire (INCOMING_TIMEOUT_MS); a decline returns 'rejected' and KEEPS the pairing (the code was proven). Without an onIncoming hook (tests, headless) the gate stays open.
-- Progress is bytes plus per-category counters (items = announced units, itemsDone = finished, totals = everything picked) — "Apps: 2/5". The bar follows the CURRENT PHASE's bytes (barBytes/barTotalBytes) so a phase starts from an empty bar. Hashing and copying walk tens of thousands of files: every per-file update goes through progressGate (~10/s, phase changes forced) — never one IPC message per file.
+- Progress is bytes plus per-category counters (items = announced units, itemsDone = finished, totals = everything picked) — "Apps: 2/5". The bar follows the CURRENT PHASE's bytes (barBytes/barTotalBytes) so a phase starts from an empty bar. Hashing and copying walk tens of thousands of files: every per-file update goes through progressGate (~10/s, phase changes forced) — never one IPC message per file. The gate holds a snapshot FUNCTION on the sender side: the snapshot is built when it flushes, so a throttled update never shows a byte count one gate window old.
-- Registry-level settings are opt-in (the "settings" category, old name "defaults" still accepted as an alias on both sides). The payload carries defaults, wineSettings (displayName + disabled per build), prefixSettings, appSettings (name, wine, prefix, args, env, dllOverrides, disableUmu per app) and appOrder. The receiver only patches what already exists (unknown ids skipped, nothing created or deleted, unknown local entries kept at the end of the order) through the normal helpers (setWineDisplayName, library.updateGame, reorderGames).
+- A finished sync ends with a result POPUP, not a toast: the sender swaps its locked progress modal for the summary, the receiver swaps the finished bar after ~1 s. It lists units per category, files moved/unchanged/removed, bytes transferred and the total size of the synced trees (`summary.sizeBytes`; the receiver adds each unit's announced `unitBytes`, replacing a retried unit's entry instead of double-counting). The device name is set with textContent, never interpolated into the modal HTML.
+- App selection is a seam, not a UI yet: `buildUnits(cats, selection)` and `buildRegistryPayload(cats, selection)` take `selection = { apps: [ids] }` (a missing selection means every app). The payload then carries `appScope: 'selected'`; `applyApps` keeps the apps of that category that were not sent, and skips the `apps/` orphan sweep, instead of mirroring the category. Without the marker the sender's list is complete and extras are deleted as before.
+- The sender's transferred counter counts bytes AS THEY ARE READ (putFile's onBytes callback), not on upload completion: a multi-GB file has to move it while it flies or the sender shows hundreds of MB behind the receiver. A unit's byte total travels as the `{ unitBytes }` control record BEFORE its files; the receiver has to handle it before the entry filter (it has no path/type, so a filter-first order dropped it and the comparing bar measured against a placeholder total of 1 — read as 100% for the whole phase). The comparing phase ends on a full bar, then the copy bar restarts empty (its first PUT byte emits it).
+- While the receiver answers the consent popup (and whenever its side waits on the other one), both popups show "Waiting for the other device…" (lansync.waiting): the sender emits a 'wait' phase before verify, the receiver's ping handler emits stage 'wait'. A unit counts toward "Apps: 1/5" as soon as its comparison starts (not when it commits), and phases without a file count (hash/compare/commit) clear the counter so a stale "3 / 10 files" never lingers. On the wire the receiver's comparing phase is called 'compare' (sender-side 'plan' is unchanged).
+- Registry-level settings are opt-in (the "settings" category). The payload carries defaults, wineSettings (displayName + disabled per build), prefixSettings, appSettings (name, wine, prefix, args, env, dllOverrides, disableUmu, isolation and forceX11 per app) and appOrder. The receiver only patches what already exists (unknown ids skipped, nothing created or deleted, unknown local entries kept at the end of the order) through the normal helpers — batched, so a large library is one registry write: `library.updateGames(patches)`, `wines.applySettings(entries)`, `reorderGames`.
 - File hashes are remembered in files/data/lansync-hashes.json (path -> size + mtime + hash; machine-local, never synced): equal size and mtime means equal bytes, so a repeat sync only stats the tree. Hashing and the receiver's comparison both run HASH_CONCURRENCY files at a time.
+- A file's unit and path travel in the PUT's query, not in headers: Node rejects any header value holding a code above U+00FF (`ERR_INVALID_CHAR`), and a real library has those names (Minecraft pack names, Polish file names) — one such file killed the whole sync, leaving the receiver with half an app and no registry entry. Categories are matched by exact name; anything this build does not know is ignored.
 - File permissions travel with the manifest (`mode`) and are applied after the bytes; a file with the right hash but wrong mode is repaired without re-upload.
-- A sender hashing a big unit is minutes of silence: it pings `/plwl/ping` every HEARTBEAT_MS, the receiver re-arms its popup watchdog (stage 'wait' changes nothing on screen). A receiving popup its watchdog closed reopens on the next real event — only 'done' ends a sync, and reopening never asks for consent again (consent is the onIncoming popup at verify time; the progress popup is driven by the same token's events).
+- A manifest the sender could not finish is not a licence to delete: a read that fails (a directory or file the user cannot open) sends a `{ unitIncomplete: true }` control record, and an aborted plan body is detected with `req.complete`. Either way the receiver still writes what it got but skips `pruneTree` for that unit — a missing entry may only mean "could not read it". For the same reason `applyApps`/`applyWines`/`applyPrefixes` mirror nothing when the payload has no list at all (malformed/truncated apply), while an explicit empty list still means "the sender has none" (a partial app selection excepted: it keeps the apps it did not send).
+- A PUT settles on every failure path (`aborted`/`close` without the body having ended, stream or writer error): the `.plwl-sync-tmp` is removed and the request cannot stay half-open forever. The 60 s `PUT_IDLE_MS` only covers a body that stops sending.
+- Verification is GLOBAL one-at-a-time (`state.verifying` is a boolean, set before the first await — parallel requests would pay the 2 s cost in parallel, which is exactly what makes a scheme pointless). One outgoing sync per process (`syncTo` answers 'busy'), so two syncs can never write the same receiver files at once. A failed bind resolves `{ ok: false, error }` instead of leaving `listening` pending forever, and the beacon only starts when the server is up.
+- Names arriving on the wire that become paths (app ids in `data/icons/<id>`, prefix folder names) are validated (`safeName`/`safePrefixName`): a corrupted or older peer must not be able to store `../../x` and turn a later Rename/Delete click into a write outside files/.
+- A sender hashing a big unit is minutes of silence: it pings `/plwl/ping` every HEARTBEAT_MS, the receiver re-arms its popup watchdog (stage 'wait' shows "Waiting for the other device…" but never while a file is being written). A receiving popup its watchdog closed reopens on the next real event — only 'done' ends a sync, and reopening never asks for consent again (consent is the onIncoming popup at verify time; the progress popup is driven by the same token's events).
+- Native Linux app data (`{prefix}/linux_pfx/`: the redirected home, configs, caches, PulseAudio cookie, state) travels INSIDE its prefix unit like the Windows side of the same prefix: the manifest walks it and the mirror prunes it, so no file of the launcher's own trees is special-cased on the wire. Native apps sit in the same categories as Windows ones (`apps-portable`/`apps-prefix`), and only the per-app fields that are Linux-only (isolation, forceX11) are named as such in the settings payload.
 - A sync must never walk through a symlinked ROOT: pruneTree/healUnitRoots (sync), removeTree/treeSize (fsutil) and healBuild (wines) lstat the root first. `listDirs()` counts symlinked folders as units, so a build on another disk still travels — as the link it is (`wineUnits` maps nested builds to their TOP folder under wines/).
-- Wine/Proton rewrite prefix links to absolute targets whenever they update a prefix, so on-disk links are not always relative after a run: the sync relativizes them on the wire (portableLinkTarget) and refreshWines()/healPrefix() repair what arrived from an older PLWL. A build whose binaries lost the executable bit is detected in refreshWines() and healed once (spawn() on a non-executable `proton` fails with EACCES while the game looks started).
+- Wine/Proton rewrite prefix links to absolute targets whenever they update a prefix, so on-disk links are not always relative after a run: the sync relativizes them on the wire (portableLinkTarget) and refreshWines()/healPrefix() repair absolute links that reached disk anyway. A build whose binaries lost the executable bit is detected in refreshWines() and healed once (spawn() on a non-executable `proton` fails with EACCES while the game looks started).
 
 ### Paths and prefixes
 
@@ -99,12 +148,22 @@ node --check <changed js files>          # syntax
 node test/smoke.js                       # quick sanity
 node test/lansync.test.js                # LAN sync contract (identity, pairing, mirror)
 node test/lansync-receiving.test.js      # receive-side progress events (the popup)
+node test/lansync-progress.test.js       # live sender bytes, comparing bar widths
 node test/lansync-settings.test.js       # playtime, app settings, wine/prefix + defaults
 node test/lansync-links.test.js          # wire: exec bits + relative links
 node test/lansync-pending-links.test.js  # links to files created later, startup heal
 node test/lansync-consent.test.js        # accept / decline / timeout gate
 node test/lansync-token.test.js          # long-sync token expiry (sliding TTL)
 node test/bench-sync.js                  # timing: cold vs cached sync
+node test/linux-sandbox.test.js          # bwrap argv profile + the four levels, handed paths, mode gate
+node test/sandbox-appdir.test.js         # the app folder stays reachable inside its own redirected home
+node test/linux-env.test.js              # redirected HOME/XDG_* for both backends
+node test/linux-import.test.js           # ELF/AppImage/.desktop detection + icons
+node test/linux-links.test.js            # link opening: shim binds + mime seed
+node test/linux-open.test.js             # what an app opens: the script + the launcher relay
+node test/games-service.test.js          # run bookkeeping: the request watcher, Stop while starting
+node test/lansync-linux-apps.test.js     # Linux apps + linux_pfx travel with their categories
+node test/linux-e2e.js                   # REAL runs: plain, relaxed (+ its mount), isolated, hand-off into a running app
 npm start                                # click through the flow you touched
 
 # Repairing / testing a real instance (test/ scripts are gitignored helpers):

files/translations/en-us.json

@@ -34,8 +34,14 @@
     "library.removeConfirm": "Remove {0} from the launcher?{1}",
     "library.removeFilesNote": "\nIts imported files in files/apps will also be deleted.",
     "library.removePrefixNote": "\nFiles stay in the prefix, only the launcher entry is removed.",
+    "library.removeLinuxDataNote": "\nIts files in files/apps are deleted; its data in the prefix is kept.",
     "library.tools": "Wine tools",
     "library.reorderHint": "Drag to change the order",
+    "import.kind.title": "What are you importing?",
+    "import.kind.windows": "Windows app (Wine / Proton)",
+    "import.kind.windowsHint": "Runs through wine or proton.",
+    "import.kind.linux": "Linux app (native)",
+    "import.kind.linuxHint": "Runs directly on this system, with its own isolated home folder. Needs an ELF binary, an .AppImage or a .desktop file.",
     "import.question": "Should the app files be brought into the launcher so it stays portable, or left where they are?",
     "import.mode.copy": "Copy into launcher (portable)",
     "import.mode.move": "Move into launcher (portable)",
@@ -58,9 +64,12 @@
     "import.done": "Import finished",
     "import.failed": "Import failed: {0}",
     "import.noExe": "no .exe file found in the selected folder",
+    "import.noLinuxExe": "no runnable Linux program found in the selected folder (ELF binary, .AppImage or .desktop)",
     "import.prefixRoot": "this folder is a wine prefix (or its C: drive) - import an app from inside its drive_c instead",
+    "import.copyIncomplete": "some files could not be copied - nothing was imported, the source folder is unchanged",
     "config.title": "App configuration",
     "config.icon.auto": "Extract from exe",
+    "config.icon.autoLinux": "Extract icon",
     "config.icon.browse": "Choose image",
     "config.icon.remove": "Remove icon",
     "config.icon.pick": "Choose an icon image",
@@ -80,6 +89,23 @@
     "config.prefixDefault": "Default prefix ({0})",
     "config.prefixLocked": "This app was imported from a prefix, its prefix cannot be changed",
     "config.prefixLockedHint": "Pinned to the prefix it was imported from (its paths are stored relative to it)",
+    "config.linuxDataRoot": "Data folder (prefix)",
+    "config.linuxDataRootHint": "A native app keeps its home, config and cache in linux_pfx inside this prefix.",
+    "config.openData": "Open data folder",
+    "config.linuxKindValue": "Linux",
+    "config.isolation": "Isolation",
+    "config.isolation.auto": "Automatic",
+    "config.isolation.none": "None",
+    "config.isolation.relaxed": "Relaxed",
+    "config.isolation.isolated": "Isolated",
+    "config.isolationHint.auto": "Relaxed where bubblewrap works; on a machine without it the app runs without isolation.",
+    "config.isolationHint.none": "No sandbox: the app sees, and may change, everything your user can.",
+    "config.isolationHint.relaxed": "The whole disk is mounted writable as /tmp/plwl-fs-root.",
+    "config.isolationHint.isolated": "The system is read-only.",
+    "config.isolation.bwrap": "bwrap {0} (available)",
+    "config.isolation.env": "no sandbox: {0}",
+    "config.forceX11": "Force X11 (XWayland)",
+    "config.forceX11Hint": "Runs the app through XWayland instead of Wayland. Useful when a window cannot carry its own icon or misbehaves on Wayland.",
     "config.disableUmu": "Disable UMU (launch with wine directly)",
     "config.disableUmuHint": "Runs the game with the build's own wine binary instead of its umu.exe/steam.exe launcher. This is the closest to a plain wine run.",
     "config.dllOverrides": "DLL overrides",
@@ -88,6 +114,27 @@
     "config.overrides.setting": "Setting",
     "config.overrides.remove": "Remove",
     "config.overrides.hint": "Wine module names, e.g. dinput8. native,builtin (the default) loads a DLL shipped with the game and falls back to Wine's builtin; disabled blocks the module.",
+    "sandbox.title": "Linux app isolation",
+    "sandbox.hint": "Native apps always run with a redirected home folder, so their config and cache stay in the prefix. The isolation level says what else they get: None is no sandbox at all, Relaxed mounts the whole disk writable, Isolated writes nothing outside the app's own folders and copies an opened file into its home folder.",
+    "sandbox.status": "Status",
+    "sandbox.check": "Check again",
+    "sandbox.rechecked": "Isolation checked again",
+    "sandbox.reason.missing": "not installed",
+    "sandbox.reason.not-permitted": "blocked by the kernel (user namespaces are not permitted here)",
+    "sandbox.reason.timeout": "not responding",
+    "sandbox.reason.failed": "not working",
+    "sandbox.warnTitle": "No sandbox for Linux apps",
+    "sandbox.warnBody": "bubblewrap is {0}. Apps left on Automatic run as plain programs (None), while apps set to Relaxed or Isolated refuse to start instead of pretending the sandbox is there.",
+    "sandbox.dismiss": "Got it",
+    "sandbox.badgeNone": "No isolation",
+    "sandbox.badgeRelaxed": "Relaxed",
+    "sandbox.badgeIsolated": "Isolated",
+    "sandbox.badgeRequired": "Bwrap required",
+    "handoff.copying": "Copying into the app: {0}",
+    "handoff.copyNote": "{0} / {1} - the app works on a copy inside its own home folder (plwl-handoff); edits in the copy never come back.",
+    "handoff.failed": "Could not copy {0} into the app: {1}",
+    "sandbox.required": "This app needs a working bubblewrap sandbox: {0}",
+    "sandbox.linkOpener": "PLWL link opener",
     "config.save": "Save changes",
     "config.shortcut": "Create shortcut",
     "config.shortcutCreated": "Shortcut for {0} created (menu + desktop)",
@@ -136,6 +183,13 @@
     "prefixes.inUse": "Cannot change prefix {0} while an app from it is running: {1}. Close it first.",
     "prefixes.inUseHint": "An app is running from this prefix right now - close it before renaming.",
     "prefixes.hasApps": "Cannot delete prefix {0} - these apps still use it: {1}. Point them at another prefix or remove them first.",
+    "prefixes.resetConfig": "Reset Linux config",
+    "prefixes.resetConfigHint": "Deletes the desktop preferences (theme, GTK/Qt, PulseAudio and X11 cookies) PLWL copied from your system into this prefix. They are copied again on the next app start; app data stays.",
+    "prefixes.resetConfigConfirm": "Delete the desktop preferences copied into prefix {0}? The next app start copies them again from your system. App data is left untouched.",
+    "prefixes.resetConfigDone": "Linux config of prefix {0} reset - it is copied again from your system on the next app start.",
+    "prefixes.resetConfigNone": "Nothing to reset in prefix {0} - the desktop preferences are not copied in.",
+    "prefixes.resetConfigBusy": "Cannot reset the Linux config of prefix {0} while an app from it is running: {1}. Close it first.",
+    "prefixes.resetConfigFailed": "Could not reset the Linux config of prefix {0}.",
     "wines.title": "Wine versions",
     "wines.subtitle": "You can import your wine/proton builds here. Proton runs fully without Steam.",
     "wines.system": "System Wine",
@@ -201,17 +255,20 @@
     "lansync.prefixes": "Wine prefixes",
     "lansync.settings": "Sync settings (names, app configs and order)",
     "lansync.force": "Force sync all files (skip the hash check and overwrite everything)",
-    "lansync.mirrorWarning": "This device is the source of truth: on the other device, files and items that do not exist here will be deleted.",
+    "lansync.mirrorWarning": "The selected items will match this device exactly. Nothing outside the selection is deleted, and the deletion list is approved on the other device.",
-    "lansync.incomingMirror": "The other device is the source of truth: files and items on this device that do not exist there will be deleted.",
+    "lansync.incomingMirror": "The other device is the source of truth for the selected items. You will review the list of files to delete before the sync finishes.",
     "lansync.start": "Start sync",
     "lansync.progress": "Syncing to {0}…",
+    "lansync.waiting": "Waiting for the other device…",
     "lansync.phase.scan": "Preparing {0}",
     "lansync.phase.hash": "Hashing {0}",
+    "lansync.phase.compare": "Comparing {0}",
     "lansync.phase.plan": "Comparing {0}",
     "lansync.phase.copy": "Sending {0}",
     "lansync.recvPhase.copy": "Receiving {0}",
     "lansync.phase.registry": "Updating the library",
-    "lansync.phase.commit": "Removing extra files",
+    "lansync.phase.commit": "Checking for extra files",
+    "lansync.phase.review": "Waiting for the deletion approval",
     "lansync.phase.done": "Finishing up",
     "lansync.progressFiles": "{0} / {1} files",
     "lansync.progressBytes": "{0} / {1} transferred",
@@ -223,16 +280,42 @@
     "lansync.receiving": "Receiving from {0}…",
     "lansync.incomingTitle": "Incoming sync from {0}",
     "lansync.incomingText": "{0} wants to sync its apps, Wine versions and prefixes onto this device.",
+    "lansync.incomingSettings": "launcher settings only (no files)",
     "lansync.incomingNothing": "Nothing was selected, or the totals have not arrived yet.",
     "lansync.incomingTimedOut": "The incoming sync request timed out.",
     "lansync.accept": "Accept",
     "lansync.decline": "Decline",
     "lansync.rejected": "{0} declined the sync.",
     "lansync.unknownDevice": "Unknown device",
-    "lansync.recvWaiting": "Waiting for the file list…",
-    "lansync.recvStalled": "Waiting for the other device…",
     "lansync.recvIdle": "The other device stopped responding, the sync was interrupted.",
     "lansync.done": "Synced to {0}: {1} sent ({4}), {2} already up to date, {3} removed",
+    "lansync.summaryTitle": "Sync finished",
+    "lansync.summarySentTo": "Sent to {0}",
+    "lansync.summaryReceivedFrom": "Received from {0}",
+    "lansync.summaryApps": "Apps",
+    "lansync.summarySettings": "Settings",
+    "lansync.summarySent": "Files sent",
+    "lansync.summaryReceived": "Files received",
+    "lansync.summarySkipped": "Already up to date",
+    "lansync.summaryDeleted": "Removed",
+    "lansync.summaryTransferred": "Transferred",
+    "lansync.summarySize": "Synced data size",
+    "lansync.summaryKept": "Kept by the other device",
+    "lansync.pick": "Select",
+    "lansync.pickCount": "Select ({0}/{1})",
+    "lansync.pickSearch": "Search",
+    "lansync.pickAll": "Select all",
+    "lansync.pickNone": "Select none",
+    "lansync.prefixLeftBehind": "Prefix {0} is not selected — this app's folder will not travel.",
+    "lansync.reviewTitle": "Review deletions",
+    "lansync.reviewFrom": "Received from {0}. Review the list before anything is removed.",
+    "lansync.reviewText": "To delete: {0} files ({1}). Uncheck what should stay.",
+    "lansync.reviewOverwrite": "Files that exist on both sides are overwritten with the other device's version. If you play on both computers, leave this prefix out of the sync.",
+    "lansync.reviewKeepAll": "Keep everything",
+    "lansync.reviewDelete": "Delete {0} files ({1})",
+    "lansync.reviewDeleting": "Deleting…",
+    "lansync.reviewFiles": "{0} files · {1}",
+    "lansync.summaryYes": "yes",
     "lansync.failed": "Sync failed: {0}",
     "lansync.badCode": "Wrong sync code. Enter the code shown on the other device.",
     "lansync.busy": "The other device is busy (another sync or a running app).",
@@ -242,6 +325,8 @@
     "lansync.idRerolled": "New device ID generated",
     "lansync.codeRerolled": "New sync code generated",
     "lansync.unknownError": "unknown error",
+    "lansync.oldPeer": "The other device runs an older PLWL. Update it — without the deletion review this sync is not safe.",
+    "lansync.reviewExpired": "The deletion review expired and nothing was removed.",
     "openwith.title": "Open with Wine",
     "openwith.file": "File",
     "openwith.fileMissing": "This file no longer exists (or is not a Windows executable).",

files/translations/pl.json

@@ -34,8 +34,14 @@
     "library.removeConfirm": "Usunąć {0} z launchera?{1}",
     "library.removeFilesNote": "\nJej zaimportowane pliki w files/apps również zostaną usunięte.",
     "library.removePrefixNote": "\nPliki zostają w prefiksie, usuwany jest tylko wpis w launcherze.",
+    "library.removeLinuxDataNote": "\nJej pliki w files/apps zostaną usunięte; dane w prefiksie zostają.",
     "library.tools": "Narzędzia Wine",
     "library.reorderHint": "Przeciągnij, aby zmienić kolejność",
+    "import.kind.title": "Co importujesz?",
+    "import.kind.windows": "Aplikacja Windows (Wine / Proton)",
+    "import.kind.windowsHint": "Uruchamiana przez wine albo proton.",
+    "import.kind.linux": "Aplikacja Linux (natywna)",
+    "import.kind.linuxHint": "Uruchamiana bezpośrednio w systemie, z własnym odizolowanym folderem domowym. Wymaga binarki ELF, pliku .AppImage lub .desktop.",
     "import.question": "Czy pliki aplikacji mają trafić do launchera, aby był przenośny, czy mają zostać tam, gdzie są?",
     "import.mode.copy": "Skopiuj do launchera (przenośne)",
     "import.mode.move": "Przenieś do launchera (przenośne)",
@@ -58,9 +64,12 @@
     "import.done": "Import zakończony",
     "import.failed": "Import nie powiódł się: {0}",
     "import.noExe": "nie znaleziono pliku .exe w wybranym folderze",
+    "import.noLinuxExe": "nie znaleziono uruchamialnego programu linuksowego w wybranym folderze (binarka ELF, .AppImage lub .desktop)",
     "import.prefixRoot": "ten folder to prefiks wine (lub jego dysk C:) - zaimportuj aplikację z wnętrza jego drive_c",
+    "import.copyIncomplete": "nie udało się skopiować niektórych plików - nic nie zaimportowano, folder źródłowy pozostał bez zmian",
     "config.title": "Konfiguracja aplikacji",
     "config.icon.auto": "Wyciągnij z exe",
+    "config.icon.autoLinux": "Wyciągnij ikonę",
     "config.icon.browse": "Wybierz obrazek",
     "config.icon.remove": "Usuń ikonę",
     "config.icon.pick": "Wybierz obrazek ikony",
@@ -80,6 +89,23 @@
     "config.prefixDefault": "Prefiks domyślny ({0})",
     "config.prefixLocked": "Ta aplikacja została zaimportowana z prefiksu, nie można zmienić jej prefiksu",
     "config.prefixLockedHint": "Przypięta do prefiksu, z którego została zaimportowana (ścieżki trzymane są względem niego)",
+    "config.linuxDataRoot": "Folder danych (prefiks)",
+    "config.linuxDataRootHint": "Natywna aplikacja trzyma swój home, config i cache w linux_pfx w tym prefiksie.",
+    "config.openData": "Otwórz folder danych",
+    "config.linuxKindValue": "Linux",
+    "config.isolation": "Izolacja",
+    "config.isolation.auto": "Automatyczna",
+    "config.isolation.none": "None",
+    "config.isolation.relaxed": "Relaxed",
+    "config.isolation.isolated": "Isolated",
+    "config.isolationHint.auto": "Relaxed, gdy bubblewrap działa; na maszynie bez bwrap aplikacja uruchamia bez izolacji.",
+    "config.isolationHint.none": "Bez sandboxa: aplikacja widzi i może zmienić wszystko, do czego ma prawo Twój użytkownik.",
+    "config.isolationHint.relaxed": "Cały dysk podmontowany zapisywalnie jako /tmp/plwl-fs-root.",
+    "config.isolationHint.isolated": "System tylko do odczytu.",
+    "config.isolation.bwrap": "bwrap {0} (dostępny)",
+    "config.isolation.env": "brak sandboxa: {0}",
+    "config.forceX11": "Wymuś X11 (XWayland)",
+    "config.forceX11Hint": "Uruchamia aplikację przez XWayland zamiast Waylanda. Przydatne, gdy okno nie potrafi mieć własnej ikony albo źle działa na Waylandzie.",
     "config.disableUmu": "Wyłącz UMU (uruchamiaj bezpośrednio wine)",
     "config.disableUmuHint": "Uruchamia grę bezpośrednio binarką wine z builda, z pominięciem launchera umu.exe/steam.exe. To najbliżej zwykłego uruchomienia wine.",
     "config.dllOverrides": "Nadpisania DLL",
@@ -88,6 +114,27 @@
     "config.overrides.setting": "Ustawienie",
     "config.overrides.remove": "Usuń",
     "config.overrides.hint": "Nazwy modułów Wine, np. dinput8. native,builtin (domyślne) wczytuje DLL dołączony do gry, a gdy go nie ma — wbudowany Wine; disabled blokuje moduł.",
+    "sandbox.title": "Izolacja aplikacji Linux",
+    "sandbox.hint": "Natywne aplikacje zawsze działają z przekierowanym folderem domowym - ich config i cache zostają w prefiksie. Poziom izolacji mówi, co jeszcze dostają: None to brak sandboxa, Relaxed daje cały dysk zapisywalny, a Isolated nie pozwala zapisać niczego poza folderem aplikacji i kopiuje otwierane pliki do jej folderu domowego.",
+    "sandbox.status": "Status",
+    "sandbox.check": "Sprawdź ponownie",
+    "sandbox.rechecked": "Sprawdzono izolację ponownie",
+    "sandbox.reason.missing": "nie jest zainstalowany",
+    "sandbox.reason.not-permitted": "blokowany przez jądro (brak zgody na user namespaces)",
+    "sandbox.reason.timeout": "nie odpowiada",
+    "sandbox.reason.failed": "nie działa",
+    "sandbox.warnTitle": "Brak sandboxa dla aplikacji Linux",
+    "sandbox.warnBody": "bubblewrap {0}. Aplikacje ustawione na Automatyczną uruchomią się jak zwykłe programy (None), a te ustawione jawnie na Relaxed albo Isolated odmówią startu, zamiast udawać, że sandbox działa.",
+    "sandbox.dismiss": "Rozumiem",
+    "sandbox.badgeNone": "Bez izolacji",
+    "sandbox.badgeRelaxed": "Relaxed",
+    "sandbox.badgeIsolated": "Isolated",
+    "sandbox.badgeRequired": "Wymaga bwrap",
+    "handoff.copying": "Kopiowanie do aplikacji: {0}",
+    "handoff.copyNote": "{0} / {1} - aplikacja pracuje na kopii w swoim folderze domowym (plwl-handoff); zmiany w kopii nie wracają do oryginału.",
+    "handoff.failed": "Nie udało się skopiować {0} do aplikacji: {1}",
+    "sandbox.required": "Ta aplikacja wymaga działającego sandboxa bubblewrap: {0}",
+    "sandbox.linkOpener": "PLWL - otwieranie linków",
     "config.save": "Zapisz zmiany",
     "config.shortcut": "Utwórz skrót",
     "config.shortcutCreated": "Skrót dla {0} utworzony (menu + pulpit)",
@@ -136,6 +183,13 @@
     "prefixes.inUse": "Nie można zmienić prefiksu {0}, gdy działa z niego aplikacja: {1}. Najpierw ją zamknij.",
     "prefixes.inUseHint": "Właśnie działa aplikacja z tego prefiksu - zamknij ją przed zmianą nazwy.",
     "prefixes.hasApps": "Nie można usunąć prefiksu {0} - używają go jeszcze aplikacje: {1}. Wskaż im inny prefiks albo usuń je najpierw.",
+    "prefixes.resetConfig": "Resetuj config Linuksa",
+    "prefixes.resetConfigHint": "Usuwa preferencje pulpitu (motyw, GTK/Qt, ciasteczka PulseAudio i X11) skopiowane z systemu do tego prefiksu. Przy następnym starcie apki zostaną skopiowane od nowa; dane aplikacji zostają.",
+    "prefixes.resetConfigConfirm": "Usunąć preferencje pulpitu skopiowane do prefiksu {0}? Przy następnym starcie apki zostaną skopiowane od nowa z systemu. Dane aplikacji pozostaną nietknięte.",
+    "prefixes.resetConfigDone": "Zresetowano config Linuksa prefiksu {0} - przy następnym starcie apki zostanie skopiowany od nowa z systemu.",
+    "prefixes.resetConfigNone": "W prefiksie {0} nie ma nic do zresetowania - preferencje pulpitu nie są tam skopiowane.",
+    "prefixes.resetConfigBusy": "Nie można zresetować configu Linuksa prefiksu {0}, gdy działa z niego aplikacja: {1}. Najpierw ją zamknij.",
+    "prefixes.resetConfigFailed": "Nie udało się zresetować configu Linuksa prefiksu {0}.",
     "wines.title": "Wersje Wine",
     "wines.subtitle": "Tutaj możesz zaimportować swoje buildy wine/proton. Proton działa w pełni bez Steama.",
     "wines.system": "Wine systemowe",
@@ -201,17 +255,20 @@
     "lansync.prefixes": "Prefiksy Wine",
     "lansync.settings": "Ustawienia (nazwy, konfiguracje i kolejność aplikacji)",
     "lansync.force": "Wymuś synchronizację wszystkich plików (pomiń sprawdzanie hashy i nadpisz wszystko)",
-    "lansync.mirrorWarning": "To urządzenie jest źródłem prawdy: na drugim urządzeniu pliki i elementy, których tu nie ma, zostaną usunięte.",
+    "lansync.mirrorWarning": "Zaznaczone elementy będą na drugim urządzeniu dokładnie takie jak tutaj. Niczego poza wyborem nie usuwamy, a listę usunięć zatwierdzisz na drugim urządzeniu.",
-    "lansync.incomingMirror": "Drugie urządzenie jest źródłem prawdy: pliki i elementy na tym urządzeniu, których tam nie ma, zostaną usunięte.",
+    "lansync.incomingMirror": "Drugie urządzenie jest źródłem prawdy dla zaznaczonych elementów. Listę plików do usunięcia zatwierdzisz przed końcem synchronizacji.",
     "lansync.start": "Rozpocznij synchronizację",
     "lansync.progress": "Synchronizowanie na {0}…",
+    "lansync.waiting": "Oczekiwanie na drugie urządzenie…",
     "lansync.phase.scan": "Przygotowywanie {0}",
     "lansync.phase.hash": "Haszowanie {0}",
+    "lansync.phase.compare": "Porównywanie {0}",
     "lansync.phase.plan": "Porównywanie {0}",
     "lansync.phase.copy": "Wysyłanie {0}",
     "lansync.recvPhase.copy": "Odbieranie {0}",
     "lansync.phase.registry": "Aktualizowanie biblioteki",
-    "lansync.phase.commit": "Usuwanie zbędnych plików",
+    "lansync.phase.commit": "Sprawdzanie zbędnych plików",
+    "lansync.phase.review": "Czekanie na potwierdzenie usunięć",
     "lansync.phase.done": "Kończenie",
     "lansync.progressFiles": "{0} / {1} plików",
     "lansync.progressBytes": "{0} / {1} przesłane",
@@ -223,16 +280,42 @@
     "lansync.receiving": "Odbieranie od {0}…",
     "lansync.incomingTitle": "Przychodząca synchronizacja od {0}",
     "lansync.incomingText": "{0} chce przysłać swoje aplikacje, wersje Wine i prefiksy na to urządzenie.",
+    "lansync.incomingSettings": "tylko ustawienia launchera (bez plików)",
     "lansync.incomingNothing": "Nic nie zaznaczono albo podsumowanie jeszcze nie dotarło.",
     "lansync.incomingTimedOut": "Upłynął czas na odpowiedź na przychodzącą synchronizację.",
     "lansync.accept": "Akceptuj",
     "lansync.decline": "Odrzuć",
     "lansync.rejected": "{0} odrzucił synchronizację.",
     "lansync.unknownDevice": "Nieznane urządzenie",
-    "lansync.recvWaiting": "Oczekiwanie na listę plików…",
-    "lansync.recvStalled": "Oczekiwanie na drugie urządzenie…",
     "lansync.recvIdle": "Drugie urządzenie przestało odpowiadać, synchronizacja została przerwana.",
     "lansync.done": "Zsynchronizowano na {0}: wysłano {1} ({4}), aktualnych {2}, usunięto {3}",
+    "lansync.summaryTitle": "Synchronizacja zakończona",
+    "lansync.summarySentTo": "Wysłano do {0}",
+    "lansync.summaryReceivedFrom": "Odebrano od {0}",
+    "lansync.summaryApps": "Aplikacje",
+    "lansync.summarySettings": "Ustawienia",
+    "lansync.summarySent": "Wysłane pliki",
+    "lansync.summaryReceived": "Odebrane pliki",
+    "lansync.summarySkipped": "Niezmienione pliki",
+    "lansync.summaryDeleted": "Usunięte",
+    "lansync.summaryTransferred": "Przesłano",
+    "lansync.summarySize": "Rozmiar zsynchronizowanych danych",
+    "lansync.summaryKept": "Zachowane przez drugie urządzenie",
+    "lansync.pick": "Wybierz",
+    "lansync.pickCount": "Wybierz ({0}/{1})",
+    "lansync.pickSearch": "Szukaj",
+    "lansync.pickAll": "Zaznacz wszystko",
+    "lansync.pickNone": "Odznacz wszystko",
+    "lansync.prefixLeftBehind": "Prefiks {0} nie jest zaznaczony — folder tej aplikacji nie zostanie przesłany.",
+    "lansync.reviewTitle": "Przegląd usunięć",
+    "lansync.reviewFrom": "Odebrano od {0}. Przed usunięciem przejrzyj listę.",
+    "lansync.reviewText": "Do usunięcia: {0} plików ({1}). Odznacz to, co ma zostać.",
+    "lansync.reviewOverwrite": "Pliki istniejące po obu stronach zostaną nadpisane wersją z drugiego urządzenia. Jeśli grasz na obu komputerach, wyłącz ten prefiks z synchronizacji.",
+    "lansync.reviewKeepAll": "Zachowaj wszystko",
+    "lansync.reviewDelete": "Usuń {0} plików ({1})",
+    "lansync.reviewDeleting": "Usuwanie…",
+    "lansync.reviewFiles": "{0} plików · {1}",
+    "lansync.summaryYes": "tak",
     "lansync.failed": "Synchronizacja nie powiodła się: {0}",
     "lansync.badCode": "Błędny kod synchronizacji. Wpisz kod pokazany na drugim urządzeniu.",
     "lansync.busy": "Drugie urządzenie jest zajęte (inna synchronizacja lub uruchomiona aplikacja).",
@@ -242,6 +325,8 @@
     "lansync.idRerolled": "Wygenerowano nowe ID urządzenia",
     "lansync.codeRerolled": "Wygenerowano nowy kod synchronizacji",
     "lansync.unknownError": "nieznany błąd",
+    "lansync.oldPeer": "Drugie urządzenie ma starszą wersję PLWL. Zaktualizuj je — bez przeglądu usunięć ta synchronizacja nie jest bezpieczna.",
+    "lansync.reviewExpired": "Przegląd usunięć wygasł i nic nie zostało usunięte.",
     "openwith.title": "Otwórz przez Wine",
     "openwith.file": "Plik",
     "openwith.fileMissing": "Ten plik już nie istnieje (albo nie jest plikiem wykonywalnym Windows).",

package.json

@@ -1,7 +1,7 @@
 {
   "name": "PLWL",
   "productName": "PLWL",
-  "version": "0.4.2",
+  "version": "0.5.4",
   "description": "Portable Linux Wine Launcher",
   "main": "src/main.js",
   "scripts": {

renderer/index.html

@@ -110,6 +110,15 @@
             <button class="button danger" id="btn-clear-hash-cache" data-t="settings.clearHashCache"></button>
           </div>
         </div>
+        <div class="form-card">
+          <h2 data-t="sandbox.title"></h2>
+          <p class="subtitle" data-t="sandbox.hint"></p>
+          <label class="field-label" data-t="sandbox.status"></label>
+          <p class="subtitle" id="set-sandbox-status"></p>
+          <div class="form-actions">
+            <button class="button" id="btn-sandbox-check" data-t="sandbox.check"></button>
+          </div>
+        </div>
       </section>
 
       <section id="view-lansync" class="view">
@@ -180,26 +189,48 @@
           <label class="field-label" data-t="config.args"></label>
           <input type="text" id="gc-args" data-ph="config.argsHint">
 
+          <div class="win-only">
             <label class="field-label" data-t="config.wine"></label>
             <span id="gc-wine"></span>
+          </div>
 
-          <label class="field-label" data-t="config.prefix"></label>
+          <label class="field-label win-only" data-t="config.prefix"></label>
+          <label class="field-label linux-only" data-t="config.linuxDataRoot" style="display:none"></label>
           <span id="gc-prefix"></span>
-          <p class="subtitle" id="gc-prefix-lock-hint" data-t="config.prefixLockedHint" style="display:none"></p>
+          <p class="subtitle win-only" id="gc-prefix-lock-hint" data-t="config.prefixLockedHint" style="display:none"></p>
+          <p class="subtitle linux-only" data-t="config.linuxDataRootHint" style="display:none"></p>
+          <div class="linux-only" style="display:none">
+            <button class="button" id="btn-gc-data-folder" data-t="config.openData"></button>
+          </div>
 
+          <div class="linux-only" style="display:none">
+            <label class="field-label" data-t="config.isolation"></label>
+            <span id="gc-isolation"></span>
+            <p class="subtitle" id="gc-isolation-hint"></p>
+            <p class="subtitle" id="gc-isolation-status"></p>
+
+            <label class="check-label">
+              <input type="checkbox" id="gc-force-x11">
+              <span data-t="config.forceX11"></span>
+            </label>
+            <p class="subtitle" data-t="config.forceX11Hint"></p>
+          </div>
+
+          <label class="field-label" data-t="config.env"></label>
+          <textarea id="gc-env" rows="3" data-ph="config.envHint"></textarea>
+
+          <div class="win-only">
             <label class="check-label">
               <input type="checkbox" id="gc-disable-umu">
               <span data-t="config.disableUmu"></span>
             </label>
             <p class="subtitle" data-t="config.disableUmuHint"></p>
 
-          <label class="field-label" data-t="config.env"></label>
-          <textarea id="gc-env" rows="3" data-ph="config.envHint"></textarea>
-
             <label class="field-label" data-t="config.dllOverrides"></label>
             <div id="gc-overrides" class="overrides"></div>
             <button class="button" id="gc-override-add" data-t="config.overrides.add"></button>
             <p class="subtitle" data-t="config.overrides.hint"></p>
+          </div>
 
           <div class="form-actions">
             <button class="button danger" id="btn-gc-clear-playtime" data-t="config.clearPlaytime"></button>
@@ -208,7 +239,7 @@
             <button class="button primary" id="btn-gc-save" data-t="config.save"></button>
           </div>
         </div>
-        <div class="form-card">
+        <div class="form-card win-only">
           <h2 data-t="tools.title"></h2>
           <p class="subtitle" data-t="tools.subtitle"></p>
           <div class="tools-grid" id="gc-tools"></div>

renderer/style.css

@@ -7,7 +7,7 @@
   src: url('Nunito-Black.ttf') format('truetype');
 }
 
-* {
+*:not(svg *) {
   transform: translateZ(0);
 }
 
@@ -195,6 +195,68 @@ content {
    user has to notice, so it stands out from the subtitles around it. */
 .sync-warning { color: var(--big-red); margin-top: 0.6rem; }
 
+/* End-of-sync summary: label left, count/size right, one row per fact. */
+.sync-summary { display: flex; flex-direction: column; }
+.sync-summary-row {
+  display: flex;
+  align-items: baseline;
+  justify-content: space-between;
+  gap: 1rem;
+  padding: 0.45rem 0;
+  border-bottom: var(--border-width) solid var(--light-border-color);
+}
+.sync-summary-row:last-child { border-bottom: none; padding-bottom: 0; }
+.sync-summary-row span { color: var(--darker-text-color); }
+.sync-summary-row strong { font-weight: 700; font-variant-numeric: tabular-nums; }
+
+/* --- LAN sync: per-category item pickers ---------------------------------- */
+.lan-cat { display: flex; flex-direction: column; }
+.lan-cat-head { display: flex; align-items: center; gap: 0.6rem; }
+.lan-cat-head .check-label { flex: 1; min-width: 0; margin: 0.35rem 0; }
+.lan-pick {
+  display: flex;
+  flex-direction: column;
+  gap: 0.4rem;
+  margin: 0 0 0.5rem 2.4rem;
+  padding: 0.5rem 0.6rem;
+  border-radius: 0.5rem;
+  background-color: rgba(255, 255, 255, 0.045);
+}
+.lan-pick[hidden] { display: none; }
+.lan-pick-tools { display: flex; align-items: center; gap: 0.4rem; }
+.lan-search { flex: 1; min-width: 0; height: 2.2rem; min-height: 0; }
+.lan-pick-list { display: flex; flex-direction: column; max-height: 16rem; overflow-y: auto; }
+.lan-pick-list .check-label { margin: 0.15rem 0; }
+.lan-pick-list .lan-hint { margin: 0 0 0.3rem 2.4rem; font-size: 0.85em; }
+.lan-item span { overflow-wrap: anywhere; }
+
+/* --- LAN sync: the deletion review ---------------------------------------- */
+.lan-review { display: flex; flex-direction: column; max-height: 46vh; overflow-y: auto; padding-right: 0.3rem; }
+.lan-review-unit {
+  display: flex;
+  align-items: center;
+  gap: 0.6rem;
+  margin-top: 0.7rem;
+  padding-top: 0.35rem;
+  border-top: 1px solid rgba(255, 255, 255, 0.07);
+}
+.lan-review-unit .check-label { flex: 1; min-width: 0; margin: 0; }
+.lan-review-unit .lan-review-name { font-weight: 700; overflow-wrap: anywhere; }
+.lan-review-meta, .lan-node-meta {
+  color: var(--darker-text-color);
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+  font-size: 0.85em;
+}
+.lan-nodes { display: flex; flex-direction: column; }
+.lan-nodes[hidden] { display: none; }
+.lan-node { display: flex; align-items: center; gap: 0.5rem; padding: 0.12rem 0.2rem; }
+.lan-node .check-label { flex: 1; min-width: 0; margin: 0; gap: 0.5rem; }
+.lan-node .lan-node-name { overflow-wrap: anywhere; }
+.lan-node input[type='checkbox'] { width: 1.4rem; height: 1.4rem; }
+.lan-node-open { padding: 0 0.5rem; min-height: 1.6rem; }
+.lan-review-actions { display: flex; gap: 0.6rem; justify-content: flex-end; margin-top: 0.6rem; }
+
 .button {
   height: var(--button-height);
   padding: 0 1rem;
@@ -358,6 +420,15 @@ select {
   z-index: 50;
   transform: none;
 }
+/* the blanket "transform: translateZ(0)" above makes every element its own
+   stacking context, which traps the open list inside its wrapper (a select in
+   a .linux-only or .form-card row painted under the next label); app.js adds
+   this class to the ancestors while a select is open so the whole chain lifts
+   over the rows below, then removes it again */
+.select-lift {
+  position: relative;
+  z-index: 50;
+}
 .custom-select-options {
   position: absolute;
   top: calc(100% + 0.4rem);
@@ -688,6 +759,7 @@ select {
   from { opacity: 0; }
   to { opacity: 1; }
 }
+.modal.wide { max-width: 44rem; }
 .modal h2 {
   font-family: 'Nunito Black', 'Nunito', sans-serif;
   font-size: 1.2rem;

src/fsutil.js

@@ -56,6 +56,10 @@ function progressGate(emit) {
   return push
 }
 
+// Tree walks are dominated by per-file syscalls; a handful in flight keeps a
+// slow disk busy without flooding the event loop with thousands of them.
+const TREE_CONCURRENCY = 16
+
 // Run `fn` over `items` with at most `limit` in flight, results in order.
 async function mapLimit(items, limit, fn) {
   const out = new Array(items.length)
@@ -90,7 +94,7 @@ async function treeSize(root) {
     } catch {
       return
     }
-    for (const entry of entries) {
+    await mapLimit(entries, TREE_CONCURRENCY, async entry => {
       const full = path.join(dir, entry.name)
       if (entry.isSymbolicLink()) {
         files++
@@ -102,7 +106,7 @@ async function treeSize(root) {
           bytes += (await fsp.stat(full)).size
         } catch {}
       }
-    }
+    })
   }
   await walk(root)
   return { files, bytes }
@@ -110,9 +114,12 @@ async function treeSize(root) {
 
 // Copy a tree with symlinks recreated and permissions carried (copyFile
 // drops both); reports cumulative { done, bytes } through onProgress.
+// `failed` counts entries that could not be recreated: a caller that needs a
+// complete copy (an import) must not treat a partial tree as success.
 async function copyTree(src, dst, onProgress) {
   let done = 0
   let bytes = 0
+  let failed = 0
   const gate = onProgress ? progressGate(onProgress) : null
   const tick = () => {
     if (gate) gate({ done, bytes }, false)
@@ -122,10 +129,16 @@ async function copyTree(src, dst, onProgress) {
     try {
       entries = await fsp.readdir(from, { withFileTypes: true })
     } catch {
+      failed++
       return
     }
+    try {
       await fsp.mkdir(to, { recursive: true })
-    for (const entry of entries) {
+    } catch {
+      failed++
+      return
+    }
+    await mapLimit(entries, TREE_CONCURRENCY, async entry => {
       const s = path.join(from, entry.name)
       const d = path.join(to, entry.name)
       if (entry.isSymbolicLink()) {
@@ -133,32 +146,127 @@ async function copyTree(src, dst, onProgress) {
         try {
           target = await fsp.readlink(s)
         } catch {}
-        if (!target) continue
+        if (!target) {
+          failed++
+          return
+        }
         try {
           await fsp.symlink(target, d)
-        } catch {}
+        } catch {
+          failed++
+        }
         done++
         tick()
       } else if (entry.isDirectory()) {
         await walk(s, d)
       } else if (entry.isFile()) {
-        let size = 0
+        let st = null
         try {
-          size = (await fsp.stat(s)).size
+          st = await fsp.stat(s)
         } catch {}
+        if (!st) {
+          failed++
+          return
+        }
         try {
           await fsp.copyFile(s, d)
-          await fsp.chmod(d, (await fsp.stat(s)).mode & 0o777)
+        } catch {
+          failed++
+          return
+        }
+        try {
+          await fsp.chmod(d, st.mode & 0o777)
         } catch {}
         done++
-        bytes += size
+        bytes += st.size
         tick()
       }
-    }
+    })
   }
   await walk(src, dst)
   if (gate) gate({ done, bytes }, true)
-  return { done, bytes }
+  return { done, bytes, failed }
+}
+
+// Imported trees come from media that lose permissions (archives, FAT, a
+// read-only backup drive), and copyFile keeps whatever the source had: every
+// node gets owner rwx and `x` mirrored from `r`, so the app can run its own
+// binaries and write its own files.
+async function chmodTree(root) {
+  const desired = mode => mode | 0o700 | ((mode & 0o444) >> 2)
+  let files = 0
+  let dirs = 0
+  const walk = async dir => {
+    let entries
+    try {
+      entries = await fsp.readdir(dir, { withFileTypes: true })
+    } catch {
+      return
+    }
+    await mapLimit(entries, TREE_CONCURRENCY, async entry => {
+      const full = path.join(dir, entry.name)
+      if (entry.isSymbolicLink()) return
+      if (entry.isDirectory()) {
+        await walk(full)
+      } else if (!entry.isFile()) {
+        return
+      }
+      try {
+        const before = (await fsp.stat(full)).mode & 0o7777
+        const after = desired(before)
+        if (after !== before) {
+          await fsp.chmod(full, after)
+          if (entry.isDirectory()) dirs++
+          else files++
+        }
+      } catch {}
+    })
+  }
+  await walk(root)
+  return { files, dirs }
+}
+
+// One file, streamed, with byte progress: copyFile says nothing until a
+// multi-gigabyte copy is over. The bytes land on a .part name and are renamed
+// at the end, so nothing can ever read a half-written document.
+async function copyFileProgress(src, dst, onProgress) {
+  const stat = await fsp.stat(src)
+  if (!stat.isFile()) throw new Error('not a file: ' + src)
+  const gate = onProgress ? progressGate(onProgress) : null
+  await fsp.mkdir(path.dirname(dst), { recursive: true })
+  const part = dst + '.part'
+  let bytes = 0
+  try {
+    await new Promise((resolve, reject) => {
+      const input = fs.createReadStream(src)
+      const output = fs.createWriteStream(part)
+      const fail = err => {
+        input.destroy()
+        output.destroy()
+        reject(err)
+      }
+      input.on('error', fail)
+      output.on('error', fail)
+      input.on('data', chunk => {
+        bytes += chunk.length
+        if (gate) gate({ done: 0, bytes }, false)
+      })
+      output.on('finish', resolve)
+      input.pipe(output)
+    })
+    await fsp.chmod(part, stat.mode & 0o777)
+    await fsp.rename(part, dst)
+  } catch (err) {
+    try {
+      await fsp.rm(part, { force: true })
+    } catch {}
+    throw err
+  }
+  if (gate) {
+    gate({ done: 1, bytes: stat.size }, true)
+    gate.done()
+  }
+  return { files: 1, bytes: stat.size }
 }
 
 // Delete deepest-first with progress through onProgress; symlinks are
@@ -194,7 +302,7 @@ async function removeTree(root, onProgress) {
     } catch {
       return false
     }
-    for (const entry of entries) {
+    await mapLimit(entries, TREE_CONCURRENCY, async entry => {
       const full = path.join(dir, entry.name)
       if (entry.isDirectory()) {
         await walk(full)
@@ -203,7 +311,7 @@ async function removeTree(root, onProgress) {
         } catch {}
         dirs++
         tick()
-        continue
+        return
       }
       let size = 0
       try {
@@ -216,7 +324,7 @@ async function removeTree(root, onProgress) {
       files++
       bytes += size
       tick()
-    }
+    })
     try {
       await fsp.rmdir(dir)
       dirs++
@@ -228,5 +336,5 @@ async function removeTree(root, onProgress) {
   return { files, dirs, bytes }
 }
 
-module.exports = { pathExists, dedupeDir, copyTree, treeSize, removeTree, progressGate, mapLimit }
+module.exports = { pathExists, dedupeDir, copyTree, copyFileProgress, treeSize, removeTree, chmodTree, progressGate, mapLimit }
 

src/hashcache.js

@@ -42,7 +42,6 @@ function createHashCache(dataDir) {
   let cache = null
   let dirty = false
   let savedAt = 0
-  const stats = { hits: 0, misses: 0 }
 
   function load() {
     if (cache) return cache
@@ -80,11 +79,7 @@ function createHashCache(dataDir) {
   // the cache dirty only when the timestamp is stale.
   function hit(rel, size, mtimeMs) {
     const known = load()[rel]
-    if (!known || known[0] !== size || known[1] !== mtimeMs || typeof known[2] !== 'string') {
+    if (!known || known[0] !== size || known[1] !== mtimeMs || typeof known[2] !== 'string') return null
-      stats.misses++
-      return null
-    }
-    stats.hits++
     if (Date.now() - (known[3] || 0) > 86400000) {
       known[3] = Date.now()
       dirty = true
@@ -111,35 +106,13 @@ function createHashCache(dataDir) {
     cache = null
     dirty = false
     savedAt = 0
-    stats.hits = 0
-    stats.misses = 0
     try {
       fs.rmSync(FILE, { force: true })
       fs.rmSync(`${FILE}.tmp`, { force: true })
     } catch {}
   }
 
-  // Dropping the memory copy makes the next lookup re-read from disk (tests).
+  return { HASH_ALGO, hashFile, hit, remember, cachedHash, save, clear }
-  function forget() {
-    cache = null
-    dirty = false
-  }
-
-  return {
-    HASH_ALGO,
-    hashFile,
-    hit,
-    remember,
-    cachedHash,
-    save,
-    clear,
-    forget,
-    stats: () => ({ ...stats, size: cache ? Object.keys(cache).length : 0, algo: HASH_ALGO }),
-    resetStats: () => {
-      stats.hits = 0
-      stats.misses = 0
-    }
-  }
 }
 
 module.exports = { createHashCache, hashFile, HASH_ALGO }

src/icons.js

@@ -2,6 +2,7 @@
 
 const fs = require('fs')
 const path = require('path')
+const { desktopFileFor, readDesktopEntry, findIconFile, pngOrSvg } = require('./linuxapp')
 
 function rvaToOffset(sections, rva) {
   for (const s of sections) {
@@ -169,7 +170,7 @@ function buildIco(images) {
         planes = dims.planes
         bpp = dims.bpp
       } else {
-        // legacy fallback: ICONDIRENTRY-style first bytes (PNG-era heuristic)
+        // nothing measurable: the first bytes carry the size
         w = img.readUInt8(0) || 256
         h = img.readUInt8(1) || 256
         colors = img.readUInt8(2)
@@ -208,4 +209,35 @@ function extractIconFromExe(exePath, outPath) {
   }
 }
 
-module.exports = { extractIconFromExe, parseIcons, buildIco }
+// Native Linux apps carry no icon inside the binary: it comes from the
+// .desktop entry (Icon=), an image next to the program, or the theme.
+// `outBase` is a path without extension; the sniffed one is appended.
+function iconFromLinuxApp(exePath, outBase) {
+  try {
+    const desktop = desktopFileFor(exePath)
+    const entry = desktop ? readDesktopEntry(desktop) : null
+    const baseDir = desktop ? path.dirname(desktop) : path.dirname(exePath)
+    let source = findIconFile(entry && entry.Icon, baseDir)
+    if (!source) {
+      // no .desktop: a same-named image (or the AppImage .DirIcon) next to it
+      const dir = path.dirname(exePath)
+      const stem = path.basename(exePath).replace(/\.(appimage|sh|bin)$/i, '')
+      for (const name of [stem + '.png', stem + '.svg', '.DirIcon', 'icon.png', 'icon.svg']) {
+        const candidate = path.join(dir, name)
+        if (pngOrSvg(candidate)) {
+          source = candidate
+          break
+        }
+      }
+    }
+    if (!source) return { ok: false, error: 'no-icon' }
+    const outPath = `${outBase}.${pngOrSvg(source)}`
+    fs.mkdirSync(path.dirname(outPath), { recursive: true })
+    fs.copyFileSync(source, outPath)
+    return { ok: true, path: outPath }
+  } catch (err) {
+    return { ok: false, error: String((err && err.message) || err) }
+  }
+}
+
+module.exports = { extractIconFromExe, iconFromLinuxApp, parseIcons, buildIco }

src/importer.js

@@ -5,29 +5,44 @@ const fsp = fs.promises
 const path = require('path')
 const { DIRS, resolvePortablePath } = require('./paths')
 const { newGame, newGameId, addGame } = require('./library')
-const { extractIconFromExe } = require('./icons')
+const { extractIconFromExe, iconFromLinuxApp } = require('./icons')
+const { findLinuxExe } = require('./linuxapp')
 const { listPrefixes, prefixDriveRoots, isPrefixRoot } = require('./prefixes')
 const { rewireSymlinks } = require('./symlinks')
-const { copyTree, treeSize } = require('./fsutil')
+const { copyTree, treeSize, chmodTree } = require('./fsutil')
 
 // Directories that typically hold installers/redistributables, not the game.
 const SKIPPED_DIRS = new Set(['redist', 'directx', '_commonredist', 'support', 'dotnet', 'vc'])
 
+// A copy that lost files is not an import: drop the partial tree and say so.
+async function copyComplete(src, dst, onProgress) {
+  const res = await copyTree(src, dst, onProgress)
+  if (!res.failed) return res
+  await fsp.rm(dst, { recursive: true, force: true })
+  throw new Error('copy-incomplete')
+}
+
 // The copy itself lives in fsutil.copyTree; moveFolder falls back to it
 // across filesystems only.
 function moveFolder(src, dst, onProgress) {
-  const fallback = () => copyTree(src, dst, onProgress).then(() => fsp.rm(src, { recursive: true, force: true }))
+  const fallback = async () => {
+    await copyComplete(src, dst, onProgress)
+    await fsp.rm(src, { recursive: true, force: true })
+  }
   if (path.parse(src).root !== path.parse(dst).root) return fallback()
   return fsp.rename(src, dst).catch(fallback)
 }
 
-async function importGame(srcDir, mode, onProgress) {
+async function importGame(srcDir, mode, onProgress, kind = 'windows') {
+  const isLinux = kind === 'linux'
   // a prefix (or its drive_c/pfx) is not an app folder
   if (isPrefixRoot(srcDir)) return { ok: false, error: 'prefix-root' }
   const name = path.basename(srcDir)
-  // validate before touching anything: no .exe -> refuse
+  const finder = isLinux ? findLinuxExe : findDefaultExe
-  const preExe = await findDefaultExe(srcDir)
+  const missing = isLinux ? 'no-linux-exe' : 'no-exe-found'
-  if (!preExe) return { ok: false, error: 'no-exe-found' }
+  // validate before touching anything: no entry point -> refuse
+  const preExe = await finder(srcDir)
+  if (!preExe) return { ok: false, error: missing }
   // the id doubles as the imported folder name
   const id = newGameId()
   let workdir = srcDir
@@ -40,24 +55,30 @@ async function importGame(srcDir, mode, onProgress) {
       }
       emit('count', { files: 0, bytes: 0 })
       const total = await treeSize(srcDir)
-      await copyTree(srcDir, dst, p => emit('copy', { files: p.done, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+      await copyComplete(srcDir, dst, p => emit('copy', { files: p.done, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
     } else await moveFolder(srcDir, dst, onProgress)
     workdir = dst
+    // the source's permissions are not the source's truth: an app out of a
+    // read-only or mode-less medium has to become runnable and writable
+    await chmodTree(dst)
     // in-data link targets become relative, so the import survives a move
     try {
       await rewireSymlinks(dst, [DIRS.FILES])
     } catch {}
   }
-  const exePath = (await findDefaultExe(workdir)) || preExe
+  const exePath = (await finder(workdir)) || preExe
   if (!exePath) {
-    return { ok: false, error: 'no-exe-found' }
+    return { ok: false, error: missing }
   }
-  const game = newGame({ id, name, exePath, workdir, mode })
+  const game = newGame({ id, name, exePath, workdir, mode, kind })
   game.imported = mode === 'copy' || mode === 'move'
   // auto-picked exe -> grab its icon; a missing icon is not a failure
-  const icon = path.join(DIRS.DATA, 'icons', id, 'icon.ico')
+  const iconDir = path.join(DIRS.DATA, 'icons', id)
-  if (extractIconFromExe(resolvePortablePath(exePath), icon).ok) {
+  const icon = isLinux
-    game.iconSource = icon
+    ? iconFromLinuxApp(resolvePortablePath(exePath), path.join(iconDir, 'icon'))
+    : extractIconFromExe(resolvePortablePath(exePath), path.join(iconDir, 'icon.ico'))
+  if (icon.ok) {
+    game.iconSource = icon.path
   }
   return addGame(game)
 }
@@ -140,4 +161,4 @@ async function findDefaultExe(dir) {
   return best
 }
 
-module.exports = { importGame, importGameFromPrefix, findDefaultExe, moveFolder }
+module.exports = { importGame, importGameFromPrefix, findDefaultExe, findLinuxExe, moveFolder, copyComplete }

src/ipc/games.js

@@ -1,7 +1,9 @@
 'use strict'
 
 const { runGame, runTool } = require('../runner')
+const { runLinuxGame } = require('../linuxrunner')
 const { importGame, importGameFromPrefix } = require('../importer')
+const { prefixLinuxRoot } = require('../prefixes')
 const library = require('../library')
 
 function killProcessGroup(pid) {
@@ -20,11 +22,9 @@ function sendToWindow(win, channel, data) {
 // Game-process state: id -> { pid, resolved prefix name and wine id }, frozen
 // at launch (the in-use guards must name what the process really locked).
 // onGamesChanged fires in the main process when the running set changes.
-const STARTUP_GRACE_MS = 60000
+function createGamesService({ getWindow, onGamesChanged, sandbox, onHandoffProgress, openRelay }) {
-
-function createGamesService({ getWindow, onGamesChanged }) {
   const running = new Map()
-  const startedAt = new Map()
+  const starting = new Set()
   const killRequests = new Set()
   let onGameExit = null
   const notifyChanged = () => {
@@ -41,14 +41,20 @@ function createGamesService({ getWindow, onGamesChanged }) {
     }
   }
 
-  // a stale entry (no pid yet / dead pid) must not answer "already running"
+  // Everything a run owns once it is over: the entry and the watcher on the
+  // app's request folder (openrelay.js).
+  function forget(id) {
+    const entry = running.get(id)
+    running.delete(id)
+    starting.delete(id)
+    if (entry && entry.openRoot && openRelay) openRelay.unwatch(entry.openRoot)
+  }
+
+  // A dead process must not answer "already running" - but a start that is
+  // still in flight owns its entry, however long a hand-off copy takes.
   function prune() {
     for (const [id, entry] of [...running]) {
-      if (alive(entry.pid)) continue
+      if (!starting.has(id) && !alive(entry.pid)) forget(id)
-      const age = Date.now() - (startedAt.get(id) || 0)
-      if (!entry.pid && age < STARTUP_GRACE_MS) continue // may still be starting
-      running.delete(id)
-      startedAt.delete(id)
     }
   }
 
@@ -83,73 +89,104 @@ function createGamesService({ getWindow, onGamesChanged }) {
     return require('../wines').resolveWine(game.wine || 'system')
   }
 
-  function handleExit(id) {
+  // `entry` is the run that exited: a previous run of the same app (stopped and
-    running.delete(id)
+  // then relaunched) must not take the new run's entry and watcher away.
-    startedAt.delete(id)
+  function handleExit(id, entry) {
+    if (running.get(id) === entry) forget(id)
     sendToWindow(getWindow(), 'games:changed')
     notifyChanged()
     if (onGameExit) onGameExit(id)
   }
 
+  // Native Linux apps skip wine entirely; everything else stays the same.
+  function runnerFor(game) {
+    if (!library.isLinuxGame(game)) return null
+    return payload => runLinuxGame({ game, sandbox, ...payload })
+  }
+
+  // where a native app leaves what it wants opened on the host (openrelay.js)
+  function openRootFor(game) {
+    return library.isLinuxGame(game) ? prefixLinuxRoot(library.prefixNameForGame(game)) : ''
+  }
+
+  // An isolated hand-off copies the document before the app starts, which is
+  // long enough to be worth reporting. The window may not exist yet (a
+  // shortcut boots headless), so the main process gets the event first and
+  // decides whether to put a window in front of the user.
+  function handoffProgress(data) {
+    if (typeof onHandoffProgress === 'function') onHandoffProgress(data)
+    sendToWindow(getWindow(), 'handoff:progress', data)
+  }
+
   async function start(win, id, openFile) {
     const game = library.getGame(id)
     if (!game) return { ok: false, error: 'game-not-found' }
     prune()
-    let wine
+    const isLinux = library.isLinuxGame(game)
+    let wine = null
+    if (!isLinux) {
       try {
         wine = resolveWine(game)
       } catch {
         return { ok: false, error: 'wine-not-found' }
       }
+    }
+    const run = isLinux ? runnerFor(game) : payload => runGame({ game, wine, systemWine: wine.type === 'system', ...payload })
     if (running.has(id)) {
       // a document into a running app is a handoff, not a tracked run
       if (!openFile) return { ok: false, error: 'already-running' }
       try {
-        await runGame({ game, wine, systemWine: wine.type === 'system', openFile, handoff: true })
+        await run({ openFile, handoff: true, onProgress: handoffProgress })
         return { ok: true, pid: null, logFile: null }
       } catch (err) {
         return { ok: false, error: String((err && err.message) || err) }
       }
     }
-    running.set(id, { pid: null, prefix: library.prefixNameForGame(game), wine: wine.id })
+    const openRoot = openRootFor(game)
-    startedAt.set(id, Date.now())
+    const entry = { pid: null, prefix: library.prefixNameForGame(game), wine: wine ? wine.id : '', openRoot }
+    running.set(id, entry)
+    // the app may ask for a folder the moment it paints its window, so the
+    // request file is watched before the run starts
+    if (openRoot && openRelay) openRelay.watch(openRoot)
+    starting.add(id)
     try {
-      const res = await runGame({ game, wine, systemWine: wine.type === 'system', onExit: () => handleExit(id), openFile })
+      const res = await run({ onExit: () => handleExit(id, entry), openFile, onProgress: handoffProgress })
       // stop requested while still starting: kill and clear
       if (killRequests.has(id)) {
         killRequests.delete(id)
         if (res.pid) killProcessGroup(res.pid)
-        running.delete(id)
+        forget(id)
-        startedAt.delete(id)
         sendToWindow(win, 'games:changed')
         notifyChanged()
         return { ok: true, pid: null, logFile: res.logFile || null }
       }
       // no pid: never keep the entry, it would block the next launch
       if (!res.pid) {
-        running.delete(id)
+        forget(id)
-        startedAt.delete(id)
         return { ok: false, error: 'not-started' }
       }
-      const entry = running.get(id)
+      starting.delete(id)
-      if (entry) entry.pid = res.pid
+      entry.pid = res.pid
       sendToWindow(win, 'games:changed')
       notifyChanged()
       return { ok: true, pid: res.pid, logFile: res.logFile || null }
     } catch (err) {
-      running.delete(id)
+      killRequests.delete(id)
-      startedAt.delete(id)
+      forget(id)
       return { ok: false, error: String((err && err.message) || err) }
     }
   }
 
-  // Stop always clears the state.
+  // Stop clears the state - except while a run is still starting: that start
+  // kills it the moment it has a pid, and clearing the entry here would let a
+  // second launch race past the running one.
   async function kill(id) {
     const entry = running.get(id)
+    if (entry && !entry.pid) killRequests.add(id)
+    else {
       if (entry) killProcessGroup(entry.pid)
-    else if (running.has(id)) killRequests.add(id)
+      forget(id)
-    running.delete(id)
+    }
-    startedAt.delete(id)
     sendToWindow(getWindow(), 'games:changed')
     notifyChanged()
     return { ok: true }
@@ -158,6 +195,8 @@ function createGamesService({ getWindow, onGamesChanged }) {
   async function runToolFor(id, tool, args) {
     const game = library.getGame(id)
     if (!game) return { ok: false, error: 'game-not-found' }
+    // Wine tools make no sense for a native Linux app
+    if (library.isLinuxGame(game)) return { ok: false, error: 'not-windows' }
     let wine
     try {
       wine = resolveWine(game)
@@ -177,8 +216,8 @@ function createGamesService({ getWindow, onGamesChanged }) {
     onGameExit = typeof fn === 'function' ? fn : null
   }
 
-  async function importTo(win, srcDir, mode) {
+  async function importTo(win, srcDir, mode, kind) {
-    return importGame(srcDir, mode, data => sendToWindow(win, 'import:progress', data))
+    return importGame(srcDir, mode, data => sendToWindow(win, 'import:progress', data), kind)
   }
 
   // prefix import: register in place, nothing copied

src/ipc/index.js

@@ -9,7 +9,9 @@ const library = require('../library')
 const wines = require('../wines')
 const prefixes = require('../prefixes')
 const runner = require('../runner')
-const { extractIconFromExe } = require('../icons')
+const linuxrunner = require('../linuxrunner')
+const { createSandboxProbe } = require('../sandbox')
+const { extractIconFromExe, iconFromLinuxApp } = require('../icons')
 const { createGamesService, sendToWindow } = require('./games')
 const shortcuts = require('../shortcuts')
 const openwith = require('../openwith')
@@ -34,21 +36,32 @@ function clearIconDir(id, keep) {
   } catch {}
 }
 
-function extractGameIcon(id, exePath) {
+function extractGameIcon(id, exePath, kind) {
-  const out = path.join(iconDir(id), 'icon.ico')
+  const isLinux = kind === 'linux'
-  const res = extractIconFromExe(exePath, out)
+  // the Linux helper picks the extension itself (png/svg), the PE one is ico
+  const out = path.join(iconDir(id), isLinux ? 'icon' : 'icon.ico')
+  const res = isLinux ? iconFromLinuxApp(exePath, out) : extractIconFromExe(exePath, out)
   // on failure nothing is cleared, so the previous icon survives a wrong exe
   if (res.ok) {
-    clearIconDir(id, 'icon.ico')
+    clearIconDir(id, path.basename(res.path))
-    library.updateGame(id, { iconSource: out })
+    library.updateGame(id, { iconSource: res.path })
   }
   return res
 }
 
 // --- registration -----------------------------------------------------------
 
-function registerIpc({ getWindow, onGamesChanged }) {
+function registerIpc({ getWindow, onGamesChanged, onHandoffProgress, openRelay }) {
-  const games = createGamesService({ getWindow, onGamesChanged })
+  // one probe per launcher, cached: it decides bwrap vs plain run
+  const sandbox = createSandboxProbe()
+  const games = createGamesService({ getWindow, onGamesChanged, sandbox, onHandoffProgress, openRelay })
+
+  // sandbox --------------------------------------------------------------------
+  ipcMain.handle('sandbox:status', async () => sandbox.status() || (await sandbox.probe()))
+  ipcMain.handle('sandbox:probe', async () => {
+    sandbox.invalidate()
+    return sandbox.probe()
+  })
 
   // i18n ---------------------------------------------------------------------
   ipcMain.handle('i18n:list', async () => {
@@ -107,6 +120,12 @@ function registerIpc({ getWindow, onGamesChanged }) {
     return prefixes.deletePrefix(name, data => sendToWindow(getWindow(), 'import:progress', data))
   })
   ipcMain.handle('prefixes:rename', (e, oldName, newName) => prefixInUse(oldName) || prefixes.renamePrefix(oldName, newName))
+  // The seeded desktop config is ours to drop (app data is not a seed), but a
+  // running app would lose the files under its feet.
+  ipcMain.handle('prefixes:resetLinuxConfig', (e, name) => {
+    if (!prefixes.listPrefixes().prefixes.some(p => p.name === name)) return { ok: false, error: 'notFound' }
+    return prefixInUse(name) || linuxrunner.resetSeededConfig(name)
+  })
   ipcMain.handle('prefixes:setDefault', (e, name) => {
     // switching the default would silently move apps that follow it
     const defs = prefixes.listPrefixes()
@@ -175,7 +194,7 @@ function registerIpc({ getWindow, onGamesChanged }) {
   ipcMain.handle('games:extractIcon', (e, id) => {
     const game = library.getGame(id)
     if (!game || !game.exePath) return { ok: false, error: 'bad-request' }
-    return extractGameIcon(id, game.exePath)
+    return extractGameIcon(id, game.exePath, game.kind)
   })
   // use the exe the field holds (maybe picked but not saved yet)
   ipcMain.handle('games:autoIcon', (e, id, exePath) => {
@@ -183,7 +202,19 @@ function registerIpc({ getWindow, onGamesChanged }) {
     if (!game) return { ok: false, error: 'bad-request' }
     const exe = exePath || game.exePath
     if (!exe) return { ok: false, error: 'bad-request' }
-    return extractGameIcon(id, exe)
+    return extractGameIcon(id, exe, game.kind)
+  })
+  // Linux apps keep their data next to the prefix's Windows side
+  ipcMain.handle('games:openDataFolder', async (e, id) => {
+    const game = library.getGame(id)
+    if (!library.isLinuxGame(game)) return { ok: false, error: 'not-linux' }
+    try {
+      const root = linuxrunner.ensureLinuxPfx(library.prefixNameForGame(game))
+      const err = await shell.openPath(root)
+      return err ? { ok: false, error: err } : { ok: true, path: root }
+    } catch (err) {
+      return errorResult(err)
+    }
   })
 
   // "Open with PLWL" ------------------------------------------------------------------
@@ -226,9 +257,9 @@ function registerIpc({ getWindow, onGamesChanged }) {
     })
     return res.canceled || !res.filePaths[0] ? null : res.filePaths[0]
   })
-  ipcMain.handle('games:import', async (e, srcDir, mode) => {
+  ipcMain.handle('games:import', async (e, srcDir, mode, kind) => {
     try {
-      return await games.import(getWindow(), srcDir, mode)
+      return await games.import(getWindow(), srcDir, mode, kind)
     } catch (err) {
       return errorResult(err)
     }

src/ipc/lansync.js

@@ -8,11 +8,11 @@ function registerLanSyncIpc({ getWindow }) {
   ipcMain.handle('lansync:get', () => lansync.getState())
   ipcMain.handle('lansync:devices', () => lansync.listDevices())
   ipcMain.handle('lansync:rerollDeviceId', () => {
-    const identity = lansync.rerollDeviceId()
+    const identity = lansync.rotateDeviceId()
     return { deviceId: identity.deviceId }
   })
   ipcMain.handle('lansync:rerollSyncCode', () => {
-    const identity = lansync.rerollSyncCode()
+    const identity = lansync.rotateSyncCode()
     return { syncCode: identity.syncCode }
   })
   ipcMain.handle('lansync:forget', (e, id) => {
@@ -24,6 +24,9 @@ function registerLanSyncIpc({ getWindow }) {
     return { ok: true }
   })
   ipcMain.handle('lansync:respondIncoming', (e, requestId, accept) => lansync.respondIncoming(requestId, accept))
+  ipcMain.handle('lansync:items', () => lansync.syncItems())
+  ipcMain.handle('lansync:reviewTree', (e, id, rel) => lansync.reviewTree(id, rel))
+  ipcMain.handle('lansync:reviewDecide', (e, id, decision) => lansync.respondReview(id, decision))
   ipcMain.handle('lansync:sync', async (e, payload) => {
     try {
       return await lansync.syncTo({
@@ -31,6 +34,7 @@ function registerLanSyncIpc({ getWindow }) {
         code: payload && payload.code,
         categories: payload && payload.categories,
         force: !!(payload && payload.force),
+        selection: payload && payload.selection,
         onProgress: data => sendToWindow(getWindow(), 'lansync:progress', data)
       })
     } catch (err) {

src/lansync-identity.js

@@ -93,7 +93,7 @@ function createIdentity(configFile) {
   function rememberDevice(id, code, name) {
     const cfg = identity()
     const stored = String(code || '').trim().toUpperCase()
-    cfg.known = { ...cfg.known, [id]: { code: stored, syncCode: stored, name: name || '', at: Date.now() } }
+    cfg.known = { ...cfg.known, [id]: { code: stored, name: name || '', at: Date.now() } }
     writeJson(configFile, cfg)
   }
 

src/lansync-manifest.js

@@ -22,22 +22,30 @@ function createManifestBuilder({ filesPath, filesRoot, hash, mapLimit, concurren
 
   // Walk without following symlinks (dosdevices etc. are part of the sync).
   // Iterative, with one directory's stat/readlink calls in flight together.
-  async function scanTree(abs, rel, out, mtimes) {
+  // `emit` (optional) streams dirs and links out while the walk continues;
+  // file entries only land in `out` (their digest comes later). `onError`
+  // marks the unit incomplete: an entry we could not read is not an entry the
+  // sender decided to delete.
+  async function scanTree(abs, rel, out, mtimes, emit, onError, skip) {
     const queue = [[abs, rel]]
     while (queue.length) {
       const [dirAbs, dirRel] = queue.pop()
       let entries
       try {
         entries = await fsp.readdir(dirAbs, { withFileTypes: true })
-      } catch {
+      } catch (err) {
+        if (onError) onError(err, dirAbs)
         continue
       }
       const dirs = []
       const leaves = []
       for (const entry of entries) {
         const relChild = `${dirRel}/${entry.name}`
+        if (skip && skip.has(relChild)) continue // a selection left it out
         if (entry.isDirectory()) {
-          out.push({ path: relChild, type: 'dir' })
+          const record = { path: relChild, type: 'dir' }
+          out.push(record)
+          if (emit) await emit(record)
           dirs.push([path.join(dirAbs, entry.name), relChild])
         } else {
           leaves.push(entry)
@@ -50,14 +58,20 @@ function createManifestBuilder({ filesPath, filesRoot, hash, mapLimit, concurren
           let target = ''
           try {
             target = await fsp.readlink(absChild)
-          } catch {}
+          } catch (err) {
-          out.push({ path: relChild, type: 'link', target: portableLinkTarget(absChild, target) })
+            if (onError) onError(err, absChild)
+            return
+          }
+          const record = { path: relChild, type: 'link', target: portableLinkTarget(absChild, target) }
+          out.push(record)
+          if (emit) await emit(record)
           return
         }
         let st
         try {
           st = await fsp.stat(absChild)
-        } catch {
+        } catch (err) {
+          if (onError) onError(err, absChild)
           return
         }
         if (!st.isFile()) return
@@ -70,40 +84,75 @@ function createManifestBuilder({ filesPath, filesRoot, hash, mapLimit, concurren
     }
   }
 
-  // Manifest of one unit; `force` skips hashing (receiver replaces everything).
+  // Manifest of one unit, streamed: `handlers` may carry onEntry (a Promise
-  async function buildManifest(roots, force, onProgress) {
+  // per entry, awaited - backpressure), onTotal, onProgress, onIncomplete
+  // (called once, when anything in the tree could not be read) and skip (unit
+  // paths a selection keeps off the wire). File entries go out as their
+  // digests finish, so the receiver compares while this side is still
+  // hashing; hashing itself stays parallel, a batch at a time.
+  async function buildManifestStream(roots, force, handlers) {
+    const skip = handlers && handlers.skip && handlers.skip.length ? new Set(handlers.skip) : null
+    const onEntry = handlers && handlers.onEntry
+    const onTotal = handlers && handlers.onTotal
+    const onProgress = handlers && handlers.onProgress
+    const onIncomplete = handlers && handlers.onIncomplete
     const entries = []
     const mtimes = new Map()
+    let incomplete = false
+    const markIncomplete = (err, file) => {
+      if (incomplete) return
+      incomplete = true
+      if (onIncomplete) onIncomplete(err, file)
+    }
     for (const rel of roots) {
+      if (skip && skip.has(rel)) continue
       const abs = filesPath(rel)
-      if (!abs) continue
+      if (!abs) {
+        markIncomplete(new Error('bad-unit-path'), rel)
+        continue
+      }
       let st
       try {
         st = await fsp.lstat(abs)
-      } catch {
+      } catch (err) {
+        // a root that is simply not there is a unit with nothing in it
+        if (err && err.code !== 'ENOENT') markIncomplete(err, abs)
         continue
       }
       if (st.isSymbolicLink()) {
         let target = ''
         try {
           target = await fsp.readlink(abs)
-        } catch {}
+        } catch (err) {
-        entries.push({ path: rel, type: 'link', target: portableLinkTarget(abs, target) })
+          markIncomplete(err, abs)
+          continue
+        }
+        const record = { path: rel, type: 'link', target: portableLinkTarget(abs, target) }
+        entries.push(record)
+        if (onEntry) await onEntry(record)
       } else if (st.isDirectory()) {
-        entries.push({ path: rel, type: 'dir' })
+        const record = { path: rel, type: 'dir' }
-        await scanTree(abs, rel, entries, mtimes)
+        entries.push(record)
+        if (onEntry) await onEntry(record)
+        await scanTree(abs, rel, entries, mtimes, onEntry, markIncomplete, skip)
       } else if (st.isFile()) {
         entries.push({ path: rel, type: 'file', size: st.size, mode: st.mode & 0o777, hash: null })
         mtimes.set(rel, st.mtimeMs || 0)
       }
     }
     const files = entries.filter(e => e.type === 'file')
-    // total size is known before hashing, so the bar starts empty
+    // total size is known before hashing: the receiver sizes its compare bar
+    // from this, the sender's popup from onProgress
     const totalBytes = files.reduce((sum, entry) => sum + (entry.size || 0), 0)
-    if (!force && files.length) {
+    if (onTotal) await onTotal(totalBytes)
     let done = 0
     let hashed = 0
-      await mapLimit(files, concurrency, async entry => {
+    // one batch hashes with the whole disk queue behind it; its entries go
+    // on the wire in order before the next batch starts
+    for (let i = 0; i < files.length; i += concurrency) {
+      const batch = files.slice(i, i + concurrency)
+      if (!force) {
+        await Promise.all(batch.map(async entry => {
           const abs = filesPath(entry.path)
           try {
             // unchanged size + mtime: the cached digest still holds
@@ -114,19 +163,35 @@ function createManifestBuilder({ filesPath, filesRoot, hash, mapLimit, concurren
                 if (onProgress) onProgress(done, files.length, hashed, totalBytes)
               })
               : null
-        } catch {
+            if (!entry.hash) markIncomplete(new Error('unreadable-file'), entry.path)
+          } catch (err) {
             entry.hash = null
+            markIncomplete(err, entry.path)
           }
+        }))
+      }
+      for (const entry of batch) {
         done++
         if (!entry.hash) hashed += entry.size || 0 // nothing read: still report the file as passed over
         if (onProgress) onProgress(done, files.length, hashed, totalBytes)
-      })
+        if (onEntry) await onEntry(entry)
+      }
     }
     hash.save()
     return entries
   }
 
-  return { buildManifest, scanTree, portableLinkTarget }
+  // Buffering variant for callers that want the whole manifest first.
+  async function buildManifest(roots, force, onProgress) {
+    const entries = []
+    await buildManifestStream(roots, force, {
+      onProgress,
+      onEntry: entry => { entries.push(entry) }
+    })
+    return entries
+  }
+
+  return { buildManifest, buildManifestStream, scanTree, portableLinkTarget }
 }
 
 module.exports = { createManifestBuilder }

src/lansync-plan.js

@@ -0,0 +1,167 @@
+'use strict'
+
+// Deletions a sync would make, computed but not executed. A mirror is the goal
+// ("the sender's tree wins"), but a file the user still needs is not a
+// leftover: everything is held until the receiver approves the list.
+
+const fs = require('fs')
+const fsp = fs.promises
+
+const baseName = rel => String(rel || '').split('/').pop()
+
+// `rel` lies at or below `parent`.
+function isUnder(rel, parent) {
+  return rel === parent || rel.startsWith(parent + '/')
+}
+
+// A path the receiver must keep lies at or below `rel`.
+function keepInside(rel, keep) {
+  for (const kept of keep) if (isUnder(kept, rel)) return true
+  return false
+}
+
+function keptBy(rel, keep) {
+  for (const kept of keep) if (isUnder(rel, kept)) return true
+  return false
+}
+
+// One entry and, for a folder, everything in it. `full` means nothing inside
+// survives, so the whole subtree can be shown (and deleted) as one row.
+async function planEntry(abs, rel, keep) {
+  let st
+  try {
+    st = await fsp.lstat(abs)
+  } catch {
+    return null
+  }
+  if (!st.isDirectory() || st.isSymbolicLink()) {
+    const file = st.isFile()
+    return { path: rel, name: baseName(rel), type: file ? 'file' : 'link', files: 1, bytes: file ? st.size : 0, full: true, children: [] }
+  }
+  let entries
+  try {
+    entries = await fsp.readdir(abs, { withFileTypes: true })
+  } catch {
+    // an unreadable folder is not ours to delete: its contents are unknown
+    return null
+  }
+  const children = []
+  let survived = 0
+  let files = 0
+  let bytes = 0
+  for (const entry of entries) {
+    const childRel = `${rel}/${entry.name}`
+    if (keep.has(childRel)) {
+      survived++
+      continue
+    }
+    const child = await planEntry(`${abs}/${entry.name}`, childRel, keep)
+    if (!child) {
+      survived++
+      continue
+    }
+    children.push(child)
+    files += child.files
+    bytes += child.bytes
+  }
+  return { path: rel, name: baseName(rel), type: 'dir', files, bytes, full: survived === 0, children }
+}
+
+// Walk a folder the sender also has: entries missing from `keep` are planned,
+// kept folders are descended into (they may hold files the sender lacks).
+// `protect` is a subtree the plan must not touch at all (an app a selection
+// left out of the sync).
+async function walkDeletions(abs, rel, keep, protect) {
+  const out = []
+  let entries
+  try {
+    entries = await fsp.readdir(abs, { withFileTypes: true })
+  } catch {
+    return out
+  }
+  for (const entry of entries) {
+    const childRel = `${rel}/${entry.name}`
+    if (protect.has(childRel)) continue
+    if (keep.has(childRel)) {
+      if (entry.isDirectory() && !entry.isSymbolicLink()) {
+        out.push(...await walkDeletions(`${abs}/${entry.name}`, childRel, keep, protect))
+      }
+      continue
+    }
+    const node = await planEntry(`${abs}/${entry.name}`, childRel, keep)
+    if (node) out.push(node)
+  }
+  return out
+}
+
+// Top-level leftovers of a registry folder (`apps/`, `wines/`, `wineprefixes/`):
+// names in `keepNames` survive, the rest is planned whole. Same shape as the
+// old removeOrphans, but nothing is deleted.
+async function planListed(listDirAbs, dirRel, keepNames) {
+  const out = []
+  let entries
+  try {
+    entries = await fsp.readdir(listDirAbs, { withFileTypes: true })
+  } catch {
+    return out
+  }
+  for (const entry of entries) {
+    if (keepNames.has(entry.name)) continue
+    const node = await planEntry(`${listDirAbs}/${entry.name}`, `${dirRel}/${entry.name}`, new Set())
+    if (node) out.push(node)
+  }
+  return out
+}
+
+function totalsOf(nodes) {
+  let files = 0
+  let bytes = 0
+  for (const node of nodes) {
+    files += node.files || 0
+    bytes += node.bytes || 0
+  }
+  return { files, bytes }
+}
+
+function clampNodes(nodes) {
+  return Array.isArray(nodes) ? nodes.filter(node => node && typeof node.path === 'string' && Array.isArray(node.children)) : []
+}
+
+// Delete what was approved, count what actually went. Deletion happens here
+// and only here: the plan phase never removes anything.
+async function removeNodes(nodes, keep, filesPath, onProgress) {
+  const out = { entries: 0, files: 0, bytes: 0 }
+  for (const node of clampNodes(nodes)) {
+    if (keptBy(node.path, keep)) continue
+    const abs = filesPath(node.path)
+    if (!abs) continue
+    await removeNode(abs, node, keep, out, onProgress)
+  }
+  return out
+}
+
+async function removeNode(abs, node, keep, out, onProgress) {
+  // nothing inside survives -> one recursive delete
+  if (!keepInside(node.path, keep)) {
+    try {
+      if (fs.lstatSync(abs)) fs.rmSync(abs, { recursive: true, force: true })
+    } catch {
+      return
+    }
+    out.entries++
+    out.files += node.files || 0
+    out.bytes += node.bytes || 0
+    if (onProgress) onProgress(out)
+    return
+  }
+  for (const child of node.children || []) {
+    if (keptBy(child.path, keep)) continue
+    await removeNode(`${abs}/${child.name}`, child, keep, out, onProgress)
+  }
+  // a folder emptied by the approved deletions goes too, but only when empty
+  try {
+    if (!fs.readdirSync(abs).length) fs.rmdirSync(abs)
+  } catch {}
+}
+
+module.exports = { planEntry, walkDeletions, planListed, totalsOf, removeNodes }

src/lansyncpush.js

@@ -1,8 +1,9 @@
 'use strict'
 
-// The pushing side of a LAN sync: per unit, send a manifest, learn what the
+// The pushing side of a LAN sync: per unit, stream a manifest while it is
-// receiver has, upload the rest, delete the surplus. Exported as a factory;
+// still being hashed, learn what the receiver has, upload the rest, delete
-// src/lansync.js hands in its own helpers and state.
+// the surplus. Exported as a factory; src/lansync.js hands in its own
+// helpers and state.
 
 const http = require('http')
 const os = require('os')
@@ -12,10 +13,28 @@ const path = require('path')
 // Files sent at once: one at a time wastes LAN round trips on small files.
 const UPLOAD_CONCURRENCY = 4
 
+// Two lost heartbeats in a row: the receiver is gone (40 s of silence).
+const MAX_MISSED_PINGS = 2
+
+// One file, one PUT. A file that has not finished on its own after this long
+// (stalled receiver, lost socket while the OS still reports it open, a file
+// that changed size after the manifest) fails the whole sync instead of
+// hanging it forever. Env override for tests.
+const UPLOAD_TIMEOUT_MS = Number(process.env.PLWL_LANSYNC_UPLOAD_TIMEOUT) || 10 * 60 * 1000
+
 // Keeps the receiver alive while this side hashes (minutes of silence); env
 // override for tests.
 const HEARTBEAT_MS = Number(process.env.PLWL_LANSYNC_HEARTBEAT) || 20000
 
+// One ping round trip; env override for tests.
+const PING_TIMEOUT_MS = Number(process.env.PLWL_LANSYNC_PING_TIMEOUT) || 10000
+
+// How often the sender asks the receiver's popup whether the deletion list is
+// settled, and how long it waits for a human before giving up (nothing is
+// deleted on a timeout, so the safe answer is also the fallback).
+const REVIEW_POLL_MS = Number(process.env.PLWL_LANSYNC_REVIEW_POLL) || 1500
+const REVIEW_WAIT_MS = Number(process.env.PLWL_LANSYNC_REVIEW_WAIT) || 15 * 60 * 1000
+
 function createPusher(api) {
   const {
     CATEGORIES,
@@ -26,7 +45,7 @@ function createPusher(api) {
     httpJson,
     filesPath,
     ownedRoot,
-    buildManifest,
+    buildManifestStream,
     listDirs,
     DIRS,
     toPortablePath,
@@ -35,12 +54,16 @@ function createPusher(api) {
     prefixes
   } = api
 
-  // Manifest in, upload list out; NDJSON avoids one giant string.
+  // Manifest in, upload list out; NDJSON avoids one giant string. The body
-  function planUnit(device, token, unit, entries, force, meta) {
+  // is written by `produce` WHILE the sender hashes, so the receiver can
+  // compare entries as they arrive (both sides hash at the same time).
+  function planUnit(device, token, unit, force, meta, produce) {
     // announced up front, so the receiver's popup can say "Apps: 2/5"
     const totals = meta && meta.totals ? `&totals=${encodeURIComponent(JSON.stringify(meta.totals))}` : ''
+    // folders a selection kept off the wire must not be pruned on the other side
+    const exclude = unit.exclude && unit.exclude.length ? `&exclude=${encodeURIComponent(JSON.stringify(unit.exclude))}` : ''
     return new Promise((resolve, reject) => {
-      const route = `/plwl/unit/plan?token=${encodeURIComponent(token)}&unit=${encodeURIComponent(unit.key)}&label=${encodeURIComponent(unit.label || '')}&roots=${encodeURIComponent(JSON.stringify(unit.roots))}${force ? '&force=1' : ''}${totals}`
+      const route = `/plwl/unit/plan?token=${encodeURIComponent(token)}&unit=${encodeURIComponent(unit.key)}&label=${encodeURIComponent(unit.label || '')}&roots=${encodeURIComponent(JSON.stringify(unit.roots))}${force ? '&force=1' : ''}${totals}${exclude}`
       const req = http.request(
         {
           host: device.address,
@@ -62,65 +85,143 @@ function createPusher(api) {
           })
         }
       )
-      req.on('error', reject)
+      let dead = null
-      let index = 0
+      req.on('error', err => {
-      const pump = () => {
+        dead = err
-        while (index < entries.length) {
+        reject(err)
-          if (!req.write(`${JSON.stringify(entries[index++])}\n`)) {
+      })
-            req.once('drain', pump)
+      // ordered writes with backpressure: the receiver reads continuously,
-            return
+      // but a slow socket must not buffer the whole manifest in memory
+      const write = obj => new Promise((resolveWrite, rejectWrite) => {
+        if (dead) return rejectWrite(dead)
+        const onDrain = () => {
+          cleanup()
+          resolveWrite()
         }
+        const onErr = () => {
+          cleanup()
+          rejectWrite(dead || new Error('plan-write-failed'))
         }
-        req.end()
+        const cleanup = () => {
+          req.off('drain', onDrain)
+          req.off('error', onErr)
         }
-      pump()
+        if (req.write(`${JSON.stringify(obj)}\n`)) {
+          cleanup()
+          return resolveWrite()
+        }
+        req.once('drain', onDrain)
+        req.once('error', onErr)
+      })
+      produce(write).then(() => req.end(), err => {
+        try { req.destroy() } catch {}
+        reject(err)
+      })
     })
   }
 
-  function putFile(device, token, unitKey, rel, abs) {
+  function putFile(device, token, unitKey, rel, abs, onBytes) {
     return new Promise((resolve, reject) => {
-      // unit and path travel as headers: constant per request
+      const settle = (fn, value) => {
+        clearTimeout(timer)
+        fn(value)
+      }
+      // Unit and path travel in the query, percent-encoded: Node refuses any
+      // header value holding a code above U+00FF (ERR_INVALID_CHAR), which a
+      // real library has (Minecraft pack names, Polish file names), and that
+      // refusal used to kill the sync mid-unit.
+      const query = `token=${encodeURIComponent(token)}&unit=${encodeURIComponent(unitKey)}&path=${encodeURIComponent(rel)}`
       const req = http.request(
         {
           host: device.address,
           port: device.port,
-          path: `/plwl/unit/file?token=${encodeURIComponent(token)}`,
+          path: `/plwl/unit/file?${query}`,
           method: 'PUT',
           headers: {
             'content-type': 'application/octet-stream',
-            'content-length': fs.statSync(abs).size,
+            'content-length': fs.statSync(abs).size
-            'x-plwl-unit': unitKey,
-            'x-plwl-path': rel
           },
           timeout: 0
         },
         res => {
           res.resume()
-          res.on('end', () => resolve({ status: res.statusCode }))
+          res.on('end', () => settle(resolve, { status: res.statusCode }))
+          res.on('aborted', () => settle(reject, new Error('response-aborted')))
         }
       )
-      req.on('error', reject)
+      // The timer spans the WHOLE transfer, response included: a stalled
+      // receiver or a silently lost socket must fail the sync instead of
+      // hanging the popup on the last file. Generous - a file would have to
+      // take over ten minutes at 20 MB/s to hit it.
+      const timer = setTimeout(() => {
+        req.destroy(new Error('upload-timeout'))
+        settle(reject, new Error('upload-timeout'))
+      }, UPLOAD_TIMEOUT_MS)
+      if (timer.unref) timer.unref()
+      req.on('error', err => settle(reject, err))
       const stream = fs.createReadStream(abs)
-      stream.on('error', reject)
+      stream.on('error', err => settle(reject, err))
+      // live bytes: a multi-GB file has to move the counter while it flies,
+      // not only when its response lands (read = what this side hands over)
+      if (onBytes) stream.on('data', chunk => onBytes(chunk.length))
+      // pipe ends the request when the file ends; a body shorter than the
+      // declared content-length (file changed mid-sync) wedges the receiver
+      // - its own idle watchdog breaks that, this side's timer breaks every
+      // other silent case
       stream.pipe(req)
     })
   }
 
   // --- units ----------------------------------------------------------------
 
-  function appUnits(cats) {
+  // A selection lists unit keys ("app:1", "wine:GE-Proton9-20", "prefix:Main");
+  // absent means everything travels. `apps` is the older app-id-only shape.
+  function selectionOf(selection) {
+    const units = selection && Array.isArray(selection.units) ? new Set(selection.units.map(String)) : null
+    const apps = selection && Array.isArray(selection.apps) ? new Set(selection.apps.map(String)) : null
+    return {
+      active: !!units || !!apps,
+      has(key, id) {
+        if (units && !units.has(key)) return false
+        if (apps && String(key).startsWith('app:') && !apps.has(String(id))) return false
+        return true
+      }
+    }
+  }
+
+  function appUnits(cats, sel) {
     const units = []
     for (const game of library.loadGames()) {
       const category = api.appCategory(game)
       if (!category || !cats.has(category)) continue
+      if (!sel.has(`app:${game.id}`, game.id)) continue
       const roots = [`data/icons/${game.id}`]
-      if (category === 'apps-portable') roots.unshift(`apps/${game.id}`)
+      if (category === 'apps-portable') {
+        // the app's own folder, never apps/<id> guessed from the entry
+        const rel = String(toPortablePath(library.appFolder(game)) || '')
+        roots.unshift(rel.startsWith('apps/') ? rel : `apps/${game.id}`)
+      }
       units.push({ key: `app:${game.id}`, kind: 'app', id: game.id, label: game.name, roots })
     }
     return units
   }
 
-  function wineUnits() {
+  // A prefix app a selection leaves out stays on this side: its folder must not
+  // travel with the prefix, and the receiver must not prune it as a leftover.
+  function prefixExcludes(name, sel) {
+    const rootRel = `wineprefixes/${name}`
+    const out = []
+    for (const game of library.loadGames()) {
+      if (api.appCategory(game) !== 'apps-prefix' || game.prefix !== name) continue
+      if (sel.has(`app:${game.id}`, game.id)) continue
+      const rel = String(toPortablePath(library.appFolder(game)) || '')
+      if (rel === rootRel || !rel.startsWith(rootRel + '/')) continue
+      out.push(rel)
+    }
+    return out
+  }
+
+  function wineUnits(sel) {
     const units = new Map()
     const add = (root, label) => {
       if (units.has(root)) return
@@ -133,20 +234,29 @@ function createPusher(api) {
       add(parts[0] === 'wines' && parts[1] ? `wines/${parts[1]}` : `wines/${path.basename(wine.path)}`, wine.label)
     }
     for (const name of listDirs(DIRS.WINES)) add(`wines/${name}`)
-    return [...units.values()]
+    return [...units.values()].filter(unit => sel.has(unit.key, unit.id))
   }
 
-  function prefixUnits() {
+  function prefixUnits(sel) {
     const names = new Set(prefixes.listPrefixes().prefixes.map(p => p.name))
     for (const name of listDirs(DIRS.PREFIXES)) names.add(name)
-    return [...names].map(name => ({ key: `prefix:${name}`, kind: 'prefix', id: name, label: name, roots: [`wineprefixes/${name}`] }))
+    const units = []
+    for (const name of names) {
+      if (!sel.has(`prefix:${name}`)) continue
+      const unit = { key: `prefix:${name}`, kind: 'prefix', id: name, label: name, roots: [`wineprefixes/${name}`] }
+      const exclude = prefixExcludes(name, sel)
+      if (exclude.length) unit.exclude = exclude
+      units.push(unit)
+    }
+    return units
   }
 
-  function buildUnits(cats) {
+  function buildUnits(cats, selection) {
+    const sel = selectionOf(selection)
     const units = []
-    if (cats.has('apps-portable') || cats.has('apps-prefix')) units.push(...appUnits(cats))
+    if (cats.has('apps-portable') || cats.has('apps-prefix')) units.push(...appUnits(cats, sel))
-    if (cats.has('wines')) units.push(...wineUnits())
+    if (cats.has('wines')) units.push(...wineUnits(sel))
-    if (cats.has('prefixes')) units.push(...prefixUnits())
+    if (cats.has('prefixes')) units.push(...prefixUnits(sel))
     return units
   }
 
@@ -157,21 +267,27 @@ function createPusher(api) {
     return library.portableGame(game)
   }
 
-  function buildRegistryPayload(categories) {
+  function buildRegistryPayload(categories, selection) {
     const cats = new Set(categories)
+    const sel = selectionOf(selection)
     const payload = { categories: [...cats] }
     if (cats.has('apps-portable') || cats.has('apps-prefix')) {
       payload.apps = library
         .loadGames()
         .filter(game => {
           const category = api.appCategory(game)
-          return category ? cats.has(category) : false
+          if (!category || !cats.has(category)) return false
+          return sel.has(`app:${game.id}`, game.id)
         })
         .map(portableApp)
+      // A partial list means "only these apps travel"; without the marker the
+      // receiver mirrors the category and drops the apps that were left out.
+      if (sel.active) payload.appScope = 'selected'
     }
     if (cats.has('wines')) {
-      // the receiver prunes its own builds down to this list and rescans
+      // the receiver mirrors its own builds down to this list and rescans
-      payload.wines = wineUnits().map(unit => ({ name: unit.id }))
+      payload.wines = wineUnits(sel).map(unit => ({ name: unit.id }))
+      if (sel.active) payload.wineScope = 'selected'
     }
     if (cats.has('settings')) {
       // "Sync settings": registry-level values only; opt-in - apps must not
@@ -198,7 +314,10 @@ function createPusher(api) {
         args: g.args || '',
         env: g.env || {},
         dllOverrides: g.dllOverrides || [],
-        disableUmu: !!g.disableUmu
+        disableUmu: !!g.disableUmu,
+        // Linux-only app config, part of the app's configuration as well
+        isolation: g.isolation,
+        forceX11: !!g.forceX11
       }))
       payload.appOrder = games.map(g => g.id)
     }
@@ -206,8 +325,11 @@ function createPusher(api) {
       const defs = prefixes.listPrefixes()
       payload.prefixes = {
         default: defs.default,
-        prefixes: defs.prefixes.map(p => ({ name: p.name, created: p.created, locked: !!p.locked }))
+        prefixes: defs.prefixes
+          .filter(p => sel.has(`prefix:${p.name}`))
+          .map(p => ({ name: p.name, created: p.created, locked: !!p.locked }))
       }
+      if (sel.active) payload.prefixScope = 'selected'
     }
     return payload
   }
@@ -220,86 +342,38 @@ function createPusher(api) {
       uploaded: 0,
       skipped: 0,
       deleted: 0,
+      // files the receiver asked to keep when the deletion list was reviewed
+      kept: 0,
       bytes: 0,
+      // size of the synced trees as they now sit on the other device
+      sizeBytes: 0,
       // the popup reports "3 games, 1 prefix" instead of file counts
-      items: { apps: 0, wines: 0, prefixes: 0 },
+      items: { apps: 0, wines: 0, prefixes: 0 }
-      apps: { copied: 0, skipped: 0, deleted: 0 },
-      wines: { copied: 0, skipped: 0, deleted: 0 },
-      prefixes: { copied: 0, skipped: 0, deleted: 0 }
     }
   }
 
   // Every sync resolves to the same shape, success or failure.
-  function syncResult(ok, error, summary, events) {
+  function syncResult(ok, error, summary) {
-    const buckets = { apps: summary.apps, prefixes: summary.prefixes, wines: summary.wines }
+    return { ok, error: error || null, summary }
-    summary.progress = events.length
-    summary.events = events.length
-    return {
-      ok,
-      error: error || null,
-      summary,
-      stats: buckets,
-      report: buckets,
-      counts: buckets,
-      details: buckets,
-      perCategory: buckets,
-      categories: buckets,
-      apps: summary.apps,
-      prefixes: summary.prefixes,
-      wines: summary.wines,
-      progress: events,
-      events,
-      progressEvents: events,
-      progressLog: events,
-      progressCount: events.length
-    }
   }
 
   // Push to the peer; a rejected code comes back as 'bad-code'.
-  async function syncToDevice({ deviceId, device: target, code, categories, force, onProgress }) {
+  async function syncToDevice({ deviceId, device: target, code, categories, force, selection, onProgress }) {
-    const fail = (error, summary, events) => syncResult(false, error, summary || newSummary(0), events || [])
+    const fail = (error, summary) => syncResult(false, error, summary || newSummary(0))
     const device = target || api.listDevices().find(d => d.id === deviceId)
     if (!device || !device.address || !device.port) return fail('offline')
     const cats = new Set(normalizeCategories(categories))
     if (!cats.size) return fail('nothing-selected')
     // units are known before anything is read: announce them with the verify
-    const units = buildUnits(cats)
+    const units = buildUnits(cats, selection)
     const bucketOf = kind => (kind === 'wine' ? 'wines' : kind === 'prefix' ? 'prefixes' : 'apps')
-    const totals = { apps: 0, wines: 0, prefixes: 0 }
+    const totals = { apps: 0, wines: 0, prefixes: 0, settings: 0 }
     for (const unit of units) totals[bucketOf(unit.kind)] += 1
-    // every progress event is kept, so callers can report without subscribing
+    if (cats.has('settings')) totals.settings = 1
-    const events = []
     const progress = data => {
-      events.push(data)
       if (onProgress) onProgress(data)
     }
 
-    let verified
-    try {
-      // longer than the receiver's incoming-request timeout (popup wait)
-      verified = await httpJson(device, 'POST', '/plwl/verify', {
-        json: { deviceId: identity().deviceId, name: os.hostname(), code: String(code == null ? '' : code).trim().toUpperCase(), totals },
-        timeout: 90000
-      })
-    } catch (err) {
-      return fail(String((err && err.message) || err))
-    }
-    if (!verified.data || !verified.data.ok) {
-      const error = (verified.data && verified.data.error) || `http-${verified.status}`
-      // a rotated code drops the pairing; a plain 'rejected' keeps it
-      if (error === 'auth-failed' || error === 'bad-code') forgetDevice(device.id || deviceId)
-      return fail(error)
-    }
-    const token = verified.data.token
-    // paired now: the next sync needs no typing
-    rememberDevice(device.id || deviceId, code, device.name)
-
-    // hashing precedes any byte: keep the receiver's popup alive meanwhile
-    const heartbeat = setInterval(() => {
-      httpJson(device, 'POST', `/plwl/ping?token=${encodeURIComponent(token)}`, { json: {}, timeout: 10000 }).catch(() => {})
-    }, HEARTBEAT_MS)
-    if (heartbeat.unref) heartbeat.unref()
-
     const summary = newSummary(units.length)
     const finished = { apps: 0, wines: 0, prefixes: 0 }
     // planned bytes so far, so the popup can show "1.2 GB / 3.4 GB"
@@ -338,43 +412,139 @@ function createPusher(api) {
       }
       return data
     }
-    // snapshot per file, forward a few times per second (phase changes always)
+    // Snapshot per file, forward a few times per second (phase changes
-    const gate = typeof api.progressGate === 'function' ? api.progressGate(progress) : data => progress(data)
+    // always). The snapshot is built when the gate flushes, not when it is
-    const emit = (phase, unit, done, total, force) => gate(snapshot(phase, unit, done, total), !!force)
+    // pushed: a throttled byte count must not be one gate window old.
+    const emitNow = data => progress(typeof data === 'function' ? data() : data)
+    const gate = typeof api.progressGate === 'function' ? api.progressGate(emitNow) : emitNow
+    const emit = (phase, unit, done, total, force) => gate(() => snapshot(phase, unit, done, total), !!force)
+    // consent may wait on a human: say so before anything else happens
+    emit('wait', null, null, null, true)
+
+    let verified
+    try {
+      // longer than the receiver's incoming-request timeout (popup wait)
+      verified = await httpJson(device, 'POST', '/plwl/verify', {
+        json: { deviceId: identity().deviceId, name: os.hostname(), code: String(code == null ? '' : code).trim().toUpperCase(), totals },
+        timeout: 90000
+      })
+    } catch (err) {
+      return fail(String((err && err.message) || err))
+    }
+    if (!verified.data || !verified.data.ok) {
+      const error = (verified.data && verified.data.error) || `http-${verified.status}`
+      // a rotated code drops the pairing; a plain 'rejected' keeps it
+      if (error === 'auth-failed' || error === 'bad-code') forgetDevice(device.id || deviceId)
+      return fail(error)
+    }
+    // An older peer prunes inside its commit, with no list to approve: units
+    // must not travel there at all. Settings alone are additive and fine.
+    if (!verified.data.review && units.length) return fail('old-peer')
+    const token = verified.data.token
+    // paired now: the next sync needs no typing
+    rememberDevice(device.id || deviceId, code, device.name)
+
+    // The heartbeat keeps the receiver's popup alive while this side hashes
+    // (minutes of silence). Consecutive ping failures mean the peer dropped
+    // (crash, sleep, lost network): without this a dead receiver hangs the
+    // sync until the next request notices, which may be never.
+    let missedPings = 0
+    const abort = { dead: false, reject: null }
+    const abortPromise = new Promise((resolve, reject) => { abort.reject = reject })
+    abortPromise.catch(() => {}) // only awaited via Promise.race below
+    const heartbeat = setInterval(() => {
+      httpJson(device, 'POST', `/plwl/ping?token=${encodeURIComponent(token)}`, { json: {}, timeout: PING_TIMEOUT_MS })
+        .then(() => { missedPings = 0 })
+        .catch(() => {
+          missedPings++
+          if (missedPings >= MAX_MISSED_PINGS && !abort.dead) {
+            abort.dead = true
+            abort.reject(new Error('receiver-lost'))
+          }
+        })
+    }, HEARTBEAT_MS)
+    if (heartbeat.unref) heartbeat.unref()
+
     const end = async () => {
       try {
         await httpJson(device, 'POST', `/plwl/end?token=${encodeURIComponent(token)}`, { json: {} })
       } catch {}
     }
+    // The receiver's popup is a human, so the sender waits - visibly, and with
+    // a deadline. A timeout deletes nothing on purpose.
+    const waitForReview = async (device, token, review, emit, abort) => {
+      emit('review', null, null, null, true)
+      const deadline = Date.now() + REVIEW_WAIT_MS
+      while (Date.now() < deadline) {
+        if (abort.dead) throw new Error('receiver-lost')
         try {
+          const res = await httpJson(device, 'GET', `/plwl/review?token=${encodeURIComponent(token)}&id=${encodeURIComponent(review.id)}`, { timeout: 20000 })
+          const data = res && res.data ? res.data : {}
+          if (data.state === 'done' || data.state === 'timeout' || data.state === 'skipped') {
+            return { deleted: Number(data.deleted) || 0, kept: Number(data.kept) || 0 }
+          }
+        } catch {}
+        await new Promise(resolve => setTimeout(resolve, REVIEW_POLL_MS))
+      }
+      return { deleted: 0, kept: 0 }
+    }
+    const runUnits = async () => {
       for (const unit of units) {
+        if (abort.dead) throw new Error('receiver-lost')
         const roots = unit.roots.filter(ownedRoot)
         if (!roots.length) continue
         const kind = bucketOf(unit.kind)
-        const bucket = summary[kind]
         summary.items[kind] += 1
         itemsSeen += 1
         barBytes = 0
         barTotal = 0
         emit('scan', unit, null, null, true)
-        const entries = await buildManifest(roots, !!force, (done, total, hashedBytes, totalBytes) => {
+        // The manifest streams WHILE this side hashes its tail: the receiver
+        // compares entries as they arrive, so both devices hash at the same
+        // time. Once this side is done hashing, the popup keeps a full bar
+        // and the waiting text until the plan answers (a cached sender waits
+        // for a receiver that still has to hash).
+        const entries = []
+        let writes = Promise.resolve()
+        // A read failure means this manifest is not the sender's whole tree:
+        // tell the receiver, so it never prunes what only looked missing.
+        const incomplete = () => {
+          writes = writes.then(() => write({ unitIncomplete: true }))
+        }
+        const plan = await planUnit(device, token, { ...unit, roots }, !!force, { totals }, async write => {
+          await buildManifestStream(roots, !!force, {
+            // an app the selection left out does not travel with its prefix
+            skip: unit.exclude,
+            // the receiver sizes its compare bar from this, before any hashing
+            onTotal: totalBytes => {
+              writes = writes.then(() => write({ unitBytes: totalBytes }))
+            },
+            onEntry: entry => {
+              entries.push(entry)
+              writes = writes.then(() => write(entry))
+            },
+            onIncomplete: incomplete,
+            onProgress: (hashedDone, hashedTotal, hashedBytes, totalBytes) => {
               barBytes = hashedBytes
               barTotal = totalBytes
-          // no file count until the plan returns
               emit('hash', unit, null, null)
+            }
           })
-        emit('plan', unit, null, null, true)
+          await writes
-        const plan = await planUnit(device, token, { ...unit, roots }, entries, !!force, { totals })
+          // this side is done hashing; the receiver may still be comparing
+          barTotal = barTotal || 1
+          barBytes = barTotal
+          emit('wait', unit, null, null, true)
+        })
+        if (abort.dead) throw new Error('receiver-lost')
         if (!plan.data || !plan.data.ok) throw new Error((plan.data && plan.data.error) || `http-${plan.status}`)
+        // every file in the unit, including the ones already identical there
+        for (const entry of entries) if (entry.type === 'file') summary.sizeBytes += entry.size || 0
         const upload = new Set(plan.data.upload || [])
         const same = new Set(plan.data.same || [])
-        // per category: files created/overwritten vs already identical
+        const filePaths = new Set(entries.filter(e => e.type === 'file').map(e => e.path))
-        const fileEntries = entries.filter(e => e.type === 'file')
-        const filePaths = new Set(fileEntries.map(e => e.path))
         let sameFiles = 0
         for (const p of same) if (filePaths.has(p)) sameFiles++
-        bucket.copied += fileEntries.length - sameFiles
-        bucket.skipped += sameFiles
         summary.skipped += sameFiles
         const pending = []
         for (const entry of entries) {
@@ -383,40 +553,48 @@ function createPusher(api) {
           pending.push(entry)
           plannedBytes += entry.size || 0
         }
-        // a few files in flight at once: small files cost round trips
+        // a few files in flight at once: small files cost round trips; the
-        // the bar counts only bytes that move, and starts empty for the copy
+        // bar counts only bytes that move and starts empty for the copy
         if (pending.length) {
           barBytes = 0
           barTotal = pending.reduce((sum, entry) => sum + (entry.size || 0), 0)
           emit('copy', unit, allDone, allTotal + pending.length, true)
-        }
           let failed = null
           let done = 0
           const send = async entry => {
-          if (failed) return
+            if (failed || abort.dead) return
-          const res = await putFile(device, token, unit.key, entry.path, filesPath(entry.path))
+            const res = await putFile(device, token, unit.key, entry.path, filesPath(entry.path), delta => {
+              summary.bytes += delta
+              barBytes += delta
+              emit('copy', unit, allDone + done, allTotal + pending.length)
+            })
             if (res.status !== 200) {
               failed = new Error(`upload-failed-${res.status}`)
               return
             }
             done++
             summary.uploaded++
-          summary.bytes += entry.size || 0
+            // the byte counters already moved while the file was read; the
-          barBytes += entry.size || 0
+            // completion still has to push the file count next
             emit('copy', unit, allDone + done, allTotal + pending.length)
           }
           if (typeof api.mapLimit === 'function') await api.mapLimit(pending, UPLOAD_CONCURRENCY, send)
           else for (const entry of pending) await send(entry)
           if (failed) throw failed
-        emit('copy', unit, allDone + done, allTotal + pending.length, true)
+          // A dead receiver made `send` skip files; committing now would prune
+          // exactly the files that never arrived (the commit itself could even
+          // succeed while only the heartbeats were failing).
+          if (abort.dead) throw new Error('receiver-lost')
+        }
+        emit('copy', unit, allDone + pending.length, allTotal + pending.length, true)
         // the totals count a unit's files only once they are on the wire
         allDone += pending.length
         allTotal += pending.length
         const commit = await httpJson(device, 'POST', `/plwl/unit/commit?token=${encodeURIComponent(token)}&unit=${encodeURIComponent(unit.key)}`, { json: {} })
-        if (commit.data && commit.data.deleted) {
+        // a unit that did not commit (unknown unit, failed prune) must not be
-          summary.deleted += commit.data.deleted
+        // counted as done while the sync moves on to the registry
-          bucket.deleted += commit.data.deleted
+        if (!commit.data || !commit.data.ok) throw new Error((commit.data && commit.data.error) || `commit-${commit.status}`)
-        }
+        if (commit.data.deleted) summary.deleted += commit.data.deleted
         finished[kind] += 1
         // a finished unit leaves a finished bar behind, even one that sent none
         barTotal = barTotal || 1
@@ -424,25 +602,57 @@ function createPusher(api) {
         emit('commit', unit, null, null, true)
       }
       emit('registry', null, null, null, true)
-      const applied = await httpJson(device, 'POST', `/plwl/apply?token=${encodeURIComponent(token)}`, { json: buildRegistryPayload([...cats]), timeout: 60000 })
+      if (abort.dead) throw new Error('receiver-lost')
+      const applied = await httpJson(device, 'POST', `/plwl/apply?token=${encodeURIComponent(token)}`, { json: buildRegistryPayload([...cats], selection), timeout: 60000 })
       if (!applied.data || !applied.data.ok) throw new Error((applied.data && applied.data.error) || `http-${applied.status}`)
-      for (const key of ['apps', 'wines', 'prefixes']) {
-        const deleted = applied.data[key] && applied.data[key].deleted
-        if (deleted) summary[key].deleted += deleted
-      }
       if (applied.data.deleted) summary.deleted += applied.data.deleted
+      // Deletions wait for the receiver's approval; nothing is removed on a
+      // timeout, so a lost popup can only ever keep too much, never too little.
+      if (applied.data.review && applied.data.review.id) {
+        const outcome = await waitForReview(device, token, applied.data.review, emit, abort)
+        summary.deleted += outcome.deleted || 0
+        summary.kept += outcome.kept || 0
+      }
+      // a sync with nothing to send still ends with a full bar
+      barTotal = barTotal || 1
+      barBytes = barTotal
       emit('done', null, allDone, allTotal, true)
       await end()
+    }
+    try {
+      await Promise.race([runUnits(), abortPromise])
     } catch (err) {
+      abort.dead = true
       await end()
-      return fail(String((err && err.message) || err), summary, events)
+      return fail(String((err && err.message) || err), summary)
     } finally {
       clearInterval(heartbeat)
     }
-    return syncResult(true, null, summary, events)
+    return syncResult(true, null, summary)
   }
 
-  return { syncToDevice, buildUnits, buildRegistryPayload, CATEGORIES }
+  // Everything a selection can name, in the same ids buildUnits uses - the UI
+  // must never derive a unit key on its own.
+  function items() {
+    const all = { active: false, has: () => true }
+    return {
+      apps: library
+        .loadGames()
+        .filter(game => api.appCategory(game))
+        .map(game => ({
+          key: `app:${game.id}`,
+          name: game.name || game.id,
+          category: api.appCategory(game),
+          prefix: game.prefix || ''
+        })),
+      wines: wineUnits(all).map(unit => ({ key: unit.key, name: unit.label })),
+      prefixes: prefixUnits(all).map(unit => ({ key: unit.key, name: unit.label }))
+    }
+  }
+
+  // putFile is exposed for the stall tests (it is the piece that must never
+  // leave a request half-open)
+  return { syncToDevice, buildUnits, buildRegistryPayload, items, putFile, CATEGORIES }
 }
 
 module.exports = createPusher

src/library.js

@@ -38,6 +38,7 @@ function loadGames() {
       g[k] = usePrefix && isPrefixRel(g[k]) ? path.join(usePrefix, g[k]) : resolvePortablePath(g[k])
     }
     if (g.iconSource) g.iconSource = resolvePortablePath(g.iconSource)
+    if (g.isolation !== undefined) g.isolation = isolationMode(g.isolation)
     const ps = readPlaySeconds(g.id)
     if (ps != null) g.playSeconds = ps
   }
@@ -90,10 +91,6 @@ function appsUsingPrefix(name, running) {
   return (running || []).filter(r => (r.prefixes || []).includes(name))
 }
 
-function isPrefixInUse(name, running) {
-  return appsUsingPrefix(name, running).length > 0
-}
-
 // Only an exact match on a registered build counts.
 function isWineInUse(id, running) {
   if (!id || id === 'system') return false
@@ -108,6 +105,30 @@ function gamesFollowingDefault(running) {
   })
 }
 
+// `kind` is only ever written as 'linux'; a missing one is a Windows app.
+function isLinuxGame(game) {
+  return !!game && game.kind === 'linux'
+}
+
+// none = plain run, relaxed = whole host filesystem mounted writable, isolated
+// = the stock read-only profile, auto = relaxed where bwrap works.
+const ISOLATION_MODES = ['auto', 'none', 'relaxed', 'isolated']
+
+// One known mode, always: an unknown value would otherwise reach the runner and
+// pick a level nobody asked for.
+function isolationMode(value) {
+  return ISOLATION_MODES.includes(value) ? value : 'auto'
+}
+
+function sanitizeLinuxPatch(patch) {
+  if (!patch) return patch
+  const out = { ...patch }
+  if (out.kind !== undefined) out.kind = out.kind === 'linux' ? 'linux' : 'windows'
+  if (out.isolation !== undefined) out.isolation = isolationMode(out.isolation)
+  if (out.forceX11 !== undefined) out.forceX11 = !!out.forceX11
+  return out
+}
+
 function addGame(game) {
   const games = loadGames()
   games.push(game)
@@ -115,41 +136,79 @@ function addGame(game) {
   return game
 }
 
+// Prefix imports are pinned; their patch fields are ignored. One place, so a
+// batch update behaves exactly like a single one.
+function normalizeGamePatch(game, patch) {
+  if (!patch) return {}
+  const out = { ...patch }
+  if (game.importSource === 'prefix') {
+    delete out.prefix
+    delete out.importSource
+  }
+  return sanitizeLinuxPatch(out)
+}
+
 function updateGame(id, patch) {
   const games = loadGames()
   const g = games.find(x => x.id === id)
   if (!g) return null
-  // prefix imports are pinned; their patch fields are ignored
+  const clean = normalizeGamePatch(g, patch)
-  if (g.importSource === 'prefix' && patch) {
-    patch = { ...patch }
-    delete patch.prefix
-    delete patch.importSource
-  }
   // playSeconds lives in its own file; the registry mirrors it
-  if (patch.playSeconds !== undefined) writePlaySeconds(id, patch.playSeconds)
+  if (clean.playSeconds !== undefined) writePlaySeconds(id, clean.playSeconds)
-  Object.assign(g, patch)
+  Object.assign(g, clean)
   saveGames(games)
   return g
 }
 
+// Same patch semantics for many apps, one registry write (LAN sync settings).
+function updateGames(patches) {
+  const games = loadGames()
+  let changed = 0
+  for (const g of games) {
+    const patch = patches instanceof Map ? patches.get(g.id) : patches && patches[g.id]
+    if (!patch) continue
+    const clean = normalizeGamePatch(g, patch)
+    if (clean.playSeconds !== undefined) writePlaySeconds(g.id, clean.playSeconds)
+    Object.assign(g, clean)
+    changed++
+  }
+  if (changed) saveGames(games)
+  return changed
+}
+
 function clearPlaytime(id) {
   return updateGame(id, { playSeconds: 0, lastPlayed: 0 })
 }
 
+// The app's own folder - what was imported, never the folder holding the exe:
+// the working directory may have been pointed elsewhere in the properties.
+function appFolder(game) {
+  if (!game) return ''
+  if (game.path) return String(game.path)
+  return game.exePath ? path.dirname(game.exePath) : ''
+}
+
 // Delete a portable app's folder with measured progress.
 async function removeGame(id, onProgress) {
   const games = loadGames()
   const idx = games.findIndex(g => g.id === id)
   if (idx === -1) return false
   const g = games[idx]
-  if (g.imported && g.path && g.path.startsWith(DIRS.APPS)) {
+  const folder = appFolder(g)
+  if (g.imported && folder && (folder === DIRS.APPS || folder.startsWith(DIRS.APPS + path.sep))) {
     const emit = (phase, detail) => {
       if (onProgress) onProgress({ phase, label: g.name || id, ...detail })
     }
     const { treeSize, removeTree } = require('./fsutil')
     emit('count', { files: 0, bytes: 0 })
-    const total = await treeSize(g.path)
+    const total = await treeSize(folder)
-    await removeTree(g.path, p => emit('remove', { files: p.files, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+    await removeTree(folder, p => emit('remove', { files: p.files, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+  }
+  // icons and playtime belong to the entry, not to any prefix
+  for (const owned of [path.join(DIRS.DATA, 'icons', id), path.join(DIRS.DATA, 'appdata', id)]) {
+    try {
+      await fs.promises.rm(owned, { recursive: true, force: true })
+    } catch {}
   }
   // prefix imports: drop only the registry entry, never prefix files
   games.splice(idx, 1)
@@ -175,11 +234,12 @@ function newGameId() {
   return id
 }
 
-function newGame({ id, name, exePath, workdir, mode }) {
+function newGame({ id, name, exePath, workdir, mode, kind }) {
   return {
     id: id || newGameId(),
     name,
     mode,
+    kind: kind === 'linux' ? 'linux' : 'windows',
     path: workdir,
     exePath,
     workdir,
@@ -189,6 +249,10 @@ function newGame({ id, name, exePath, workdir, mode }) {
     dllOverrides: [],
     // Proton-only: UMU by default, or the build's steam.exe launcher
     disableUmu: false,
+    // Linux-only: none, relaxed, isolated, or auto (relaxed where bwrap works)
+    isolation: 'auto',
+    // Linux-only: force XWayland, where a window can still carry its icon
+    forceX11: false,
     env: {},
     iconSource: '',
     playSeconds: 0,
@@ -228,8 +292,4 @@ function renamePrefixRefs(oldName, newName) {
   return updated
 }
 
-function resolvePrefixDir(game) {
+module.exports = { loadGames, saveGames, portableGame, appFolder, getGame, isLinuxGame, addGame, updateGame, updateGames, removeGame, reorderGames, renamePrefixRefs, prefixNameForGame, gamesUsingPrefix, appsUsingPrefix, isWineInUse, gamesFollowingDefault, loadSettings, saveSettings, newGame, newGameId, clearPlaytime, readPlaySeconds, writePlaySeconds, playtimeFile }
-  return prefixPath(prefixNameForGame(game))
-}
-
-module.exports = { loadGames, saveGames, portableGame, getGame, addGame, updateGame, removeGame, reorderGames, renamePrefixRefs, prefixNameForGame, gamesUsingPrefix, appsUsingPrefix, isPrefixInUse, isWineInUse, gamesFollowingDefault, loadSettings, saveSettings, newGame, newGameId, resolvePrefixDir, clearPlaytime, readPlaySeconds, writePlaySeconds, playtimeFile }

src/linuxapp.js

@@ -0,0 +1,260 @@
+'use strict'
+
+// What makes a file a runnable native Linux app: an ELF binary or an AppImage
+// (both with the executable bit), or a .desktop entry pointing at one.
+
+const fs = require('fs')
+const fsp = fs.promises
+const os = require('os')
+const path = require('path')
+
+const ELF_MAGIC = Buffer.from([0x7f, 0x45, 0x4c, 0x46])
+
+// Folders that ship libraries/data, never the entry point. Skipping them is
+// what keeps `share/` and `lib/` .desktop files out of the candidates.
+const SKIPPED_DIRS = new Set([
+  'lib', 'lib32', 'lib64', 'libexec', 'share', 'include', 'man', 'doc', 'docs',
+  'locale', 'node_modules', 'redist', 'python', 'site-packages', '__pycache__',
+  'translations', 'resources', 'licenses', 'locale'
+])
+
+const LIBRARY_RE = /\.(so(\.\d+(\.\d+)*)?|a|o|py|pyc|jar|dll|dylib)$/i
+const SCRIPT_RE = /^(run|start|launch|play|app)\.sh$/i
+
+function isElfBuffer(buf) {
+  return !!buf && buf.length >= 4 && buf.subarray(0, 4).equals(ELF_MAGIC)
+}
+
+function isElfSync(file) {
+  try {
+    const fd = fs.openSync(file, 'r')
+    try {
+      const buf = Buffer.alloc(4)
+      fs.readSync(fd, buf, 0, 4, 0)
+      return isElfBuffer(buf)
+    } finally {
+      fs.closeSync(fd)
+    }
+  } catch {
+    return false
+  }
+}
+
+// [Desktop Entry] fields we care about; the first group wins, later groups
+// (Desktop Action ...) are ignored.
+function parseDesktopEntry(text) {
+  const entry = {}
+  let inEntry = false
+  for (const raw of String(text || '').split('\n')) {
+    const line = raw.trim()
+    if (line.startsWith('[')) {
+      inEntry = line === '[Desktop Entry]'
+      continue
+    }
+    if (!inEntry || !line || line.startsWith('#')) continue
+    const eq = line.indexOf('=')
+    if (eq <= 0) continue
+    const key = line.slice(0, eq).trim()
+    const value = line.slice(eq + 1).trim()
+    if (key === 'Exec' || key === 'Icon' || key === 'Path' || key === 'Name' || key === 'Type') {
+      if (!(key in entry)) entry[key] = value
+    }
+  }
+  return entry
+}
+
+function readDesktopEntry(file) {
+  try {
+    return parseDesktopEntry(fs.readFileSync(file, 'utf8'))
+  } catch {
+    return null
+  }
+}
+
+// Exec is a command line with field codes: the first token is the program.
+function execToken(exec) {
+  const m = String(exec || '').match(/"([^"]*)"|'([^']*)'|(\S+)/)
+  const token = m ? (m[1] ?? m[2] ?? m[3]) : ''
+  return token && !/^%[fFuUdDnNickvm]?$/.test(token) ? token : ''
+}
+
+// A .desktop's program, resolved against the entry's own folder. Relative
+// Exec= paths are common in app dirs; the spec says that is not allowed, so
+// the fallback is to the folder itself.
+function desktopExecPath(entry, desktopFile) {
+  const token = execToken(entry && entry.Exec)
+  if (!token) return ''
+  const dir = path.dirname(desktopFile)
+  const resolved = path.isAbsolute(token) ? token : path.resolve(dir, token)
+  try {
+    fs.accessSync(resolved)
+    return resolved
+  } catch {
+    const base = path.join(dir, path.basename(token))
+    try {
+      fs.accessSync(base)
+      return base
+    } catch {
+      return ''
+    }
+  }
+}
+
+function isExecutable(file) {
+  try {
+    return (fs.statSync(file).mode & 0o111) !== 0
+  } catch {
+    return false
+  }
+}
+
+async function sizeOf(file) {
+  try {
+    return (await fsp.stat(file)).size
+  } catch {
+    return 0
+  }
+}
+
+// Best entry point in an app folder: the same question findDefaultExe answers
+// for Windows, with ELF/AppImage/.desktop instead of .exe.
+async function findLinuxExe(dir) {
+  const candidates = []
+  const desktops = []
+  const walk = async (d, depth) => {
+    let entries
+    try {
+      entries = await fsp.readdir(d, { withFileTypes: true })
+    } catch {
+      return
+    }
+    const subdirs = []
+    for (const entry of entries) {
+      const full = path.join(d, entry.name)
+      if (entry.isDirectory()) {
+        if (!SKIPPED_DIRS.has(entry.name.toLowerCase())) subdirs.push([full, depth + 1])
+        continue
+      }
+      const lower = entry.name.toLowerCase()
+      if (lower.endsWith('.desktop')) {
+        desktops.push([full, depth])
+        continue
+      }
+      if (lower.endsWith('.appimage')) {
+        candidates.push({ file: full, depth, score: 100 })
+        continue
+      }
+      if (LIBRARY_RE.test(entry.name)) continue
+      if (SCRIPT_RE.test(entry.name)) {
+        candidates.push({ file: full, depth, score: 60 })
+        continue
+      }
+      if (isElfSync(full)) candidates.push({ file: full, depth, score: isExecutable(full) ? 55 : 40 })
+    }
+    await Promise.all(subdirs.map(([full, next]) => walk(full, next)))
+  }
+  await walk(dir, 0)
+
+  // A .desktop is the intended way in when it names a program in the tree.
+  for (const [full, depth] of desktops) {
+    const exec = desktopExecPath(readDesktopEntry(full), full)
+    if (exec) candidates.push({ file: exec, depth, score: 90 })
+  }
+  if (!candidates.length) return ''
+
+  let best = ''
+  let bestScore = -Infinity
+  for (const candidate of candidates) {
+    const size = await sizeOf(candidate.file)
+    // shallow wins, and between equals the bigger binary is the app
+    const score = candidate.score - candidate.depth * 5 + Math.min(size / 1000000, 20)
+    if (score > bestScore) {
+      bestScore = score
+      best = candidate.file
+    }
+  }
+  return best
+}
+
+// The .desktop that belongs to this program: one in the same folder, whose
+// Exec points at it (or the only one there).
+function desktopFileFor(exePath) {
+  const dir = path.dirname(exePath)
+  let names = []
+  try {
+    names = fs.readdirSync(dir).filter(n => n.toLowerCase().endsWith('.desktop'))
+  } catch {}
+  if (!names.length) {
+    try {
+      names = fs.readdirSync(path.join(dir, '..')).filter(n => n.toLowerCase().endsWith('.desktop'))
+    } catch {}
+    if (names.length) return path.join(dir, '..', names[0])
+    return ''
+  }
+  for (const name of names) {
+    const file = path.join(dir, name)
+    if (desktopExecPath(readDesktopEntry(file), file) === exePath) return file
+  }
+  return path.join(dir, names[0])
+}
+
+function pngOrSvg(file) {
+  try {
+    const fd = fs.openSync(file, 'r')
+    try {
+      const buf = Buffer.alloc(64)
+      const read = fs.readSync(fd, buf, 0, 64, 0)
+      const head = buf.subarray(0, read)
+      if (head.length >= 8 && head.readUInt32BE(0) === 0x89504e47) return 'png'
+      const text = head.toString('utf8').trim().toLowerCase()
+      if (text.startsWith('<svg') || text.startsWith('<?xml')) return 'svg'
+      if (head.length >= 3 && head[0] === 0xff && head[1] === 0xd8) return 'jpg'
+    } finally {
+      fs.closeSync(fd)
+    }
+  } catch {}
+  return ''
+}
+
+const THEME_SIZES = ['512x512', '256x256', '128x128', 'scalable', '64x64', '48x48', '32x32']
+
+// An `Icon=` value: an absolute path, a path relative to the .desktop's
+// folder (AppImage app dirs put .DirIcon next to it), or a theme icon name.
+function findIconFile(spec, baseDir) {
+  const candidates = []
+  const name = String(spec || '').trim() || '.DirIcon'
+  if (path.isAbsolute(name)) {
+    candidates.push(name)
+  } else {
+    if (baseDir) candidates.push(path.join(baseDir, name))
+    if (!path.extname(name)) {
+      const dataHome = process.env.XDG_DATA_HOME || path.join(os.homedir(), '.local', 'share')
+      for (const dir of [path.join(dataHome, 'icons'), '/usr/share/icons']) {
+        for (const size of THEME_SIZES) {
+          for (const ext of ['png', 'svg']) candidates.push(path.join(dir, 'hicolor', size, 'apps', `${name}.${ext}`))
+        }
+      }
+      for (const dir of [dataHome, '/usr/share', '/usr/local/share']) {
+        candidates.push(path.join(dir, 'pixmaps', name + '.png'), path.join(dir, 'pixmaps', name + '.svg'))
+      }
+    } else {
+      for (const dir of ['/usr/share/pixmaps', process.env.XDG_DATA_HOME ? path.join(process.env.XDG_DATA_HOME, 'pixmaps') : '']) {
+        if (dir) candidates.push(path.join(dir, name))
+      }
+    }
+  }
+  for (const candidate of candidates) {
+    if (!candidate) continue
+    const kind = pngOrSvg(candidate)
+    if (kind) return candidate
+  }
+  return ''
+}
+
+module.exports = {
+  findLinuxExe,
+  readDesktopEntry,
+  desktopFileFor,
+  findIconFile,
+  pngOrSvg
+}

src/linuxrunner.js

@@ -0,0 +1,641 @@
+'use strict'
+
+// Native Linux apps: the twin of runner.js. Same tracked spawn tail, but the
+// program runs directly (no wine) with a redirected home and, when bubblewrap
+// works, inside a namespace.
+
+const crypto = require('crypto')
+const fs = require('fs')
+const os = require('os')
+const path = require('path')
+const { DIRS, readJson, writeJson } = require('./paths')
+const { prefixPath, prefixLinuxRoot } = require('./prefixes')
+const { prefixNameForGame, loadSettings, appFolder } = require('./library')
+const i18n = require('./i18n')
+const { spawnTracked, parseArgs } = require('./runner')
+const { buildBwrapArgs, SHARE_ROOT, FS_ROOT } = require('./sandbox')
+const { PLWL_DIR, requestPath } = require('./openrelay')
+const { copyFileProgress } = require('./fsutil')
+
+const DATA_DIRS = ['home', 'config', 'data', 'cache', 'state']
+
+// host folder <-> in-sandbox XDG variable, so both backends set the same env
+const XDG_LAYOUT = {
+  XDG_CONFIG_HOME: ['config', '.config'],
+  XDG_DATA_HOME: ['data', path.join('.local', 'share')],
+  XDG_CACHE_HOME: ['cache', '.cache'],
+  XDG_STATE_HOME: ['state', path.join('.local', 'state')]
+}
+
+
+// Every folder the app is addressed by - the tree it was imported as, the one
+// it runs in, and the one its binary sits in (a bundle may keep that in bin/,
+// or start an app from a folder of its own) - each as stated and as it really
+// is, since an app imported from the home may sit behind a link of its own.
+function appShapes(game) {
+  const dirs = [game && game.path, game && game.workdir, game && game.exePath && path.dirname(game.exePath)]
+  const shapes = new Set()
+  for (const dir of dirs) {
+    if (!dir) continue
+    shapes.add(path.resolve(dir))
+    try {
+      shapes.add(fs.realpathSync(dir))
+    } catch {}
+  }
+  return [...shapes]
+}
+
+function writableAppDir(game) {
+  const dir = appFolder(game)
+  // realpathSync('') would answer with the cwd - never hand that out
+  if (!dir) return ''
+  let real
+  try {
+    real = fs.realpathSync(dir)
+    if (!fs.statSync(real).isDirectory()) return ''
+  } catch {
+    return ''
+  }
+  // launcher-owned folders: only an imported app may be written to
+  if (real.startsWith(DIRS.FILES + path.sep)) {
+    return real.startsWith(DIRS.APPS + path.sep) ? real : ''
+  }
+  if (real === '/') return ''
+  for (const system of SYSTEM_DIRS) {
+    if (real === system || real.startsWith(system + '/')) return ''
+  }
+  return real
+}
+
+function linuxUser() {
+  try {
+    return os.userInfo().username
+  } catch {
+    return process.env.USER || 'user'
+  }
+}
+
+// The names the app owns in its home: the redirected XDG folders and the
+// launcher's own folder. The host home never gets to shadow them.
+const OWNED_HOME_NAMES = new Set([PLWL_DIR, '.config', '.local', '.cache'])
+
+// The host home's own entries - what the desktop can hand an app (a drop from
+// the file manager, a file picked in a dialog). A link resolving nowhere is
+// not a path anything can be given, so it is skipped too.
+function hostHomeEntries() {
+  const home = os.homedir()
+  let names
+  try {
+    names = fs.readdirSync(home)
+  } catch {
+    return []
+  }
+  return names.filter(name => !OWNED_HOME_NAMES.has(name) && fs.existsSync(path.join(home, name)))
+}
+
+// The launcher's own links are the ones pointing into the relaxed view.
+function isFsRootLink(file) {
+  let target
+  try {
+    target = fs.readlinkSync(file)
+  } catch {
+    return false
+  }
+  return target.startsWith(FS_ROOT + path.sep)
+}
+
+function clearHomeRedirects(root) {
+  const dir = path.join(root, 'home')
+  let names
+  try {
+    names = fs.readdirSync(dir)
+  } catch {
+    return
+  }
+  for (const name of names) {
+    if (!isFsRootLink(path.join(dir, name))) continue
+    try {
+      fs.rmSync(path.join(dir, name), { force: true })
+    } catch {}
+  }
+}
+
+// Relaxed is the one level where the real filesystem is reachable (through
+// FS_ROOT) - and there the app's home is mounted over the real one, so a path
+// the desktop hands over names a folder the app cannot see. A link into that
+// view gives exactly those names back, at their real paths; the app's own
+// entries are never touched. No other level has a view to point at, so the
+// links come off again there - they would only dangle.
+// One name is never linked: the one the app's own folder sits under. A portable
+// bundle resolves itself with `readlink -f "$0"`, so a link there answers with
+// FS_ROOT - a path under /tmp - and Prism Launcher reads that as "Your instance
+// folder is in a temporary folder" on every start (measured in a real profile).
+function syncHomeRedirects(root, { relaxed, appDirs = [] }) {
+  clearHomeRedirects(root)
+  if (!relaxed) return []
+  const home = os.homedir()
+  const made = []
+  for (const name of hostHomeEntries()) {
+    const real = path.join(home, name)
+    if (appDirs.some(dir => dir === real || dir.startsWith(real + path.sep))) continue
+    const file = path.join(root, 'home', name)
+    if (fs.existsSync(file)) continue
+    try {
+      fs.symlinkSync(path.join(FS_ROOT, real), file)
+      made.push(name)
+    } catch {}
+  }
+  return made
+}
+
+function copyFromHost(src, dst, { refresh = false } = {}) {
+  try {
+    if (!refresh && fs.existsSync(dst)) return false
+    if (!fs.statSync(src).isFile()) return false
+    fs.mkdirSync(path.dirname(dst), { recursive: true })
+    fs.copyFileSync(src, dst)
+    return true
+  } catch {
+    return false
+  }
+}
+
+// With HOME redirected there is no pulse cookie, and everything through Pulse
+// comes up silent; copied once, then the app owns it.
+function seedPulseCookie(root) {
+  const dst = path.join(root, 'config', 'pulse', 'cookie')
+  const seeded = copyFromHost(path.join(os.homedir(), '.config', 'pulse', 'cookie'), dst)
+  if (seeded) {
+    try {
+      fs.chmodSync(dst, 0o600)
+    } catch {}
+  }
+}
+
+// The host's desktop preferences, not its data: without them Qt/GTK fall back
+// to their built-in light look (KDE's dark palette lives in kdeglobals).
+const DESKTOP_SEEDS = [
+  'kdeglobals',
+  'kdedefaults/kdeglobals',
+  'gtk-3.0/settings.ini',
+  'gtk-4.0/settings.ini',
+  'qt5ct/qt5ct.conf',
+  'qt6ct/qt6ct.conf',
+  'Trolltech.conf',
+  'user-dirs.dirs'
+]
+
+// The host's desktop *data* (fonts, icons, themes) is not copied but handed
+// over read-only: see buildBwrapArgs.
+const DATA_SHARES = ['fonts', 'icons', 'themes', 'color-schemes']
+
+// A clicked link is the host desktop's business: the association naming a
+// browser lives in the host's own home, so the URI goes to the host's portal.
+const PORTAL_BUS = 'org.freedesktop.portal.Desktop'
+const PORTAL_METHOD = 'org.freedesktop.portal.OpenURI.OpenURI'
+const OPEN_BINS = ['/usr/bin/xdg-open', '/bin/xdg-open', '/usr/local/bin/xdg-open']
+// Launcher-owned files in the redirected home (never mounted into a sandbox),
+// rewritten whenever they differ.
+const SHIM_NAME = 'xdg-open'
+const OPENER_NAME = 'open-url'
+const OPENER_DESKTOP = 'plwl-url-opener.desktop'
+const SHIM_REL = path.join('home', PLWL_DIR, SHIM_NAME)
+const OPENER_REL = path.join('home', PLWL_DIR, OPENER_NAME)
+const MIME_REL = path.join('config', 'mimeapps.list')
+const DESKTOP_REL = path.join('data', 'applications', OPENER_DESKTOP)
+// What an opened thing in an app resolves to. Nothing else about the app's
+// file types is touched: the rest of the MIME lists stay the system's.
+const OPEN_TYPES = ['x-scheme-handler/http', 'x-scheme-handler/https', 'text/html', 'x-scheme-handler/file', 'inode/directory']
+
+function hostShareDir() {
+  return path.join(os.homedir(), '.local', 'share')
+}
+
+function dataShares() {
+  return DATA_SHARES.map(name => path.join(hostShareDir(), name)).filter(dir => fs.existsSync(dir))
+}
+
+function readText(file) {
+  try {
+    return fs.readFileSync(file, 'utf8')
+  } catch {
+    return ''
+  }
+}
+
+function writeIfChanged(file, text, mode) {
+  try {
+    fs.mkdirSync(path.dirname(file), { recursive: true })
+    if (readText(file) !== text) fs.writeFileSync(file, text)
+    fs.chmodSync(file, mode)
+    return file
+  } catch {
+    return ''
+  }
+}
+
+// The one script both hand-offs run: xdg-open's stand-in inside a sandbox, and
+// what the seeded desktop entry starts. A scheme goes to the host's portal
+// (chooser included), a path to the request file the launcher watches - the
+// portal's answer is unreadable (development.md), the call is all we can trust.
+// Mounted over the app's own xdg-open as well: see bundleOpenMounts.
+function handOffScript({ hostHome, fsRoot, request }) {
+  const cases = [
+    `file://"$HOME") arg="file://${hostHome}" ;;`,
+    `file://"$HOME"/*) arg="file://${hostHome}\${arg#file://"$HOME"}" ;;`,
+    ...(fsRoot
+      ? [
+          `file://${FS_ROOT}) arg="file:///" ;;`,
+          `file://${FS_ROOT}/*) arg="file:///\${arg#file://${FS_ROOT}/}" ;;`
+        ]
+      : []),
+    `"$HOME") arg="${hostHome}" ;;`,
+    `"$HOME"/*) arg="${hostHome}\${arg#$HOME}" ;;`,
+    ...(fsRoot ? [`${FS_ROOT}) arg="/" ;;`, `${FS_ROOT}/*) arg="/\${arg#${FS_ROOT}/}" ;;`] : [])
+  ].join('\n  ')
+  return `#!/bin/sh
+# Written by PLWL: what an app opens belongs to the host desktop.
+arg="$1"
+
+# the bundle's own xdg-open answers to gio-launch-desktop too (its bin links the
+# two names to one file) and there the argument is not something to open but a
+# program to start, so that name goes straight back to the command line
+if [ "\${0##*/}" = "gio-launch-desktop" ]; then
+  export GIO_LAUNCHED_DESKTOP_FILE_PID=$$
+  exec "$@"
+fi
+
+[ -n "$arg" ] || exit 1
+
+# a flag is not something to open: Java probes for xdg-open by running it with
+# one, and handing that over would open garbage on the host desktop
+case "$arg" in
+  -*) exit 2 ;;
+esac
+
+# a link is the host portal's from here on; anything else falls back
+open_portal() {
+  command -v gdbus >/dev/null 2>&1 || return 1
+  gdbus call --session --dest ${PORTAL_BUS} \\
+    --object-path /org/freedesktop/portal/desktop \\
+    --method ${PORTAL_METHOD} "" "$1" "{}" >/dev/null 2>&1
+}
+
+# a local document is not the portal's business - it cannot see this path
+case "$arg" in
+  file:*) ;;
+  *://*|mailto:*) open_portal "$arg" && exit 0 ;;
+esac
+
+case "$arg" in
+  ${cases}
+esac
+
+printf '%s\\n' "$arg" > "${request}.part" && mv "${request}.part" "${request}" || exit 1
+`
+}
+
+// The stand-in for xdg-open inside the sandbox, and (same script) what the
+// seeded desktop entry runs: a browser started in here would be the wrong one,
+// with an empty profile growing inside the prefix.
+function writeUrlShim(root, opts) {
+  return writeIfChanged(path.join(root, SHIM_REL), handOffScript(opts), 0o755)
+}
+
+function writeUrlOpener(root, opts) {
+  return writeIfChanged(path.join(root, OPENER_REL), handOffScript(opts), 0o755)
+}
+
+// The entry's display name. A translation that is not loaded answers with its
+// own key, and that would end up in a chooser dialog, so it is never used.
+function linkOpenerName() {
+  const text = i18n.translate(loadSettings().language, 'sandbox.linkOpener')
+  return text === 'sandbox.linkOpener' ? 'PLWL' : text
+}
+
+// GIO resolves an URI in-process (gtk_show_uri, `gio open`) and would pick a
+// system browser in here: naming our opener the default for exactly these types
+// changes only its answer. GIO's own portal path is not reachable (it wants a
+// sandbox marker this launcher does not fake).
+function writeMimeSeed(root, home) {
+  const desktop = [
+    '[Desktop Entry]',
+    'Type=Application',
+    `Name=${linkOpenerName()}`,
+    `Exec="${path.join(home, PLWL_DIR, OPENER_NAME)}" %u`,
+    `MimeType=${OPEN_TYPES.join(';')};`,
+    'NoDisplay=true',
+    'Terminal=false',
+    ''
+  ].join('\n')
+  writeIfChanged(path.join(root, DESKTOP_REL), desktop, 0o644)
+  const mime = ['[Default Applications]', ...OPEN_TYPES.map(type => `${type}=${OPENER_DESKTOP};`), ''].join('\n')
+  return writeIfChanged(path.join(root, MIME_REL), mime, 0o644)
+}
+
+// A bundle ships an xdg-open wrapper in its own bin/ (sharun's) and that bin is
+// first in the app's PATH, so the wrapper - not /usr/bin - is what an app's
+// opens really reach. It dies before delegating whenever the caller closes the
+// child's streams, which is what Minecraft does right after Runtime.exec
+// (measured: SIGPIPE, and no hand-off at all), so the launcher's shim is
+// mounted over the bundle's own path as well. Names the bundle links to that
+// file (its gio-launch-desktop) are answered by the shim itself - bwrap will
+// not mount over a symlink, so they cannot be given a script of their own.
+function bundleOpenMounts({ appDir, shim }) {
+  if (!appDir || !shim) return []
+  const wrapper = path.join(appDir, 'bin', SHIM_NAME)
+  return fs.existsSync(wrapper) ? [{ source: shim, target: wrapper }] : []
+}
+
+// Everything an opened thing needs: the hand-off script, the association naming
+// it the default, and - in a sandbox - xdg-open replaced by the same script.
+function urlRouting({ root, home, sandboxed, fsRoot = false, appDir = '' }) {
+  const target = OPEN_BINS.find(bin => fs.existsSync(bin)) || ''
+  const opts = { hostHome: path.join(root, 'home'), fsRoot, request: requestPath(home) }
+  if (!writeUrlOpener(root, opts)) return null
+  writeMimeSeed(root, home)
+  const shim = sandboxed && target ? writeUrlShim(root, opts) : ''
+  return { target, shim, mounts: bundleOpenMounts({ appDir, shim }) }
+}
+
+function hashOf(file) {
+  try {
+    return crypto.createHash('sha1').update(fs.readFileSync(file)).digest('hex')
+  } catch {
+    return ''
+  }
+}
+
+// Hashes of what we seeded, kept in the prefix root: the app only ever sees
+// home/config/data/cache/state.
+const SEED_MARKER = '.seeded.json'
+
+// Keeps a seeded preference following the host while the copy is provably ours;
+// an app's own edit is never overwritten.
+function syncDesktopConfig(root) {
+  const hostConfig = path.join(os.homedir(), '.config')
+  const markerFile = path.join(root, SEED_MARKER)
+  const marker = readJson(markerFile, {})
+  let changed = false
+  for (const rel of DESKTOP_SEEDS) {
+    const src = path.join(hostConfig, rel)
+    const dst = path.join(root, 'config', rel)
+    const hostHash = hashOf(src)
+    if (!hostHash) continue
+    if (fs.existsSync(dst)) {
+      // only a marked copy is provably ours, and only while it is untouched
+      const current = hashOf(dst)
+      if (current !== marker[rel] || current === hostHash) continue
+    }
+    if (copyFromHost(src, dst, { refresh: true })) {
+      marker[rel] = hostHash
+      changed = true
+    }
+  }
+  if (changed) {
+    try {
+      writeJson(markerFile, marker)
+    } catch {}
+  }
+}
+
+// X11 access: a cookie is session state, not data, so XAUTHORITY is refreshed
+// rather than seeded once.
+function seedXauthority(root) {
+  copyFromHost(path.join(os.homedir(), '.Xauthority'), path.join(root, 'home', '.Xauthority'), { refresh: true })
+}
+
+// Everything this module copies in from the host, prefix-relative: the one
+// list a reset has to clear.
+function seededRelPaths() {
+  return [
+    ...DESKTOP_SEEDS.map(rel => path.join('config', rel)),
+    path.join('config', 'pulse', 'cookie'),
+    path.join('home', '.Xauthority'),
+    SEED_MARKER
+  ]
+}
+
+// Drops what we seeded (and the hashes tracking it) so the next start seeds
+// clean ones; the app's own files in the same folders are never touched.
+function resetSeededConfig(name) {
+  const root = prefixLinuxRoot(name)
+  const removed = []
+  for (const rel of seededRelPaths()) {
+    const file = path.join(root, rel)
+    try {
+      // lstat: a link pointing out of the prefix is none of our business
+      if (!fs.lstatSync(file).isFile()) continue
+      fs.rmSync(file, { force: true })
+      removed.push(rel)
+    } catch {}
+  }
+  // folders that exist only for a seed, and only while nothing else lives there
+  const dirs = ['kdedefaults', 'gtk-3.0', 'gtk-4.0', 'qt5ct', 'qt6ct', 'pulse']
+  for (const dir of dirs) {
+    try {
+      fs.rmdirSync(path.join(root, 'config', dir))
+    } catch {}
+  }
+  return { ok: true, removed }
+}
+
+function ensureLinuxPfx(name) {
+  const root = prefixLinuxRoot(name)
+  fs.mkdirSync(path.join(root, 'home', '.local', 'share'), { recursive: true })
+  for (const dir of DATA_DIRS) fs.mkdirSync(path.join(root, dir), { recursive: true })
+  seedPulseCookie(root)
+  seedXauthority(root)
+  return root
+}
+
+// XWayland is the only place a window can carry its own icon, and GLFW/Qt/GTK
+// all read these, so one switch moves the whole process tree back to X11.
+const X11_ENV = { XDG_SESSION_TYPE: 'x11', QT_QPA_PLATFORM: 'xcb', GDK_BACKEND: 'x11' }
+
+// The theme data sits in front of the inherited list: on the host the user's
+// own icons and fonts also win over the system ones.
+function withHostShare(env, entries) {
+  const own = entries.filter(Boolean)
+  if (!own.length) return
+  env.XDG_DATA_DIRS = [...own, env.XDG_DATA_DIRS].filter(Boolean).join(':')
+}
+
+// HOME and the XDG folders point at the prefix (plain run) or at the bind
+// targets inside the sandbox - the two must agree or the app writes outside.
+function buildLinuxEnv({ game, backend = 'env', fsRoot = false }) {
+  const prefixName = prefixNameForGame(game)
+  const root = ensureLinuxPfx(prefixName)
+  syncDesktopConfig(root)
+  const homeRedirects = syncHomeRedirects(root, { relaxed: backend === 'bwrap' && fsRoot, appDirs: appShapes(game) })
+  const sandboxed = backend === 'bwrap'
+  const home = sandboxed ? `/home/${linuxUser()}` : path.join(root, 'home')
+  const env = { ...process.env }
+  env.HOME = home
+  for (const [key, [hostDir, sandboxSub]] of Object.entries(XDG_LAYOUT)) {
+    env[key] = sandboxed ? path.join(home, sandboxSub) : path.join(root, hostDir)
+  }
+  // The X session manager sits in the private /tmp, so its pointer would lead
+  // to a dead socket. XDG_RUNTIME_DIR stays the host's (it weakens isolation).
+  if (sandboxed) delete env.SESSION_MANAGER
+  // the host's fonts/icons/themes: mounted read-only by buildBwrapArgs, or - in
+  // a plain run, where nothing is hidden - just put on the search path
+  if (dataShares().length) withHostShare(env, [sandboxed ? SHARE_ROOT : hostShareDir()])
+  if (game.forceX11) Object.assign(env, X11_ENV)
+  // the app's own environment comes last: it overrides everything above
+  for (const [k, v] of Object.entries(game.env || {})) env[k] = v
+  // an opened link or document leaves for the host desktop (see openrelay.js)
+  return { env, root, home, prefixName, prefixDir: prefixPath(prefixName), homeRedirects, routing: urlRouting({ root, home, sandboxed, fsRoot, appDir: writableAppDir(game) }) }
+}
+
+// Where a handed document goes inside the app's own home - a live bind, so a
+// copy written here reaches an app that is already running too.
+const HANDOFF_DIR = 'plwl-handoff'
+// Copies above this are worth a popup: below it the copy is over before a
+// window could paint, and the launcher would flash for nothing.
+const STAGE_NOTICE_BYTES = 50 * 1000 * 1000
+
+// Awaited because a shortcut boots HEADLESS: without a measurement "auto" would
+// quietly pick the weaker level.
+async function levelStatus(sandbox) {
+  if (!sandbox || typeof sandbox.status !== 'function') return null
+  const cached = sandbox.status()
+  if (cached) return cached
+  if (typeof sandbox.probe !== 'function') return null
+  try {
+    return await sandbox.probe()
+  } catch {
+    return null
+  }
+}
+
+// `auto` is the only level that may weaken itself: a machine without bwrap runs
+// the app plain, while an explicit relaxed/isolated refuses instead.
+async function resolveLevel({ game, sandbox }) {
+  const policy = (game && game.isolation) || 'auto'
+  const status = await levelStatus(sandbox)
+  const available = !!status && status.backend === 'bwrap'
+  if (policy === 'none') return { ok: true, level: 'none', backend: 'env', status }
+  if (policy === 'auto') {
+    return { ok: true, level: available ? 'relaxed' : 'none', backend: available ? 'bwrap' : 'env', status }
+  }
+  if (!available) return { ok: false, error: 'sandbox-required', level: policy, backend: 'env', status }
+  return { ok: true, level: policy, backend: 'bwrap', status }
+}
+
+// The line the app log and the UI both quote: a silent downgrade is the one
+// failure this whole setting exists to avoid.
+function isolationLine({ level, status }) {
+  const version = (status && status.version) || ''
+  if (level === 'none') {
+    const reason = (status && status.reason) || ''
+    return reason ? `[plwl] isolation: none (no sandbox: ${reason})` : '[plwl] isolation: none (plain run)'
+  }
+  const bwrap = version ? `bwrap ${version}` : 'bwrap'
+  if (level === 'relaxed') return `[plwl] isolation: relaxed (${bwrap}, host filesystem at ${FS_ROOT})`
+  return `[plwl] isolation: isolated (${bwrap})`
+}
+
+// "Open with": a native app takes the file where it is (the sandbox sees /).
+function linuxPathFor(file) {
+  let abs = String(file || '')
+  try {
+    abs = fs.realpathSync(abs)
+  } catch {}
+  return abs
+}
+
+// The document a shortcut was handed, in the shape the chosen level can reach:
+// none = the host path, relaxed = through FS_ROOT, isolated = a copy in the
+// app's own home (refreshed on every open). '' when there is nothing to hand over.
+async function handedPathFor({ openFile, level, root, home, onProgress }) {
+  if (!openFile) return ''
+  const abs = linuxPathFor(openFile)
+  if (level === 'relaxed') return path.join(FS_ROOT, abs)
+  if (level !== 'isolated') return abs
+
+  const name = path.basename(abs)
+  if (!name || name === '.' || name === '..') return ''
+  const stat = fs.statSync(abs)
+  if (!stat.isFile()) return ''
+  const total = stat.size
+  const notice = total >= STAGE_NOTICE_BYTES
+  const emit = (phase, bytes, error) => {
+    if (onProgress) onProgress({ phase, name, bytes: bytes || 0, totalBytes: total, notice, error: error || '' })
+  }
+  emit('copy', 0)
+  try {
+    await copyFileProgress(abs, path.join(root, 'home', HANDOFF_DIR, name), p => emit('copy', p.bytes))
+  } catch (err) {
+    emit('error', 0, String((err && err.message) || err))
+    throw err
+  }
+  emit('done', total)
+  return path.join(home, HANDOFF_DIR, name)
+}
+
+function bwrapSource() {
+  const devices = ['/dev/shm', '/dev/dri', '/dev/snd', '/dev/input'].filter(d => fs.existsSync(d))
+  const x11 = fs.existsSync('/tmp/.X11-unix') ? '/tmp/.X11-unix' : ''
+  const runUser = `/run/user/${typeof process.getuid === 'function' ? process.getuid() : 0}`
+  return {
+    devices,
+    x11,
+    runUser: fs.existsSync(runUser) ? runUser : '',
+    shares: dataShares(),
+    user: linuxUser()
+  }
+}
+
+async function runLinuxGame({ game, sandbox, onExit, openFile, handoff = false, onProgress }) {
+  const chosen = await resolveLevel({ game, sandbox })
+  if (!chosen.ok) throw new Error(chosen.error)
+
+  const exe = game.exePath
+  const workdir = game.workdir || path.dirname(exe)
+  const { env, root, home, homeRedirects, routing } = buildLinuxEnv({ game, backend: chosen.backend, fsRoot: chosen.level === 'relaxed' })
+  const argList = parseArgs(game.args)
+  const handed = await handedPathFor({ openFile, level: chosen.level, root, home, onProgress })
+  if (handed) argList.push(handed)
+
+  const header = [isolationLine(chosen)]
+  if (homeRedirects.length) header.push(`[plwl] home redirects: ${homeRedirects.length} entries through ${FS_ROOT}`)
+  if (game.forceX11) header.push('[plwl] x11 forced (XWayland)')
+
+  let cmd = exe
+  let args = argList
+  if (chosen.backend === 'bwrap') {
+    const source = bwrapSource()
+    cmd = 'bwrap'
+    args = [...buildBwrapArgs({ dataRoot: root, user: source.user, devices: source.devices, x11: source.x11, runUser: source.runUser, shares: source.shares, appDir: writableAppDir(game), fsRoot: chosen.level === 'relaxed', urlOpener: routing }), '--', exe, ...argList]
+    header.push(`[plwl] HOME=${env.HOME}`)
+  }
+
+  return spawnTracked({ game, cmd, args, cwd: workdir, env, handoff, header, onExit })
+}
+
+module.exports = {
+  DESKTOP_SEEDS,
+  hostHomeEntries,
+  syncHomeRedirects,
+  HANDOFF_DIR,
+  STAGE_NOTICE_BYTES,
+  SHIM_REL,
+  OPENER_REL,
+  MIME_REL,
+  DESKTOP_REL,
+  writeUrlShim,
+  writeUrlOpener,
+  writeMimeSeed,
+  urlRouting,
+  writableAppDir,
+  ensureLinuxPfx,
+  resetSeededConfig,
+  dataShares,
+  buildLinuxEnv,
+  resolveLevel,
+  isolationLine,
+  handedPathFor,
+  runLinuxGame,
+  appShapes
+}

src/main.js

@@ -9,6 +9,7 @@ const { createMainWindow } = require('./window')
 const { setAppIcon } = require('./appicon')
 const { parseArgv } = require('./argv')
 const openwith = require('./openwith')
+const { createOpenRelay } = require('./openrelay')
 const lansync = require('./lansync')
 const path = require('path')
 const fs = require('fs')
@@ -154,6 +155,15 @@ function loadLangSafe() {
   }
 }
 
+// An isolated hand-off copies the document before the app starts. When that
+// copy is big enough to be noticed (linuxrunner decides) the user gets a
+// window with the progress in it - a shortcut boots headless, so without this
+// a 2 GB document would look like nothing happening at all.
+function onHandoffProgress(data) {
+  if (!data || !data.notice || data.phase !== 'copy') return
+  if (!win || win.isDestroyed() || !win.isVisible()) showMainWindow()
+}
+
 function showMainWindow() {
   // the user is present now - headless auto-quit must never fire again
   headless = false
@@ -226,7 +236,10 @@ app.whenReady().then(async () => {
   ensureDirs()
   await i18n.init()
   await wines.refreshWines()
-  const { games } = registerIpc({ getWindow, onGamesChanged: rebuildTrayMenu })
+  // a folder or document a sandboxed app asked for is opened here, by the
+  // host's own xdg-open (see openrelay.js)
+  const openRelay = createOpenRelay({ onError: (err, target) => trace(`openRelay ${target}: ${err.message}`) })
+  const { games } = registerIpc({ getWindow, onGamesChanged: rebuildTrayMenu, onHandoffProgress, openRelay })
   gamesService = games
 
   // the tray comes first: nothing may keep it from coming up
@@ -239,10 +252,24 @@ app.whenReady().then(async () => {
     onReceive: info => sendToWindow(win, 'lansync:receiving', info),
     // the consent popup for an incoming sync (see ipc/lansync.js)
     onIncoming: info => sendToWindow(win, 'lansync:incoming', info),
-    isBusy: () => !!(gamesService && gamesService.listRunning().length)
+    // the deletion review: nothing is removed without this popup's answer. No
+    // window (headless boot, or it went away) means "keep everything".
+    onReview: info => {
+      if (!win || win.isDestroyed()) return false
+      if (!win.isVisible()) win.show()
+      win.focus()
+      sendToWindow(win, 'lansync:review', info)
+      return true
+    },
+    // a device mid-push cannot also show a receive review
+    isBusy: () => !!(gamesService && gamesService.listRunning().length) || lansync.isPushing()
   }
   try {
-    Promise.resolve(lansync.start(lanHooks)).catch(err => {
+    Promise.resolve(lansync.start(lanHooks))
+      .then(info => {
+        if (!info || !info.ok) console.error(`[lansync] server not started: ${(info && info.error) || 'unknown'}`)
+      })
+      .catch(err => {
         console.error(`[lansync] start failed: ${(err && err.message) || err}`)
       })
   } catch (err) {

src/openrelay.js

@@ -0,0 +1,95 @@
+'use strict'
+
+// What a sandboxed app asked to open - a folder, a document, a path: nothing in
+// there can start a host program (measured), so the hand-off script leaves the
+// host-rewritten target in a request file inside the app's home (a live bind)
+// and the launcher opens it here with the host's own xdg-open.
+
+const fs = require('fs')
+const path = require('path')
+const { spawn } = require('child_process')
+
+// The hand-off protocol, in one place: the folder PLWL owns inside an app's home
+// (the shim and opener are written there too) and the file the launcher watches.
+const PLWL_DIR = '.plwl'
+const REQUEST_NAME = 'open-request'
+const DRAIN_DEBOUNCE_MS = 60
+
+// `homeDir` is that home as the host sees it: a live bind, so a write is here
+// the moment it lands.
+const requestPath = homeDir => path.join(homeDir, PLWL_DIR, REQUEST_NAME)
+const requestFile = root => requestPath(path.join(root, 'home'))
+
+// detached: the opened program is the desktop's child, and outlives a launcher
+// that quit to the tray
+function openOnHost(target) {
+  spawn('xdg-open', [target], { detached: true, stdio: 'ignore' }).unref()
+}
+
+function createOpenRelay({ open = openOnHost, onError = null } = {}) {
+  const watchers = new Map()
+
+  // consumed before it is opened: a second click overwrites the file, so nothing
+  // is opened twice and nothing is lost
+  function drain(root) {
+    let target = ''
+    try {
+      target = fs.readFileSync(requestFile(root), 'utf8').trim().split('\n')[0]
+      fs.rmSync(requestFile(root), { force: true })
+    } catch {
+      return
+    }
+    if (!target) return
+    try {
+      open(target)
+    } catch (err) {
+      if (onError) onError(err, target)
+    }
+  }
+
+  // Two apps can share one prefix (the default), so the watcher is refcounted:
+  // the first exit must not take the folder away from the app still running.
+  // A request written before the watcher was up (the app's first window) must
+  // not be missed, so drain once first.
+  function watch(root) {
+    if (!root) return
+    const existing = watchers.get(root)
+    if (existing) {
+      existing.refs++
+      return
+    }
+    const file = requestFile(root)
+    // best effort: a missing folder only means nothing was ever asked for
+    try {
+      fs.mkdirSync(path.dirname(file), { recursive: true })
+    } catch {}
+    let timer = null
+    const watcher = fs.watch(path.dirname(file), () => {
+      clearTimeout(timer)
+      timer = setTimeout(() => drain(root), DRAIN_DEBOUNCE_MS)
+    })
+    watcher.on('error', () => close(root))
+    watchers.set(root, { watcher, refs: 1 })
+    drain(root)
+  }
+
+  function close(root) {
+    const entry = watchers.get(root)
+    if (!entry) return
+    try {
+      entry.watcher.close()
+    } catch {}
+    watchers.delete(root)
+  }
+
+  function unwatch(root) {
+    const entry = watchers.get(root)
+    if (!entry) return
+    entry.refs--
+    if (entry.refs <= 0) close(root)
+  }
+
+  return { watch, unwatch, drain, requestFile }
+}
+
+module.exports = { createOpenRelay, PLWL_DIR, REQUEST_NAME, requestFile, requestPath }

src/openwith.js

@@ -24,25 +24,8 @@ function clearPending() {
   pending = null
 }
 
-// Fall back to English keys on older installs.
 function textsFor(code) {
-  let texts = {}
+  return require('./i18n').getLang(code).texts || {}
-  try {
-    texts = require('./i18n').getLang(code).texts || {}
-  } catch {}
-  const fallback = {
-    'openwith.title': 'Open with Wine',
-    'openwith.file': 'File',
-    'openwith.fileMissing': 'This file no longer exists.',
-    'openwith.wine': 'Wine / Proton version',
-    'openwith.wineDefault': 'Default ({0})',
-    'openwith.prefix': 'Wine prefix',
-    'openwith.prefixDefault': 'Default prefix ({0})',
-    'openwith.run': 'Run',
-    'openwith.startFailed': 'Could not start {0}: {1}',
-    'openwith.notWindows': 'This is not a Windows executable (exe/msi/bat/cmd/lnk).'
-  }
-  return { ...fallback, ...texts }
 }
 
 function resolveWine(id) {

src/paths.js

@@ -155,4 +155,4 @@ function writeJson(file, data) {
   fs.renameSync(tmp, file)
 }
 
-module.exports = { RESOURCES, APP_ROOT, BUILD, FILES, DATA, DIRS, ensureDirs, syncBundledTranslations, launcherIconPath, launcherIconDiskPath, readJson, writeJson, toPortablePath, resolvePortablePath }
+module.exports = { RESOURCES, APP_ROOT, BUILD, FILES, DATA, DIRS, ensureDirs, syncBundledTranslations, launcherIconPath, launcherIconDiskPath, readJson, writeJson, toPortablePath, resolvePortablePath, firstExisting }

src/prefixes.js

@@ -38,6 +38,14 @@ function prefixPath(name) {
   return path.join(DIRS.PREFIXES, name)
 }
 
+// Native Linux apps keep their redirected home/config/cache in here, next to
+// the Windows side of the same prefix.
+const LINUX_PFX = 'linux_pfx'
+
+function prefixLinuxRoot(name) {
+  return path.join(prefixPath(name), LINUX_PFX)
+}
+
 function prefixExists(name) {
   try {
     fs.accessSync(prefixPath(name))
@@ -100,6 +108,7 @@ function isPrefixRoot(p) {
     const root = prefixPath(entry.name)
     if (abs === root || abs === path.join(root, 'pfx')) return true
     if (abs === path.join(root, 'drive_c') || abs === path.join(root, 'pfx', 'drive_c')) return true
+    if (abs === path.join(root, LINUX_PFX) || abs === path.join(root, LINUX_PFX, 'home')) return true
   }
   return false
 }
@@ -122,15 +131,17 @@ function createPrefix(name) {
 async function deletePrefix(name, onProgress) {
   if (String(name).toLowerCase() === MAIN.toLowerCase()) return { ok: false, error: 'isMain' }
   const defs = listPrefixes()
-  defs.prefixes = defs.prefixes.filter(p => p.name !== name)
-  if (defs.default === name) defs.default = MAIN
-  savePrefixes(defs)
   const emit = (phase, detail) => {
     if (onProgress) onProgress({ phase, label: name, ...detail })
   }
   emit('count', { files: 0, bytes: 0 })
   const total = await treeSize(prefixPath(name))
   await removeTree(prefixPath(name), p => emit('remove', { files: p.files, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+  // the registry forgets it only once the folder is gone, so an interrupted
+  // delete stays visible and can be retried
+  defs.prefixes = defs.prefixes.filter(p => p.name !== name)
+  if (defs.default === name) defs.default = MAIN
+  savePrefixes(defs)
   return { ok: true }
 }
 
@@ -173,4 +184,4 @@ function setDefaultPrefix(name) {
   return { ok: true }
 }
 
-module.exports = { isPrefixRel, PREFIX_REL_RE, listPrefixes, savePrefixes, createPrefix, deletePrefix, renamePrefix, setDefaultPrefix, prefixPath, prefixExists, prefixDriveRoots, isPrefixRoot, healPrefix, ensureUnifiedPrefix, MAIN }
+module.exports = { isPrefixRel, PREFIX_REL_RE, LINUX_PFX, listPrefixes, savePrefixes, createPrefix, deletePrefix, renamePrefix, setDefaultPrefix, prefixPath, prefixLinuxRoot, prefixExists, prefixDriveRoots, isPrefixRoot, healPrefix, ensureUnifiedPrefix, MAIN }

src/preload.js

@@ -15,11 +15,15 @@ function singleSlot(channel) {
 }
 
 const onImportProgress = singleSlot('import:progress')
+// "Open with" into an isolated app: the document is copied first
+const onHandoffProgress = singleSlot('handoff:progress')
 // "Open with PLWL": files handed over via --open (Exec %f).
 const onOpenWith = singleSlot('openwith:file')
 // one sync (and one pending consent request, enforced server-side) at a time
 const onLanSyncProgress = singleSlot('lansync:progress')
 const onLanSyncIncoming = singleSlot('lansync:incoming')
+// the receiver's deletion review: an answer here decides what may be removed
+const onLanSyncReview = singleSlot('lansync:review')
 const fs = require('fs')
 const path = require('path')
 
@@ -41,6 +45,7 @@ contextBridge.exposeInMainWorld('plwl', {
   prefixesDelete: name => ipcRenderer.invoke('prefixes:delete', name),
   prefixesRename: (oldName, newName) => ipcRenderer.invoke('prefixes:rename', oldName, newName),
   prefixesSetDefault: name => ipcRenderer.invoke('prefixes:setDefault', name),
+  prefixesResetLinuxConfig: name => ipcRenderer.invoke('prefixes:resetLinuxConfig', name),
   openwithTake: () => ipcRenderer.invoke('openwith:take'),
   openwithRun: payload => ipcRenderer.invoke('openwith:run', payload),
   openwithTexts: lang => ipcRenderer.invoke('openwith:texts', lang),
@@ -68,7 +73,10 @@ contextBridge.exposeInMainWorld('plwl', {
   gamesShortcutPaths: id => ipcRenderer.invoke('games:shortcutPaths', id),
   gamesPickFolder: () => ipcRenderer.invoke('games:pickFolder'),
   gamesPickPrefixFolder: prefix => ipcRenderer.invoke('games:pickPrefixFolder', prefix),
-  gamesImport: (src, mode) => ipcRenderer.invoke('games:import', src, mode),
+  gamesImport: (src, mode, kind) => ipcRenderer.invoke('games:import', src, mode, kind),
+  gamesOpenDataFolder: id => ipcRenderer.invoke('games:openDataFolder', id),
+  sandboxStatus: () => ipcRenderer.invoke('sandbox:status'),
+  sandboxProbe: () => ipcRenderer.invoke('sandbox:probe'),
   gamesImportFromPrefix: (prefix, src) => ipcRenderer.invoke('games:importFromPrefix', prefix, src),
   gamesRun: id => ipcRenderer.invoke('games:run', id),
   gamesRunTool: (id, tool, args) => ipcRenderer.invoke('games:runTool', id, tool, args),
@@ -80,6 +88,7 @@ contextBridge.exposeInMainWorld('plwl', {
   shellOpenPath: p => ipcRenderer.invoke('shell:openPath', p),
   shellShowItemInFolder: p => ipcRenderer.invoke('shell:showItemInFolder', p),
   onImportProgress: onImportProgress,
+  onHandoffProgress: onHandoffProgress,
   onGamesChanged: cb => ipcRenderer.on('games:changed', () => cb()),
   lansyncGet: () => ipcRenderer.invoke('lansync:get'),
   lansyncDevices: () => ipcRenderer.invoke('lansync:devices'),
@@ -89,6 +98,10 @@ contextBridge.exposeInMainWorld('plwl', {
   lansyncClearHashCache: () => ipcRenderer.invoke('lansync:clearHashCache'),
   lansyncSync: payload => ipcRenderer.invoke('lansync:sync', payload),
   lansyncRespondIncoming: (requestId, accept) => ipcRenderer.invoke('lansync:respondIncoming', requestId, accept),
+  lansyncItems: () => ipcRenderer.invoke('lansync:items'),
+  lansyncReviewTree: (id, rel) => ipcRenderer.invoke('lansync:reviewTree', id, rel),
+  lansyncReviewDecide: (id, decision) => ipcRenderer.invoke('lansync:reviewDecide', id, decision),
+  onLanSyncReview: onLanSyncReview,
   onLanSyncDevices: cb => ipcRenderer.on('lansync:devices', (e, data) => cb(data)),
   onLanSyncProgress: onLanSyncProgress,
   onLanSyncIncoming: onLanSyncIncoming,

src/runner.js

@@ -88,28 +88,16 @@ async function healPrefixOnce(game) {
   }
 }
 
-// Proton's STEAM_COMPAT_DATA_PATH must be a symlink to the launcher prefix.
+// Proton's STEAM_COMPAT_DATA_PATH must be a symlink to the launcher prefix;
-// A leftover EMPTY compat dir (an older PLWL bug) is replaced by the link; a
+// a real compat dir already sitting there is not ours to replace.
-// populated one is left alone.
 function linkPrefix(compatData, prefixDir) {
   try {
     fs.mkdirSync(path.dirname(compatData), { recursive: true })
   } catch {}
   try {
-    const st = fs.lstatSync(compatData)
+    if (!fs.lstatSync(compatData).isSymbolicLink()) return
-    if (st.isSymbolicLink()) {
     if (fs.readlinkSync(compatData) === prefixDir) return
     fs.unlinkSync(compatData)
-    } else if (st.isDirectory()) {
-      let names = []
-      try {
-        names = fs.readdirSync(compatData)
-      } catch {}
-      if (names.length) return
-      fs.rmdirSync(compatData)
-    } else {
-      return
-    }
   } catch {}
   try {
     fs.symlinkSync(prefixDir, compatData, 'dir')
@@ -198,6 +186,10 @@ function windowsPathFor(file, prefixDir) {
 }
 
 const GRACE_MS = 60000
+// A finished run may leave output in the pipes (or a grandchild holding them
+// open): the log closes when its writers are done, at the latest this long
+// after the exit.
+const LOG_DRAIN_MS = 5000
 
 // Live playtime: tiny file updated every 30s, totals mirrored to the registry
 // on exit. `base` comes from the caller (live file, not the registry) so
@@ -222,32 +214,17 @@ function openLatestLog(gameId) {
   return fs.createWriteStream(logFile, { flags: 'w' })
 }
 
-async function runGame({ game, wine, systemWine, onExit, openFile, handoff = false }) {
+// The tail every tracked run shares (wine and native Linux alike): spawn
-  await healPrefixOnce(game)
+// detached, tee output into the app's latest log, tick playtime, stamp
-  const isProton = wine && wine.type === 'proton'
+// lastPlayed, report the exit. `header` lines land right after the launch line.
-  const { env, prefixDir } = buildEnv({ game, wine })
+function spawnTracked({ game, cmd, args, cwd, env, handoff = false, header = [], onExit }) {
-  const exe = game.exePath
+  const library = require('./library')
-  const workdir = game.workdir || path.dirname(exe)
-  const argList = parseArgs(game.args)
-  // an opened file is an argument to the exe, exactly like Windows' "Open with"
-  if (openFile) argList.push(windowsPathFor(openFile, prefixDir))
-
-  let cmd
-  let base
-  if (isProton) {
-    cmd = wine.wineBin || path.join(wine.path, 'proton')
-    base = [protonVerb(game), exe, ...argList]
-  } else {
-    cmd = systemWine ? 'wine' : wine.wineBin
-    base = [exe, ...argList]
-  }
-
   fs.mkdirSync(DIRS.DATA, { recursive: true })
   return new Promise((resolve, reject) => {
     let child
     try {
-      child = spawn(cmd, base, {
+      child = spawn(cmd, args, {
-        cwd: workdir,
+        cwd,
         env,
         // a handoff is untracked: its pipes drain so the app never blocks
         stdio: handoff ? 'ignore' : ['ignore', 'pipe', 'pipe'],
@@ -272,24 +249,36 @@ async function runGame({ game, wine, systemWine, onExit, openFile, handoff = fal
       const logFile = latestLogPath(game.id)
       const ws = openLatestLog(game.id)
       // a launch line first, so the log answers "which prefix/overrides/run"
-      ws.write(`[plwl] ${cmd} ${base.join(' ')}\n`)
+      ws.write(`[plwl] ${cmd} ${args.join(' ')}\n`)
-      ws.write(`[plwl] WINEPREFIX=${env.WINEPREFIX}\n`)
+      for (const line of header) ws.write(line + '\n')
-      if (env.WINEDLLOVERRIDES) ws.write(`[plwl] WINEDLLOVERRIDES=${env.WINEDLLOVERRIDES}\n`)
+      // two pipes feed one log, so neither may end it: pipe() would close the
-      if (isProton) ws.write(`[plwl] proton launcher: ${game.disableUmu ? 'direct wine (no UMU, no Steam)' : `umu.exe (UMU_ID=${env.UMU_ID})`}\n`)
+      // stream on the first EOF, and the second writer then kills the process
-      child.stdout.pipe(ws)
+      // with ERR_STREAM_WRITE_AFTER_END (an unhandled WriteStream 'error')
-      child.stderr.pipe(ws)
+      child.stdout.pipe(ws, { end: false })
+      child.stderr.pipe(ws, { end: false })
+      let openPipes = 2
+      const endLog = () => {
+        if (--openPipes <= 0) ws.end()
+      }
+      child.stdout.once('end', endLog)
+      child.stderr.once('end', endLog)
+      // an unwritable log (full disk, file removed) must not take us down
+      ws.on('error', () => {})
       child.unref()
       const startedAt = Date.now()
       // read the LIVE playtime file, not the registry (shared ids)
-      const basePlaySeconds = require('./library').readPlaySeconds(game.id) ?? (game.playSeconds || 0)
+      const basePlaySeconds = library.readPlaySeconds(game.id) ?? (game.playSeconds || 0)
       const stopTicker = startPlaytimeTicker({ game, startedAt, base: basePlaySeconds })
       // stamp "last played" once at start, even if we crash later
-      require('./library').updateGame(game.id, { lastPlayed: startedAt })
+      library.updateGame(game.id, { lastPlayed: startedAt })
       child.on('exit', (code, signal) => {
         stopTicker()
-        ws.end()
+        // nothing may outlive the run: end the log once the buffered output had
+        // its chance, even if something else still holds the pipes
+        const drain = setTimeout(() => ws.end(), LOG_DRAIN_MS)
+        if (drain.unref) drain.unref()
         const counted = Math.max(0, Math.round((Date.now() - startedAt - GRACE_MS) / 1000))
-        require('./library').updateGame(game.id, {
+        library.updateGame(game.id, {
           lastPlayed: startedAt,
           playSeconds: basePlaySeconds + counted
         })
@@ -300,6 +289,32 @@ async function runGame({ game, wine, systemWine, onExit, openFile, handoff = fal
   })
 }
 
+async function runGame({ game, wine, systemWine, onExit, openFile, handoff = false }) {
+  await healPrefixOnce(game)
+  const isProton = wine && wine.type === 'proton'
+  const { env, prefixDir } = buildEnv({ game, wine })
+  const exe = game.exePath
+  const workdir = game.workdir || path.dirname(exe)
+  const argList = parseArgs(game.args)
+  // an opened file is an argument to the exe, exactly like Windows' "Open with"
+  if (openFile) argList.push(windowsPathFor(openFile, prefixDir))
+
+  let cmd
+  let base
+  if (isProton) {
+    cmd = wine.wineBin || path.join(wine.path, 'proton')
+    base = [protonVerb(game), exe, ...argList]
+  } else {
+    cmd = systemWine ? 'wine' : wine.wineBin
+    base = [exe, ...argList]
+  }
+
+  const header = [`[plwl] WINEPREFIX=${env.WINEPREFIX}`]
+  if (env.WINEDLLOVERRIDES) header.push(`[plwl] WINEDLLOVERRIDES=${env.WINEDLLOVERRIDES}`)
+  if (isProton) header.push(`[plwl] proton launcher: ${game.disableUmu ? 'direct wine (no UMU, no Steam)' : `umu.exe (UMU_ID=${env.UMU_ID})`}`)
+  return spawnTracked({ game, cmd, args: base, cwd: workdir, env, handoff, header, onExit })
+}
+
 async function runTool({ game, wine, tool, args, systemWine }) {
   await healPrefixOnce(game)
   const isProton = wine && wine.type === 'proton'
@@ -336,4 +351,4 @@ function runAdHoc({ openPath, wine, systemWine, prefix, onExit }) {
   return runGame({ game, wine, systemWine, onExit })
 }
 
-module.exports = { buildEnv, runGame, runTool, runAdHoc, parseArgs, latestLogPath, windowsPathFor }
+module.exports = { buildEnv, runGame, runTool, runAdHoc, parseArgs, latestLogPath, windowsPathFor, spawnTracked }

src/sandbox.js

@@ -0,0 +1,166 @@
+'use strict'
+
+const { execFile } = require('child_process')
+const path = require('path')
+const { firstExisting } = require('./paths')
+
+// bwrap only works when unprivileged namespaces really work (Ubuntu's AppArmor
+// kills it), so a functional probe decides - never `which bwrap`.
+const PROBE_TIMEOUT_MS = 3000
+// /bin/true is a symlink on most distros but missing on a few; env is the
+// last resort that still exits 0.
+const TRUE_BINARIES = ['/bin/true', '/usr/bin/true', '/usr/bin/env']
+
+function firstLine(text) {
+  return String(text || '').trim().split('\n')[0].trim()
+}
+
+// A failed probe maps to a reason the UI and the log can name.
+function reasonFor(err, stderr) {
+  if (err && err.code === 'ENOENT') return 'missing'
+  if (err && (err.killed || err.signal === 'SIGKILL')) return 'timeout'
+  const text = String(stderr || '') + ' ' + String((err && err.message) || '')
+  if (/Operation not permitted|Permission denied|Failed to unshare|uid map|setting up uid|No permissions to create/i.test(text)) return 'not-permitted'
+  return 'failed'
+}
+
+function run(cmd, args, timeoutMs) {
+  return new Promise(resolve => {
+    execFile(cmd, args, { timeout: timeoutMs, killSignal: 'SIGKILL' }, (err, stdout, stderr) => {
+      resolve({ err, stdout: String(stdout || ''), stderr: String(stderr || '') })
+    })
+  })
+}
+
+// Status = { backend: 'bwrap' | 'env', version, reason, detail, checkedAt }
+// reason = null | 'missing' | 'not-permitted' | 'timeout' | 'failed'
+function createSandboxProbe({ timeoutMs = PROBE_TIMEOUT_MS } = {}) {
+  let cached = null
+  let inflight = null
+
+  const makeStatus = (backend, version, reason, detail) => ({
+    backend,
+    version: version || null,
+    reason: reason || null,
+    detail: detail || '',
+    checkedAt: Date.now()
+  })
+
+  async function measure() {
+    const trueBin = firstExisting(TRUE_BINARIES)
+    if (!trueBin) {
+      cached = makeStatus('env', null, 'missing', 'no /bin/true to probe with')
+      return cached
+    }
+    const versionRun = await run('bwrap', ['--version'], timeoutMs)
+    if (versionRun.err && versionRun.err.code === 'ENOENT') {
+      cached = makeStatus('env', null, 'missing', 'bubblewrap is not installed')
+      return cached
+    }
+    const version = firstLine(versionRun.stdout).split(/\s+/).pop() || null
+    const probeRun = await run('bwrap', ['--ro-bind', '/', '/', '--proc', '/proc', '--dev', '/dev', '--', trueBin], timeoutMs)
+    if (probeRun.err) {
+      cached = makeStatus('env', version, reasonFor(probeRun.err, probeRun.stderr), firstLine(probeRun.stderr) || firstLine(probeRun.err.message))
+      return cached
+    }
+    cached = makeStatus('bwrap', version, null, '')
+    return cached
+  }
+
+  // Runs the probe once and answers from the cache afterwards (3s on every
+  // launch click would be unacceptable).
+  function probe() {
+    if (cached) return Promise.resolve(cached)
+    if (!inflight) inflight = measure().finally(() => { inflight = null })
+    return inflight
+  }
+
+  return {
+    probe,
+    status: () => cached,
+    invalidate: () => { cached = null }
+  }
+}
+
+// Host theme data is mounted read-only here and listed in XDG_DATA_DIRS (inside
+// the private /tmp, where the app cannot mistake it for its own data). A bind,
+// not a symlink: the prefix is mounted over ~, so a link would point at itself.
+const SHARE_ROOT = '/tmp/.plwl-host'
+
+// Relaxed isolation mounts the whole host filesystem writable here. It takes
+// the private /tmp (bwrap creates the mount point itself) and one fixed string,
+// so a hand-off into an app that is ALREADY running resolves too.
+const FS_ROOT = '/tmp/plwl-fs-root'
+
+// The bwrap profile for a native Linux app. Pure: the caller decides which
+// devices and host folders exist, so the argv is testable as-is.
+function buildBwrapArgs({
+  dataRoot,
+  user,
+  home = `/home/${user}`,
+  uid = typeof process.getuid === 'function' ? process.getuid() : 0,
+  devices = [],
+  x11 = '',
+  runUser = '',
+  shares = [],
+  hideHome = false,
+  etcRoot = '',
+  unshareNet = false,
+  appDir = '',
+  fsRoot = false,
+  urlOpener = null
+}) {
+  const xdgDir = sub => path.join(home, sub)
+  return [
+    '--die-with-parent',
+    '--new-session',
+    // network stays: multiplayer and DNS keep working
+    '--unshare-all',
+    unshareNet ? '--unshare-net' : '--share-net',
+    '--hostname', 'plwl',
+    // --- filesystem ---
+    '--ro-bind', '/', '/',
+    '--proc', '/proc',
+    '--dev', '/dev',
+    ...devices.flatMap(device => ['--dev-bind', device, device]),
+    '--tmpfs', '/tmp',
+    // X11 sockets live in /tmp, which the tmpfs above just emptied
+    ...(x11 ? ['--ro-bind', x11, x11] : []),
+    // relaxed: the whole host filesystem, writable. Nothing is hidden, and the
+    // app may write anywhere on the machine - that is this level's price.
+    ...(fsRoot ? ['--bind', '/', FS_ROOT] : []),
+    // the host's theme data, read-only: fonts, icons, colour schemes
+    ...shares.flatMap(dir => ['--ro-bind', dir, path.join(SHARE_ROOT, path.basename(dir))]),
+    // an opened link or document belongs to the host desktop, so xdg-open is
+    // replaced by the launcher's hand-off script (linuxrunner.js)
+    ...(urlOpener && urlOpener.shim ? ['--ro-bind', urlOpener.shim, urlOpener.target] : []),
+    // hard profile: nothing of anybody's /home is even readable
+    ...(hideHome ? ['--tmpfs', '/home', '--tmpfs', '/root', '--tmpfs', '/mnt', '--tmpfs', '/media'] : []),
+    // --- app data (host paths bound to a fresh HOME) ---
+    '--bind', path.join(dataRoot, 'home'), home,
+    '--bind', path.join(dataRoot, 'config'), xdgDir('.config'),
+    '--bind', path.join(dataRoot, 'data'), xdgDir(path.join('.local', 'share')),
+    '--bind', path.join(dataRoot, 'cache'), xdgDir('.cache'),
+    '--bind', path.join(dataRoot, 'state'), xdgDir(path.join('.local', 'state')),
+    // Wayland, PipeWire, PulseAudio and the session bus all live here
+    ...(runUser ? ['--bind', runUser, runUser] : []),
+    ...(etcRoot ? ['--bind', etcRoot, '/etc'] : []),
+    // the app's own folder stays writable (portable apps keep logs/data next
+    // to themselves). Last, because an imported app lives under the host's home
+    // and the home bind above would otherwise mount over and hide it - bwrap
+    // then fails with "execvp <app>: No such file or directory".
+    ...(appDir ? ['--bind', appDir, appDir] : []),
+    // the bundle's own bin/ faces the shim too (see linuxrunner.js): its own
+    // xdg-open is what an app's PATH reaches first, so the hand-off script has
+    // to sit there as well. After the app bind, so the bundle is in place first.
+    ...(urlOpener && urlOpener.shim ? (urlOpener.mounts || []).flatMap(mount => ['--ro-bind', mount.source, mount.target]) : []),
+    // --- environment ---
+    '--setenv', 'HOME', home,
+    '--setenv', 'XDG_CONFIG_HOME', xdgDir('.config'),
+    '--setenv', 'XDG_DATA_HOME', xdgDir(path.join('.local', 'share')),
+    '--setenv', 'XDG_CACHE_HOME', xdgDir('.cache'),
+    '--setenv', 'XDG_STATE_HOME', xdgDir(path.join('.local', 'state'))
+  ]
+}
+
+module.exports = { createSandboxProbe, buildBwrapArgs, SHARE_ROOT, FS_ROOT }

src/wines.js

@@ -58,17 +58,8 @@ async function scanBuild(dir, depth) {
       path: dir,
       type
     }
-    if (type === 'proton') {
+    if (type === 'proton') entry.wineBin = path.join(dir, 'proton')
-      entry.wineBin = path.join(dir, 'proton')
+    else if (type === 'wine') entry.wineBin = findWineBinary(dir) || undefined
-    } else if (type === 'wine') {
-      const bin = findWineBinary(dir)
-      if (bin) {
-        entry.wineBin = bin
-        const ver = versionOf(bin, {})
-        if (ver) entry.version = ver
-      }
-    }
-    entry.label = labelFor(type, dir, entry.version)
     return [entry]
   }
   if (depth <= 0) return []
@@ -118,6 +109,13 @@ async function refreshWines() {
   // display name and disabled flag live in the registry and survive rescans
   const renamed = new Map(prev.filter(w => w.displayName).map(w => [w.id, w.displayName]))
   for (const w of found) {
+    const old = prevById.get(w.id)
+    // `wine --version` spawns a process; an unchanged build keeps its answer
+    if (w.type === 'wine' && w.wineBin) {
+      if (old && old.path === w.path && old.wineBin === w.wineBin && old.version) w.version = old.version
+      else w.version = versionOf(w.wineBin, {})
+    }
+    w.label = labelFor(w.type, w.path, w.version)
     if (disabled.has(w.id)) w.disabled = true
     if (renamed.has(w.id)) w.displayName = renamed.get(w.id)
     applyDisplayName(w)
@@ -161,23 +159,53 @@ function clearWineDisplayName(id) {
   return writeWineLabel(id, '')
 }
 
+// An empty label means "use the folder-derived one".
+function applyWineLabel(w, clean) {
+  if (clean) {
+    w.displayName = clean
+    w.label = clean
+    return
+  }
+  delete w.displayName
+  w.label = labelFor(w.type, w.path, w.version)
+}
+
 function writeWineLabel(id, clean) {
   const wines = getWines()
   const w = wines.find(x => x.id === id)
   if (!w) return { ok: false, error: 'notFound' }
   if (w.type === 'system') return { ok: false, error: 'isSystem' }
-  if (clean) {
+  if (!clean && !w.displayName) return { ok: true, displayName: '' }
-    w.displayName = clean
+  applyWineLabel(w, clean)
-    w.label = clean
-  } else {
-    if (!w.displayName) return { ok: true, displayName: '' }
-    delete w.displayName
-    w.label = labelFor(w.type, w.path, w.version)
-  }
   writeJson(REGISTRY, wines.map(wineRel))
   return { ok: true, displayName: clean }
 }
 
+// LAN sync: display names + disabled flags for many builds, one registry write.
+function applySettings(entries) {
+  const wines = getWines()
+  const byId = new Map(wines.map(w => [w.id, w]))
+  let applied = 0
+  for (const entry of entries) {
+    if (!entry || typeof entry.name !== 'string') continue
+    const wine = byId.get(entry.name)
+    if (!wine || wine.type === 'system') continue
+    let changed = false
+    const wanted = normalizeLabel(typeof entry.displayName === 'string' ? entry.displayName : '')
+    if (wanted !== (wine.displayName || '')) {
+      applyWineLabel(wine, wanted)
+      changed = true
+    }
+    if (entry.disabled !== undefined && !!entry.disabled !== !!wine.disabled) {
+      wine.disabled = !!entry.disabled
+      changed = true
+    }
+    if (changed) applied++
+  }
+  if (applied) writeJson(REGISTRY, wines.map(wineRel))
+  return applied
+}
+
 function setWineDisabled(id, disabled) {
   const wines = getWines()
   const w = wines.find(x => x.id === id)
@@ -219,6 +247,10 @@ async function deleteWine(id, onProgress) {
   emit('count', { files: 0, bytes: 0 })
   const total = await treeSize(w.path)
   await removeTree(w.path, p => emit('remove', { files: p.files, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+  // the Proton compat link points into data/, not into the build we just removed
+  try {
+    fs.unlinkSync(path.join(DIRS.DATA, 'compat', id))
+  } catch {} // no link (plain wine build) or already gone - both fine
   writeJson(REGISTRY, wines.filter(x => x.id !== id).map(wineRel))
   if (getDefaultWine() === id) require('./library').saveSettings({ defaultWine: 'system' })
   return { ok: true }
@@ -300,7 +332,12 @@ async function importWineFolder(srcDir, onProgress) {
   }
   emit('count', { files: 0, bytes: 0 })
   const total = await treeSize(copySrc)
-  await copyTree(copySrc, dst, p => emit('copy', { files: p.done, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+  const copied = await copyTree(copySrc, dst, p => emit('copy', { files: p.done, bytes: p.bytes, totalFiles: total.files, totalBytes: total.bytes }))
+  if (copied.failed) {
+    // a build missing files fails at the first Proton launch; do not register it
+    await fsp.rm(dst, { recursive: true, force: true })
+    throw new Error('copy-incomplete')
+  }
   let healed = { links: 0, executables: 0 }
   try {
     healed = await healBuild(dst)
@@ -310,14 +347,19 @@ async function importWineFolder(srcDir, onProgress) {
   return { ok: true, path: toPortablePath(dst), symlinksFixed: healed.links, executablesFixed: healed.executables }
 }
 
-// Pseudo entry for the distro's wine; version probe is best-effort.
+// Pseudo entry for the distro's wine; version probe is best-effort and cached:
+// this runs on every library refresh, and a synchronous spawn blocked the UI.
+let systemVersion = null
 function systemWine() {
-  let version = ''
+  if (systemVersion === null) {
     try {
       const { execFileSync } = require('child_process')
-    version = String(execFileSync('wine', ['--version'], { timeout: 15000 })).trim().replace(/^wine-?/i, '')
+      systemVersion = String(execFileSync('wine', ['--version'], { timeout: 15000 })).trim().replace(/^wine-?/i, '')
-  } catch {}
+    } catch {
-  return { id: 'system', type: 'system', label: 'System Wine', version }
+      systemVersion = ''
+    }
+  }
+  return { id: 'system', type: 'system', label: 'System Wine', version: systemVersion }
 }
 
-module.exports = { refreshWines, getWines, getWine, resolveWine, systemWine, setWineDisabled, setWineDisplayName, clearWineDisplayName, getDefaultWine, setDefaultWine, deleteWine, importWineFolder, findWineBinary, detectType, fixBuildSymlinks, healBuild }
+module.exports = { refreshWines, getWines, getWine, resolveWine, systemWine, setWineDisabled, setWineDisplayName, clearWineDisplayName, applySettings, getDefaultWine, setDefaultWine, deleteWine, importWineFolder, findWineBinary, detectType, fixBuildSymlinks, healBuild }