wine import auto-fix symlinks

src/wines.js

@@ -106,6 +106,17 @@ async function refreshWines() {
     found = []
   }
   const prev = readJson(REGISTRY, [])
+  const prevById = new Map(prev.map(w => [w.id, w]))
+  // A build whose path changed since last scan was moved (or the launcher
+  // itself was) - rewire its absolute symlinks to the current location.
+  for (const w of found) {
+    const old = prevById.get(w.id)
+    if (!old || old.path !== w.path) {
+      try {
+        await fixBuildSymlinks(w.path)
+      } catch {}
+    }
+  }
   const disabled = new Set(prev.filter(w => w.disabled).map(w => w.id))
   for (const w of found) if (disabled.has(w.id)) w.disabled = true
   const merged = [...found]
@@ -168,6 +179,84 @@ function dedupeDir(base, name) {
   return candidate
 }
 
+// --- symlink healing -------------------------------------------------------
+// Wine/Proton builds contain symlinks (e.g. inside the bundled default prefix)
+// that point to absolute paths from wherever the build lived before (zip
+// layout, previous install dir). After the build or the whole launcher is
+// moved those links dangle and Proton crashes during prefix setup
+// (try_copy -> FileNotFoundError). Rewire every absolute symlink whose content
+// can be located inside the build, always storing the new target as a
+// *relative* path so the build stays relocatable forever.
+async function collectSymlinks(dir, out) {
+  let entries
+  try {
+    entries = await fsp.readdir(dir, { withFileTypes: true })
+  } catch {
+    return
+  }
+  for (const e of entries) {
+    const full = path.join(dir, e.name)
+    if (e.isSymbolicLink()) {
+      out.push(full)
+    } else if (e.isDirectory() && e.name !== 'dosdevices') {
+      // dosdevices/ holds prefix drive mappings (c:, z:, ...) which are
+      // *supposed* to point outside the build - never touch them.
+      await collectSymlinks(full, out)
+    }
+  }
+}
+
+function rewireTarget(root, link, target) {
+  if (!path.isAbsolute(target)) return null // already relocatable
+  // Absolute link that lives inside the build: make it relative.
+  if (target.startsWith(root + path.sep)) {
+    return path.relative(path.dirname(link), target)
+  }
+  // Absolute link to an old location: find the longest suffix of the target
+  // that exists inside the new build and point there instead.
+  let i = target.indexOf(path.sep, 1)
+  while (i !== -1) {
+    const rel = target.slice(i + 1)
+    if (rel) {
+      const candidate = path.join(root, rel)
+      if (!rel.split(path.sep).includes('..') && candidate.startsWith(root + path.sep) && exists(candidate)) {
+        return path.relative(path.dirname(link), candidate)
+      }
+    }
+    i = target.indexOf(path.sep, i + 1)
+  }
+  return null
+}
+
+async function fixBuildSymlinks(root) {
+  const links = []
+  await collectSymlinks(root, links)
+  let fixed = 0
+  // A link may only become rewirable once another link it chains through has
+  // been fixed, so repeat until a full pass changes nothing.
+  for (let pass = 0; pass < 5; pass++) {
+    let changed = 0
+    for (const link of links) {
+      let target
+      try {
+        target = await fsp.readlink(link)
+      } catch {
+        continue
+      }
+      const newTarget = rewireTarget(root, link, path.normalize(target))
+      if (!newTarget || newTarget === target) continue
+      try {
+        await fsp.unlink(link)
+        await fsp.symlink(newTarget, link)
+        fixed++
+        changed++
+      } catch {}
+    }
+    if (!changed) break
+  }
+  return fixed
+}
+
 async function importWineFolder(srcDir) {
   const type = detectType(srcDir)
   let copySrc = srcDir
@@ -184,9 +273,13 @@ async function importWineFolder(srcDir) {
     }
   }
   const dst = dedupeDir(WINES_DIR, path.basename(copySrc))
-  await fsp.cp(copySrc, dst, { recursive: true })
+  await fsp.cp(copySrc, dst, { recursive: true, verbatimSymlinks: true })
+  let symlinksFixed = 0
+  try {
+    symlinksFixed = await fixBuildSymlinks(dst)
+  } catch {}
   await refreshWines()
-  return { ok: true, path: dst }
+  return { ok: true, path: dst, symlinksFixed }
 }
 
-module.exports = { refreshWines, getWines, getWine, setWineDisabled, getDefaultWine, setDefaultWine, deleteWine, importWineFolder, findWineBinary, detectType }
+module.exports = { refreshWines, getWines, getWine, setWineDisabled, getDefaultWine, setDefaultWine, deleteWine, importWineFolder, findWineBinary, detectType, fixBuildSymlinks }