opencode-desktop: fix empty window and missing desktop entry

- Patch prebuilt .node files (node-pty, @parcel/watcher) with
  autoPatchelfHook so they can dlopen libstdc++. Without this, the
  sidecar exits on startup because glibc does not consult electron's
  DT_RUNPATH transitively for dlopened libraries, and the renderer
  shows an empty window with no backend.
- Ignore unresolved libc.musl-* SONAMEs in the prebuilt .node files
  so autoPatchelfHook accepts them on glibc systems. The musl-targeting
  bindings are dead code at runtime on the host's libc anyway.
- Pass --config.asarUnpack='**/*.node' to electron-builder so every
  prebuilt native binding lands on the filesystem (not embedded in
  app.asar where dlopen cannot find them).
- Disable the auto-updater at source via postPatch. With the package
  now correctly identifying as packaged, the updater would otherwise
  try to download and run upstream binaries that aren't patched for
  Nix.
- Generate a .desktop entry via makeDesktopItem. electron-builder
  --dir skips the deb/AppImage/rpm stages that normally produce one,
  so copyDesktopItems on its own was a no-op.
- Install icons into share/icons/hicolor/{30,32,44,64,71,89,107,128,
  142,150,284,310}x*/apps/ mirroring upstream's deb layout, so desktop
  environments find them. Previously a single bare PNG at
  share/icons/opencode-desktop.png (not part of any icon theme path).
- Set ELECTRON_FORCE_IS_PACKAGED=1 in the wrapper. With
  --inherit-argv0, Electron's app.isPackaged heuristic returns false,
  which routes the app to the dev XDG dir and breaks the WM-class
  match with StartupWMClass=OpenCode.
- On darwin, symlink Contents/MacOS/OpenCode into $out/bin and set
  mainProgram accordingly so lib.getExe works on both platforms.
- Drop the unused opencode-cli sidecar copy; the bundled chunk hosts
  its own server and never spawns the CLI.

Assisted-by: OpenCode:claude-opus-4-7
Co-authored-by: typedrat <alexis@typedr.at>

pkgs/by-name/op/opencode-desktop/package.nix

@@ -1,12 +1,15 @@
 {
+  autoPatchelfHook,
   bun,
   copyDesktopItems,
   electron_41,
   lib,
   makeBinaryWrapper,
+  makeDesktopItem,
   models-dev,
   nodejs,
   opencode,
+  stdenv,
   stdenvNoCC,
   writableTmpDirAsHomeHook,
 
@@ -30,9 +33,20 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     nodejs # for patchShebangs node_modules
     makeBinaryWrapper
     writableTmpDirAsHomeHook
+  ]
+  ++ lib.optionals stdenvNoCC.hostPlatform.isLinux [
+    autoPatchelfHook
     copyDesktopItems
   ];
 
+  buildInputs = lib.optionals stdenvNoCC.hostPlatform.isLinux [
+    (lib.getLib stdenv.cc.cc)
+  ];
+
+  # The musl prebuilts ship libc.musl-*.so.1 SONAMEs that autoPatchelfHook can't
+  # resolve on glibc systems. They aren't loaded at runtime on the host libc anyway.
+  autoPatchelfIgnoreMissingDeps = [ "libc.musl-*.so.*" ];
+
   strictDeps = true;
 
   env = {
@@ -42,6 +56,13 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     OPENCODE_DISABLE_MODELS_FETCH = true;
   };
 
+  postPatch = ''
+    # The auto-updater would try to download and run an upstream binary that
+    # isn't patched for Nix. Disable it at source.
+    substituteInPlace packages/desktop/src/main/constants.ts \
+      --replace-fail 'app.isPackaged && CHANNEL !== "dev"' 'false'
+  '';
+
   configurePhase = ''
     runHook preConfigure
 
@@ -69,10 +90,6 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     # Build with electron-vite
     node_modules/.bin/electron-vite build
 
-    # Copy opencode CLI as sidecar
-    sidecar_name="opencode-cli"
-    install -D ${lib.getExe opencode} "resources/$sidecar_name"
-
     # Package with electron-builder (unpacked directory mode)
     cp -r "${electron.dist}" $HOME/.electron-dist
     chmod -R u+w $HOME/.electron-dist
@@ -80,53 +97,72 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     node_modules/.bin/electron-builder --dir \
       --config=electron-builder.config.ts \
       --config.electronDist="$HOME/.electron-dist" \
-      --config.electronVersion=${electron.version}
+      --config.electronVersion=${electron.version} \
+      --config.asarUnpack='**/*.node'
 
     cd ../..
 
     runHook postBuild
   '';
 
-  installPhase = ''
-    runHook preInstall
-  ''
-  + lib.optionalString stdenvNoCC.hostPlatform.isDarwin ''
-    mkdir -p $out/Applications
-    mv packages/desktop/dist/mac-*/OpenCode.app "$out/Applications/OpenCode.app"
-  ''
-  + lib.optionalString stdenvNoCC.hostPlatform.isLinux ''
-    mkdir -p $out/opt/opencode-desktop
-    ${
-      if stdenvNoCC.hostPlatform.isAarch64 then
-        ''
-          appDir="packages/desktop/dist/linux-arm64-unpacked"
-        ''
-      else
-        ''
-          appDir="packages/desktop/dist/linux-unpacked"
-        ''
-    }
-    [ -d "$appDir" ] || { echo "no electron-builder output dir found: $appDir"; exit 1; }
-    cp -r "$appDir/resources" $out/opt/opencode-desktop/
+  desktopItems = lib.optional stdenvNoCC.hostPlatform.isLinux (makeDesktopItem {
+    name = "opencode-desktop";
+    desktopName = "OpenCode";
+    exec = "opencode-desktop %U";
+    icon = "opencode-desktop";
+    startupWMClass = "OpenCode";
+    categories = [ "Development" ];
+    mimeTypes = [ "x-scheme-handler/opencode" ];
+  });
 
-    install -Dm644 packages/desktop/resources/icons/icon.png $out/share/icons/opencode-desktop.png
+  installPhase =
+    let
+      appDir = if stdenvNoCC.hostPlatform.isAarch64 then "linux-arm64-unpacked" else "linux-unpacked";
+    in
+    lib.concatLines [
+      ''
+        runHook preInstall
+      ''
+      (lib.optionalString stdenvNoCC.hostPlatform.isDarwin ''
+        mkdir -p $out/Applications $out/bin
+        mv packages/desktop/dist/mac-*/OpenCode.app "$out/Applications/OpenCode.app"
+        ln -s "$out/Applications/OpenCode.app/Contents/MacOS/OpenCode" $out/bin/OpenCode
+      '')
+      (lib.optionalString stdenvNoCC.hostPlatform.isLinux ''
+        mkdir -p $out/opt/opencode-desktop
+        appDir="packages/desktop/dist/${appDir}"
+        [ -d "$appDir" ] || { echo "no electron-builder output dir found: $appDir"; exit 1; }
+        cp -r "$appDir/resources" $out/opt/opencode-desktop/
 
-    makeWrapper ${lib.getExe electron} $out/bin/opencode-desktop \
-      --inherit-argv0 \
-      --add-flags $out/opt/opencode-desktop/resources/app.asar \
-      --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime=true --wayland-text-input-version=3}}" \
-      --add-flags ${lib.escapeShellArg commandLineArgs}
-  ''
-  + ''
-    runHook postInstall
-  '';
+        for size in 32 64 128; do
+          install -Dm644 \
+            packages/desktop/resources/icons/''${size}x''${size}.png \
+            $out/share/icons/hicolor/''${size}x''${size}/apps/opencode-desktop.png
+        done
+        for size in 30 44 71 89 107 142 150 284 310; do
+          install -Dm644 \
+            packages/desktop/resources/icons/Square''${size}x''${size}Logo.png \
+            $out/share/icons/hicolor/''${size}x''${size}/apps/opencode-desktop.png
+        done
+
+        makeWrapper ${lib.getExe electron} $out/bin/opencode-desktop \
+          --inherit-argv0 \
+          --set ELECTRON_FORCE_IS_PACKAGED 1 \
+          --add-flags $out/opt/opencode-desktop/resources/app.asar \
+          --add-flags "\''${NIXOS_OZONE_WL:+\''${WAYLAND_DISPLAY:+--ozone-platform-hint=auto --enable-features=WaylandWindowDecorations --enable-wayland-ime=true --wayland-text-input-version=3}}" \
+          --add-flags ${lib.escapeShellArg commandLineArgs}
+      '')
+      ''
+        runHook postInstall
+      ''
+    ];
 
   meta = {
     description = "AI coding agent desktop client";
     homepage = "https://opencode.ai";
     inherit (opencode.meta) platforms;
     license = lib.licenses.mit;
-    mainProgram = "OpenCode";
+    mainProgram = if stdenvNoCC.hostPlatform.isDarwin then "OpenCode" else "opencode-desktop";
     maintainers = with lib.maintainers; [ xiaoxiangmoe ];
   };
 })