cargo-tauri: only install .app bundles on Darwin (#499908)

pkgs/by-name/ca/cargo-tauri/hook.nix

@@ -48,8 +48,18 @@ makeSetupHook {
     installScript =
       {
         darwin = ''
-          mkdir -p $out
-          mv "$targetDir"/bundle/macos $out/Applications
+          mkdir -p "$out/Applications"
+
+          shopt -s nullglob
+          appBundles=("$targetDir"/bundle/macos/*.app)
+          shopt -u nullglob
+
+          if [ "''${#appBundles[@]}" -eq 0 ]; then
+            echo "cargo-tauri.hook: no .app bundles found in $targetDir/bundle/macos" >&2
+            exit 1
+          fi
+
+          mv -- "''${appBundles[@]}" "$out/Applications/"
         '';
 
         linux = ''

pkgs/by-name/ca/cargo-tauri/test-app.nix

@@ -64,10 +64,40 @@ stdenv.mkDerivation (finalAttrs: {
   preBuild = ''
     pnpm --filter '@tauri-apps/api' build
   '';
+  postBuild = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    bundleDir="target/${stdenv.hostPlatform.rust.cargoShortTarget}/''${cargoBuildType:-release}/bundle/macos"
+    touch "$bundleDir/.test-hidden-entry"
+    touch "$bundleDir/test-visible-entry"
+  '';
 
   # No one should be actually running this, so lets save some time
   buildType = "debug";
   doCheck = false;
+  doInstallCheck = stdenv.hostPlatform.isDarwin;
+  installCheckPhase = lib.optionalString stdenv.hostPlatform.isDarwin ''
+    runHook preInstallCheck
+
+    test -d "$out/Applications"
+
+    shopt -s nullglob dotglob
+    appBundles=("$out"/Applications/*.app)
+    nonAppEntries=("$out"/Applications/*)
+    shopt -u nullglob dotglob
+
+    test "''${#appBundles[@]}" -gt 0
+
+    for entry in "''${nonAppEntries[@]}"; do
+      case "$entry" in
+        *.app) ;;
+        *)
+          echo "unexpected non-.app entry in Applications: $entry" >&2
+          exit 1
+          ;;
+      esac
+    done
+
+    runHook postInstallCheck
+  '';
 
   meta = {
     inherit (cargo-tauri.hook.meta) platforms;