antigravity-fhs: support auto-discovery of google-chrome/chromium (#463233)

pkgs/by-name/an/antigravity/package.nix

@@ -4,6 +4,9 @@
   callPackage,
   vscode-generic,
   fetchurl,
+  buildFHSEnv,
+  writeShellScript,
+  coreutils,
   commandLineArgs ? "",
   useVSCodeRipgrep ? stdenv.hostPlatform.isDarwin,
 }:
@@ -40,6 +43,29 @@ callPackage vscode-generic {
 
   sourceRoot = if hostPlatform.isDarwin then "Antigravity.app" else "Antigravity";
 
+  # When running inside an FHS environment, try linking Google Chrome or Chromium
+  # to the hardcoded Playwright search path: /opt/google/chrome/chrome
+  buildFHSEnv =
+    args:
+    buildFHSEnv (
+      args
+      // {
+        extraBuildCommands = (args.extraBuildCommands or "") + ''
+          mkdir -p "$out/opt/google/chrome"
+        '';
+        extraBwrapArgs = (args.extraBwrapArgs or [ ]) ++ [ "--tmpfs /opt/google/chrome" ];
+        runScript = writeShellScript "antigravity-wrapper" ''
+          for candidate in google-chrome-stable google-chrome chromium-browser chromium; do
+            if target=$(command -v "$candidate"); then
+              ${coreutils}/bin/ln -sf "$target" /opt/google/chrome/chrome
+              break
+            fi
+          done
+          exec ${args.runScript} "$@"
+        '';
+      }
+    );
+
   tests = { };
   updateScript = ./update.sh;