[flutter_tools] [dap] Add support for passing env variables to spawned processes (#107415)

* [flutter_tools] [dap] Add support for passing env variables to spawned processes

* Use named args

* Use in-memory fs and FakePlatform

* Pass filesystem style to MemoryFileSystem

packages/flutter_tools/lib/src/debug_adapters/flutter_adapter.dart

@@ -305,7 +305,11 @@ class FlutterDebugAdapter extends DartDebugAdapter<FlutterLaunchRequestArguments
       ...?userArgs,
     ];
 
-    await launchAsProcess(executable, processArgs);
+    await launchAsProcess(
+      executable: executable,
+      processArgs: processArgs,
+      env: args.env,
+    );
 
     // Delay responding until the app is launched and (optionally) the debugger
     // is connected.
@@ -316,12 +320,17 @@ class FlutterDebugAdapter extends DartDebugAdapter<FlutterLaunchRequestArguments
   }
 
   @visibleForOverriding
-  Future<void> launchAsProcess(String executable, List<String> processArgs) async {
+  Future<void> launchAsProcess({
+    required String executable,
+    required List<String> processArgs,
+    required Map<String, String>? env,
+  }) async {
     logger?.call('Spawning $executable with $processArgs in ${args.cwd}');
     final Process process = await Process.start(
       executable,
       processArgs,
       workingDirectory: args.cwd,
+      environment: env,
     );
     _process = process;
     pidsToTerminate.add(process.pid);

packages/flutter_tools/lib/src/debug_adapters/flutter_adapter_args.dart

@@ -20,6 +20,7 @@ class FlutterAttachRequestArguments
     super.restart,
     super.name,
     super.cwd,
+    super.env,
     super.additionalProjectPaths,
     super.debugSdkLibraries,
     super.debugExternalPackageLibraries,
@@ -91,6 +92,7 @@ class FlutterLaunchRequestArguments
     super.restart,
     super.name,
     super.cwd,
+    super.env,
     super.additionalProjectPaths,
     super.debugSdkLibraries,
     super.debugExternalPackageLibraries,

packages/flutter_tools/lib/src/debug_adapters/flutter_test_adapter.dart

@@ -135,7 +135,11 @@ class FlutterTestDebugAdapter extends DartDebugAdapter<FlutterLaunchRequestArgum
       ...?args.args,
     ];
 
-    await launchAsProcess(executable, processArgs);
+    await launchAsProcess(
+      executable: executable,
+      processArgs: processArgs,
+      env: args.env,
+    );
 
     // Delay responding until the debugger is connected.
     if (debug) {
@@ -144,12 +148,17 @@ class FlutterTestDebugAdapter extends DartDebugAdapter<FlutterLaunchRequestArgum
   }
 
   @visibleForOverriding
-  Future<void> launchAsProcess(String executable, List<String> processArgs) async {
+  Future<void> launchAsProcess({
+    required String executable,
+    required List<String> processArgs,
+    required Map<String, String>? env,
+  }) async {
     logger?.call('Spawning $executable with $processArgs in ${args.cwd}');
     final Process process = await Process.start(
       executable,
       processArgs,
       workingDirectory: args.cwd,
+      environment: env,
     );
     _process = process;
     pidsToTerminate.add(process.pid);

packages/flutter_tools/test/general.shard/dap/flutter_adapter_test.dart

@@ -4,9 +4,11 @@
 
 import 'dart:async';
 
+import 'package:file/memory.dart';
+import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/debug_adapters/flutter_adapter_args.dart';
-import 'package:flutter_tools/src/globals.dart' as globals;
+import 'package:flutter_tools/src/globals.dart' as globals show platform;
 import 'package:test/fake.dart';
 import 'package:test/test.dart';
 import 'package:vm_service/vm_service.dart';
@@ -14,21 +16,27 @@ import 'package:vm_service/vm_service.dart';
 import 'mocks.dart';
 
 void main() {
+  // Use the real platform as a base so that Windows bots test paths.
+  final FakePlatform platform = FakePlatform.fromPlatform(globals.platform);
+  final FileSystemStyle fsStyle = platform.isWindows ? FileSystemStyle.windows : FileSystemStyle.posix;
+
   group('flutter adapter', () {
-    final String expectedFlutterExecutable = globals.platform.isWindows
+    final String expectedFlutterExecutable = platform.isWindows
         ? r'C:\fake\flutter\bin\flutter.bat'
         : '/fake/flutter/bin/flutter';
 
     setUpAll(() {
-      Cache.flutterRoot = globals.platform.isWindows
+      Cache.flutterRoot = platform.isWindows
           ? r'C:\fake\flutter'
           : '/fake/flutter';
     });
 
-
     group('launchRequest', () {
       test('runs "flutter run" with --machine', () async {
-      final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -43,8 +51,33 @@ void main() {
         expect(adapter.processArgs, containsAllInOrder(<String>['run', '--machine']));
       });
 
+      test('includes env variables', () async {
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
+        final Completer<void> responseCompleter = Completer<void>();
+
+        final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
+          cwd: '/project',
+          program: 'foo.dart',
+          env: <String, String>{
+            'MY_TEST_ENV': 'MY_TEST_VALUE',
+          },
+        );
+
+        await adapter.configurationDoneRequest(MockRequest(), null, () {});
+        await adapter.launchRequest(MockRequest(), args, responseCompleter.complete);
+        await responseCompleter.future;
+
+        expect(adapter.env!['MY_TEST_ENV'], 'MY_TEST_VALUE');
+      });
+
       test('does not record the VMs PID for terminating', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -65,10 +98,12 @@ void main() {
       });
     });
 
-
     group('attachRequest', () {
       test('runs "flutter attach" with --machine', () async {
-      final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterAttachRequestArguments args = FlutterAttachRequestArguments(
@@ -83,7 +118,10 @@ void main() {
       });
 
       test('does not record the VMs PID for terminating', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterAttachRequestArguments args = FlutterAttachRequestArguments(
@@ -105,7 +143,10 @@ void main() {
 
     group('--start-paused', () {
       test('is passed for debug mode', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -121,7 +162,10 @@ void main() {
       });
 
       test('is not passed for noDebug mode', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -138,7 +182,10 @@ void main() {
       });
 
       test('is not passed if toolArgs contains --profile', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -155,7 +202,10 @@ void main() {
       });
 
       test('is not passed if toolArgs contains --release', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
 
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -173,7 +223,10 @@ void main() {
     });
 
     test('includes toolArgs', () async {
-      final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+      final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+        fileSystem: MemoryFileSystem.test(style: fsStyle),
+        platform: platform,
+      );
       final Completer<void> responseCompleter = Completer<void>();
 
       final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -193,7 +246,10 @@ void main() {
 
     group('includes customTool', () {
       test('with no args replaced', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
           cwd: '/project',
           program: 'foo.dart',
@@ -212,7 +268,10 @@ void main() {
       });
 
       test('with all args replaced', () async {
-        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(fileSystem: globals.fs, platform: globals.platform);
+        final MockFlutterDebugAdapter adapter = MockFlutterDebugAdapter(
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
           cwd: '/project',
           program: 'foo.dart',

packages/flutter_tools/test/general.shard/dap/flutter_test_adapter_test.dart

@@ -4,29 +4,35 @@
 
 import 'dart:async';
 
+import 'package:file/memory.dart';
+import 'package:flutter_tools/src/base/platform.dart';
 import 'package:flutter_tools/src/cache.dart';
 import 'package:flutter_tools/src/debug_adapters/flutter_adapter_args.dart';
-import 'package:flutter_tools/src/globals.dart' as globals;
+import 'package:flutter_tools/src/globals.dart' as globals show platform;
 import 'package:test/test.dart';
 
 import 'mocks.dart';
 
 void main() {
+  // Use the real platform as a base so that Windows bots test paths.
+  final FakePlatform platform = FakePlatform.fromPlatform(globals.platform);
+  final FileSystemStyle fsStyle = platform.isWindows ? FileSystemStyle.windows : FileSystemStyle.posix;
+
   group('flutter test adapter', () {
-    final String expectedFlutterExecutable = globals.platform.isWindows
+    final String expectedFlutterExecutable = platform.isWindows
         ? r'C:\fake\flutter\bin\flutter.bat'
         : '/fake/flutter/bin/flutter';
 
     setUpAll(() {
-      Cache.flutterRoot = globals.platform.isWindows
+      Cache.flutterRoot = platform.isWindows
           ? r'C:\fake\flutter'
           : '/fake/flutter';
     });
 
     test('includes toolArgs', () async {
       final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(
-        fileSystem: globals.fs,
+        fileSystem: MemoryFileSystem.test(style: fsStyle),
-        platform: globals.platform,
+        platform: platform,
       );
       final Completer<void> responseCompleter = Completer<void>();
       final MockRequest request = MockRequest();
@@ -45,10 +51,34 @@ void main() {
       expect(adapter.processArgs, contains('tool_arg'));
     });
 
+    test('includes env variables', () async {
+      final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(
+        fileSystem: MemoryFileSystem.test(style: fsStyle),
+        platform: platform,
+      );
+      final Completer<void> responseCompleter = Completer<void>();
+      final MockRequest request = MockRequest();
+      final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
+        cwd: '/project',
+        program: 'foo.dart',
+        env: <String, String>{
+          'MY_TEST_ENV': 'MY_TEST_VALUE',
+        },
+      );
+
+      await adapter.configurationDoneRequest(request, null, () {});
+      await adapter.launchRequest(request, args, responseCompleter.complete);
+      await responseCompleter.future;
+
+      expect(adapter.env!['MY_TEST_ENV'], 'MY_TEST_VALUE');
+    });
+
     group('includes customTool', () {
       test('with no args replaced', () async {
-        final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(fileSystem: globals.fs,
+        final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(
-        platform: globals.platform,);
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
         final MockRequest request = MockRequest();
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(
@@ -68,8 +98,10 @@ void main() {
       });
 
       test('with all args replaced', () async {
-        final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(fileSystem: globals.fs,
+        final MockFlutterTestDebugAdapter adapter = MockFlutterTestDebugAdapter(
-        platform: globals.platform,);
+          fileSystem: MemoryFileSystem.test(style: fsStyle),
+          platform: platform,
+        );
         final Completer<void> responseCompleter = Completer<void>();
         final MockRequest request = MockRequest();
         final FlutterLaunchRequestArguments args = FlutterLaunchRequestArguments(

packages/flutter_tools/test/general.shard/dap/mocks.dart

@@ -42,11 +42,17 @@ class MockFlutterDebugAdapter extends FlutterDebugAdapter {
 
   late String executable;
   late List<String> processArgs;
+  late Map<String, String>? env;
 
   @override
-  Future<void> launchAsProcess(String executable, List<String> processArgs) async {
+  Future<void> launchAsProcess({
+    required String executable,
+    required List<String> processArgs,
+    required Map<String, String>? env,
+  }) async {
     this.executable = executable;
     this.processArgs = processArgs;
+    this.env = env;
 
     // Pretend we launched the app and got the app.started event so that
     // launchRequest will complete.
@@ -94,11 +100,25 @@ class MockFlutterTestDebugAdapter extends FlutterTestDebugAdapter {
 
   late String executable;
   late List<String> processArgs;
+  late Map<String, String>? env;
 
   @override
-  Future<void> launchAsProcess(String executable, List<String> processArgs,) async {
+  Future<void> launchAsProcess({
+    required String executable,
+    required List<String> processArgs,
+    required Map<String, String>? env,
+  }) async {
     this.executable = executable;
     this.processArgs = processArgs;
+    this.env = env;
+  }
+
+  @override
+  Future<void> get debuggerInitialized {
+    // If we were mocking debug mode, then simulate the debugger initializing.
+    return enableDebugger
+        ? Future<void>.value()
+        : throw StateError('Invalid attempt to wait for debuggerInitialized when not debugging');
   }
 }