Run flutter tester with arch -x86_64 on arm64 Mac (flutter#92508)

Author: jmagman

packages/flutter_tools/lib/src/test/flutter_tester_device.dart

@@ -16,6 +16,7 @@ import '../base/common.dart';
 import '../base/file_system.dart';
 import '../base/io.dart';
 import '../base/logger.dart';
+import '../base/os.dart';
 import '../base/platform.dart';
 import '../convert.dart';
 import '../device.dart';
@@ -46,7 +47,13 @@ class FlutterTesterTestDevice extends TestDevice {
   })  : assert(shellPath != null), // Please provide the path to the shell in the SKY_SHELL environment variable.
         assert(!debuggingOptions.startPaused || enableObservatory),
         _gotProcessObservatoryUri = enableObservatory
-            ? Completer<Uri>() : (Completer<Uri>()..complete(null));
+            ? Completer<Uri>() : (Completer<Uri>()..complete(null)),
+        _operatingSystemUtils = OperatingSystemUtils(
+          fileSystem: fileSystem,
+          logger: logger,
+          platform: platform,
+          processManager: processManager,
+        );
 
   /// Used for logging to identify the test that is currently being executed.
   final int id;
@@ -70,6 +77,7 @@ class FlutterTesterTestDevice extends TestDevice {
 
   Process _process;
   HttpServer _server;
+  final OperatingSystemUtils _operatingSystemUtils;
 
   /// Starts the device.
   ///
@@ -87,6 +95,13 @@ class FlutterTesterTestDevice extends TestDevice {
     logger.printTrace('test $id: test harness socket server is running at port:${_server.port}');
 
     final List<String> command = <String>[
+      // Until an arm64 flutter tester binary is available, force to run in Rosetta
+      // to avoid "unexpectedly got a signal in sigtramp" crash.
+      // https://github.com/flutter/flutter/issues/88106
+      if (_operatingSystemUtils.hostPlatform == HostPlatform.darwin_arm) ...<String>[
+        '/usr/bin/arch',
+        '-x86_64',
+      ],
       shellPath,
       if (enableObservatory) ...<String>[
         // Some systems drive the _FlutterPlatform class in an unusual way, where

packages/flutter_tools/test/general.shard/flutter_tester_device_test.dart

@@ -51,9 +51,66 @@ void main() {
       dartEntrypointArgs: dartEntrypointArgs,
     );
 
+  testUsingContext('runs in Rosetta on arm64 Mac', () async {
+    final FakeProcessManager processManager = FakeProcessManager.empty();
+    final FlutterTesterTestDevice device = TestFlutterTesterDevice(
+      platform: FakePlatform(operatingSystem: 'macos'),
+      fileSystem: fileSystem,
+      processManager: processManager,
+      enableObservatory: false,
+      dartEntrypointArgs: const <String>[],
+    );
+    processManager.addCommands(<FakeCommand>[
+      const FakeCommand(
+        command: <String>[
+          'which',
+          'sysctl',
+        ],
+      ),
+      const FakeCommand(
+        command: <String>[
+          'sysctl',
+          'hw.optional.arm64',
+        ],
+        stdout: 'hw.optional.arm64: 1',
+      ),
+      FakeCommand(command: const <String>[
+        '/usr/bin/arch',
+        '-x86_64',
+        '/',
+        '--disable-observatory',
+        '--ipv6',
+        '--enable-checked-mode',
+        '--verify-entry-points',
+        '--enable-software-rendering',
+        '--skia-deterministic-rendering',
+        '--enable-dart-profiling',
+        '--non-interactive',
+        '--use-test-fonts',
+        '--packages=.dart_tool/package_config.json',
+        'example.dill',
+      ], environment: <String, String>{
+        'FLUTTER_TEST': 'true',
+        'FONTCONFIG_FILE': device.fontConfigManager.fontConfigFile.path,
+        'SERVER_PORT': '0',
+        'APP_NAME': '',
+      }),
+    ]);
+    await device.start('example.dill');
+    expect(processManager.hasRemainingExpectations, isFalse);
+  });
+
   group('The FLUTTER_TEST environment variable is passed to the test process', () {
     setUp(() {
-      processManager = FakeProcessManager.empty();
+      processManager = FakeProcessManager.list(<FakeCommand>[
+        const FakeCommand(
+          command: <String>[
+            'uname',
+            '-m',
+          ],
+          stdout: 'x86_64',
+        ),
+      ]);
       device = createDevice();
 
       fileSystem
@@ -127,6 +184,13 @@ void main() {
   group('Dart Entrypoint Args', () {
     setUp(() {
       processManager = FakeProcessManager.list(<FakeCommand>[
+        const FakeCommand(
+          command: <String>[
+            'uname',
+            '-m',
+          ],
+          stdout: 'x86_64',
+        ),
         const FakeCommand(
           command: <String>[
             '/',
@@ -161,6 +225,13 @@ void main() {
   group('DDS', () {
     setUp(() {
       processManager = FakeProcessManager.list(<FakeCommand>[
+        const FakeCommand(
+          command: <String>[
+            'uname',
+            '-m',
+          ],
+          stdout: 'x86_64',
+        ),
         const FakeCommand(
           command: <String>[
             '/',