[flutter_tools] Port xcode backend to dart (#86753)

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

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:file/file.dart';
+import 'package:file/memory.dart';
+import 'package:flutter_tools/src/base/io.dart';
+
+import '../../bin/xcode_backend.dart';
+import '../src/common.dart';
+import '../src/fake_process_manager.dart';
+
+void main() {
+  late MemoryFileSystem fileSystem;
+
+  setUp(() {
+    fileSystem = MemoryFileSystem();
+  });
+
+  group('build', () {
+    test('exits with useful error message when build mode not set', () {
+      final Directory buildDir = fileSystem.directory('/path/to/builds')
+        ..createSync(recursive: true);
+      final Directory flutterRoot = fileSystem.directory('/path/to/flutter')
+        ..createSync(recursive: true);
+      final File pipe = fileSystem.file('/tmp/pipe')
+        ..createSync(recursive: true);
+      const String buildMode = 'Debug';
+      final TestContext context = TestContext(
+        <String>['build'],
+        <String, String>{
+          'BUILT_PRODUCTS_DIR': buildDir.path,
+          'ENABLE_BITCODE': 'YES',
+          'FLUTTER_ROOT': flutterRoot.path,
+          'INFOPLIST_PATH': 'Info.plist',
+        },
+        commands: <FakeCommand>[
+          FakeCommand(
+            command: <String>[
+              '${flutterRoot.path}/bin/flutter',
+              'assemble',
+              '--no-version-check',
+              '--output=${buildDir.path}/',
+              '-dTargetPlatform=ios',
+              '-dTargetFile=lib/main.dart',
+              '-dBuildMode=${buildMode.toLowerCase()}',
+              '-dIosArchs=',
+              '-dSdkRoot=',
+              '-dSplitDebugInfo=',
+              '-dTreeShakeIcons=',
+              '-dTrackWidgetCreation=',
+              '-dDartObfuscation=',
+              '-dEnableBitcode=',
+              '--ExtraGenSnapshotOptions=',
+              '--DartDefines=',
+              '--ExtraFrontEndOptions=',
+              'debug_ios_bundle_flutter_assets',
+            ],
+          ),
+        ],
+        fileSystem: fileSystem,
+        scriptOutputStreamFile: pipe,
+      );
+      expect(
+          () => context.run(),
+          throwsException,
+      );
+      expect(
+        context.stderr,
+        contains('ERROR: Unknown FLUTTER_BUILD_MODE: null.\n'),
+      );
+    });
+    test('calls flutter assemble', () {
+      final Directory buildDir = fileSystem.directory('/path/to/builds')
+        ..createSync(recursive: true);
+      final Directory flutterRoot = fileSystem.directory('/path/to/flutter')
+        ..createSync(recursive: true);
+      final File pipe = fileSystem.file('/tmp/pipe')
+        ..createSync(recursive: true);
+      const String buildMode = 'Debug';
+      final TestContext context = TestContext(
+        <String>['build'],
+        <String, String>{
+          'BUILT_PRODUCTS_DIR': buildDir.path,
+          'CONFIGURATION': buildMode,
+          'ENABLE_BITCODE': 'YES',
+          'FLUTTER_ROOT': flutterRoot.path,
+          'INFOPLIST_PATH': 'Info.plist',
+        },
+        commands: <FakeCommand>[
+          FakeCommand(
+            command: <String>[
+              '${flutterRoot.path}/bin/flutter',
+              'assemble',
+              '--no-version-check',
+              '--output=${buildDir.path}/',
+              '-dTargetPlatform=ios',
+              '-dTargetFile=lib/main.dart',
+              '-dBuildMode=${buildMode.toLowerCase()}',
+              '-dIosArchs=',
+              '-dSdkRoot=',
+              '-dSplitDebugInfo=',
+              '-dTreeShakeIcons=',
+              '-dTrackWidgetCreation=',
+              '-dDartObfuscation=',
+              '-dEnableBitcode=',
+              '--ExtraGenSnapshotOptions=',
+              '--DartDefines=',
+              '--ExtraFrontEndOptions=',
+              'debug_ios_bundle_flutter_assets',
+            ],
+          ),
+        ],
+        fileSystem: fileSystem,
+        scriptOutputStreamFile: pipe,
+      )..run();
+      final List<String> streamedLines = pipe.readAsLinesSync();
+      // Ensure after line splitting, the exact string 'done' appears
+      expect(streamedLines, contains('done'));
+      expect(streamedLines, contains(' └─Compiling, linking and signing...'));
+      expect(
+        context.stdout,
+        contains('built and packaged successfully.'),
+      );
+      expect(context.stderr, isEmpty);
+    });
+
+    test('forwards all env variables to flutter assemble', () {
+      final Directory buildDir = fileSystem.directory('/path/to/builds')
+        ..createSync(recursive: true);
+      final Directory flutterRoot = fileSystem.directory('/path/to/flutter')
+        ..createSync(recursive: true);
+      const String archs = 'arm64 armv7';
+      const String buildMode = 'Release';
+      const String dartObfuscation = 'false';
+      const String dartDefines = 'flutter.inspector.structuredErrors%3Dtrue';
+      const String expandedCodeSignIdentity = 'F1326572E0B71C3C8442805230CB4B33B708A2E2';
+      const String extraFrontEndOptions = '--some-option';
+      const String extraGenSnapshotOptions = '--obfuscate';
+      const String sdkRoot = '/path/to/sdk';
+      const String splitDebugInfo = '/path/to/split/debug/info';
+      const String trackWidgetCreation = 'true';
+      const String treeShake = 'true';
+      final TestContext context = TestContext(
+        <String>['build'],
+        <String, String>{
+          'ACTION': 'install',
+          'ARCHS': archs,
+          'BUILT_PRODUCTS_DIR': buildDir.path,
+          'CODE_SIGNING_REQUIRED': 'YES',
+          'CONFIGURATION': buildMode,
+          'DART_DEFINES': dartDefines,
+          'DART_OBFUSCATION': dartObfuscation,
+          'ENABLE_BITCODE': 'YES',
+          'EXPANDED_CODE_SIGN_IDENTITY': expandedCodeSignIdentity,
+          'EXTRA_FRONT_END_OPTIONS': extraFrontEndOptions,
+          'EXTRA_GEN_SNAPSHOT_OPTIONS': extraGenSnapshotOptions,
+          'FLUTTER_ROOT': flutterRoot.path,
+          'INFOPLIST_PATH': 'Info.plist',
+          'SDKROOT': sdkRoot,
+          'SPLIT_DEBUG_INFO': splitDebugInfo,
+          'TRACK_WIDGET_CREATION': trackWidgetCreation,
+          'TREE_SHAKE_ICONS': treeShake,
+        },
+        commands: <FakeCommand>[
+          FakeCommand(
+            command: <String>[
+              '${flutterRoot.path}/bin/flutter',
+              'assemble',
+              '--no-version-check',
+              '--output=${buildDir.path}/',
+              '-dTargetPlatform=ios',
+              '-dTargetFile=lib/main.dart',
+              '-dBuildMode=${buildMode.toLowerCase()}',
+              '-dIosArchs=$archs',
+              '-dSdkRoot=$sdkRoot',
+              '-dSplitDebugInfo=$splitDebugInfo',
+              '-dTreeShakeIcons=$treeShake',
+              '-dTrackWidgetCreation=$trackWidgetCreation',
+              '-dDartObfuscation=$dartObfuscation',
+              '-dEnableBitcode=true',
+              '--ExtraGenSnapshotOptions=$extraGenSnapshotOptions',
+              '--DartDefines=$dartDefines',
+              '--ExtraFrontEndOptions=$extraFrontEndOptions',
+              '-dCodesignIdentity=$expandedCodeSignIdentity',
+              'release_ios_bundle_flutter_assets',
+            ],
+          ),
+        ],
+        fileSystem: fileSystem,
+      )..run();
+      expect(
+        context.stdout,
+        contains('built and packaged successfully.'),
+      );
+      expect(context.stderr, isEmpty);
+    });
+  });
+
+  group('test_observatory_bonjour_service', () {
+    test('handles when the Info.plist is missing', () {
+      final Directory buildDir = fileSystem.directory('/path/to/builds');
+      buildDir.createSync(recursive: true);
+      final TestContext context = TestContext(
+        <String>['test_observatory_bonjour_service'],
+        <String, String>{
+          'CONFIGURATION': 'Debug',
+          'BUILT_PRODUCTS_DIR': buildDir.path,
+          'INFOPLIST_PATH': 'Info.plist',
+        },
+        commands: <FakeCommand>[],
+        fileSystem: fileSystem,
+      )..run();
+      expect(
+        context.stdout,
+        contains(
+            'Info.plist does not exist. Skipping _dartobservatory._tcp NSBonjourServices insertion.'),
+      );
+    });
+  });
+}
+
+class TestContext extends Context {
+  TestContext(
+    List<String> arguments,
+    Map<String, String> environment, {
+    required this.fileSystem,
+    required List<FakeCommand> commands,
+    File? scriptOutputStreamFile,
+  })  : processManager = FakeProcessManager.list(commands),
+        super(arguments: arguments, environment: environment, scriptOutputStreamFile: scriptOutputStreamFile);
+
+  final FileSystem fileSystem;
+  final FakeProcessManager processManager;
+
+  String stdout = '';
+  String stderr = '';
+
+  @override
+  bool existsDir(String path) {
+    return fileSystem.directory(path).existsSync();
+  }
+
+  @override
+  bool existsFile(String path) {
+    return fileSystem.file(path).existsSync();
+  }
+
+  @override
+  ProcessResult runSync(
+    String bin,
+    List<String> args, {
+    bool verbose = false,
+    bool allowFail = false,
+    String? workingDirectory,
+  }) {
+    return processManager.runSync(
+      <dynamic>[bin, ...args],
+      workingDirectory: workingDirectory,
+      environment: environment,
+    );
+  }
+
+  @override
+  void echoError(String message) {
+    stderr += '$message\n';
+  }
+
+  @override
+  void echo(String message) {
+    stdout += message;
+  }
+
+  @override
+  Never exitApp(int code) {
+    // This is an exception for the benefit of unit tests.
+    // The real implementation calls `exit(code)`.
+    throw Exception('App exited with code $code');
+  }
+}

packages/flutter_tools/test/integration.shard/forbidden_imports_test.dart

@@ -63,6 +63,8 @@ void main() {
 
   test('no unauthorized imports of dart:io', () {
     final List<String> allowedPaths = <String>[
+      // This is a standalone script invoked by xcode, not part of the tool
+      fileSystem.path.join(flutterTools, 'bin', 'xcode_backend.dart'),
       fileSystem.path.join(flutterTools, 'lib', 'src', 'base', 'io.dart'),
       fileSystem.path.join(flutterTools, 'lib', 'src', 'base', 'platform.dart'),
       fileSystem.path.join(flutterTools, 'lib', 'src', 'base', 'error_handling_io.dart'),