// 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:package_config/package_config.dart'; import '../artifacts.dart'; import '../base/common.dart'; import '../base/file_system.dart'; import '../base/logger.dart'; import '../base/platform.dart'; import '../base/user_messages.dart' hide userMessages; import '../cache.dart'; import '../dart/package_map.dart'; /// A strategy for locating the out/ directory of a local engine build. /// /// The flutter tool can be run with the output files of one or more engine builds /// replacing the cached artifacts. Typically this is done by setting the /// `--local-engine` command line flag to the name of the desired engine variant /// (e.g. "host_debug_unopt"). Provided that the `flutter/` and `engine/` directories /// are located adjacent to one another, the output folder will be located /// automatically. /// /// For scenarios where the engine is not adjacent to flutter, the /// `--local-engine-src-path` can be provided to give an exact path. /// /// For more information on local engines, see CONTRIBUTING.md. class LocalEngineLocator { LocalEngineLocator({ required Platform platform, required Logger logger, required FileSystem fileSystem, required String flutterRoot, required UserMessages userMessages, }) : _platform = platform, _logger = logger, _fileSystem = fileSystem, _flutterRoot = flutterRoot, _userMessages = userMessages; final Platform _platform; final Logger _logger; final FileSystem _fileSystem; final String _flutterRoot; final UserMessages _userMessages; /// Returns the engine build path of a local engine if one is located, otherwise `null`. Future<EngineBuildPaths?> findEnginePath(String? engineSourcePath, String? localEngine, String? packagePath) async { engineSourcePath ??= _platform.environment[kFlutterEngineEnvironmentVariableName]; if (engineSourcePath == null && localEngine != null) { try { engineSourcePath = _findEngineSourceByLocalEngine(localEngine); engineSourcePath ??= await _findEngineSourceByPackageConfig(packagePath); } on FileSystemException catch (e) { _logger.printTrace('Local engine auto-detection file exception: $e'); engineSourcePath = null; } // If engineSourcePath is still not set, try to determine it by flutter root. engineSourcePath ??= _tryEnginePath( _fileSystem.path.join(_fileSystem.directory(_flutterRoot).parent.path, 'engine', 'src'), ); } if (engineSourcePath != null && _tryEnginePath(engineSourcePath) == null) { throwToolExit( _userMessages.runnerNoEngineBuildDirInPath(engineSourcePath), exitCode: 2, ); } if (engineSourcePath != null) { _logger.printTrace('Local engine source at $engineSourcePath'); return _findEngineBuildPath(localEngine, engineSourcePath); } if (localEngine != null) { throwToolExit( _userMessages.runnerNoEngineSrcDir( kFlutterEnginePackageName, kFlutterEngineEnvironmentVariableName, ), exitCode: 2, ); } return null; } String? _findEngineSourceByLocalEngine(String localEngine) { // When the local engine is an absolute path to a variant inside the // out directory, parse the engine source. // --local-engine /path/to/cache/builder/src/out/host_debug_unopt if (_fileSystem.path.isAbsolute(localEngine)) { final Directory localEngineDirectory = _fileSystem.directory(localEngine); final Directory outDirectory = localEngineDirectory.parent; final Directory srcDirectory = outDirectory.parent; if (localEngineDirectory.existsSync() && outDirectory.basename == 'out' && srcDirectory.basename == 'src') { _logger.printTrace('Parsed engine source from local engine as ${srcDirectory.path}.'); return srcDirectory.path; } } return null; } Future<String?> _findEngineSourceByPackageConfig(String? packagePath) async { final PackageConfig packageConfig = await loadPackageConfigWithLogging( _fileSystem.file( // TODO(zanderso): update to package_config packagePath ?? _fileSystem.path.join('.packages'), ), logger: _logger, throwOnError: false, ); // Skip if sky_engine is the version in bin/cache. Uri? engineUri = packageConfig[kFlutterEnginePackageName]?.packageUriRoot; final String cachedPath = _fileSystem.path.join(_flutterRoot, 'bin', 'cache', 'pkg', kFlutterEnginePackageName, 'lib'); if (engineUri != null && _fileSystem.identicalSync(cachedPath, engineUri.path)) { _logger.printTrace('Local engine auto-detection sky_engine in $packagePath is the same version in bin/cache.'); engineUri = null; } // If sky_engine is specified and the engineSourcePath not set, try to // determine the engineSourcePath by sky_engine setting. A typical engine Uri // looks like: // file://flutter-engine-local-path/src/out/host_debug_unopt/gen/dart-pkg/sky_engine/lib/ String? engineSourcePath; final String? engineUriPath = engineUri?.path; if (engineUriPath != null) { engineSourcePath = _fileSystem.directory(engineUriPath) .parent .parent .parent .parent .parent .parent .path; if (engineSourcePath != null && (engineSourcePath == _fileSystem.path.dirname(engineSourcePath) || engineSourcePath.isEmpty)) { engineSourcePath = null; throwToolExit( _userMessages.runnerNoEngineSrcDir( kFlutterEnginePackageName, kFlutterEngineEnvironmentVariableName, ), exitCode: 2, ); } } return engineSourcePath; } // Determine the host engine directory associated with the local engine: // Strip '_sim_' since there are no host simulator builds. String _getHostEngineBasename(String localEngineBasename) { String tmpBasename = localEngineBasename.replaceFirst('_sim_', '_'); tmpBasename = tmpBasename.substring(tmpBasename.indexOf('_') + 1); // Strip suffix for various archs. const List<String> suffixes = <String>['_arm', '_arm64', '_x86', '_x64']; for (final String suffix in suffixes) { tmpBasename = tmpBasename.replaceFirst(RegExp('$suffix\$'), ''); } return 'host_$tmpBasename'; } EngineBuildPaths _findEngineBuildPath(String? localEngine, String enginePath) { if (localEngine == null) { throwToolExit(_userMessages.runnerLocalEngineRequired, exitCode: 2); } final String engineBuildPath = _fileSystem.path.normalize(_fileSystem.path.join(enginePath, 'out', localEngine)); if (!_fileSystem.isDirectorySync(engineBuildPath)) { throwToolExit(_userMessages.runnerNoEngineBuild(engineBuildPath), exitCode: 2); } final String basename = _fileSystem.path.basename(engineBuildPath); final String hostBasename = _getHostEngineBasename(basename); final String engineHostBuildPath = _fileSystem.path.normalize( _fileSystem.path.join(_fileSystem.path.dirname(engineBuildPath), hostBasename), ); if (!_fileSystem.isDirectorySync(engineHostBuildPath)) { throwToolExit(_userMessages.runnerNoEngineBuild(engineHostBuildPath), exitCode: 2); } return EngineBuildPaths(targetEngine: engineBuildPath, hostEngine: engineHostBuildPath); } String? _tryEnginePath(String enginePath) { if (_fileSystem.isDirectorySync(_fileSystem.path.join(enginePath, 'out'))) { return enginePath; } return null; } }