[flutter_tools] remove PackageMap and finish PackageConfig migration (#55244)

packages/flutter_tools/bin/fuchsia_tester.dart

@@ -111,7 +111,7 @@ Future<void> run(List<String> args) async {
     // TODO(tvolkert): Remove once flutter_tester no longer looks for this.
     globals.fs.link(sdkRootDest.childFile('platform.dill').path).createSync('platform_strong.dill');
 
-    PackageMap.globalPackagesPath =
+    globalPackagesPath =
         globals.fs.path.normalize(globals.fs.path.absolute(argResults[_kOptionPackages] as String));
 
     Directory testDirectory;

packages/flutter_tools/lib/src/asset.dart

@@ -125,7 +125,7 @@ class _ManifestAssetBundle implements AssetBundle {
     bool reportLicensedPackages = false,
   }) async {
     assetDirPath ??= getAssetBuildDirectory();
-    packagesPath ??= globals.fs.path.absolute(PackageMap.globalPackagesPath);
+    packagesPath ??= globals.fs.path.absolute(globalPackagesPath);
     FlutterManifest flutterManifest;
     try {
       flutterManifest = FlutterManifest.createFromPath(
@@ -152,15 +152,9 @@ class _ManifestAssetBundle implements AssetBundle {
     }
 
     final String assetBasePath = globals.fs.path.dirname(globals.fs.path.absolute(manifestPath));
-    final PackageConfig packageConfig = await loadPackageConfigUri(
-      globals.fs.file(packagesPath).absolute.uri,
-      loader: (Uri uri) {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      },
+    final PackageConfig packageConfig = await loadPackageConfigOrFail(
+      globals.fs.file(packagesPath),
+      logger: globals.logger,
     );
     final List<Uri> wildcardDirectories = <Uri>[];
 

packages/flutter_tools/lib/src/build_runner/devfs_web.dart

@@ -144,15 +144,9 @@ class WebAssetServer implements AssetReader {
         address = (await InternetAddress.lookup(hostname)).first;
       }
       final HttpServer httpServer = await HttpServer.bind(address, port);
-      final PackageConfig packageConfig = await loadPackageConfigUri(
-        globals.fs.file(PackageMap.globalPackagesPath).absolute.uri,
-        loader: (Uri uri) {
-          final File file = globals.fs.file(uri);
-          if (!file.existsSync()) {
-            return null;
-          }
-          return file.readAsBytes();
-        }
+      final PackageConfig packageConfig = await loadPackageConfigOrFail(
+        globals.fs.file(globalPackagesPath),
+        logger: globals.logger,
       );
       final Map<String, String> digests = <String, String>{};
       final Map<String, String> modules = <String, String>{};

packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart

@@ -551,7 +551,7 @@ class _ResidentWebRunner extends ResidentWebRunner {
         ..createSync();
       result = _generatedEntrypointDirectory.childFile('web_entrypoint.dart');
 
-      final bool hasWebPlugins = findPlugins(flutterProject)
+      final bool hasWebPlugins = (await findPlugins(flutterProject))
         .any((Plugin p) => p.platforms.containsKey(WebPlugin.kConfigKey));
       await injectPlugins(flutterProject, checkProjects: true);
 

packages/flutter_tools/lib/src/build_runner/web_compilation_delegate.dart

@@ -41,7 +41,7 @@ class BuildRunnerWebCompilationProxy extends WebCompilationProxy {
       .childDirectory('.dart_tool')
       .createSync();
     final FlutterProject flutterProject = FlutterProject.fromDirectory(projectDirectory);
-    final bool hasWebPlugins = findPlugins(flutterProject)
+    final bool hasWebPlugins = (await findPlugins(flutterProject))
       .any((Plugin p) => p.platforms.containsKey(WebPlugin.kConfigKey));
     final BuildDaemonClient client = await const BuildDaemonCreator().startBuildDaemon(
       projectDirectory.path,

packages/flutter_tools/lib/src/build_system/targets/dart.dart

@@ -9,6 +9,7 @@ import '../../base/build.dart';
 import '../../base/file_system.dart';
 import '../../build_info.dart';
 import '../../compile.dart';
+import '../../dart/package_map.dart';
 import '../../globals.dart' as globals;
 import '../../project.dart';
 import '../build_system.dart';
@@ -231,15 +232,9 @@ class KernelSnapshot extends Target {
         forceLinkPlatform = false;
     }
 
-    final PackageConfig packageConfig = await loadPackageConfigUri(
-     packagesFile.absolute.uri,
-      loader: (Uri uri) {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    final PackageConfig packageConfig = await loadPackageConfigOrFail(
+      environment.projectDir.childFile('.packages'),
+      logger: environment.logger,
     );
 
     final CompilerOutput output = await compiler.compile(

packages/flutter_tools/lib/src/build_system/targets/web.dart

@@ -57,15 +57,9 @@ class WebEntrypointTarget extends Target {
     final bool shouldInitializePlatform = environment.defines[kInitializePlatform] == 'true';
     final bool hasPlugins = environment.defines[kHasWebPlugins] == 'true';
     final Uri importUri = environment.fileSystem.file(targetFile).absolute.uri;
-    final PackageConfig packageConfig = await loadPackageConfigUri(
-      environment.projectDir.childFile('.packages').absolute.uri,
-      loader: (Uri uri) {
-        final File file = environment.fileSystem.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    final PackageConfig packageConfig = await loadPackageConfigOrFail(
+      environment.projectDir.childFile('.packages'),
+      logger: environment.logger,
     );
 
     // Use the PackageConfig to find the correct package-scheme import path
@@ -159,7 +153,7 @@ class Dart2JSTarget extends Target {
     final bool csp = environment.defines[kCspMode] == 'true';
     final BuildMode buildMode = getBuildModeForName(environment.defines[kBuildMode]);
     final String specPath = globals.fs.path.join(globals.artifacts.getArtifactPath(Artifact.flutterWebSdk), 'libraries.json');
-    final String packageFile = PackageMap.globalPackagesPath;
+    final String packageFile = globalPackagesPath;
     final File outputKernel = environment.buildDir.childFile('app.dill');
     final File outputFile = environment.buildDir.childFile('main.dart.js');
     final List<String> dartDefines = parseDartDefines(environment);

packages/flutter_tools/lib/src/bundle.dart

@@ -74,7 +74,7 @@ class BundleBuilder {
     mainPath ??= defaultMainPath;
     depfilePath ??= defaultDepfilePath;
     assetDirPath ??= getAssetBuildDirectory();
-    packagesPath ??= globals.fs.path.absolute(PackageMap.globalPackagesPath);
+    packagesPath ??= globals.fs.path.absolute(globalPackagesPath);
     final FlutterProject flutterProject = FlutterProject.current();
     await buildWithAssemble(
       buildMode: buildInfo.mode,
@@ -177,7 +177,7 @@ Future<AssetBundle> buildAssets({
   bool reportLicensedPackages = false,
 }) async {
   assetDirPath ??= getAssetBuildDirectory();
-  packagesPath ??= globals.fs.path.absolute(PackageMap.globalPackagesPath);
+  packagesPath ??= globals.fs.path.absolute(globalPackagesPath);
 
   // Build the asset bundle.
   final AssetBundle assetBundle = AssetBundleFactory.instance.createBundle();

packages/flutter_tools/lib/src/commands/drive.dart

@@ -470,14 +470,14 @@ void restoreTestRunner() {
 Future<void> _runTests(List<String> testArgs, Map<String, String> environment) async {
   globals.printTrace('Running driver tests.');
 
-  PackageMap.globalPackagesPath = globals.fs.path.normalize(globals.fs.path.absolute(PackageMap.globalPackagesPath));
+  globalPackagesPath = globals.fs.path.normalize(globals.fs.path.absolute(globalPackagesPath));
   final String dartVmPath = globals.fs.path.join(dartSdkPath, 'bin', 'dart');
   final int result = await processUtils.stream(
     <String>[
       dartVmPath,
       ...dartVmFlags,
       ...testArgs,
-      '--packages=${PackageMap.globalPackagesPath}',
+      '--packages=$globalPackagesPath',
       '-rexpanded',
     ],
     environment: environment,

packages/flutter_tools/lib/src/commands/inject_plugins.dart

@@ -29,7 +29,7 @@ class InjectPluginsCommand extends FlutterCommand {
   @override
   Future<FlutterCommandResult> runCommand() async {
     final FlutterProject project = FlutterProject.current();
-    refreshPluginsList(project, checkProjects: true);
+    await refreshPluginsList(project, checkProjects: true);
     await injectPlugins(project, checkProjects: true);
     final bool result = hasPlugins(project);
     if (result) {

packages/flutter_tools/lib/src/dart/package_map.dart

@@ -2,86 +2,53 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:typed_data';
+
 import 'package:meta/meta.dart';
-// TODO(bkonyi): remove deprecated member usage, https://github.com/flutter/flutter/issues/51951
-// ignore: deprecated_member_use
-import 'package:package_config/packages_file.dart' as packages_file;
+import 'package:package_config/package_config.dart';
 
+import '../base/common.dart';
 import '../base/file_system.dart';
-import '../globals.dart' as globals hide fs;
+import '../base/logger.dart';
 
 const String kPackagesFileName = '.packages';
 
-Map<String, Uri> _parse(String packagesPath, FileSystem fileSystem) {
-  final List<int> source = fileSystem.file(packagesPath).readAsBytesSync();
-  return packages_file.parse(source,
-      Uri.file(packagesPath, windows: globals.platform.isWindows));
-}
-
-class PackageMap {
-  PackageMap(this.packagesPath, {
-    @required FileSystem fileSystem,
-  }) : _fileSystem = fileSystem;
-
-  /// Create a [PackageMap] for testing.
-  PackageMap.test(Map<String, Uri> input, {
-    @required FileSystem fileSystem,
-  }) : packagesPath = '.packages',
-       _map = input,
-       _fileSystem = fileSystem;
-
-  final FileSystem _fileSystem;
-
-  static String get globalPackagesPath => _globalPackagesPath ?? kPackagesFileName;
-
-  static set globalPackagesPath(String value) {
-    _globalPackagesPath = value;
-  }
-
-  static bool get isUsingCustomPackagesPath => _globalPackagesPath != null;
+String get globalPackagesPath => _globalPackagesPath ?? kPackagesFileName;
 
-  static String _globalPackagesPath;
-
-  final String packagesPath;
-
-  /// Load and parses the .packages file.
-  void load() {
-    _map ??= _parse(packagesPath, _fileSystem);
-  }
-
-  Map<String, Uri> get map {
-    load();
-    return _map;
-  }
-  Map<String, Uri> _map;
-
-  /// Returns the path to [packageUri].
-  String pathForPackage(Uri packageUri) => uriForPackage(packageUri).path;
-
-  /// Returns the path to [packageUri] as URL.
-  Uri uriForPackage(Uri packageUri) {
-    assert(packageUri.scheme == 'package');
-    final List<String> pathSegments = packageUri.pathSegments.toList();
-    final String packageName = pathSegments.removeAt(0);
-    final Uri packageBase = map[packageName];
-    if (packageBase == null) {
-      return null;
-    }
-    final String packageRelativePath = _fileSystem.path.joinAll(pathSegments);
-    return packageBase.resolveUri(_fileSystem.path.toUri(packageRelativePath));
-  }
+set globalPackagesPath(String value) {
+  _globalPackagesPath = value;
+}
 
-  String checkValid() {
-    if (_fileSystem.isFileSync(packagesPath)) {
-      return null;
-    }
-    String message = '$packagesPath does not exist.';
-    final String pubspecPath = _fileSystem.path.absolute(_fileSystem.path.dirname(packagesPath), 'pubspec.yaml');
-    if (_fileSystem.isFileSync(pubspecPath)) {
-      message += '\nDid you run "flutter pub get" in this directory?';
-    } else {
-      message += '\nDid you run this command from the same directory as your pubspec.yaml file?';
+bool get isUsingCustomPackagesPath => _globalPackagesPath != null;
+
+String _globalPackagesPath;
+
+/// Load the package configuration from [file] or throws a [ToolExit]
+/// if the operation would fail.
+Future<PackageConfig> loadPackageConfigOrFail(File file, {
+  @required Logger logger,
+}) {
+  final FileSystem fileSystem = file.fileSystem;
+  return loadPackageConfigUri(
+    file.absolute.uri,
+    loader: (Uri uri) {
+      final File configFile = fileSystem.file(uri);
+      if (!configFile.existsSync()) {
+        return null;
+      }
+      return Future<Uint8List>.value(configFile.readAsBytesSync());
+    },
+    onError: (dynamic error) {
+      logger.printTrace(error.toString());
+      String message = '${file.path} does not exist.';
+      final String pubspecPath = fileSystem.path.absolute(fileSystem.path.dirname(file.path), 'pubspec.yaml');
+      if (fileSystem.isFileSync(pubspecPath)) {
+        message += '\nDid you run "flutter pub get" in this directory?';
+      } else {
+        message += '\nDid you run this command from the same directory as your pubspec.yaml file?';
+      }
+      logger.printError(message);
+      throwToolExit(null);
     }
-    return message;
-  }
+  );
 }

packages/flutter_tools/lib/src/macos/cocoapod_utils.dart

@@ -16,7 +16,7 @@ import '../project.dart';
 Future<void> processPodsIfNeeded(XcodeBasedProject xcodeProject, String buildDirectory, BuildMode buildMode) async {
   final FlutterProject project = xcodeProject.parent;
   // Ensure that the plugin list is up to date, since hasPlugins relies on it.
-  refreshPluginsList(project);
+  await refreshPluginsList(project);
   if (!(hasPlugins(project) || (project.isModule && xcodeProject.podfile.existsSync()))) {
     return;
   }

packages/flutter_tools/lib/src/plugins.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 
 import 'package:meta/meta.dart';
+import 'package:package_config/package_config.dart';
 import 'package:yaml/yaml.dart';
 
 import 'android/gradle.dart';
@@ -298,26 +299,23 @@ Plugin _pluginFromPackage(String name, Uri packageRoot) {
   );
 }
 
-List<Plugin> findPlugins(FlutterProject project) {
+Future<List<Plugin>> findPlugins(FlutterProject project) async {
   final List<Plugin> plugins = <Plugin>[];
-  Map<String, Uri> packages;
-  try {
-    final String packagesFile = globals.fs.path.join(
-      project.directory.path,
-      PackageMap.globalPackagesPath,
-    );
-    packages = PackageMap(packagesFile, fileSystem: globals.fs).map;
-  } on FormatException catch (e) {
-    globals.printTrace('Invalid .packages file: $e');
-    return plugins;
-  }
-  packages.forEach((String name, Uri uri) {
-    final Uri packageRoot = uri.resolve('..');
-    final Plugin plugin = _pluginFromPackage(name, packageRoot);
+  final String packagesFile = globals.fs.path.join(
+    project.directory.path,
+    globalPackagesPath,
+  );
+  final PackageConfig packageConfig = await loadPackageConfigOrFail(
+    globals.fs.file(packagesFile),
+    logger: globals.logger,
+  );
+  for (final Package package in packageConfig.packages) {
+    final Uri packageRoot = package.packageUriRoot.resolve('..');
+    final Plugin plugin = _pluginFromPackage(package.name, packageRoot);
     if (plugin != null) {
       plugins.add(plugin);
     }
-  });
+  }
   return plugins;
 }
 
@@ -1065,8 +1063,8 @@ void _createPlatformPluginSymlinks(Directory symlinkDirectory, List<dynamic> pla
 /// which already exist.
 ///
 /// Assumes `pub get` has been executed since last change to `pubspec.yaml`.
-void refreshPluginsList(FlutterProject project, {bool checkProjects = false}) {
-  final List<Plugin> plugins = findPlugins(project);
+Future<void> refreshPluginsList(FlutterProject project, {bool checkProjects = false}) async {
+  final List<Plugin> plugins = await findPlugins(project);
 
   // TODO(franciscojma): Remove once migration is complete.
   // Write the legacy plugin files to avoid breaking existing apps.
@@ -1093,7 +1091,7 @@ void refreshPluginsList(FlutterProject project, {bool checkProjects = false}) {
 ///
 /// Assumes [refreshPluginsList] has been called since last change to `pubspec.yaml`.
 Future<void> injectPlugins(FlutterProject project, {bool checkProjects = false}) async {
-  final List<Plugin> plugins = findPlugins(project);
+  final List<Plugin> plugins = await findPlugins(project);
   if ((checkProjects && project.android.existsSync()) || !checkProjects) {
     await _writeAndroidPluginRegistrant(project, plugins);
   }

packages/flutter_tools/lib/src/project.dart

@@ -226,7 +226,7 @@ class FlutterProject {
     if (!directory.existsSync() || hasExampleApp) {
       return;
     }
-    refreshPluginsList(this);
+    await refreshPluginsList(this);
     if ((android.existsSync() && checkProjects) || !checkProjects) {
       await android.ensureReadyForPlatformSpecificTooling();
     }

packages/flutter_tools/lib/src/resident_runner.dart

@@ -59,7 +59,7 @@ class FlutterDevice {
          targetModel: targetModel,
          experimentalFlags: experimentalFlags,
          dartDefines: buildInfo.dartDefines,
-         packagesPath: PackageMap.globalPackagesPath,
+         packagesPath: globalPackagesPath,
        );
 
   /// Create a [FlutterDevice] with optional code generation enabled.
@@ -107,7 +107,7 @@ class FlutterDevice {
         dartDefines: buildInfo.dartDefines,
         librariesSpec: globals.fs.file(globals.artifacts
           .getArtifactPath(Artifact.flutterWebLibrariesJson)).uri.toString(),
-        packagesPath: PackageMap.globalPackagesPath,
+        packagesPath: globalPackagesPath,
       );
     } else {
       generator = ResidentCompiler(
@@ -124,7 +124,7 @@ class FlutterDevice {
         experimentalFlags: experimentalFlags,
         dartDefines: buildInfo.dartDefines,
         initializeFromDill: globals.fs.path.join(getBuildDirectory(), 'cache.dill'),
-        packagesPath: PackageMap.globalPackagesPath,
+        packagesPath: globalPackagesPath,
       );
     }
 
@@ -665,7 +665,7 @@ abstract class ResidentRunner {
     String dillOutputPath,
   }) : mainPath = findMainDartFile(target),
        projectRootPath = projectRootPath ?? globals.fs.currentDirectory.path,
-       packagesFilePath = packagesFilePath ?? globals.fs.path.absolute(PackageMap.globalPackagesPath),
+       packagesFilePath = packagesFilePath ?? globals.fs.path.absolute(globalPackagesPath),
        _dillOutputPath = dillOutputPath,
        artifactDirectory = dillOutputPath == null
           ? globals.fs.systemTempDirectory.createTempSync('flutter_tool.')

packages/flutter_tools/lib/src/run_hot.dart

@@ -157,15 +157,9 @@ class HotRunner extends ResidentRunner {
     final Stopwatch stopwatch = Stopwatch()..start();
     final UpdateFSReport results = UpdateFSReport(success: true);
     final List<Uri> invalidated =  <Uri>[Uri.parse(libraryId)];
-    final PackageConfig packageConfig = await loadPackageConfigUri(
-      globals.fs.file(PackageMap.globalPackagesPath).absolute.uri,
-      loader: (Uri uri) {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    final PackageConfig packageConfig = await loadPackageConfigOrFail(
+      globals.fs.file(globalPackagesPath),
+      logger: globals.logger,
     );
     for (final FlutterDevice device in flutterDevices) {
       results.incorporateResults(await device.updateDevFS(
@@ -361,15 +355,9 @@ class HotRunner extends ResidentRunner {
     firstBuildTime = DateTime.now();
 
     final List<Future<bool>> startupTasks = <Future<bool>>[];
-    final PackageConfig packageConfig = await loadPackageConfigUri(
-      globals.fs.file(PackageMap.globalPackagesPath).absolute.uri,
-      loader: (Uri uri) {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    final PackageConfig packageConfig = await loadPackageConfigOrFail(
+      globals.fs.file(globalPackagesPath),
+      logger: globals.logger,
     );
     for (final FlutterDevice device in flutterDevices) {
       // Here we initialize the frontend_server concurrently with the platform
@@ -1301,15 +1289,9 @@ class ProjectFileInvalidator {
   }
 
   Future<PackageConfig> _createPackageConfig(String packagesPath) {
-    return loadPackageConfigUri(
-      _fileSystem.file(packagesPath).absolute.uri,
-      loader: (Uri uri) {
-        final File file = _fileSystem.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    return loadPackageConfigOrFail(
+      _fileSystem.file(globalPackagesPath),
+      logger: _logger,
     );
   }
 }

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -818,7 +818,7 @@ abstract class FlutterCommand extends Command<void> {
   @protected
   @mustCallSuper
   Future<void> validateCommand() async {
-    if (_requiresPubspecYaml && !PackageMap.isUsingCustomPackagesPath) {
+    if (_requiresPubspecYaml && !isUsingCustomPackagesPath) {
       // Don't expect a pubspec.yaml file if the user passed in an explicit .packages file path.
 
       // If there is no pubspec in the current directory, look in the parent
@@ -835,14 +835,6 @@ abstract class FlutterCommand extends Command<void> {
       if (changedDirectory) {
         globals.printStatus('Changing current working directory to: ${globals.fs.currentDirectory.path}');
       }
-
-      // Validate the current package map only if we will not be running "pub get" later.
-      if (parent?.name != 'pub' && !(_usesPubOption && boolArg('pub'))) {
-        final String error = PackageMap(PackageMap.globalPackagesPath, fileSystem: globals.fs).checkValid();
-        if (error != null) {
-          throw ToolExit(error);
-        }
-      }
     }
 
     if (_usesTargetOption) {

packages/flutter_tools/lib/src/runner/flutter_command_runner.dart

@@ -314,7 +314,7 @@ class FlutterCommandRunner extends CommandRunner<void> {
         }
 
         if (topLevelResults.wasParsed('packages')) {
-          PackageMap.globalPackagesPath = globals.fs.path.normalize(globals.fs.path.absolute(topLevelResults['packages'] as String));
+          globalPackagesPath = globals.fs.path.normalize(globals.fs.path.absolute(topLevelResults['packages'] as String));
         }
 
         // See if the user specified a specific device.
@@ -354,19 +354,9 @@ class FlutterCommandRunner extends CommandRunner<void> {
 
     if (engineSourcePath == null && globalResults['local-engine'] != null) {
       try {
-        final PackageConfig packageConfig = await loadPackageConfigUri(
-          globals.fs.file(PackageMap.globalPackagesPath).absolute.uri,
-          onError: (dynamic error) {
-            // Errors indicate the automatic detection will fail, but are not
-            // fatal.
-          },
-          loader: (Uri uri) {
-            final File file = globals.fs.file(uri);
-            if (!file.existsSync()) {
-              return null;
-            }
-            return file.readAsBytes();
-          },
+        final PackageConfig packageConfig = await loadPackageConfigOrFail(
+          globals.fs.file(globalPackagesPath),
+          logger: globals.logger,
         );
         Uri engineUri = packageConfig[kFlutterEnginePackageName]?.packageUriRoot;
         // Skip if sky_engine is the self-contained one.

packages/flutter_tools/lib/src/template.dart

@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 import 'package:meta/meta.dart';
+import 'package:package_config/package_config.dart';
+import 'package:package_config/package_config_types.dart';
 
 import 'base/common.dart';
 import 'base/file_system.dart';
@@ -247,8 +249,11 @@ Future<Directory> _templateImageDirectory(String name, FileSystem fileSystem) as
   if (!fileSystem.file(packageFilePath).existsSync()) {
     await _ensurePackageDependencies(toolPackagePath);
   }
-  final PackageMap packageConfig = PackageMap(packageFilePath, fileSystem: fileSystem);
-  final Uri imagePackageLibDir = packageConfig.map['flutter_template_images'];
+  final PackageConfig packageConfig = await loadPackageConfigOrFail(
+    fileSystem.file(packageFilePath),
+    logger: globals.logger,
+  );
+  final Uri imagePackageLibDir = packageConfig['flutter_template_images']?.packageUriRoot;
   // Ensure that the template image package is present.
   if (imagePackageLibDir == null || !fileSystem.directory(imagePackageLibDir).existsSync()) {
     await _ensurePackageDependencies(toolPackagePath);

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

@@ -115,7 +115,7 @@ class CoverageCollector extends TestWatcher {
       return null;
     }
     if (formatter == null) {
-      final coverage.Resolver resolver = coverage.Resolver(packagesPath: PackageMap.globalPackagesPath);
+      final coverage.Resolver resolver = coverage.Resolver(packagesPath: globalPackagesPath);
       final String packagePath = globals.fs.currentDirectory.path;
       final List<String> reportOn = coverageDirectory == null
         ? <String>[globals.fs.path.join(packagePath, 'lib')]

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

@@ -459,7 +459,7 @@ class FlutterPlatform extends PlatformPlugin {
       final Process process = await _startProcess(
         shellPath,
         mainDart,
-        packages: PackageMap.globalPackagesPath,
+        packages: globalPackagesPath,
         enableObservatory: enableObservatory,
         startPaused: startPaused,
         disableServiceAuthCodes: disableServiceAuthCodes,

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

@@ -97,32 +97,20 @@ class FlutterWebPlatform extends PlatformPlugin {
     );
   }
 
-  final Future<PackageConfig> _packagesFuture = loadPackageConfigUri(
-    Uri.base.resolve('.packages'),
-    loader: (Uri uri) {
-      final File file = globals.fs.file(uri);
-      if (!file.existsSync()) {
-        return null;
-      }
-      return file.readAsBytes();
-    }
+  final Future<PackageConfig> _packagesFuture = loadPackageConfigOrFail(
+    globals.fs.file(globalPackagesPath),
+    logger: globals.logger,
   );
 
-  final Future<PackageConfig> _flutterToolsPackageMap = loadPackageConfigUri(
+  final Future<PackageConfig> _flutterToolsPackageMap = loadPackageConfigOrFail(
     globals.fs.file(globals.fs.path.join(
       Cache.flutterRoot,
       'packages',
       'flutter_tools',
       '.packages',
-    )).absolute.uri,
-      loader: (Uri uri) {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
-    );
+    )),
+    logger: globals.logger,
+  );
 
   /// Uri of the test package.
   Future<Uri> get testUri async => (await _flutterToolsPackageMap)['test']?.packageUriRoot;
@@ -874,7 +862,7 @@ class TestGoldenComparator {
       shellPath,
       '--disable-observatory',
       '--non-interactive',
-      '--packages=${PackageMap.globalPackagesPath}',
+      '--packages=$globalPackagesPath',
       output,
     ];
 

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

@@ -179,8 +179,8 @@ class _FlutterTestRunnerImpl implements FlutterTestRunner {
 
     // Make the global packages path absolute.
     // (Makes sure it still works after we change the current directory.)
-    PackageMap.globalPackagesPath =
-        globals.fs.path.normalize(globals.fs.path.absolute(PackageMap.globalPackagesPath));
+    globalPackagesPath =
+        globals.fs.path.normalize(globals.fs.path.absolute(globalPackagesPath));
 
     // Call package:test's main method in the appropriate directory.
     final Directory saved = globals.fs.currentDirectory;

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

@@ -103,7 +103,7 @@ class TestCompiler {
       initializeFromDill: testFilePath,
       unsafePackageSerialization: false,
       dartDefines: const <String>[],
-      packagesPath: PackageMap.globalPackagesPath,
+      packagesPath: globalPackagesPath,
     );
     if (flutterProject.hasBuilders) {
       return CodeGeneratingResidentCompiler.create(
@@ -126,15 +126,9 @@ class TestCompiler {
     if (!isEmpty) {
       return;
     }
-    _packageConfig ??= await loadPackageConfigUri(
-      globals.fs.file(PackageMap.globalPackagesPath).absolute.uri,
-      loader: (Uri uri) async {
-        final File file = globals.fs.file(uri);
-        if (!file.existsSync()) {
-          return null;
-        }
-        return file.readAsBytes();
-      }
+    _packageConfig ??= await loadPackageConfigOrFail(
+      globals.fs.file(globalPackagesPath),
+      logger: globals.logger,
     );
     while (compilationQueue.isNotEmpty) {
       final _CompilationRequest request = compilationQueue.first;

packages/flutter_tools/lib/src/tester/flutter_tester.dart

@@ -128,7 +128,7 @@ class FlutterTesterDevice extends Device {
       '--run-forever',
       '--non-interactive',
       '--enable-dart-profiling',
-      '--packages=${PackageMap.globalPackagesPath}',
+      '--packages=$globalPackagesPath',
     ];
     if (debuggingOptions.debuggingEnabled) {
       if (debuggingOptions.startPaused) {

packages/flutter_tools/lib/src/web/compile.dart

@@ -32,7 +32,7 @@ Future<void> buildWeb(
   if (!flutterProject.web.existsSync()) {
     throwToolExit('Missing index.html.');
   }
-  final bool hasWebPlugins = findPlugins(flutterProject)
+  final bool hasWebPlugins = (await findPlugins(flutterProject))
     .any((Plugin p) => p.platforms.containsKey(WebPlugin.kConfigKey));
   await injectPlugins(flutterProject, checkProjects: true);
   final Status status = globals.logger.startProgress('Compiling $target for the Web...', timeout: null);

packages/flutter_tools/test/general.shard/build_system/targets/web_test.dart

@@ -46,7 +46,7 @@ void main() {
       final File packagesFile = globals.fs.file(globals.fs.path.join('foo', '.packages'))
         ..createSync(recursive: true)
         ..writeAsStringSync('foo:lib/\n');
-      PackageMap.globalPackagesPath = packagesFile.path;
+      globalPackagesPath = packagesFile.path;
       globals.fs.currentDirectory.childDirectory('bar').createSync();
       processManager = FakeProcessManager.list(<FakeCommand>[]);
 

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

@@ -104,7 +104,7 @@ void main() {
 
       // Set up a simple .packages file for all the tests to use, pointing to one package.
       dummyPackageDirectory = fs.directory('/pubcache/apackage/lib/');
-      packagesFile = fs.file(fs.path.join(flutterProject.directory.path, PackageMap.globalPackagesPath));
+      packagesFile = fs.file(fs.path.join(flutterProject.directory.path, globalPackagesPath));
       packagesFile..createSync(recursive: true)
           ..writeAsStringSync('apackage:file://${dummyPackageDirectory.path}\n');
     });
@@ -359,8 +359,9 @@ EndGlobal''');
     }
 
     group('refreshPlugins', () {
-      testUsingContext('Refreshing the plugin list is a no-op when the plugins list stays empty', () {
-        refreshPluginsList(flutterProject);
+      testUsingContext('Refreshing the plugin list is a no-op when the plugins list stays empty', () async {
+        await refreshPluginsList(flutterProject);
+
         expect(flutterProject.flutterPluginsFile.existsSync(), false);
         expect(flutterProject.flutterPluginsDependenciesFile.existsSync(), false);
       }, overrides: <Type, Generator>{
@@ -368,11 +369,12 @@ EndGlobal''');
         ProcessManager: () => FakeProcessManager.any(),
       });
 
-      testUsingContext('Refreshing the plugin list deletes the plugin file when there were plugins but no longer are', () {
+      testUsingContext('Refreshing the plugin list deletes the plugin file when there were plugins but no longer are', () async {
         flutterProject.flutterPluginsFile.createSync();
         flutterProject.flutterPluginsDependenciesFile.createSync();
 
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
+
         expect(flutterProject.flutterPluginsFile.existsSync(), false);
         expect(flutterProject.flutterPluginsDependenciesFile.existsSync(), false);
       }, overrides: <Type, Generator>{
@@ -380,11 +382,12 @@ EndGlobal''');
         ProcessManager: () => FakeProcessManager.any(),
       });
 
-      testUsingContext('Refreshing the plugin list creates a plugin directory when there are plugins', () {
+      testUsingContext('Refreshing the plugin list creates a plugin directory when there are plugins', () async {
         configureDummyPackageAsPlugin();
         when(iosProject.existsSync()).thenReturn(true);
 
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
+
         expect(flutterProject.flutterPluginsFile.existsSync(), true);
         expect(flutterProject.flutterPluginsDependenciesFile.existsSync(), true);
       }, overrides: <Type, Generator>{
@@ -392,7 +395,9 @@ EndGlobal''');
         ProcessManager: () => FakeProcessManager.any(),
       });
 
-      testUsingContext('Refreshing the plugin list modifies .flutter-plugins and .flutter-plugins-dependencies when there are plugins', () {
+      testUsingContext(
+        'Refreshing the plugin list modifies .flutter-plugins '
+        'and .flutter-plugins-dependencies when there are plugins', () async {
         final Directory pluginA = createPluginWithDependencies(name: 'plugin-a', dependencies: const <String>['plugin-b', 'plugin-c', 'random-package']);
         final Directory pluginB = createPluginWithDependencies(name: 'plugin-b', dependencies: const <String>['plugin-c']);
         final Directory pluginC = createPluginWithDependencies(name: 'plugin-c', dependencies: const <String>[]);
@@ -407,7 +412,7 @@ EndGlobal''');
           (Invocation _) => version
         );
 
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
 
         // Verify .flutter-plugins-dependencies is configured correctly.
         expect(flutterProject.flutterPluginsFile.existsSync(), true);
@@ -494,13 +499,14 @@ EndGlobal''');
         FlutterVersion: () => mockVersion
       });
 
-      testUsingContext('Changes to the plugin list invalidates the Cocoapod lockfiles', () {
+      testUsingContext('Changes to the plugin list invalidates the Cocoapod lockfiles', () async {
         simulatePodInstallRun(iosProject);
         simulatePodInstallRun(macosProject);
         configureDummyPackageAsPlugin();
         when(iosProject.existsSync()).thenReturn(true);
         when(macosProject.existsSync()).thenReturn(true);
-        refreshPluginsList(flutterProject);
+
+        await refreshPluginsList(flutterProject);
         expect(iosProject.podManifestLock.existsSync(), false);
         expect(macosProject.podManifestLock.existsSync(), false);
       }, overrides: <Type, Generator>{
@@ -510,7 +516,7 @@ EndGlobal''');
         FlutterVersion: () => mockVersion
       });
 
-      testUsingContext('No changes to the plugin list does not invalidate the Cocoapod lockfiles', () {
+      testUsingContext('No changes to the plugin list does not invalidate the Cocoapod lockfiles', () async {
         configureDummyPackageAsPlugin();
         when(iosProject.existsSync()).thenReturn(true);
         when(macosProject.existsSync()).thenReturn(true);
@@ -519,11 +525,11 @@ EndGlobal''');
         // Since there was no plugins list, the lock files will be invalidated.
         // The second call is where the plugins list is compared to the existing one, and if there is no change,
         // the podfiles shouldn't be invalidated.
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
         simulatePodInstallRun(iosProject);
         simulatePodInstallRun(macosProject);
 
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
         expect(iosProject.podManifestLock.existsSync(), true);
         expect(macosProject.podManifestLock.existsSync(), true);
       }, overrides: <Type, Generator>{
@@ -1081,11 +1087,11 @@ flutter:
         when(featureFlags.isWindowsEnabled).thenReturn(true);
       });
 
-      testUsingContext('Symlinks are created for Linux plugins', () {
+      testUsingContext('Symlinks are created for Linux plugins', () async {
         when(linuxProject.existsSync()).thenReturn(true);
         configureDummyPackageAsPlugin();
         // refreshPluginsList should call createPluginSymlinks.
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
 
         expect(linuxProject.pluginSymlinkDirectory.childLink('apackage').existsSync(), true);
       }, overrides: <Type, Generator>{
@@ -1094,11 +1100,11 @@ flutter:
         FeatureFlags: () => featureFlags,
       });
 
-      testUsingContext('Symlinks are created for Windows plugins', () {
+      testUsingContext('Symlinks are created for Windows plugins', () async {
         when(windowsProject.existsSync()).thenReturn(true);
         configureDummyPackageAsPlugin();
         // refreshPluginsList should call createPluginSymlinks.
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
 
         expect(windowsProject.pluginSymlinkDirectory.childLink('apackage').existsSync(), true);
       }, overrides: <Type, Generator>{
@@ -1130,7 +1136,7 @@ flutter:
         FeatureFlags: () => featureFlags,
       });
 
-      testUsingContext('Existing symlinks are removed automatically on refresh when no longer in use', () {
+      testUsingContext('Existing symlinks are removed automatically on refresh when no longer in use', () async {
         when(linuxProject.existsSync()).thenReturn(true);
         when(windowsProject.existsSync()).thenReturn(true);
 
@@ -1144,7 +1150,7 @@ flutter:
 
         // refreshPluginsList should remove existing links and recreate on changes.
         configureDummyPackageAsPlugin();
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
 
         for (final File file in dummyFiles) {
           expect(file.existsSync(), false);
@@ -1179,11 +1185,11 @@ flutter:
         FeatureFlags: () => featureFlags,
       });
 
-      testUsingContext('createPluginSymlinks repairs missing links', () {
+      testUsingContext('createPluginSymlinks repairs missing links', () async {
         when(linuxProject.existsSync()).thenReturn(true);
         when(windowsProject.existsSync()).thenReturn(true);
         configureDummyPackageAsPlugin();
-        refreshPluginsList(flutterProject);
+        await refreshPluginsList(flutterProject);
 
         final List<Link> links = <Link>[
           linuxProject.pluginSymlinkDirectory.childLink('apackage'),

packages/flutter_tools/test/general.shard/runner/flutter_command_runner_test.dart

@@ -116,11 +116,13 @@ void main() {
         fs.directory('$_kArbitraryEngineRoot/src/out/ios_debug/gen/dart-pkg/sky_engine/lib/').createSync(recursive: true);
         fs.directory('$_kArbitraryEngineRoot/src/out/host_debug').createSync(recursive: true);
         fs.file(_kDotPackages).writeAsStringSync('sky_engine:file://$_kArbitraryEngineRoot/src/out/ios_debug/gen/dart-pkg/sky_engine/lib/');
+
         await runner.run(<String>['dummy', '--local-engine=ios_debug']);
 
         // Verify that this also works if the sky_engine path is a symlink to the engine root.
         fs.link('/symlink').createSync(_kArbitraryEngineRoot);
         fs.file(_kDotPackages).writeAsStringSync('sky_engine:file:///symlink/src/out/ios_debug/gen/dart-pkg/sky_engine/lib/');
+
         await runner.run(<String>['dummy', '--local-engine=ios_debug']);
       }, overrides: <Type, Generator>{
         FileSystem: () => fs,
@@ -129,8 +131,10 @@ void main() {
       }, initializeFlutterRoot: false);
 
       testUsingContext('works if --local-engine is specified and --local-engine-src-path is specified', () async {
+        fs.file(_kDotPackages).writeAsStringSync('\n');
         fs.directory('$_kArbitraryEngineRoot/src/out/ios_debug').createSync(recursive: true);
         fs.directory('$_kArbitraryEngineRoot/src/out/host_debug').createSync(recursive: true);
+
         await runner.run(<String>['dummy', '--local-engine-src-path=$_kArbitraryEngineRoot/src', '--local-engine=ios_debug']);
       }, overrides: <Type, Generator>{
         FileSystem: () => fs,
@@ -139,8 +143,10 @@ void main() {
       }, initializeFlutterRoot: false);
 
       testUsingContext('works if --local-engine is specified and --local-engine-src-path is determined by flutter root', () async {
+        fs.file(_kDotPackages).writeAsStringSync('\n');
         fs.directory('$_kEngineRoot/src/out/ios_debug').createSync(recursive: true);
         fs.directory('$_kEngineRoot/src/out/host_debug').createSync(recursive: true);
+
         await runner.run(<String>['dummy', '--local-engine=ios_debug']);
       }, overrides: <Type, Generator>{
         FileSystem: () => fs,