Migrate .packages -> package_config.json (#99677)

packages/flutter_tools/lib/src/build_info.dart

@@ -36,7 +36,7 @@ class BuildInfo {
     List<String>? dartExperiments,
     required this.treeShakeIcons,
     this.performanceMeasurementFile,
-    this.packagesPath = '.packages', // TODO(zanderso): make this required and remove the default.
+    this.packagesPath = '.dart_tool/package_config.json', // TODO(zanderso): make this required and remove the default.
     this.nullSafetyMode = NullSafetyMode.sound,
     this.codeSizeDirectory,
     this.androidGradleDaemon = true,
@@ -67,10 +67,10 @@ class BuildInfo {
   /// Mode-Flavor (e.g. Release-Paid).
   final String? flavor;
 
-  /// The path to the .packages file to use for compilation.
+  /// The path to the package configuration file to use for compilation.
   ///
   /// This is used by package:package_config to locate the actual package_config.json
-  /// file. If not provided, defaults to `.packages`.
+  /// file. If not provided, defaults to `.dart_tool/packages`.
   final String packagesPath;
 
   final List<String> fileSystemRoots;

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

@@ -378,8 +378,7 @@ class TestCommand extends FlutterCommand with DeviceBasedDevelopmentArtifacts {
       collector = CoverageCollector(
         verbose: !machine,
         libraryPredicate: (String libraryName) => libraryName.contains(projectName),
-        packagesPath: globals.fs.file(buildInfo.packagesPath)
-          .parent.parent.childFile('.packages').path
+        packagesPath: buildInfo.packagesPath
       );
     }
 

packages/flutter_tools/test/commands.shard/permeable/create_test.dart

@@ -3001,8 +3001,9 @@ Future<void> _ensureFlutterToolsSnapshot() async {
     'cache',
     'flutter_tools.snapshot',
   ));
-  final String dotPackages = globals.fs.path.absolute(globals.fs.path.join(
-    '.packages',
+  final String packageConfig = globals.fs.path.absolute(globals.fs.path.join(
+    '.dart_tool',
+    'package_config.json'
   ));
 
   final File snapshotFile = globals.fs.file(flutterToolsSnapshotPath);
@@ -3012,7 +3013,7 @@ Future<void> _ensureFlutterToolsSnapshot() async {
 
   final List<String> snapshotArgs = <String>[
     '--snapshot=$flutterToolsSnapshotPath',
-    '--packages=$dotPackages',
+    '--packages=$packageConfig',
     flutterToolsPath,
   ];
   final ProcessResult snapshotResult = await Process.run(

packages/flutter_tools/test/commands.shard/permeable/packages_test.dart

@@ -106,8 +106,8 @@ void main() {
       );
     }
 
-    const List<String> pubOutput = <String>[
-      '.packages',
+    final List<String> pubOutput = <String>[
+      globals.fs.path.join('.dart_tool', 'package_config.json'),
       'pubspec.lock',
     ];
 

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

@@ -117,7 +117,7 @@ void main() {
       extraFrontEndOptions: <String>['--enable-experiment=non-nullable', 'bar'],
       extraGenSnapshotOptions: <String>['--enable-experiment=non-nullable', 'fizz'],
       bundleSkSLPath: 'foo/bar/baz.sksl.json',
-      packagesPath: 'foo/.packages',
+      packagesPath: 'foo/.dart_tool/package_config.json',
       codeSizeDirectory: 'foo/code-size',
       fileSystemRoots: <String>['test5', 'test6'],
       fileSystemScheme: 'scheme',
@@ -149,7 +149,7 @@ void main() {
       extraFrontEndOptions: <String>['--enable-experiment=non-nullable', 'bar'],
       extraGenSnapshotOptions: <String>['--enable-experiment=non-nullable', 'fizz'],
       bundleSkSLPath: 'foo/bar/baz.sksl.json',
-      packagesPath: 'foo/.packages',
+      packagesPath: 'foo/.dart_tool/package_config.json',
       codeSizeDirectory: 'foo/code-size',
       // These values are ignored by toEnvironmentConfig
       androidProjectArgs: <String>['foo=bar', 'fizz=bazz']
@@ -164,7 +164,7 @@ void main() {
       'EXTRA_FRONT_END_OPTIONS': '--enable-experiment=non-nullable,bar',
       'EXTRA_GEN_SNAPSHOT_OPTIONS': '--enable-experiment=non-nullable,fizz',
       'BUNDLE_SKSL_PATH': 'foo/bar/baz.sksl.json',
-      'PACKAGE_CONFIG': 'foo/.packages',
+      'PACKAGE_CONFIG': 'foo/.dart_tool/package_config.json',
       'CODE_SIZE_DIRECTORY': 'foo/code-size',
     });
   });
@@ -179,7 +179,7 @@ void main() {
       extraFrontEndOptions: <String>['--enable-experiment=non-nullable', 'bar'],
       extraGenSnapshotOptions: <String>['--enable-experiment=non-nullable', 'fizz'],
       bundleSkSLPath: 'foo/bar/baz.sksl.json',
-      packagesPath: 'foo/.packages',
+      packagesPath: 'foo/.dart_tool/package_config.json',
       codeSizeDirectory: 'foo/code-size',
       androidProjectArgs: <String>['foo=bar', 'fizz=bazz']
     );

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

@@ -286,7 +286,6 @@ class TestFlutterTesterDevice extends FlutterTesterTestDevice {
         BuildMode.debug,
         '',
         treeShakeIcons: false,
-        packagesPath: '.dart_tool/package_config.json',
       ),
       hostVmServicePort: 1234,
       dartEntrypointArgs: dartEntrypointArgs,

packages/flutter_tools/test/general.shard/tester/flutter_tester_test.dart

@@ -147,7 +147,7 @@ void main() {
           '--run-forever',
           '--non-interactive',
           '--enable-dart-profiling',
-          '--packages=.packages',
+          '--packages=.dart_tool/package_config.json',
           '--flutter-assets-dir=/.tmp_rand0/flutter_tester.rand0',
           '/.tmp_rand0/flutter_tester.rand0/flutter-tester-app.dill',
         ],