[flutter_plugin_tools] Support YAML exception lists (#4183)

Currently the tool accepts `--custom-analysis` to allow a list of packages for which custom `analysis_options.yaml` are allowed, and `--exclude` to exclude a set of packages when running a command against all, or all changed, packages. This results in these exception lists being embedded into CI configuration files (e.g., .cirrus.yaml) or scripts, which makes them harder to maintain, and harder to re-use in other contexts (local runs, new CI systems).

This adds support for both flags to accept paths to YAML files that contain the lists, so that they can be maintained separately, and with inline comments about the reasons things are on the lists.

Also updates the CI to use this new support, eliminating those lists from `.cirrus.yaml` and `tool_runner.sh`

Fixes flutter/flutter#86799

script/tool/CHANGELOG.md

@@ -1,5 +1,9 @@
 ## NEXT
 
+- `--exclude` and `--custom-analysis` now accept paths to YAML files that
+  contain lists of packages to exclude, in addition to just package names,
+  so that exclude lists can be maintained separately from scripts and CI
+  configuration.
 - Added an `xctest` flag to select specific test targets, to allow running only
   unit tests or integration tests.
 - **Breaking change**: Split Xcode analysis out of `xctest` and into a new

script/tool/lib/src/analyze_command.dart

@@ -6,6 +6,7 @@ import 'dart:async';
 
 import 'package:file/file.dart';
 import 'package:platform/platform.dart';
+import 'package:yaml/yaml.dart';
 
 import 'common/core.dart';
 import 'common/package_looping_command.dart';
@@ -23,7 +24,10 @@ class AnalyzeCommand extends PackageLoopingCommand {
   }) : super(packagesDir, processRunner: processRunner, platform: platform) {
     argParser.addMultiOption(_customAnalysisFlag,
         help:
-            'Directories (comma separated) that are allowed to have their own analysis options.',
+            'Directories (comma separated) that are allowed to have their own '
+            'analysis options.\n\n'
+            'Alternately, a list of one or more YAML files that contain a list '
+            'of allowed directories.',
         defaultsTo: <String>[]);
     argParser.addOption(_analysisSdk,
         valueHelp: 'dart-sdk',
@@ -37,6 +41,8 @@ class AnalyzeCommand extends PackageLoopingCommand {
 
   late String _dartBinaryPath;
 
+  Set<String> _allowedCustomAnalysisDirectories = const <String>{};
+
   @override
   final String name = 'analyze';
 
@@ -56,7 +62,7 @@ class AnalyzeCommand extends PackageLoopingCommand {
         continue;
       }
 
-      final bool allowed = (getStringListArg(_customAnalysisFlag)).any(
+      final bool allowed = _allowedCustomAnalysisDirectories.any(
           (String directory) =>
               directory.isNotEmpty &&
               path.isWithin(
@@ -107,6 +113,17 @@ class AnalyzeCommand extends PackageLoopingCommand {
       throw ToolExit(_exitPackagesGetFailed);
     }
 
+    _allowedCustomAnalysisDirectories =
+        getStringListArg(_customAnalysisFlag).expand<String>((String item) {
+      if (item.endsWith('.yaml')) {
+        final File file = packagesDir.fileSystem.file(item);
+        return (loadYaml(file.readAsStringSync()) as YamlList)
+            .toList()
+            .cast<String>();
+      }
+      return <String>[item];
+    }).toSet();
+
     // Use the Dart SDK override if one was passed in.
     final String? dartSdk = argResults![_analysisSdk] as String?;
     _dartBinaryPath =

script/tool/lib/src/common/plugin_command.dart

@@ -9,6 +9,7 @@ import 'package:file/file.dart';
 import 'package:git/git.dart';
 import 'package:path/path.dart' as p;
 import 'package:platform/platform.dart';
+import 'package:yaml/yaml.dart';
 
 import 'core.dart';
 import 'git_version_finder.dart';
@@ -48,7 +49,9 @@ abstract class PluginCommand extends Command<void> {
     argParser.addMultiOption(
       _excludeArg,
       abbr: 'e',
-      help: 'Exclude packages from this command.',
+      help: 'A list of packages to exclude from from this command.\n\n'
+          'Alternately, a list of one or more YAML files that contain a list '
+          'of packages to exclude.',
       defaultsTo: <String>[],
     );
     argParser.addFlag(_runOnChangedPackagesArg,
@@ -214,8 +217,18 @@ abstract class PluginCommand extends Command<void> {
   ///    of packages in the flutter/packages repository.
   Stream<Directory> _getAllPlugins() async* {
     Set<String> plugins = Set<String>.from(getStringListArg(_packagesArg));
+
     final Set<String> excludedPlugins =
-        Set<String>.from(getStringListArg(_excludeArg));
+        getStringListArg(_excludeArg).expand<String>((String item) {
+      if (item.endsWith('.yaml')) {
+        final File file = packagesDir.fileSystem.file(item);
+        return (loadYaml(file.readAsStringSync()) as YamlList)
+            .toList()
+            .cast<String>();
+      }
+      return <String>[item];
+    }).toSet();
+
     final bool runOnChangedPackages = getBoolArg(_runOnChangedPackagesArg);
     if (plugins.isEmpty &&
         runOnChangedPackages &&

script/tool/test/analyze_command_test.dart

@@ -176,6 +176,25 @@ void main() {
           ]));
     });
 
+    test('takes an allow config file', () async {
+      final Directory pluginDir = createFakePlugin('foo', packagesDir,
+          extraFiles: <String>['analysis_options.yaml']);
+      final File allowFile = packagesDir.childFile('custom.yaml');
+      allowFile.writeAsStringSync('- foo');
+
+      await runCapturingPrint(
+          runner, <String>['analyze', '--custom-analysis', allowFile.path]);
+
+      expect(
+          processRunner.recordedCalls,
+          orderedEquals(<ProcessCall>[
+            ProcessCall(
+                'flutter', const <String>['packages', 'get'], pluginDir.path),
+            ProcessCall('dart', const <String>['analyze', '--fatal-infos'],
+                pluginDir.path),
+          ]));
+    });
+
     // See: https://github.com/flutter/flutter/issues/78994
     test('takes an empty allow list', () async {
       createFakePlugin('foo', packagesDir,

script/tool/test/common/plugin_command_test.dart

@@ -172,6 +172,19 @@ void main() {
       expect(plugins, unorderedEquals(<String>[plugin2.path]));
     });
 
+    test('exclude accepts config files', () async {
+      createFakePlugin('plugin1', packagesDir);
+      final File configFile = packagesDir.childFile('exclude.yaml');
+      configFile.writeAsStringSync('- plugin1');
+
+      await runCapturingPrint(runner, <String>[
+        'sample',
+        '--packages=plugin1',
+        '--exclude=${configFile.path}'
+      ]);
+      expect(plugins, unorderedEquals(<String>[]));
+    });
+
     group('test run-on-changed-packages', () {
       test('all plugins should be tested if there are no changes.', () async {
         final Directory plugin1 = createFakePlugin('plugin1', packagesDir);