Correctly propagate verbosity to subtasks in flutter.gradle (#117897)

* Correctly propagate verbosity to subtasks in flutter.gradle

* Add test

* Revert accidental changes

* Fix copyright year

* Fix imports

packages/flutter_tools/gradle/flutter.gradle

@@ -618,10 +618,7 @@ class FlutterPlugin implements Plugin<Project> {
     }
 
     private Boolean shouldSplitPerAbi() {
-        if (project.hasProperty('split-per-abi')) {
-            return project.property('split-per-abi').toBoolean()
-        }
-        return false;
+        return project.findProperty('split-per-abi')?.toBoolean() ?: false;
     }
 
     private Boolean useLocalEngine() {
@@ -629,18 +626,12 @@ class FlutterPlugin implements Plugin<Project> {
     }
 
     private Boolean isVerbose() {
-        if (project.hasProperty('verbose')) {
-            return project.property('verbose').toBoolean()
-        }
-        return false
+        return project.findProperty('verbose')?.toBoolean() ?: false;
     }
 
     /** Whether to build the debug app in "fast-start" mode. */
     private Boolean isFastStart() {
-        if (project.hasProperty("fast-start")) {
-            return project.property("fast-start").toBoolean()
-        }
-        return false
+        return project.findProperty("fast-start")?.toBoolean() ?: false;
     }
 
     private static Boolean isBuiltAsApp(Project project) {
@@ -877,6 +868,12 @@ class FlutterPlugin implements Plugin<Project> {
             }
             String variantBuildMode = buildModeFor(variant.buildType)
             String taskName = toCamelCase(["compile", FLUTTER_BUILD_PREFIX, variant.name])
+            // Be careful when configuring task below, Groovy has bizarre
+            // scoping rules: writing `verbose isVerbose()` means calling
+            // `isVerbose` on the task itself - which would return `verbose`
+            // original value. You either need to hoist the value
+            // into a separate variable `verbose verboseValue` or prefix with
+            // `this` (`verbose this.isVerbose()`).
             FlutterTask compileTask = project.tasks.create(name: taskName, type: FlutterTask) {
                 flutterRoot this.flutterRoot
                 flutterExecutable this.flutterExecutable
@@ -884,8 +881,8 @@ class FlutterPlugin implements Plugin<Project> {
                 localEngine this.localEngine
                 localEngineSrcPath this.localEngineSrcPath
                 targetPath getFlutterTarget()
-                verbose isVerbose()
-                fastStart isFastStart()
+                verbose this.isVerbose()
+                fastStart this.isFastStart()
                 fileSystemRoots fileSystemRootsValue
                 fileSystemScheme fileSystemSchemeValue
                 trackWidgetCreation trackWidgetCreationValue
@@ -1089,7 +1086,7 @@ abstract class BaseFlutterTask extends DefaultTask {
     Boolean fastStart
     @Input
     String targetPath
-    @Optional @Internal
+    @Optional @Input
     Boolean verbose
     @Optional @Input
     String[] fileSystemRoots

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

@@ -0,0 +1,55 @@
+// 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:flutter_tools/src/base/file_system.dart';
+import 'package:flutter_tools/src/base/io.dart';
+
+import '../src/common.dart';
+import 'test_utils.dart';
+
+// Test that verbosity it propagated to Gradle tasks correctly.
+void main() {
+  late Directory tempDir;
+  late String flutterBin;
+  late Directory exampleAppDir;
+
+  setUp(() async {
+    tempDir = createResolvedTempDirectorySync('flutter_build_test.');
+    flutterBin = fileSystem.path.join(
+      getFlutterRoot(),
+      'bin',
+      'flutter',
+    );
+    exampleAppDir = tempDir.childDirectory('aaa').childDirectory('example');
+
+    processManager.runSync(<String>[
+      flutterBin,
+      ...getLocalEngineArguments(),
+      'create',
+      '--template=plugin',
+      '--platforms=android',
+      'aaa',
+    ], workingDirectory: tempDir.path);
+  });
+
+  tearDown(() async {
+    tryToDelete(tempDir);
+  });
+
+  test(
+    'flutter build apk -v output should contain gen_snapshot command',
+    () async {
+      final ProcessResult result = processManager.runSync(<String>[
+        flutterBin,
+        ...getLocalEngineArguments(),
+        'build',
+        'apk',
+        '--target-platform=android-arm',
+        '-v',
+      ], workingDirectory: exampleAppDir.path);
+      expect(
+          result.stdout, contains(RegExp(r'executing:\s+\S+gen_snapshot\s+')));
+    },
+  );
+}