Flutter tools recommend using Cocoapods 1.5.0 (#16971)

packages/flutter_tools/lib/src/context_runner.dart

@@ -52,7 +52,7 @@ Future<T> runInContext<T>(
       BotDetector: () => const BotDetector(),
       Cache: () => new Cache(),
       Clock: () => const Clock(),
-      CocoaPods: () => const CocoaPods(),
+      CocoaPods: () => new CocoaPods(),
       Config: () => new Config(),
       DevFSConfig: () => new DevFSConfig(),
       DeviceManager: () => new DeviceManager(),

packages/flutter_tools/lib/src/ios/cocoapods.dart

@@ -33,25 +33,46 @@ const String cocoaPodsUpgradeInstructions = '''
 
 CocoaPods get cocoaPods => context[CocoaPods];
 
-class CocoaPods {
-  const CocoaPods();
+/// Result of evaluating the CocoaPods installation.
+enum CocoaPodsStatus {
+  /// iOS plugins will not work, installation required.
+  notInstalled,
+  /// iOS plugins will not work, upgrade required.
+  belowMinimumVersion,
+  /// iOS plugins may not work in certain situations (Swift, static libraries),
+  /// upgrade recommended.
+  belowRecommendedVersion,
+  /// Everything should be fine.
+  recommended,
+}
 
-  Future<bool> get hasCocoaPods => exitsHappyAsync(<String>['pod', '--version']);
+class CocoaPods {
+  Future<String> _versionText;
 
-  // TODO(mravn): Insist on 1.5.0 once build bots have that installed.
-  // Earlier versions do not work with Swift and static libraries.
   String get cocoaPodsMinimumVersion => '1.0.0';
+  String get cocoaPodsRecommendedVersion => '1.5.0';
 
-  Future<String> get cocoaPodsVersionText async => (await runAsync(<String>['pod', '--version'])).processResult.stdout.trim();
+  Future<String> get cocoaPodsVersionText {
+    _versionText ??= runAsync(<String>['pod', '--version']).then<String>((RunResult result) {
+      return result.exitCode == 0 ? result.stdout.trim() : null;
+    });
+    return _versionText;
+  }
 
-  Future<bool> get isCocoaPodsInstalledAndMeetsVersionCheck async {
-    if (!await hasCocoaPods)
-      return false;
+  Future<CocoaPodsStatus> get evaluateCocoaPodsInstallation async {
+    final String versionText = await cocoaPodsVersionText;
+    if (versionText == null)
+      return CocoaPodsStatus.notInstalled;
     try {
-      final Version installedVersion = new Version.parse(await cocoaPodsVersionText);
-      return installedVersion >= new Version.parse(cocoaPodsMinimumVersion);
+      final Version installedVersion = new Version.parse(versionText);
+      if (installedVersion < new Version.parse(cocoaPodsMinimumVersion))
+        return CocoaPodsStatus.belowMinimumVersion;
+      else if (installedVersion < new Version.parse(cocoaPodsRecommendedVersion))
+        return CocoaPodsStatus.belowRecommendedVersion;
+      else
+        return CocoaPodsStatus.recommended;
     } on FormatException {
-      return false;
+      return CocoaPodsStatus.notInstalled;
     }
   }
 
@@ -77,16 +98,37 @@ class CocoaPods {
 
   /// Make sure the CocoaPods tools are in the right states.
   Future<bool> _checkPodCondition() async {
-    if (!await isCocoaPodsInstalledAndMeetsVersionCheck) {
-      final String minimumVersion = cocoaPodsMinimumVersion;
+    final CocoaPodsStatus installation = await evaluateCocoaPodsInstallation;
+    switch (installation) {
+      case CocoaPodsStatus.notInstalled:
         printError(
-        'Warning: CocoaPods version $minimumVersion or greater not installed. Skipping pod install.\n'
+          'Warning: CocoaPods not installed. Skipping pod install.\n'
           '$noCocoaPodsConsequence\n'
           'To install:\n'
           '$cocoaPodsInstallInstructions\n',
           emphasis: true,
         );
         return false;
+      case CocoaPodsStatus.belowMinimumVersion:
+        printError(
+          'Warning: CocoaPods minimum required version $cocoaPodsMinimumVersion or greater not installed. Skipping pod install.\n'
+          '$noCocoaPodsConsequence\n'
+          'To upgrade:\n'
+          '$cocoaPodsUpgradeInstructions\n',
+          emphasis: true,
+        );
+        return false;
+      case CocoaPodsStatus.belowRecommendedVersion:
+        printError(
+          'Warning: CocoaPods recommended version $cocoaPodsRecommendedVersion or greater not installed.\n'
+          'Pods handling may fail on some projects involving plugins.\n'
+          'To upgrade:\n'
+          '$cocoaPodsUpgradeInstructions\n',
+          emphasis: true,
+        );
+        break;
+      default:
+        break;
     }
     if (!await isCocoaPodsInitialized) {
       printError(
@@ -154,18 +196,19 @@ class CocoaPods {
   // Check if you need to run pod install.
   // The pod install will run if any of below is true.
   // 1. The flutter.framework has changed (debug/release/profile)
-  // 2. The podfile.lock doesn't exist
+  // 2. The Podfile.lock doesn't exist or is older than Podfile
   // 3. The Pods/Manifest.lock doesn't exist (It is deleted when plugins change)
-  // 4. The podfile.lock doesn't match Pods/Manifest.lock.
+  // 4. The Podfile.lock doesn't match Pods/Manifest.lock.
   bool _shouldRunPodInstall(Directory appIosDirectory, bool flutterPodChanged) {
     if (flutterPodChanged)
       return true;
-    // Check if podfile.lock and Pods/Manifest.lock exist and match.
+    final File podfileFile = appIosDirectory.childFile('Podfile');
     final File podfileLockFile = appIosDirectory.childFile('Podfile.lock');
     final File manifestLockFile =
         appIosDirectory.childFile(fs.path.join('Pods', 'Manifest.lock'));
     return !podfileLockFile.existsSync()
         || !manifestLockFile.existsSync()
+        || podfileLockFile.statSync().modified.isBefore(podfileFile.statSync().modified)
         || podfileLockFile.readAsStringSync() != manifestLockFile.readAsStringSync();
   }
 

packages/flutter_tools/lib/src/ios/ios_workflow.dart

@@ -171,7 +171,9 @@ class IOSWorkflow extends DoctorValidator implements Workflow {
         }
       }
 
-      if (await cocoaPods.isCocoaPodsInstalledAndMeetsVersionCheck) {
+      final CocoaPodsStatus cocoaPodsStatus = await cocoaPods.evaluateCocoaPodsInstallation;
+
+      if (cocoaPodsStatus == CocoaPodsStatus.recommended) {
         if (await cocoaPods.isCocoaPodsInitialized) {
           messages.add(new ValidationMessage('CocoaPods version ${await cocoaPods.cocoaPodsVersionText}'));
         } else {
@@ -186,7 +188,7 @@ class IOSWorkflow extends DoctorValidator implements Workflow {
         }
       } else {
         brewStatus = ValidationType.partial;
-        if (!await cocoaPods.hasCocoaPods) {
+        if (cocoaPodsStatus == CocoaPodsStatus.notInstalled) {
           messages.add(new ValidationMessage.error(
             'CocoaPods not installed.\n'
             '$noCocoaPodsConsequence\n'
@@ -195,7 +197,7 @@ class IOSWorkflow extends DoctorValidator implements Workflow {
           ));
         } else {
           messages.add(new ValidationMessage.error(
-            'CocoaPods out of date ($cocoaPods.cocoaPodsMinimumVersion is required).\n'
+            'CocoaPods out of date (${cocoaPods.cocoaPodsRecommendedVersion} is recommended).\n'
             '$noCocoaPodsConsequence\n'
             'To upgrade:\n'
             '$cocoaPodsUpgradeInstructions'

packages/flutter_tools/lib/src/plugins.dart

@@ -238,7 +238,7 @@ void injectPlugins({String directory}) {
     _writeAndroidPluginRegistrant(directory, plugins);
   if (fs.isDirectorySync(fs.path.join(directory, 'ios'))) {
     _writeIOSPluginRegistrant(directory, plugins);
-    const CocoaPods cocoaPods = const CocoaPods();
+    final CocoaPods cocoaPods = new CocoaPods();
     if (plugins.isNotEmpty)
       cocoaPods.setupPodfile(directory);
     if (changed)

packages/flutter_tools/test/ios/ios_workflow_test.dart

@@ -33,10 +33,10 @@ void main() {
       cocoaPods = new MockCocoaPods();
       fs = new MemoryFileSystem();
 
-      when(cocoaPods.isCocoaPodsInstalledAndMeetsVersionCheck)
-          .thenAnswer((_) => new Future<bool>.value(true));
-      when(cocoaPods.isCocoaPodsInitialized)
-          .thenAnswer((_) => new Future<bool>.value(true));
+      when(cocoaPods.evaluateCocoaPodsInstallation)
+          .thenAnswer((_) async => CocoaPodsStatus.recommended);
+      when(cocoaPods.isCocoaPodsInitialized).thenAnswer((_) async => true);
+      when(cocoaPods.cocoaPodsVersionText).thenAnswer((_) async => '1.8.0');
     });
 
     testUsingContext('Emit missing status when nothing is installed', () async {
@@ -213,9 +213,8 @@ void main() {
           .thenReturn('Xcode 8.2.1\nBuild version 8C1002\n');
       when(xcode.isInstalledAndMeetsVersionCheck).thenReturn(true);
       when(xcode.eulaSigned).thenReturn(true);
-      when(cocoaPods.isCocoaPodsInstalledAndMeetsVersionCheck)
-          .thenAnswer((_) => new Future<bool>.value(false));
-      when(cocoaPods.hasCocoaPods).thenAnswer((_) => new Future<bool>.value(false));
+      when(cocoaPods.evaluateCocoaPodsInstallation)
+          .thenAnswer((_) async => CocoaPodsStatus.notInstalled);
       when(xcode.isSimctlInstalled).thenReturn(true);
       final IOSWorkflowTestTarget workflow = new IOSWorkflowTestTarget();
       final ValidationResult result = await workflow.validate();
@@ -232,11 +231,8 @@ void main() {
           .thenReturn('Xcode 8.2.1\nBuild version 8C1002\n');
       when(xcode.isInstalledAndMeetsVersionCheck).thenReturn(true);
       when(xcode.eulaSigned).thenReturn(true);
-      when(cocoaPods.isCocoaPodsInstalledAndMeetsVersionCheck)
-          .thenAnswer((_) => new Future<bool>.value(false));
-      when(cocoaPods.hasCocoaPods).thenAnswer((_) => new Future<bool>.value(true));
-      when(cocoaPods.cocoaPodsVersionText)
-          .thenAnswer((_) => new Future<String>.value('0.39.0'));
+      when(cocoaPods.evaluateCocoaPodsInstallation)
+          .thenAnswer((_) async => CocoaPodsStatus.belowRecommendedVersion);
       when(xcode.isSimctlInstalled).thenReturn(true);
       final IOSWorkflowTestTarget workflow = new IOSWorkflowTestTarget();
       final ValidationResult result = await workflow.validate();
@@ -253,8 +249,6 @@ void main() {
           .thenReturn('Xcode 8.2.1\nBuild version 8C1002\n');
       when(xcode.isInstalledAndMeetsVersionCheck).thenReturn(true);
       when(xcode.eulaSigned).thenReturn(true);
-      when(cocoaPods.isCocoaPodsInstalledAndMeetsVersionCheck).thenAnswer((_) async => false);
-      when(cocoaPods.hasCocoaPods).thenAnswer((_) async => true);
       when(cocoaPods.isCocoaPodsInitialized).thenAnswer((_) async => false);
       when(xcode.isSimctlInstalled).thenReturn(true);