Enable developers to run pod from terminal directly and skip pod install if possible. (#13374)

Avoids running pod install if .flutter-plugins and its flutter framework pod dependency didn't change

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

@@ -24,7 +24,7 @@ class InjectPluginsCommand extends FlutterCommand {
 
   @override
   Future<Null> runCommand() async {
-    final bool result = injectPlugins();
+    final bool result = injectPlugins().hasPlugin;
     if (result) {
       printStatus('GeneratedPluginRegistrants successfully written.');
     } else {

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

@@ -57,15 +57,17 @@ class CocoaPods {
 
   Future<Null> processPods({
     @required Directory appIosDir,
-    @required String iosEngineDir,
     bool isSwift: false,
+    bool pluginOrFlutterPodChanged: true,
   }) async {
     if (await _checkPodCondition()) {
       if (!fs.file(fs.path.join(appIosDir.path, 'Podfile')).existsSync()) {
         await _createPodfile(appIosDir, isSwift);
       } // TODO(xster): Add more logic for handling merge conflicts.
-
+      if (_checkIfRunPodInstall(appIosDir.path, pluginOrFlutterPodChanged))
-      await _runPodInstall(appIosDir, iosEngineDir);
+        await _runPodInstall(appIosDir);
+    } else {
+      throwToolExit('CocoaPods not available for project using Flutter plugins');
     }
   }
 
@@ -108,13 +110,12 @@ class CocoaPods {
     podfileTemplate.copySync(fs.path.join(bundle.path, 'Podfile'));
   }
 
-  Future<Null> _runPodInstall(Directory bundle, String engineDirectory) async {
+  Future<Null> _runPodInstall(Directory bundle) async {
     final Status status = logger.startProgress('Running pod install...', expectSlowOperation: true);
     final ProcessResult result = await processManager.run(
       <String>['pod', 'install', '--verbose'],
       workingDirectory: bundle.path,
       environment: <String, String>{
-        'FLUTTER_FRAMEWORK_DIR': engineDirectory,
         // See https://github.com/flutter/flutter/issues/10873.
         // CocoaPods analytics adds a lot of latency.
         'COCOAPODS_DISABLE_STATS': 'true',
@@ -137,6 +138,28 @@ class CocoaPods {
     }
   }
 
+  // Check if you need to run pod install.
+  // The pod install will run if any of below is true.
+  // 1.Any plugins changed (add/update/delete)
+  // 2.The flutter.framework has changed (debug/release/profile)
+  // 3.The podfile.lock doesn't exists
+  // 4.The Pods/manifest.lock doesn't exists
+  // 5.The podfile.lock doesn't match Pods/manifest.lock.
+  bool _checkIfRunPodInstall(String appDir, bool pluginOrFlutterPodChanged) {
+    if (pluginOrFlutterPodChanged)
+      return true;
+    // Check if podfile.lock and Pods/Manifest.lock exists and matches.
+    final File podfileLockFile = fs.file(fs.path.join(appDir, 'Podfile.lock'));
+    final File manifestLockFile =
+        fs.file(fs.path.join(appDir, 'Pods', 'Manifest.lock'));
+    if (!podfileLockFile.existsSync() ||
+        !manifestLockFile.existsSync() ||
+        podfileLockFile.readAsStringSync() !=
+            manifestLockFile.readAsStringSync())
+      return true;
+    return false;
+  }
+
   void _diagnosePodInstallFailure(ProcessResult result) {
     if (result.stdout is String && result.stdout.contains('out-of-date source repos')) {
       printError(

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

@@ -254,14 +254,9 @@ Future<XcodeBuildResult> buildXcodeProject({
   // copied over to a location that is suitable for Xcodebuild to find them.
   final Directory appDirectory = fs.directory(app.appDirectory);
   await _addServicesToBundle(appDirectory);
-  final bool hasFlutterPlugins = injectPlugins();
+  final InjectPluginsResult injectionResult = injectPlugins();
-
+  final bool hasFlutterPlugins = injectionResult.hasPlugin;
-  if (hasFlutterPlugins)
+  final String priorGeneratedXCConfig = readGeneratedXCConfig(app.appDirectory);
-    await cocoaPods.processPods(
-      appIosDir: appDirectory,
-      iosEngineDir: flutterFrameworkDir(buildInfo.mode),
-      isSwift: app.isSwift,
-    );
 
   updateXcodeGeneratedProperties(
     projectPath: fs.currentDirectory.path,
@@ -271,6 +266,15 @@ Future<XcodeBuildResult> buildXcodeProject({
     previewDart2: buildInfo.previewDart2,
   );
 
+  if (hasFlutterPlugins) {
+    final String currentGeneratedXCConfig = readGeneratedXCConfig(app.appDirectory);
+    await cocoaPods.processPods(
+        appIosDir: appDirectory,
+        isSwift: app.isSwift,
+        pluginOrFlutterPodChanged: (injectionResult.hasChanged ||
+            priorGeneratedXCConfig != currentGeneratedXCConfig));
+  }
+
   final List<String> commands = <String>[
     '/usr/bin/env',
     'xcrun',
@@ -355,7 +359,17 @@ Future<XcodeBuildResult> buildXcodeProject({
   }
 }
 
-Future<Null> diagnoseXcodeBuildFailure(XcodeBuildResult result, BuildableIOSApp app) async {
+String readGeneratedXCConfig(String appPath) {
+  final String generateXCConfigPath =
+      fs.path.join(fs.currentDirectory.path, appPath, 'Flutter','Generated.xcconfig');
+  final File generateXCConfigFile = fs.file(generateXCConfigPath);
+  if (!generateXCConfigFile.existsSync())
+    return null;
+  return generateXCConfigFile.readAsStringSync();
+}
+
+Future<Null> diagnoseXcodeBuildFailure(
+    XcodeBuildResult result, BuildableIOSApp app) async {
   if (result.xcodeBuildExecution != null &&
       result.xcodeBuildExecution.buildForPhysicalDevice &&
       result.stdout?.contains('BCEROR') == true &&

packages/flutter_tools/lib/src/plugins.dart

@@ -77,8 +77,10 @@ List<Plugin> _findPlugins(String directory) {
   return plugins;
 }
 
-void _writeFlutterPluginsList(String directory, List<Plugin> plugins) {
+// Return true if .flutter-plugins has changed, otherwise return false.
+bool _writeFlutterPluginsList(String directory, List<Plugin> plugins) {
   final File pluginsProperties = fs.file(fs.path.join(directory, '.flutter-plugins'));
+  final String priorFlutterPlugins = (pluginsProperties.existsSync() ? pluginsProperties.readAsStringSync() : null);
   final String pluginManifest =
     plugins.map((Plugin p) => '${p.name}=${escapePath(p.path)}').join('\n');
   if (pluginManifest.isNotEmpty) {
@@ -88,6 +90,8 @@ void _writeFlutterPluginsList(String directory, List<Plugin> plugins) {
       pluginsProperties.deleteSync();
     }
   }
+  final String currentFlutterPlugins = (pluginsProperties.existsSync() ? pluginsProperties.readAsStringSync() : null);
+  return currentFlutterPlugins != priorFlutterPlugins;
 }
 
 const String _androidPluginRegistryTemplate = '''package io.flutter.plugins;
@@ -206,17 +210,25 @@ void _writeIOSPluginRegistry(String directory, List<Plugin> plugins) {
 
 }
 
+class InjectPluginsResult{
+  InjectPluginsResult({this.hasPlugin : false, this.hasChanged : false});
+  /// True if any flutter plugin exists, otherwise false.
+  final bool hasPlugin;
+  /// True if plugins have changed since last build.
+  final bool hasChanged;
+}
+
 /// Finds Flutter plugins in the pubspec.yaml, creates platform injection
 /// registries classes and add them to the build dependencies.
 ///
 /// Returns whether any Flutter plugins are added.
-bool injectPlugins({String directory}) {
+InjectPluginsResult injectPlugins({String directory}) {
   directory ??= fs.currentDirectory.path;
   final List<Plugin> plugins = _findPlugins(directory);
-  _writeFlutterPluginsList(directory, plugins);
+  final bool hasPluginsChanged = _writeFlutterPluginsList(directory, plugins);
   if (fs.isDirectorySync(fs.path.join(directory, 'android')))
     _writeAndroidPluginRegistry(directory, plugins);
   if (fs.isDirectorySync(fs.path.join(directory, 'ios')))
     _writeIOSPluginRegistry(directory, plugins);
-  return plugins.isNotEmpty;
+  return new InjectPluginsResult(hasPlugin: plugins.isNotEmpty, hasChanged: hasPluginsChanged);
 }

packages/flutter_tools/templates/cocoapods/Podfile-objc

@@ -1,30 +1,42 @@
 # Uncomment this line to define a global platform for your project
 # platform :ios, '9.0'
 
-if ENV['FLUTTER_FRAMEWORK_DIR'] == nil
+def parse_KV_file(file,seperator='=')
-  abort('Please set FLUTTER_FRAMEWORK_DIR to the directory containing Flutter.framework')
+  file_abs_path = File.expand_path(file)
+  if !File.exists? file_abs_path
+    puts "Generated.xcconfig or .flutter-plugins expected but not present. If you're running pod install manually, make sure flutter build or flutter run is executed once first."
+    return [];
   end
-
+  pods_ary = []
-target 'Runner' do
+  File.foreach(file_abs_path) { |line|
-  # Pods for Runner
+      plugin = line.split(pattern=seperator)
-
-  # Flutter Pods
-  pod 'Flutter', :path => ENV['FLUTTER_FRAMEWORK_DIR']
-
-  if File.exists? '../.flutter-plugins'
-    flutter_root = File.expand_path('..')
-    File.foreach('../.flutter-plugins') { |line|
-      plugin = line.split(pattern='=')
       if plugin.length == 2
-        name = plugin[0].strip()
+        podname = plugin[0].strip()
         path = plugin[1].strip()
-        resolved_path = File.expand_path("#{path}/ios", flutter_root)
+        podpath = File.expand_path("#{path}", file_abs_path)
-        pod name, :path => resolved_path
+        pods_ary.push({:name => podname,:path=>podpath});
       else
         puts "Invalid plugin specification: #{line}"
       end
   }
+  return pods_ary
 end
+
+target 'Runner' do
+  use_frameworks!
+  # Flutter Pods
+  generated_xcode_build_settings = parse_KV_file("./Flutter/Generated.xcconfig")
+    generated_xcode_build_settings.map{ |p|
+    if p[:name]=='FLUTTER_FRAMEWORK_DIR'
+      pod 'Flutter', :path => p[:path]
+    end
+  }
+
+  # Plugin Pods
+  plugin_pods = parse_KV_file("../.flutter-plugins")
+  plugin_pods.map{ |p|
+    pod p[:name], :path => File.expand_path("ios",p[:path])
+  }
 end
 
 post_install do |installer|

packages/flutter_tools/templates/cocoapods/Podfile-swift

@@ -1,32 +1,42 @@
 # Uncomment this line to define a global platform for your project
 # platform :ios, '9.0'
 
-if ENV['FLUTTER_FRAMEWORK_DIR'] == nil
+def parse_KV_file(file,seperator='=')
-  abort('Please set FLUTTER_FRAMEWORK_DIR to the directory containing Flutter.framework')
+  file_abs_path = File.expand_path(file)
+  if !File.exists? file_abs_path
+    puts "Generated.xcconfig or .flutter-plugins expected but not present. If you're running pod install manually, make sure flutter build or flutter run is executed once first."
+    return [];
   end
-
+  pods_ary = []
-target 'Runner' do
+  File.foreach(file_abs_path) { |line|
-  use_frameworks!
+      plugin = line.split(pattern=seperator)
-
-  # Pods for Runner
-
-  # Flutter Pods
-  pod 'Flutter', :path => ENV['FLUTTER_FRAMEWORK_DIR']
-
-  if File.exists? '../.flutter-plugins'
-    flutter_root = File.expand_path('..')
-    File.foreach('../.flutter-plugins') { |line|
-      plugin = line.split(pattern='=')
       if plugin.length == 2
-        name = plugin[0].strip()
+        podname = plugin[0].strip()
         path = plugin[1].strip()
-        resolved_path = File.expand_path("#{path}/ios", flutter_root)
+        podpath = File.expand_path("#{path}", file_abs_path)
-        pod name, :path => resolved_path
+        pods_ary.push({:name => podname,:path=>podpath});
       else
         puts "Invalid plugin specification: #{line}"
       end
   }
+  return pods_ary
 end
+
+target 'Runner' do
+  use_frameworks!
+  # Flutter Pods
+  generated_xcode_build_settings = parse_KV_file("./Flutter/Generated.xcconfig")
+    generated_xcode_build_settings.map{ |p|
+    if p[:name]=='FLUTTER_FRAMEWORK_DIR'
+      pod 'Flutter', :path => p[:path]
+    end
+  }
+
+  # Plugin Pods
+  plugin_pods = parse_KV_file("../.flutter-plugins")
+  plugin_pods.map{ |p|
+    pod p[:name], :path => File.expand_path("ios",p[:path])
+  }
 end
 
 post_install do |installer|

packages/flutter_tools/test/ios/cocoapods_test.dart

@@ -41,7 +41,7 @@ void main() {
     when(mockProcessManager.run(
       <String>['pod', 'install', '--verbose'],
       workingDirectory: 'project/ios',
-      environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+      environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
     )).thenReturn(exitsHappy);
   });
 
@@ -50,13 +50,12 @@ void main() {
     () async {
       await cocoaPodsUnderTest.processPods(
         appIosDir: projectUnderTest,
-        iosEngineDir: 'engine/path',
       );
       expect(fs.file(fs.path.join('project', 'ios', 'Podfile')).readAsStringSync() , 'Objective-C podfile template');
       verify(mockProcessManager.run(
         <String>['pod', 'install', '--verbose'],
         workingDirectory: 'project/ios',
-        environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
       ));
     },
     overrides: <Type, Generator>{
@@ -70,14 +69,13 @@ void main() {
     () async {
       await cocoaPodsUnderTest.processPods(
         appIosDir: projectUnderTest,
-        iosEngineDir: 'engine/path',
         isSwift: true,
       );
       expect(fs.file(fs.path.join('project', 'ios', 'Podfile')).readAsStringSync() , 'Swift podfile template');
       verify(mockProcessManager.run(
         <String>['pod', 'install', '--verbose'],
         workingDirectory: 'project/ios',
-        environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
       ));
     },
     overrides: <Type, Generator>{
@@ -94,12 +92,11 @@ void main() {
         ..writeAsString('Existing Podfile');
       await cocoaPodsUnderTest.processPods(
         appIosDir: projectUnderTest,
-        iosEngineDir: 'engine/path',
       );      expect(fs.file(fs.path.join('project', 'ios', 'Podfile')).readAsStringSync() , 'Existing Podfile');
       verify(mockProcessManager.run(
         <String>['pod', 'install', '--verbose'],
         workingDirectory: 'project/ios',
-        environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
       ));
     },
     overrides: <Type, Generator>{
@@ -115,14 +112,13 @@ void main() {
       try {
         await cocoaPodsUnderTest.processPods(
           appIosDir: projectUnderTest,
-          iosEngineDir: 'engine/path',
         );
         fail('Expected tool error');
       } catch (ToolExit) {
         verifyNever(mockProcessManager.run(
           <String>['pod', 'install', '--verbose'],
           workingDirectory: 'project/ios',
-          environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+          environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
         ));
       }
     },
@@ -142,7 +138,7 @@ void main() {
       when(mockProcessManager.run(
         <String>['pod', 'install', '--verbose'],
         workingDirectory: 'project/ios',
-        environment: <String, String>{'FLUTTER_FRAMEWORK_DIR': 'engine/path', 'COCOAPODS_DISABLE_STATS': 'true'},
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
       )).thenReturn(new ProcessResult(
         1,
         1,
@@ -165,7 +161,6 @@ Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by
       try {
         await cocoaPodsUnderTest.processPods(
           appIosDir: projectUnderTest,
-          iosEngineDir: 'engine/path',
         );      expect(fs.file(fs.path.join('project', 'ios', 'Podfile')).readAsStringSync() , 'Existing Podfile');
         fail('Exception expected');
       } catch (ToolExit) {
@@ -177,6 +172,62 @@ Note: as of CocoaPods 1.0, `pod repo update` does not happen on `pod install` by
       ProcessManager: () => mockProcessManager,
     },
   );
+
+  testUsingContext(
+    'Run pod install if plugins or flutter framework have changes.',
+        () async {
+      fs.file(fs.path.join('project', 'ios', 'Podfile'))
+        ..createSync()
+        ..writeAsString('Existing Podfile');
+      fs.file(fs.path.join('project', 'ios', 'Podfile.lock'))
+        ..createSync()
+        ..writeAsString('Existing lock files.');
+      fs.file(fs.path.join('project', 'ios', 'Pods','Manifest.lock'))
+        ..createSync(recursive: true)
+        ..writeAsString('Existing lock files.');
+      await cocoaPodsUnderTest.processPods(
+          appIosDir: projectUnderTest,
+          pluginOrFlutterPodChanged: true
+      );
+      verify(mockProcessManager.run(
+        <String>['pod', 'install', '--verbose'],
+        workingDirectory: 'project/ios',
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
+      ));
+    },
+    overrides: <Type, Generator>{
+      FileSystem: () => fs,
+      ProcessManager: () => mockProcessManager,
+    },
+  );
+
+  testUsingContext(
+    'Skip pod install if plugins and flutter framework remain unchanged.',
+        () async {
+      fs.file(fs.path.join('project', 'ios', 'Podfile'))
+        ..createSync()
+        ..writeAsString('Existing Podfile');
+      fs.file(fs.path.join('project', 'ios', 'Podfile.lock'))
+        ..createSync()
+        ..writeAsString('Existing lock files.');
+      fs.file(fs.path.join('project', 'ios', 'Pods','Manifest.lock'))
+        ..createSync(recursive: true)
+        ..writeAsString('Existing lock files.');
+      await cocoaPodsUnderTest.processPods(
+          appIosDir: projectUnderTest,
+          pluginOrFlutterPodChanged: false
+      );
+      verifyNever(mockProcessManager.run(
+        <String>['pod', 'install', '--verbose'],
+        workingDirectory: 'project/ios',
+        environment: <String, String>{'COCOAPODS_DISABLE_STATS': 'true'},
+      ));
+    },
+    overrides: <Type, Generator>{
+      FileSystem: () => fs,
+      ProcessManager: () => mockProcessManager,
+    },
+  );
 }
 
 class MockProcessManager extends Mock implements ProcessManager {}