Move update_packages.dart to `flutter update-packages`

Now that we don't require the Dart SDK to be in your path, it's hard to run
./dev/update_packages.dart. Instead, you can now run `flutter update-packages`.

Fixes #1906

dev/update_packages.dart

-#!/usr/bin/env dart
-// Copyright 2015 The Chromium 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 'dart:io';
-
-final String binaryName = Platform.isWindows ? 'pub.bat' : 'pub';
-int runPub(Directory directory, List<String> pubArgs) {
-  int updateCount = 0;
-  for (FileSystemEntity dir in directory.listSync()) {
-    if (dir is Directory && FileSystemEntity.isFileSync(dir.path + Platform.pathSeparator + 'pubspec.yaml')) {
-      updateCount++;
-      Stopwatch timer = new Stopwatch()..start();
-      stdout.write("Updating ${dir.path}...");
-      ProcessResult result = Process.runSync(
-        binaryName,
-        pubArgs,
-        workingDirectory: dir.path
-      );
-      timer.stop();
-      stdout.write(" (${timer.elapsedMilliseconds} ms)");
-      if (result.exitCode != 0) {
-        print("... failed with exit code ${result.exitCode}.");
-        print(result.stdout);
-        print(result.stderr);
-      } else {
-        stdout.write("\n");
-      }
-    }
-  }
-  return updateCount;
-}
-
-void main(List<String> arguments) {
-  Stopwatch timer = new Stopwatch()..start();
-  bool upgrade = arguments.length > 0 && arguments[0] == '--upgrade';
-  String FLUTTER_ROOT = new File(Platform.script.toFilePath()).parent.parent.path;
-  List<String> pubArgs = [ upgrade ? 'upgrade' : 'get' ];
-  int count = 0;
-  count += runPub(new Directory("$FLUTTER_ROOT/packages"), pubArgs);
-  count += runPub(new Directory("$FLUTTER_ROOT/examples"), pubArgs);
-  String command = "$binaryName ${pubArgs.join(' ')}";
-  print("Ran \"$command\" $count times in ${timer.elapsedMilliseconds} ms");
-}

packages/flutter_tools/lib/executable.dart

@@ -28,6 +28,7 @@ import 'src/commands/run_mojo.dart';
 import 'src/commands/stop.dart';
 import 'src/commands/test.dart';
 import 'src/commands/trace.dart';
+import 'src/commands/update_packages.dart';
 import 'src/commands/upgrade.dart';
 import 'src/device.dart';
 import 'src/doctor.dart';
@@ -60,6 +61,7 @@ Future main(List<String> args) async {
     ..addCommand(new StopCommand())
     ..addCommand(new TestCommand())
     ..addCommand(new TraceCommand())
+    ..addCommand(new UpdatePackagesCommand(hideCommand: !verboseHelp))
     ..addCommand(new UpgradeCommand());
 
   return Chain.capture(() async {

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

+// Copyright 2015 The Chromium 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 'dart:async';
+import 'dart:io';
+
+import '../artifacts.dart';
+import '../dart/pub.dart';
+import '../globals.dart';
+import '../runner/flutter_command.dart';
+
+Future<int> _runPub(Directory directory, { bool upgrade: false }) async {
+  int updateCount = 0;
+  for (FileSystemEntity dir in directory.listSync()) {
+    if (dir is Directory && FileSystemEntity.isFileSync(dir.path + Platform.pathSeparator + 'pubspec.yaml')) {
+      updateCount++;
+      await pubGet(directory: dir.path, upgrade: upgrade, checkLastModified: false);
+    }
+  }
+  return updateCount;
+}
+
+class UpdatePackagesCommand extends FlutterCommand {
+  UpdatePackagesCommand({ hideCommand: false }) : _hideCommand = hideCommand {
+    argParser.addFlag(
+      'upgrade',
+      help: 'Run "pub upgrade" rather than "pub get".',
+      defaultsTo: false
+    );
+  }
+
+  final String name = 'update-packages';
+  final String description = 'Update the packages inside the Flutter repo.';
+
+  bool get hidden => _hideCommand;
+  final bool _hideCommand;
+
+  bool get requiresProjectRoot => false;
+
+  @override
+  Future<int> runInProject() async {
+    Stopwatch timer = new Stopwatch()..start();
+    int count = 0;
+    bool upgrade = argResults['upgrade'];
+    count += await _runPub(new Directory("${ArtifactStore.flutterRoot}/packages"), upgrade: upgrade);
+    count += await _runPub(new Directory("${ArtifactStore.flutterRoot}/examples"), upgrade: upgrade);
+    printStatus('Ran "pub" $count time${count == 1 ? "" : "s"} in ${timer.elapsedMilliseconds} ms');
+    return 0;
+  }
+}

packages/flutter_tools/lib/src/dart/pub.dart

@@ -12,7 +12,9 @@ import '../globals.dart';
 
 Future<int> pubGet({
   String directory,
-  bool skipIfAbsent: false
+  bool skipIfAbsent: false,
+  bool upgrade: false,
+  bool checkLastModified: true
 }) async {
   if (directory == null)
     directory = Directory.current.path;
@@ -28,10 +30,11 @@ Future<int> pubGet({
     return 1;
   }
 
-  if (!pubSpecLock.existsSync() || pubSpecYaml.lastModifiedSync().isAfter(pubSpecLock.lastModifiedSync())) {
+  if (!checkLastModified || !pubSpecLock.existsSync() || pubSpecYaml.lastModifiedSync().isAfter(pubSpecLock.lastModifiedSync())) {
     printStatus("Running 'pub get' in $directory${Platform.pathSeparator}...");
+    String command = upgrade ? 'upgrade' : 'get';
     int code = await runCommandAndStreamOutput(
-      <String>[sdkBinaryName('pub'), '--verbosity=warning', 'get'],
+      <String>[sdkBinaryName('pub'), '--verbosity=warning', command],
       workingDirectory: directory
     );
     if (code != 0)

travis/setup.sh

@@ -9,7 +9,7 @@ set -x
 
 # Download dependencies flutter
 ./bin/flutter --version
-./bin/cache/dart-sdk/bin/dart ./dev/update_packages.dart
+./bin/flutter update-packages
 
 if [ $TRAVIS_PULL_REQUEST = "false" ]; then
   export CLOUDSDK_CORE_DISABLE_PROMPTS=1