Start pulling pub from its own repo.

sdk/lib/_internal/pub/lib/src/global_packages.dart

Index: sdk/lib/_internal/pub/lib/src/global_packages.dart
diff --git a/sdk/lib/_internal/pub/lib/src/global_packages.dart b/sdk/lib/_internal/pub/lib/src/global_packages.dart
deleted file mode 100644
index 335cf8e241a79d5771711d6a0d04f54651093b30..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/global_packages.dart
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@@ -1,783 +0,0 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-library pub.global_packages;
-
-import 'dart:async';
-import 'dart:io';
-
-import 'package:path/path.dart' as p;
-import 'package:barback/barback.dart';
-import 'package:pub_semver/pub_semver.dart';
-
-import 'barback/asset_environment.dart';
-import 'entrypoint.dart';
-import 'exceptions.dart';
-import 'executable.dart' as exe;
-import 'io.dart';
-import 'lock_file.dart';
-import 'log.dart' as log;
-import 'package.dart';
-import 'pubspec.dart';
-import 'sdk.dart' as sdk;
-import 'solver/version_solver.dart';
-import 'source/cached.dart';
-import 'source/git.dart';
-import 'source/path.dart';
-import 'system_cache.dart';
-import 'utils.dart';
-
-/// Maintains the set of packages that have been globally activated.
-///
-/// These have been hand-chosen by the user to make their executables in bin/
-/// available to the entire system. This lets them access them even when the
-/// current working directory is not inside another entrypoint package.
-///
-/// Only one version of a given package name can be globally activated at a
-/// time. Activating a different version of a package will deactivate the
-/// previous one.
-///
-/// This handles packages from uncached and cached sources a little differently.
-/// For a cached source, the package is physically in the user's pub cache and
-/// we don't want to mess with it by putting a lockfile in there. Instead, when
-/// we activate the package, we create a full lockfile and put it in the
-/// "global_packages" directory. It's named "<package>.lock". Unlike a normal
-/// lockfile, it also contains an entry for the root package itself, so that we
-/// know the version and description that was activated.
-///
-/// Uncached packages (i.e. "path" packages) are somewhere else on the user's
-/// local file system and can have a lockfile directly in place. (And, in fact,
-/// we want to ensure we honor the user's lockfile there.) To activate it, we
-/// just need to know where that package directory is. For that, we create a
-/// lockfile that *only* contains the root package's [PackageId] -- basically
-/// just the path to the directory where the real lockfile lives.
-class GlobalPackages {
-  /// The [SystemCache] containing the global packages.
-  final SystemCache cache;
-
-  /// The directory where the lockfiles for activated packages are stored.
-  String get _directory => p.join(cache.rootDir, "global_packages");
-
-  /// The directory where binstubs for global package executables are stored.
-  String get _binStubDir => p.join(cache.rootDir, "bin");
-
-  /// Creates a new global package registry backed by the given directory on
-  /// the user's file system.
-  ///
-  /// The directory may not physically exist yet. If not, this will create it
-  /// when needed.
-  GlobalPackages(this.cache);
-
-  /// Caches the package located in the Git repository [repo] and makes it the
-  /// active global version.
-  ///
-  /// [executables] is the names of the executables that should have binstubs.
-  /// If `null`, all executables in the package will get binstubs. If empty, no
-  /// binstubs will be created.
-  ///
-  /// if [overwriteBinStubs] is `true`, any binstubs that collide with
-  /// existing binstubs in other packages will be overwritten by this one's.
-  /// Otherwise, the previous ones will be preserved.
-  Future activateGit(String repo, List<String> executables,
-      {bool overwriteBinStubs}) async {
-    var source = cache.sources["git"] as GitSource;
-    var name = await source.getPackageNameFromRepo(repo);
-    // Call this just to log what the current active package is, if any.
-    _describeActive(name);
-
-    // TODO(nweiz): Add some special handling for git repos that contain path
-    // dependencies. Their executables shouldn't be cached, and there should
-    // be a mechanism for redoing dependency resolution if a path pubspec has
-    // changed (see also issue 20499).
-    await _installInCache(
-        new PackageDep(name, "git", VersionConstraint.any, repo),
-        executables, overwriteBinStubs: overwriteBinStubs);
-  }
-
-  /// Finds the latest version of the hosted package with [name] that matches
-  /// [constraint] and makes it the active global version.
-  ///
-  /// [executables] is the names of the executables that should have binstubs.
-  /// If `null`, all executables in the package will get binstubs. If empty, no
-  /// binstubs will be created.
-  ///
-  /// if [overwriteBinStubs] is `true`, any binstubs that collide with
-  /// existing binstubs in other packages will be overwritten by this one's.
-  /// Otherwise, the previous ones will be preserved.
-  Future activateHosted(String name, VersionConstraint constraint,
-      List<String> executables, {bool overwriteBinStubs}) async {
-    _describeActive(name);
-    await _installInCache(new PackageDep(name, "hosted", constraint, name),
-        executables, overwriteBinStubs: overwriteBinStubs);
-  }
-
-  /// Makes the local package at [path] globally active.
-  ///
-  /// [executables] is the names of the executables that should have binstubs.
-  /// If `null`, all executables in the package will get binstubs. If empty, no
-  /// binstubs will be created.
-  ///
-  /// if [overwriteBinStubs] is `true`, any binstubs that collide with
-  /// existing binstubs in other packages will be overwritten by this one's.
-  /// Otherwise, the previous ones will be preserved.
-  Future activatePath(String path, List<String> executables,
-      {bool overwriteBinStubs}) async {
-    var entrypoint = new Entrypoint(path, cache);
-
-    // Get the package's dependencies.
-    await entrypoint.ensureLockFileIsUpToDate();
-    var name = entrypoint.root.name;
-
-    // Call this just to log what the current active package is, if any.
-    _describeActive(name);
-
-    // Write a lockfile that points to the local package.
-    var fullPath = canonicalize(entrypoint.root.dir);
-    var id = new PackageId(name, "path", entrypoint.root.version,
-        PathSource.describePath(fullPath));
-
-    // TODO(rnystrom): Look in "bin" and display list of binaries that
-    // user can run.
-    _writeLockFile(name, new LockFile([id]));
-
-    var binDir = p.join(_directory, name, 'bin');
-    if (dirExists(binDir)) deleteEntry(binDir);
-
-    _updateBinStubs(entrypoint.root, executables,
-        overwriteBinStubs: overwriteBinStubs);
-  }
-
-  /// Installs the package [dep] and its dependencies into the system cache.
-  Future _installInCache(PackageDep dep, List<String> executables,
-      {bool overwriteBinStubs}) async {
-    // Create a dummy package with just [dep] so we can do resolution on it.
-    var root = new Package.inMemory(new Pubspec("pub global activate",
-        dependencies: [dep], sources: cache.sources));
-
-    // Resolve it and download its dependencies.
-    var result = await resolveVersions(SolveType.GET, cache.sources, root);
-    if (!result.succeeded) {
-      // If the package specified by the user doesn't exist, we want to
-      // surface that as a [DataError] with the associated exit code.
-      if (result.error.package != dep.name) throw result.error;
-      if (result.error is NoVersionException) dataError(result.error.message);
-      throw result.error;
-    }
-    result.showReport(SolveType.GET);
-
-    // Make sure all of the dependencies are locally installed.
-    var ids = await Future.wait(result.packages.map(_cacheDependency));
-    var lockFile = new LockFile(ids);
-
-    // Load the package graph from [result] so we don't need to re-parse all
-    // the pubspecs.
-    var graph = await new Entrypoint.inMemory(root, lockFile, cache)
-        .loadPackageGraph(result);
-    var snapshots = await _precompileExecutables(graph.entrypoint, dep.name);
-    _writeLockFile(dep.name, lockFile);
-
-    _updateBinStubs(graph.packages[dep.name], executables,
-        overwriteBinStubs: overwriteBinStubs, snapshots: snapshots);
-  }
-
-  /// Precompiles the executables for [package] and saves them in the global
-  /// cache.
-  ///
-  /// Returns a map from executable name to path for the snapshots that were
-  /// successfully precompiled.
-  Future<Map<String, String>> _precompileExecutables(Entrypoint entrypoint,
-      String package) {
-    return log.progress("Precompiling executables", () async {
-      var binDir = p.join(_directory, package, 'bin');
-      cleanDir(binDir);
-
-      var graph = await entrypoint.loadPackageGraph();
-      var environment = await AssetEnvironment.create(
-          entrypoint, BarbackMode.RELEASE,
-          entrypoints: graph.packages[package].executableIds,
-          useDart2JS: false);
-      environment.barback.errors.listen((error) {
-        log.error(log.red("Build error:\n$error"));
-      });
-
-      return environment.precompileExecutables(package, binDir);
-    });
-  }
-
-  /// Downloads [id] into the system cache if it's a cached package.
-  ///
-  /// Returns the resolved [PackageId] for [id].
-  Future<PackageId> _cacheDependency(PackageId id) async {
-    var source = cache.sources[id.source];
-
-    if (!id.isRoot && source is CachedSource) {
-      await source.downloadToSystemCache(id);
-    }
-
-    return source.resolveId(id);
-  }
-
-  /// Finishes activating package [package] by saving [lockFile] in the cache.
-  void _writeLockFile(String package, LockFile lockFile) {
-    ensureDir(p.join(_directory, package));
-
-    // TODO(nweiz): This cleans up Dart 1.6's old lockfile location. Remove it
-    // when Dart 1.6 is old enough that we don't think anyone will have these
-    // lockfiles anymore (issue 20703).
-    var oldPath = p.join(_directory, "$package.lock");
-    if (fileExists(oldPath)) deleteEntry(oldPath);
-
-    writeTextFile(_getLockFilePath(package),
-        lockFile.serialize(cache.rootDir, cache.sources));
-
-    var id = lockFile.packages[package];
-    log.message('Activated ${_formatPackage(id)}.');
-  }
-
-  /// Shows the user the currently active package with [name], if any.
-  void _describeActive(String name) {
-    try {
-      var lockFile = new LockFile.load(_getLockFilePath(name), cache.sources);
-      var id = lockFile.packages[name];
-
-      if (id.source == 'git') {
-        var url = GitSource.urlFromDescription(id.description);
-        log.message('Package ${log.bold(name)} is currently active from Git '
-            'repository "${url}".');
-      } else if (id.source == 'path') {
-        var path = PathSource.pathFromDescription(id.description);
-        log.message('Package ${log.bold(name)} is currently active at path '
-            '"$path".');
-      } else {
-        log.message('Package ${log.bold(name)} is currently active at version '
-            '${log.bold(id.version)}.');
-      }
-    } on IOException {
-      // If we couldn't read the lock file, it's not activated.
-      return null;
-    }
-  }
-
-  /// Deactivates a previously-activated package named [name].
-  ///
-  /// Returns `false` if no package with [name] was currently active.
-  bool deactivate(String name) {
-    var dir = p.join(_directory, name);
-    if (!dirExists(dir)) return false;
-
-    _deleteBinStubs(name);
-
-    var lockFile = new LockFile.load(_getLockFilePath(name), cache.sources);
-    var id = lockFile.packages[name];
-    log.message('Deactivated package ${_formatPackage(id)}.');
-
-    deleteEntry(dir);
-
-    return true;
-  }
-
-  /// Finds the active package with [name].
-  ///
-  /// Returns an [Entrypoint] loaded with the active package if found.
-  Future<Entrypoint> find(String name) async {
-    var lockFilePath = _getLockFilePath(name);
-    var lockFile;
-    try {
-      lockFile = new LockFile.load(lockFilePath, cache.sources);
-    } on IOException {
-      var oldLockFilePath = p.join(_directory, '$name.lock');
-      try {
-        // TODO(nweiz): This looks for Dart 1.6's old lockfile location.
-        // Remove it when Dart 1.6 is old enough that we don't think anyone
-        // will have these lockfiles anymore (issue 20703).
-        lockFile = new LockFile.load(oldLockFilePath, cache.sources);
-      } on IOException {
-        // If we couldn't read the lock file, it's not activated.
-        dataError("No active package ${log.bold(name)}.");
-      }
-
-      // Move the old lockfile to its new location.
-      ensureDir(p.dirname(lockFilePath));
-      new File(oldLockFilePath).renameSync(lockFilePath);
-    }
-
-    // Load the package from the cache.
-    var id = lockFile.packages[name];
-    lockFile.packages.remove(name);
-
-    var source = cache.sources[id.source];
-    if (source is CachedSource) {
-      // For cached sources, the package itself is in the cache and the
-      // lockfile is the one we just loaded.
-      var dir = await cache.sources[id.source].getDirectory(id);
-      var package = new Package.load(name, dir, cache.sources);
-      return new Entrypoint.inMemory(package, lockFile, cache);
-    }
-
-    // For uncached sources (i.e. path), the ID just points to the real
-    // directory for the package.
-    assert(id.source == "path");
-    return new Entrypoint(PathSource.pathFromDescription(id.description),
-        cache);
-  }
-
-  /// Runs [package]'s [executable] with [args].
-  ///
-  /// If [executable] is available in its precompiled form, that will be
-  /// recompiled if the SDK has been upgraded since it was first compiled and
-  /// then run. Otherwise, it will be run from source.
-  ///
-  /// If [mode] is passed, it's used as the barback mode; it defaults to
-  /// [BarbackMode.RELEASE].
-  ///
-  /// Returns the exit code from the executable.
-  Future<int> runExecutable(String package, String executable,
-      Iterable<String> args, {BarbackMode mode}) {
-    if (mode == null) mode = BarbackMode.RELEASE;
-
-    var binDir = p.join(_directory, package, 'bin');
-    if (mode != BarbackMode.RELEASE ||
-        !fileExists(p.join(binDir, '$executable.dart.snapshot'))) {
-      return find(package).then((entrypoint) {
-        return exe.runExecutable(entrypoint, package, executable, args,
-            mode: mode, isGlobal: true);
-      });
-    }
-
-    // Unless the user overrides the verbosity, we want to filter out the
-    // normal pub output shown while loading the environment.
-    if (log.verbosity == log.Verbosity.NORMAL) {
-      log.verbosity = log.Verbosity.WARNING;
-    }
-
-    var snapshotPath = p.join(binDir, '$executable.dart.snapshot');
-    return exe.runSnapshot(snapshotPath, args, recompile: () {
-      log.fine("$package:$executable is out of date and needs to be "
-          "recompiled.");
-      return find(package)
-          .then((entrypoint) => entrypoint.loadPackageGraph())
-          .then((graph) => _precompileExecutables(graph.entrypoint, package));
-    });
-  }
-
-  /// Gets the path to the lock file for an activated cached package with
-  /// [name].
-  String _getLockFilePath(String name) =>
-      p.join(_directory, name, "pubspec.lock");
-
-  /// Shows the user a formatted list of globally activated packages.
-  void listActivePackages() {
-    if (!dirExists(_directory)) return;
-
-    listDir(_directory).map(_loadPackageId).toList()
-        ..sort((id1, id2) => id1.name.compareTo(id2.name))
-        ..forEach((id) => log.message(_formatPackage(id)));
-  }
-
-  /// Returns the [PackageId] for the globally-activated package at [path].
-  ///
-  /// [path] should be a path within [_directory]. It can either be an old-style
-  /// path to a single lockfile or a new-style path to a directory containing a
-  /// lockfile.
-  PackageId _loadPackageId(String path) {
-    var name = p.basenameWithoutExtension(path);
-    if (!fileExists(path)) path = p.join(path, 'pubspec.lock');
-
-    var id = new LockFile.load(p.join(_directory, path), cache.sources)
-        .packages[name];
-
-    if (id == null) {
-      throw new FormatException("Pubspec for activated package $name didn't "
-          "contain an entry for itself.");
-    }
-
-    return id;
-  }
-
-  /// Returns formatted string representing the package [id].
-  String _formatPackage(PackageId id) {
-    if (id.source == 'git') {
-      var url = GitSource.urlFromDescription(id.description);
-      return '${log.bold(id.name)} ${id.version} from Git repository "$url"';
-    } else if (id.source == 'path') {
-      var path = PathSource.pathFromDescription(id.description);
-      return '${log.bold(id.name)} ${id.version} at path "$path"';
-    } else {
-      return '${log.bold(id.name)} ${id.version}';
-    }
-  }
-
-  /// Repairs any corrupted globally-activated packages and their binstubs.
-  ///
-  /// Returns a pair of two [int]s. The first indicates how many packages were
-  /// successfully re-activated; the second indicates how many failed.
-  Future<Pair<int, int>> repairActivatedPackages() async {
-    var executables = {};
-    if (dirExists(_binStubDir)) {
-      for (var entry in listDir(_binStubDir)) {
-        try {
-          var binstub = readTextFile(entry);
-          var package = _binStubProperty(binstub, "Package");
-          if (package == null) {
-            throw new ApplicationException("No 'Package' property.");
-          }
-
-          var executable = _binStubProperty(binstub, "Executable");
-          if (executable == null) {
-            throw new ApplicationException("No 'Executable' property.");
-          }
-
-          executables.putIfAbsent(package, () => []).add(executable);
-        } catch (error, stackTrace) {
-          log.error(
-              "Error reading binstub for "
-                  "\"${p.basenameWithoutExtension(entry)}\"",
-              error, stackTrace);
-
-          tryDeleteEntry(entry);
-        }
-      }
-    }
-
-    var successes = 0;
-    var failures = 0;
-    if (dirExists(_directory)) {
-      for (var entry in listDir(_directory)) {
-        var id;
-        try {
-          id = _loadPackageId(entry);
-          log.message("Reactivating ${log.bold(id.name)} ${id.version}...");
-
-          var entrypoint = await find(id.name);
-
-          var graph = await entrypoint.loadPackageGraph();
-          var snapshots = await _precompileExecutables(entrypoint, id.name);
-          var packageExecutables = executables.remove(id.name);
-          if (packageExecutables == null) packageExecutables = [];
-          _updateBinStubs(graph.packages[id.name], packageExecutables,
-              overwriteBinStubs: true, snapshots: snapshots,
-              suggestIfNotOnPath: false);
-          successes++;
-        } catch (error, stackTrace) {
-          var message = "Failed to reactivate "
-              "${log.bold(p.basenameWithoutExtension(entry))}";
-          if (id != null) {
-            message += " ${id.version}";
-            if (id.source != "hosted") message += " from ${id.source}";
-          }
-
-          log.error(message, error, stackTrace);
-          failures++;
-
-          tryDeleteEntry(entry);
-        }
-      }
-    }
-
-    if (executables.isNotEmpty) {
-      var message = new StringBuffer("Binstubs exist for non-activated "
-          "packages:\n");
-      executables.forEach((package, executableNames) {
-        // TODO(nweiz): Use a normal for loop here when
-        // https://github.com/dart-lang/async_await/issues/68 is fixed.
-        executableNames.forEach((executable) =>
-            deleteEntry(p.join(_binStubDir, executable)));
-
-        message.writeln("  From ${log.bold(package)}: "
-            "${toSentence(executableNames)}");
-      });
-      log.error(message);
-    }
-
-    return new Pair(successes, failures);
-  }
-
-  /// Updates the binstubs for [package].
-  ///
-  /// A binstub is a little shell script in `PUB_CACHE/bin` that runs an
-  /// executable from a globally activated package. This removes any old
-  /// binstubs from the previously activated version of the package and
-  /// (optionally) creates new ones for the executables listed in the package's
-  /// pubspec.
-  ///
-  /// [executables] is the names of the executables that should have binstubs.
-  /// If `null`, all executables in the package will get binstubs. If empty, no
-  /// binstubs will be created.
-  ///
-  /// If [overwriteBinStubs] is `true`, any binstubs that collide with
-  /// existing binstubs in other packages will be overwritten by this one's.
-  /// Otherwise, the previous ones will be preserved.
-  ///
-  /// If [snapshots] is given, it is a map of the names of executables whose
-  /// snapshots were precompiled to the paths of those snapshots. Binstubs for
-  /// those will run the snapshot directly and skip pub entirely.
-  ///
-  /// If [suggestIfNotOnPath] is `true` (the default), this will warn the user if
-  /// the bin directory isn't on their path.
-  void _updateBinStubs(Package package, List<String> executables,
-      {bool overwriteBinStubs, Map<String, String> snapshots,
-       bool suggestIfNotOnPath: true}) {
-    if (snapshots == null) snapshots = const {};
-
-    // Remove any previously activated binstubs for this package, in case the
-    // list of executables has changed.
-    _deleteBinStubs(package.name);
-
-    if ((executables != null && executables.isEmpty) ||
-        package.pubspec.executables.isEmpty) {
-      return;
-    }
-
-    ensureDir(_binStubDir);
-
-    var installed = [];
-    var collided = {};
-    var allExecutables = ordered(package.pubspec.executables.keys);
-    for (var executable in allExecutables) {
-      if (executables != null && !executables.contains(executable)) continue;
-
-      var script = package.pubspec.executables[executable];
-
-      var previousPackage = _createBinStub(package, executable, script,
-          overwrite: overwriteBinStubs, snapshot: snapshots[script]);
-      if (previousPackage != null) {
-        collided[executable] = previousPackage;
-
-        if (!overwriteBinStubs) continue;
-      }
-
-      installed.add(executable);
-    }
-
-    if (installed.isNotEmpty) {
-      var names = namedSequence("executable", installed.map(log.bold));
-      log.message("Installed $names.");
-    }
-
-    // Show errors for any collisions.
-    if (collided.isNotEmpty) {
-      for (var command in ordered(collided.keys)) {
-        if (overwriteBinStubs) {
-          log.warning("Replaced ${log.bold(command)} previously installed from "
-              "${log.bold(collided[command])}.");
-        } else {
-          log.warning("Executable ${log.bold(command)} was already installed "
-              "from ${log.bold(collided[command])}.");
-        }
-      }
-
-      if (!overwriteBinStubs) {
-        log.warning("Deactivate the other package(s) or activate "
-            "${log.bold(package.name)} using --overwrite.");
-      }
-    }
-
-    // Show errors for any unknown executables.
-    if (executables != null) {
-      var unknown = ordered(executables.where(
-          (exe) => !package.pubspec.executables.keys.contains(exe)));
-      if (unknown.isNotEmpty) {
-        dataError("Unknown ${namedSequence('executable', unknown)}.");
-      }
-    }
-
-    // Show errors for any missing scripts.
-    // TODO(rnystrom): This can print false positives since a script may be
-    // produced by a transformer. Do something better.
-    var binFiles = package.listFiles(beneath: "bin", recursive: false)
-        .map((path) => package.relative(path))
-        .toList();
-    for (var executable in installed) {
-      var script = package.pubspec.executables[executable];
-      var scriptPath = p.join("bin", "$script.dart");
-      if (!binFiles.contains(scriptPath)) {
-        log.warning('Warning: Executable "$executable" runs "$scriptPath", '
-            'which was not found in ${log.bold(package.name)}.');
-      }
-    }
-
-    if (suggestIfNotOnPath && installed.isNotEmpty) {
-      _suggestIfNotOnPath(installed.first);
-    }
-  }
-
-  /// Creates a binstub named [executable] that runs [script] from [package].
-  ///
-  /// If [overwrite] is `true`, this will replace an existing binstub with that
-  /// name for another package.
-  ///
-  /// If [snapshot] is non-null, it is a path to a snapshot file. The binstub
-  /// will invoke that directly. Otherwise, it will run `pub global run`.
-  ///
-  /// If a collision occurs, returns the name of the package that owns the
-  /// existing binstub. Otherwise returns `null`.
-  String _createBinStub(Package package, String executable, String script,
-      {bool overwrite, String snapshot}) {
-    var binStubPath = p.join(_binStubDir, executable);
-
-    if (Platform.operatingSystem == "windows") binStubPath += ".bat";
-
-    // See if the binstub already exists. If so, it's for another package
-    // since we already deleted all of this package's binstubs.
-    var previousPackage;
-    if (fileExists(binStubPath)) {
-      var contents = readTextFile(binStubPath);
-      previousPackage = _binStubProperty(contents, "Package");
-      if (previousPackage == null) {
-        log.fine("Could not parse binstub $binStubPath:\n$contents");
-      } else if (!overwrite) {
-        return previousPackage;
-      }
-    }
-
-    // If the script was precompiled to a snapshot, just invoke that directly
-    // and skip pub global run entirely.
-    var invocation;
-    if (snapshot != null) {
-      // We expect absolute paths from the precompiler since relative ones
-      // won't be relative to the right directory when the user runs this.
-      assert(p.isAbsolute(snapshot));
-      invocation = 'dart "$snapshot"';
-    } else {
-      invocation = "pub global run ${package.name}:$script";
-    }
-
-    if (Platform.operatingSystem == "windows") {
-      var batch = """
-@echo off
-rem This file was created by pub v${sdk.version}.
-rem Package: ${package.name}
-rem Version: ${package.version}
-rem Executable: ${executable}
-rem Script: ${script}
-$invocation %*
-""";
-
-      if (snapshot != null) {
-        batch += """
-
-rem The VM exits with code 253 if the snapshot version is out-of-date.
-rem If it is, we need to delete it and run "pub global" manually.
-if not errorlevel 253 (
-  exit /b %errorlevel%
-)
-
-pub global run ${package.name}:$script %*
-""";
-      }
-
-      writeTextFile(binStubPath, batch);
-    } else {
-      var bash = """
-#!/usr/bin/env sh
-# This file was created by pub v${sdk.version}.
-# Package: ${package.name}
-# Version: ${package.version}
-# Executable: ${executable}
-# Script: ${script}
-$invocation "\$@"
-""";
-
-      if (snapshot != null) {
-        bash += """
-
-# The VM exits with code 253 if the snapshot version is out-of-date.
-# If it is, we need to delete it and run "pub global" manually.
-exit_code=\$?
-if [ \$exit_code != 253 ]; then
-  exit \$exit_code
-fi
-
-pub global run ${package.name}:$script "\$@"
-""";
-      }
-
-      writeTextFile(binStubPath, bash);
-
-      // Make it executable.
-      var result = Process.runSync('chmod', ['+x', binStubPath]);
-      if (result.exitCode != 0) {
-        // Couldn't make it executable so don't leave it laying around.
-        try {
-          deleteEntry(binStubPath);
-        } on IOException catch (err) {
-          // Do nothing. We're going to fail below anyway.
-          log.fine("Could not delete binstub:\n$err");
-        }
-
-        fail('Could not make "$binStubPath" executable (exit code '
-            '${result.exitCode}):\n${result.stderr}');
-      }
-    }
-
-    return previousPackage;
-  }
-
-  /// Deletes all existing binstubs for [package].
-  void _deleteBinStubs(String package) {
-    if (!dirExists(_binStubDir)) return;
-
-    for (var file in listDir(_binStubDir, includeDirs: false)) {
-      var contents = readTextFile(file);
-      var binStubPackage = _binStubProperty(contents, "Package");
-      if (binStubPackage == null) {
-        log.fine("Could not parse binstub $file:\n$contents");
-        continue;
-      }
-
-      if (binStubPackage == package) {
-        log.fine("Deleting old binstub $file");
-        deleteEntry(file);
-      }
-    }
-  }
-
-  /// Checks to see if the binstubs are on the user's PATH and, if not, suggests
-  /// that the user add the directory to their PATH.
-  ///
-  /// [installed] should be the name of an installed executable that can be used
-  /// to test whether accessing it on the path works.
-  void _suggestIfNotOnPath(String installed) {
-    if (Platform.operatingSystem == "windows") {
-      // See if the shell can find one of the binstubs.
-      // "\q" means return exit code 0 if found or 1 if not.
-      var result = runProcessSync("where", [r"\q", installed + ".bat"]);
-      if (result.exitCode == 0) return;
-
-      log.warning(
-          "${log.yellow('Warning:')} Pub installs executables into "
-              "${log.bold(_binStubDir)}, which is not on your path.\n"
-          "You can fix that by adding that directory to your system's "
-              '"Path" environment variable.\n'
-          'A web search for "configure windows path" will show you how.');
-    } else {
-      // See if the shell can find one of the binstubs.
-      var result = runProcessSync("which", [installed]);
-      if (result.exitCode == 0) return;
-
-      var binDir = _binStubDir;
-      if (binDir.startsWith(Platform.environment['HOME'])) {
-        binDir = p.join("~", p.relative(binDir,
-            from: Platform.environment['HOME']));
-      }
-
-      log.warning(
-          "${log.yellow('Warning:')} Pub installs executables into "
-              "${log.bold(binDir)}, which is not on your path.\n"
-          "You can fix that by adding this to your shell's config file "
-              "(.bashrc, .bash_profile, etc.):\n"
-          "\n"
-          "  ${log.bold('export PATH="\$PATH":"$binDir"')}\n"
-          "\n");
-    }
-  }
-
-  /// Returns the value of the property named [name] in the bin stub script
-  /// [source].
-  String _binStubProperty(String source, String name) {
-    var pattern = new RegExp(quoteRegExp(name) + r": ([a-zA-Z0-9_-]+)");
-    var match = pattern.firstMatch(source);
-    return match == null ? null : match[1];
-  }
-}