Start pulling pub from its own repo.

sdk/lib/_internal/pub/lib/src/source/git.dart

Index: sdk/lib/_internal/pub/lib/src/source/git.dart
diff --git a/sdk/lib/_internal/pub/lib/src/source/git.dart b/sdk/lib/_internal/pub/lib/src/source/git.dart
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index dc4c8b3e8a413a209474dc8b1b1431f851735885..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub/lib/src/source/git.dart
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-// Copyright (c) 2012, 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.source.git;
-
-import 'dart:async';
-
-import 'package:path/path.dart' as path;
-
-import '../git.dart' as git;
-import '../io.dart';
-import '../log.dart' as log;
-import '../package.dart';
-import '../pubspec.dart';
-import '../utils.dart';
-import 'cached.dart';
-
-/// A package source that gets packages from Git repos.
-class GitSource extends CachedSource {
-  /// Given a valid git package description, returns the URL of the repository
-  /// it pulls from.
-  static String urlFromDescription(description) => description["url"];
-
-  final name = "git";
-
-  /// The paths to the canonical clones of repositories for which "git fetch"
-  /// has already been run during this run of pub.
-  final _updatedRepos = new Set<String>();
-
-  /// Given a Git repo that contains a pub package, gets the name of the pub
-  /// package.
-  Future<String> getPackageNameFromRepo(String repo) {
-    // Clone the repo to a temp directory.
-    return withTempDir((tempDir) {
-      return _clone(repo, tempDir, shallow: true).then((_) {
-        var pubspec = new Pubspec.load(tempDir, systemCache.sources);
-        return pubspec.name;
-      });
-    });
-  }
-
-  /// Since we don't have an easy way to read from a remote Git repo, this
-  /// just installs [id] into the system cache, then describes it from there.
-  Future<Pubspec> describeUncached(PackageId id) {
-    return downloadToSystemCache(id).then((package) => package.pubspec);
-  }
-
-  /// Clones a Git repo to the local filesystem.
-  ///
-  /// The Git cache directory is a little idiosyncratic. At the top level, it
-  /// contains a directory for each commit of each repository, named `<package
-  /// name>-<commit hash>`. These are the canonical package directories that are
-  /// linked to from the `packages/` directory.
-  ///
-  /// In addition, the Git system cache contains a subdirectory named `cache/`
-  /// which contains a directory for each separate repository URL, named
-  /// `<package name>-<url hash>`. These are used to check out the repository
-  /// itself; each of the commit-specific directories are clones of a directory
-  /// in `cache/`.
-  Future<Package> downloadToSystemCache(PackageId id) {
-    var revisionCachePath;
-
-    if (!git.isInstalled) {
-      fail("Cannot get ${id.name} from Git (${_getUrl(id)}).\n"
-          "Please ensure Git is correctly installed.");
-    }
-
-    ensureDir(path.join(systemCacheRoot, 'cache'));
-    return _ensureRevision(id).then((_) => getDirectory(id)).then((path) {
-      revisionCachePath = path;
-      if (entryExists(revisionCachePath)) return null;
-      return _clone(_repoCachePath(id), revisionCachePath, mirror: false);
-    }).then((_) {
-      var ref = _getEffectiveRef(id);
-      if (ref == 'HEAD') return null;
-      return _checkOut(revisionCachePath, ref);
-    }).then((_) {
-      return new Package.load(id.name, revisionCachePath, systemCache.sources);
-    });
-  }
-
-  /// Returns the path to the revision-specific cache of [id].
-  Future<String> getDirectory(PackageId id) {
-    return _ensureRevision(id).then((rev) {
-      var revisionCacheName = '${id.name}-$rev';
-      return path.join(systemCacheRoot, revisionCacheName);
-    });
-  }
-
-  /// Ensures [description] is a Git URL.
-  dynamic parseDescription(String containingPath, description,
-                           {bool fromLockFile: false}) {
-    // TODO(rnystrom): Handle git URLs that are relative file paths (#8570).
-    // TODO(rnystrom): Now that this function can modify the description, it
-    // may as well canonicalize it to a map so that other code in the source
-    // can assume that.
-    // A single string is assumed to be a Git URL.
-    if (description is String) return description;
-    if (description is! Map || !description.containsKey('url')) {
-      throw new FormatException("The description must be a Git URL or a map "
-          "with a 'url' key.");
-    }
-
-    var parsed = new Map.from(description);
-    parsed.remove('url');
-    parsed.remove('ref');
-    if (fromLockFile) parsed.remove('resolved-ref');
-
-    if (!parsed.isEmpty) {
-      var plural = parsed.length > 1;
-      var keys = parsed.keys.join(', ');
-      throw new FormatException("Invalid key${plural ? 's' : ''}: $keys.");
-    }
-
-    return description;
-  }
-
-  /// If [description] has a resolved ref, print it out in short-form.
-  ///
-  /// This helps distinguish different git commits with the same pubspec
-  /// version.
-  String formatDescription(String containingPath, description) {
-    if (description is Map && description.containsKey('resolved-ref')) {
-      return "${description['url']} at "
-          "${description['resolved-ref'].substring(0, 6)}";
-    } else {
-      return super.formatDescription(containingPath, description);
-    }
-  }
-
-  /// Two Git descriptions are equal if both their URLs and their refs are
-  /// equal.
-  bool descriptionsEqual(description1, description2) {
-    // TODO(nweiz): Do we really want to throw an error if you have two
-    // dependencies on some repo, one of which specifies a ref and one of which
-    // doesn't? If not, how do we handle that case in the version solver?
-    if (_getUrl(description1) != _getUrl(description2)) return false;
-    if (_getRef(description1) != _getRef(description2)) return false;
-
-    if (description1 is Map && description1.containsKey('resolved-ref') &&
-        description2 is Map && description2.containsKey('resolved-ref')) {
-      return description1['resolved-ref'] == description2['resolved-ref'];
-    }
-
-    return true;
-  }
-
-  /// Attaches a specific commit to [id] to disambiguate it.
-  Future<PackageId> resolveId(PackageId id) {
-    return _ensureRevision(id).then((revision) {
-      var description = {'url': _getUrl(id), 'ref': _getRef(id)};
-      description['resolved-ref'] = revision;
-      return new PackageId(id.name, name, id.version, description);
-    });
-  }
-
-  List<Package> getCachedPackages() {
-    // TODO(keertip): Implement getCachedPackages().
-    throw new UnimplementedError(
-        "The git source doesn't support listing its cached packages yet.");
-  }
-
-  /// Resets all cached packages back to the pristine state of the Git
-  /// repository at the revision they are pinned to.
-  Future<Pair<int, int>> repairCachedPackages() async {
-    if (!dirExists(systemCacheRoot)) return new Pair(0, 0);
-
-    var successes = 0;
-    var failures = 0;
-
-    var packages = listDir(systemCacheRoot)
-        .where((entry) => dirExists(path.join(entry, ".git")))
-        .map((packageDir) => new Package.load(null, packageDir,
-            systemCache.sources))
-        .toList();
-
-    // Note that there may be multiple packages with the same name and version
-    // (pinned to different commits). The sort order of those is unspecified.
-    packages.sort(Package.orderByNameAndVersion);
-
-    for (var package in packages) {
-      log.message("Resetting Git repository for "
-          "${log.bold(package.name)} ${package.version}...");
-
-      try {
-        // Remove all untracked files.
-        await git.run(["clean", "-d", "--force", "-x"],
-            workingDir: package.dir);
-
-        // Discard all changes to tracked files.
-        await git.run(["reset", "--hard", "HEAD"], workingDir: package.dir);
-
-        successes++;
-      } on git.GitException catch (error, stackTrace) {
-        log.error("Failed to reset ${log.bold(package.name)} "
-            "${package.version}. Error:\n$error");
-        log.fine(stackTrace);
-        failures++;
-
-        tryDeleteEntry(package.dir);
-      }
-    }
-
-    return new Pair(successes, failures);
-  }
-
-  /// Ensure that the canonical clone of the repository referred to by [id] (the
-  /// one in `<system cache>/git/cache`) exists and contains the revision
-  /// referred to by [id].
-  ///
-  /// Returns a future that completes to the hash of the revision identified by
-  /// [id].
-  Future<String> _ensureRevision(PackageId id) {
-    return new Future.sync(() {
-      var path = _repoCachePath(id);
-      if (!entryExists(path)) {
-        return _clone(_getUrl(id), path, mirror: true)
-            .then((_) => _getRev(id));
-      }
-
-      // If [id] didn't come from a lockfile, it may be using a symbolic
-      // reference. We want to get the latest version of that reference.
-      var description = id.description;
-      if (description is! Map || !description.containsKey('resolved-ref')) {
-        return _updateRepoCache(id).then((_) => _getRev(id));
-      }
-
-      // If [id] did come from a lockfile, then we want to avoid running "git
-      // fetch" if possible to avoid networking time and errors. See if the
-      // revision exists in the repo cache before updating it.
-      return _getRev(id).catchError((error) {
-        if (error is! git.GitException) throw error;
-        return _updateRepoCache(id).then((_) => _getRev(id));
-      });
-    });
-  }
-
-  /// Runs "git fetch" in the canonical clone of the repository referred to by
-  /// [id].
-  ///
-  /// This assumes that the canonical clone already exists.
-  Future _updateRepoCache(PackageId id) {
-    var path = _repoCachePath(id);
-    if (_updatedRepos.contains(path)) return new Future.value();
-    return git.run(["fetch"], workingDir: path).then((_) {
-      _updatedRepos.add(path);
-    });
-  }
-
-  /// Runs "git rev-list" in the canonical clone of the repository referred to
-  /// by [id] on the effective ref of [id].
-  ///
-  /// This assumes that the canonical clone already exists.
-  Future<String> _getRev(PackageId id) {
-    return git.run(["rev-list", "--max-count=1", _getEffectiveRef(id)],
-        workingDir: _repoCachePath(id)).then((result) => result.first);
-  }
-
-  /// Clones the repo at the URI [from] to the path [to] on the local
-  /// filesystem.
-  ///
-  /// If [mirror] is true, creates a bare, mirrored clone. This doesn't check
-  /// out the working tree, but instead makes the repository a local mirror of
-  /// the remote repository. See the manpage for `git clone` for more
-  /// information.
-  ///
-  /// If [shallow] is true, creates a shallow clone that contains no history
-  /// for the repository.
-  Future _clone(String from, String to, {bool mirror: false,
-      bool shallow: false}) {
-    return new Future.sync(() {
-      // Git on Windows does not seem to automatically create the destination
-      // directory.
-      ensureDir(to);
-      var args = ["clone", from, to];
-
-      if (mirror) args.insert(1, "--mirror");
-      if (shallow) args.insertAll(1, ["--depth", "1"]);
-
-      return git.run(args);
-    }).then((result) => null);
-  }
-
-  /// Checks out the reference [ref] in [repoPath].
-  Future _checkOut(String repoPath, String ref) {
-    return git.run(["checkout", ref], workingDir: repoPath).then(
-        (result) => null);
-  }
-
-  /// Returns the path to the canonical clone of the repository referred to by
-  /// [id] (the one in `<system cache>/git/cache`).
-  String _repoCachePath(PackageId id) {
-    var repoCacheName = '${id.name}-${sha1(_getUrl(id))}';
-    return path.join(systemCacheRoot, 'cache', repoCacheName);
-  }
-
-  /// Returns the repository URL for [id].
-  ///
-  /// [description] may be a description or a [PackageId].
-  String _getUrl(description) {
-    description = _getDescription(description);
-    if (description is String) return description;
-    return description['url'];
-  }
-
-  /// Returns the commit ref that should be checked out for [description].
-  ///
-  /// This differs from [_getRef] in that it doesn't just return the ref in
-  /// [description]. It will return a sensible default if that ref doesn't
-  /// exist, and it will respect the "resolved-ref" parameter set by
-  /// [resolveId].
-  ///
-  /// [description] may be a description or a [PackageId].
-  String _getEffectiveRef(description) {
-    description = _getDescription(description);
-    if (description is Map && description.containsKey('resolved-ref')) {
-      return description['resolved-ref'];
-    }
-
-    var ref = _getRef(description);
-    return ref == null ? 'HEAD' : ref;
-  }
-
-  /// Returns the commit ref for [description], or null if none is given.
-  ///
-  /// [description] may be a description or a [PackageId].
-  String _getRef(description) {
-    description = _getDescription(description);
-    if (description is String) return null;
-    return description['ref'];
-  }
-
-  /// Returns [description] if it's a description, or [PackageId.description] if
-  /// it's a [PackageId].
-  _getDescription(description) {
-    if (description is PackageId) return description.description;
-    return description;
-  }
-}