blob: 00c918fd97c740dd74ae8a9c4aa004c18f3516af [file] [log] [blame]
// 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.
import 'dart:io';
import 'package:path/path.dart' as p;
import 'io.dart';
import 'io.dart' as io show createTempDir;
import 'log.dart' as log;
import 'package.dart';
import 'package_name.dart';
import 'source.dart';
import 'source/cached.dart';
import 'source/git.dart';
import 'source/hosted.dart';
import 'source/path.dart';
import 'source/sdk.dart';
import 'source/unknown.dart';
import 'source_registry.dart';
/// The system-wide cache of downloaded packages.
/// This cache contains all packages that are downloaded from the internet.
/// Packages that are available locally (e.g. path dependencies) don't use this
/// cache.
class SystemCache {
/// The root directory where this package cache is located.
final String rootDir;
String get tempDir => p.join(rootDir, '_temp');
static String defaultDir = (() {
if (Platform.environment.containsKey('PUB_CACHE')) {
return Platform.environment['PUB_CACHE'];
} else if (Platform.isWindows) {
// %LOCALAPPDATA% is preferred as the cache location over %APPDATA%, because the latter is synchronised between
// devices when the user roams between them, whereas the former is not.
// The default cache dir used to be in %APPDATA%, so to avoid breaking old installs,
// we use the old dir in %APPDATA% if it exists. Else, we use the new default location
var appData = Platform.environment['APPDATA'];
var appDataCacheDir = p.join(appData, 'Pub', 'Cache');
if (dirExists(appDataCacheDir)) {
return appDataCacheDir;
var localAppData = Platform.environment['LOCALAPPDATA'];
return p.join(localAppData, 'Pub', 'Cache');
} else {
return '${Platform.environment['HOME']}/.pub-cache';
/// The registry for sources used by this system cache.
/// New sources registered here will be available through the [source]
/// function.
final sources = SourceRegistry();
/// The sources bound to this cache.
final _boundSources = <Source, BoundSource>{};
/// The built-in Git source bound to this cache.
BoundGitSource get git => _boundSources[sources.git] as BoundGitSource;
/// The built-in hosted source bound to this cache.
BoundHostedSource get hosted =>
_boundSources[sources.hosted] as BoundHostedSource;
/// The built-in path source bound to this cache.
BoundPathSource get path => _boundSources[sources.path] as BoundPathSource;
/// The built-in SDK source bound to this cache.
BoundSdkSource get sdk => _boundSources[sources.sdk] as BoundSdkSource;
/// The default source bound to this cache.
BoundSource get defaultSource => source(sources[null]);
/// Creates a system cache and registers all sources in [sources].
/// If [isOffline] is `true`, then the offline hosted source will be used.
/// Defaults to `false`.
SystemCache({String rootDir, bool isOffline = false})
: rootDir = rootDir ?? SystemCache.defaultDir {
for (var source in sources.all) {
if (source is HostedSource) {
_boundSources[source] = source.bind(this, isOffline: isOffline);
} else {
_boundSources[source] = source.bind(this);
/// Returns the version of [source] bound to this cache.
BoundSource source(Source source) =>
_boundSources.putIfAbsent(source, () => source.bind(this));
/// Loads the package identified by [id].
/// Throws an [ArgumentError] if [id] has an invalid source.
Package load(PackageId id) {
if (id.source is UnknownSource) {
throw ArgumentError('Unknown source ${id.source}.');
return Package.load(, source(id.source).getDirectory(id), sources);
/// Determines if the system cache contains the package identified by [id].
bool contains(PackageId id) {
var source = this.source(id.source);
if (source is CachedSource) return source.isInSystemCache(id);
throw ArgumentError('Package $id is not cacheable.');
/// Create a new temporary directory within the system cache.
/// The system cache maintains its own temporary directory that it uses to
/// stage packages into while downloading. It uses this instead of the OS's
/// system temp directory to ensure that it's on the same volume as the pub
/// system cache so that it can move the directory from it.
String createTempDir() {
var temp = ensureDir(tempDir);
return io.createTempDir(temp, 'dir');
/// Deletes the system cache's internal temp directory.
void deleteTempDir() {
log.fine('Clean up system cache temp directory $tempDir.');
if (dirExists(tempDir)) deleteEntry(tempDir);