Add offline support to pub install and update.

sdk/lib/_internal/pub/test/descriptor.dart

 // Copyright (c) 2013, 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.
 
 /// Pub-specific scheduled_test descriptors.
 library descriptor;
 
 import 'package:oauth2/oauth2.dart' as oauth2;
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:scheduled_test/scheduled_test.dart';
@@ skipping 65 matching lines @@
   // Default to printing the name if no other code was given.
   if (code == null) {
     code = name;
   }
 
   return dir("lib", [
     file("$name.dart", 'main() => "$code";')
   ]);
 }
 
-/// Describes a directory for a package installed from the mock package server.
-/// This directory is of the form found in the global package cache.
-Descriptor packageCacheDir(String name, String version) {
-  return dir("$name-$version", [
-    libDir(name, '$name $version')
-  ]);
-}
-
 /// Describes a directory for a Git package. This directory is of the form
 /// found in the revision cache of the global package cache.
 Descriptor gitPackageRevisionCacheDir(String name, [int modifier]) {
   var value = name;
   if (modifier != null) value = "$name $modifier";
   return pattern(new RegExp("$name${r'-[a-f0-9]+'}"),
       (dirName) => dir(dirName, [libDir(name, value)]));
 }
 
 /// Describes a directory for a Git package. This directory is of the form
@@ skipping 26 matching lines @@
   });
   return dir(packagesPath, contents);
 }
 
 /// Describes the global package cache directory containing all the given
 /// [packages], which should be name/version pairs. The packages will be
 /// validated against the format produced by the mock package server.
 ///
 /// A package's value may also be a list of versions, in which case all
 /// versions are expected to be installed.
-Descriptor cacheDir(Map packages) {
+///
+/// If [includePubspecs] is `true`, then pubspecs will be created for each
+/// package. Defaults to `false` so that the contents of pubspecs are not
+/// validated since they will often lack the dependencies section that the
+/// real pubspec being compared against has. You usually only need to pass
+/// `true` for this if you plan to call [create] on the resulting descriptor.
+Descriptor cacheDir(Map packages, {bool includePubspecs: false}) {
   var contents = <Descriptor>[];
   packages.forEach((name, versions) {
     if (versions is! List) versions = [versions];
     for (var version in versions) {
-      contents.add(packageCacheDir(name, version));
+      var packageContents = [libDir(name, '$name $version')];
+      if (includePubspecs) {
+        packageContents.add(libPubspec(name, version));
+      }
+      contents.add(dir("$name-$version", packageContents));
     }
   });
+
   return dir(cachePath, [
     dir('hosted', [
       async(port.then((p) => dir('localhost%58$p', contents)))
     ])
   ]);
 }
 
 /// Describes the file in the system cache that contains the client's OAuth2
 /// credentials. The URL "/token" on [server] will be used as the token
 /// endpoint for refreshing the access token.
@@ skipping 11 matching lines @@
           ['https://www.googleapis.com/auth/userinfo.email'],
           expiration).toJson())
     ]);
   }));
 }
 
 /// Describes the application directory, containing only a pubspec specifying
 /// the given [dependencies].
 DirectoryDescriptor appDir(List dependencies) =>
   dir(appPath, [appPubspec(dependencies)]);