Don't extract the name of a package from its description.

utils/pub/entrypoint.dart

 // 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('entrypoint');
 
 #import('io.dart');
 #import('lock_file.dart');
 #import('package.dart');
 #import('root_source.dart');
@@ skipping 88 matching lines @@
 
     return future;
   }
 
   /**
    * Installs all dependencies of the [root] package to its "packages"
    * directory, respecting the [LockFile] if present. Returns a [Future] that
    * completes when all dependencies are installed.
    */
   Future installDependencies() {
-    return _validatePubspec()
-      .chain((_) => _loadLockFile())
+    return _loadLockFile()
       .chain((lockFile) => resolveVersions(cache.sources, root, lockFile))
       .chain(_installDependencies);
   }
 
   /**
    * Installs the latest available versions of all dependencies of the [root]
    * package to its "package" directory, writing a new [LockFile]. Returns a
    * [Future] that completes when all dependencies are installed.
    */
   Future updateAllDependencies() {
-    return _validatePubspec()
-      .chain((_) => resolveVersions(cache.sources, root, new LockFile.empty()))
+    return resolveVersions(cache.sources, root, new LockFile.empty())
       .chain(_installDependencies);
   }
 
   /**
    * Installs the latest available versions of [dependencies], while leaving
    * other dependencies as specified by the [LockFile] if possible. Returns a
    * [Future] that completes when all dependencies are installed.
    */
   Future updateDependencies(List<String> dependencies) {
-    return _validatePubspec().chain((_) => _loadLockFile()).chain((lockFile) {
+    return _loadLockFile().chain((lockFile) {
       var versionSolver = new VersionSolver(cache.sources, root, lockFile);
       for (var dependency in dependencies) {
         versionSolver.useLatestVersion(dependency);
       }
       return versionSolver.solve();
     }).chain(_installDependencies);
   }
 
   /**
    * Installs all dependencies listed in [packageVersions] and writes a
@@ skipping 148 matching lines @@
   /**
    * Creates a symlink to the `packages` directory in [dir] if none exists.
    */
   Future _linkSecondaryPackageDir(String dir) {
     var to = join(dir, 'packages');
     return exists(to).chain((exists) {
       if (exists) return new Future.immediate(null);
       return createSymlink(path, to);
     });
   }
-
-  /**
-   * Validate that the pubspec for the entrypoint exists and specifies the name
-   * of the root package.
-   */
-  Future _validatePubspec() {
-    var future = new Future.immediate(null);;
-    if (root.pubspec.isEmpty) {
-      future = exists(join(root.dir, "pubspec.yaml")).transform((exists) {
-        if (exists) return;
-        throw 'Could not find a file named "pubspec.yaml" in the directory '
-          '$path.';
-      });
-    }
-
-    return future.transform((_) {
-      if (root.pubspec.name != null) return;
-      throw '"pubspec.yaml" is missing the required "name" field (e.g. "name: '
-        '${root.name}").';
-    });
-  }
 }