Support relative paths in path dependencies.

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 'dart:async';
 
 import '../../pkg/path/lib/path.dart' as path;
 
@@ skipping 191 matching lines @@
                 "package.");
       }
     });
   }
 
   /// Loads the list of concrete package versions from the `pubspec.lock`, if it
   /// exists. If it doesn't, this completes to an empty [LockFile].
   LockFile loadLockFile() {
     var lockFilePath = path.join(root.dir, 'pubspec.lock');
     if (!fileExists(lockFilePath)) return new LockFile.empty();
-    return new LockFile.parse(readTextFile(lockFilePath), cache.sources);
+    return new LockFile.load(lockFilePath, cache.sources);
   }
 
   /// Saves a list of concrete package versions to the `pubspec.lock` file.
   void _saveLockFile(List<PackageId> packageIds) {
     var lockFile = new LockFile.empty();
     for (var id in packageIds) {
       if (!id.isRoot) lockFile.packages[id.name] = id;
     }
 
     var lockFilePath = path.join(root.dir, 'pubspec.lock');
@@ skipping 64 matching lines @@
           fileAndSubfiles.addAll(subfiles);
           return fileAndSubfiles;
         });
       }).toList());
     }).then(flatten);
   }
 
   /// Creates a symlink to the `packages` directory in [dir] if none exists.
   Future _linkSecondaryPackageDir(String dir) {
     return defer(() {
-      var to = path.join(dir, 'packages');
-      if (entryExists(to)) return;
-      return createSymlink(packagesDir, to);
+      var symlink = path.join(dir, 'packages');
+      if (entryExists(symlink)) return;
+      return createSymlink(packagesDir, symlink);
     });
   }
 }