Start pulling pub from its own repo.

tools/make_links.py

 #!/usr/bin/env python
 # 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.
 
 
 """Tool for creating symlinks from SOURCES to TARGET.
 
 For each SOURCE in SOURCES create a link from SOURCE to TARGET.  If a
 SOURCE ends with .../lib, the lib suffix is ignored when determining
 the name of the target link.
 
+If a SOURCE contains ":", the left side is the path and the right side is the
+name of the package symlink.
+
 Before creating any links, the old entries of the TARGET directory will be
 removed.
 
 Usage:
   python tools/make_links.py OPTIONS TARGET SOURCES...
+
 """
 
 import optparse
 import os
 import shutil
 import subprocess
 import sys
 import utils
 
 
@@ skipping 49 matching lines @@
       if os.path.isdir(full_link) and utils.IsWindows():
         # It seems like python on Windows is treating pseudo symlinks to
         # directories as directories.
         os.rmdir(full_link)
       else:
         os.remove(full_link)
   else:
     os.makedirs(target)
   for source in args[1:]:
     # Assume the source directory is named ".../NAME/lib".
-    (name, lib) = os.path.split(source)
+    split = source.split(':')
+    name = None
+    if len(split) == 2: (source, name) = split
+
+    (path, lib) = os.path.split(source)
     if lib != 'lib':
-      name = source
-    # Remove any addtional path components preceding NAME.
-    (path, name) = os.path.split(name)
+      path = source
+    # Remove any additional path components preceding NAME, if one wasn't
+    # specified explicitly.
+    if not name: (_, name) = os.path.split(path)
     orig_source = source
     if utils.GuessOS() == 'win32':
       source = os.path.relpath(source)
     else:
       source = os.path.relpath(source, start=target)
     exit_code = make_link(source, os.path.join(target, name), orig_source)
     if exit_code != 0:
       return exit_code
   create_timestamp_file(options)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))