Add resource locking in gclient

gclient.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Meta checkout manager supporting both Subversion and GIT."""
 # Files
 #   .gclient      : Current client configuration, written by 'config' command.
 #                   Format is a Python script defining 'solutions', a list whose
 #                   entries each are maps binding the strings "name" and "url"
@@ skipping 357 matching lines @@
     # dependency.  It is read from the actual DEPS file so cannot be set on
     # class instantiation.
     self.recursion_override = None
     # recursedeps is a mutable value that selectively overrides the default
     # 'no recursion' setting on a dep-by-dep basis.  It will replace
     # recursion_override.
     #
     # It will be a dictionary of {deps_name: {"deps_file": depfile_name}} or
     # None.
     self.recursedeps = None
+    # This is inherited from WorkItem.  We want the URL to be a resource.
+    if url and isinstance(url, basestring):
+      # The url is usually given to gclient either as https://blah@123
+      # or just https://blah.  The @123 portion is irrelevent.
+      self.resources.append(url.split('@')[0])
 
     if not self.name and self.parent:
       raise gclient_utils.Error('Dependency without name')
 
   @property
   def requirements(self):
     """Calculate the list of requirements."""
     requirements = set()
     # self.parent is implicitly a requirement. This will be recursive by
     # definition.
@@ skipping 1962 matching lines @@
 
 
 if '__main__' == __name__:
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)
 
 # vim: ts=2:sw=2:tw=80:et: