Add repo-managed checkout support to trychange.py

gclient_utils.py

 # Copyright (c) 2011 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.
 
 """Generic utils."""
 
 import errno
 import logging
 import os
 import Queue
@@ skipping 414 matching lines @@
   if not subpath.startswith(root):
     return None
   # If the root does not have a trailing \ or /, we add it so the returned
   # path starts immediately after the seperator regardless of whether it is
   # provided.
   root = os.path.join(root, '')
   return subpath[len(root):]
 
 
 def FindFileUpwards(filename, path=None):
-  """Search upwards from the a directory (default: current) to find a file."""
+  """Search upwards from the a directory (default: current) to find a file.
+  
+  Returns nearest upper-level directory with the passed in file.
+  """
   if not path:
     path = os.getcwd()
   path = os.path.realpath(path)
   while True:
     file_path = os.path.join(path, filename)
-    if os.path.isfile(file_path):
-      return file_path
+    if os.path.exists(file_path):
+      return path
     (new_path, _) = os.path.split(path)
     if new_path == path:
       return None
     path = new_path
 
 
 def GetGClientRootAndEntries(path=None):
   """Returns the gclient root and the dict of entries."""
   config_file = '.gclient_entries'
-  config_path = FindFileUpwards(config_file, path)
+  config_path = os.path.join(FindFileUpwards(config_file, path), config_file)
 
   if not config_path:
     print "Can't find %s" % config_file
     return None
 
   env = {}
   execfile(config_path, env)
   config_dir = os.path.dirname(config_path)
   return config_dir, env['entries']
 
@@ skipping 195 matching lines @@
         logging.info('Caught exception in thread %s' % self.item.name)
         logging.info(str(sys.exc_info()))
         work_queue.exceptions.put(sys.exc_info())
       logging.info('_Worker.run(%s) done' % self.item.name)
 
       work_queue.ready_cond.acquire()
       try:
         work_queue.ready_cond.notifyAll()
       finally:
         work_queue.ready_cond.release()