Adding weekly tool to help with weekly snippets

gclient_utils.py

 # Copyright 2009 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 305 matching lines @@
   """Returns the difference subpath minus root."""
   root = os.path.realpath(root)
   subpath = os.path.realpath(subpath)
   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."""
+  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
+    (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)
+
+  if not config_path:
+    print "Can't find", config_file
+    return None
+
+  env = {}
+  execfile(config_path, env)
+  config_dir = os.path.dirname(config_path)
+  return config_dir, env['entries']