tools/find_depot_tools.py

   1 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4 """Small utility function to find depot_tools and add it to the python path.
   5
   6 Will throw an ImportError exception if depot_tools can't be found since it
   7 imports breakpad.
   8 """
   9
  10 import os
  11 import sys
  12
  13
  14 def IsRealDepotTools(path):
  15   return os.path.isfile(os.path.join(path, 'gclient'))
  16
  17
  18 def add_depot_tools_to_path():
  19   """Search for depot_tools and add it to sys.path."""
  20   # First look if depot_tools is already in PYTHONPATH.
  21   for i in sys.path:
  22     if i.rstrip(os.sep).endswith('depot_tools') and IsRealDepotTools(i):
  23       return i
  24   # Then look if depot_tools is in PATH, common case.
  25   for i in os.environ['PATH'].split(os.pathsep):
  26     if IsRealDepotTools(i):
  27       sys.path.append(i.rstrip(os.sep))
  28       return i
  29   # Rare case, it's not even in PATH, look upward up to root.
  30   root_dir = os.path.dirname(os.path.abspath(__file__))
  31   previous_dir = os.path.abspath(__file__)
  32   while root_dir and root_dir != previous_dir:
  33     i = os.path.join(root_dir, 'depot_tools')
  34     if IsRealDepotTools(i):
  35       sys.path.append(i)
  36       return i
  37     previous_dir = root_dir
  38     root_dir = os.path.dirname(root_dir)
  39   print >> sys.stderr, 'Failed to find depot_tools'
  40   return None
  41
  42 add_depot_tools_to_path()
  43
  44 # pylint: disable=W0611
  45 import breakpad