1# Copyright 2014 the V8 project 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 7import os 8import sys 9 10 11def directory_really_is_depot_tools(directory): 12 return os.path.isfile(os.path.join(directory, 'gclient.py')) 13 14 15def add_depot_tools_to_path(): 16 """Search for depot_tools and add it to sys.path.""" 17 # First look if depot_tools is already in PYTHONPATH. 18 for i in sys.path: 19 if i.rstrip(os.sep).endswith('depot_tools'): 20 if directory_really_is_depot_tools(i): 21 return i 22 23 # Then look if depot_tools is in PATH, common case. 24 for i in os.environ['PATH'].split(os.pathsep): 25 if i.rstrip(os.sep).endswith('depot_tools'): 26 if directory_really_is_depot_tools(i): 27 sys.path.insert(0, 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 if directory_really_is_depot_tools(os.path.join(root_dir, 'depot_tools')): 34 i = os.path.join(root_dir, 'depot_tools') 35 sys.path.insert(0, 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