1#!/usr/bin/env python 2 3# Copyright 2016 Google Inc. 4# 5# Use of this source code is governed by a BSD-style license that can be 6# found in the LICENSE file. 7 8import hashlib 9import os 10import shutil 11import stat 12import sys 13import urllib2 14 15os.chdir(os.path.join(os.path.dirname(__file__), os.pardir)) 16 17gn_path = 'buildtools/linux64/gn' if 'linux' in sys.platform else \ 18 'buildtools/mac/gn' if 'darwin' in sys.platform else \ 19 'buildtools/win/gn.exe' 20 21sha1 = open(gn_path + '.sha1').read().strip() 22 23def sha1_of_file(path): 24 h = hashlib.sha1() 25 if os.path.isfile(path): 26 with open(path, 'rb') as f: 27 h.update(f.read()) 28 return h.hexdigest() 29 30if sha1_of_file(gn_path) != sha1: 31 with open(gn_path, 'wb') as f: 32 f.write(urllib2.urlopen('https://chromium-gn.storage-download.googleapis.com/' + sha1).read()) 33 34 os.chmod(gn_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IXUSR | 35 stat.S_IRGRP | stat.S_IXGRP | 36 stat.S_IROTH | stat.S_IXOTH ) 37 38gn_copy_path = os.path.join('bin', os.path.basename(gn_path)) 39if sha1_of_file(gn_copy_path) != sha1: 40 shutil.copy(gn_path, gn_copy_path) 41 42