fetch-gn revision 7f660e84189adc92b1996b4b2e0f5a1ad897dff9 
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