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      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 
      8 import hashlib
      9 import os
     10 import shutil
     11 import stat
     12 import sys
     13 import urllib2
     14 
     15 os.chdir(os.path.join(os.path.dirname(__file__), os.pardir))
     16 
     17 gn_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 
     21 sha1 = open(gn_path + '.sha1').read().strip()
     22 
     23 def 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 
     30 if 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 
     38 gn_copy_path = os.path.join('bin', os.path.basename(gn_path))
     39 if sha1_of_file(gn_copy_path) != sha1:
     40   shutil.copy(gn_path, gn_copy_path)
     41 
     42