utils/gn/get.py

   1 #!/usr/bin/env python
   2 """Downloads a prebuilt gn binary to a place where gn.py can find it."""
   3
   4 from __future__ import print_function
   5
   6 import io
   7 import os
   8 import urllib2
   9 import sys
  10 import zipfile
  11
  12
  13 def download_and_unpack(url, output_dir, gn):
  14     """Download an archive from url and extract gn from it into output_dir."""
  15     print('downloading %s ...' % url, end='')
  16     sys.stdout.flush()
  17     data = urllib2.urlopen(url).read()
  18     print(' done')
  19     zipfile.ZipFile(io.BytesIO(data)).extract(gn, path=output_dir)
  20
  21
  22 def set_executable_bit(path):
  23     mode = os.stat(path).st_mode
  24     mode |= (mode & 0o444) >> 2 # Copy R bits to X.
  25     os.chmod(path, mode) # No-op on Windows.
  26
  27
  28 def get_platform():
  29     import platform
  30     if platform.machine() not in ('AMD64', 'x86_64'):
  31         return None
  32     if sys.platform.startswith('linux'):
  33         return 'linux-amd64'
  34     if sys.platform == 'darwin':
  35         return 'mac-amd64'
  36     if sys.platform == 'win32':
  37         return 'windows-amd64'
  38
  39
  40 def main():
  41     platform = get_platform()
  42     if not platform:
  43         print('no prebuilt binary for', sys.platform)
  44         return 1
  45
  46     dirname = os.path.join(os.path.dirname(__file__), 'bin', platform)
  47     if not os.path.exists(dirname):
  48         os.makedirs(dirname)
  49
  50     url = 'https://chrome-infra-packages.appspot.com/dl/gn/gn/%s/+/latest'
  51     gn = 'gn' + ('.exe' if sys.platform == 'win32' else '')
  52     download_and_unpack(url % platform, dirname, gn)
  53     set_executable_bit(os.path.join(dirname, gn))
  54
  55
  56 if __name__ == '__main__':
  57     sys.exit(main())