2 """Downloads a prebuilt gn binary to a place where gn.py can find it."""
4 from __future__ import print_function
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='')
17 data = urllib2.urlopen(url).read()
19 zipfile.ZipFile(io.BytesIO(data)).extract(gn, path=output_dir)
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.
30 if platform.machine() not in ('AMD64', 'x86_64'):
32 if sys.platform.startswith('linux'):
34 if sys.platform == 'darwin':
36 if sys.platform == 'win32':
37 return 'windows-amd64'
41 platform = get_platform()
43 print('no prebuilt binary for', sys.platform)
46 dirname = os.path.join(os.path.dirname(__file__), 'bin', platform)
47 if not os.path.exists(dirname):
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))
56 if __name__ == '__main__':