#!/usr/bin/env python """Downloads a prebuilt gn binary to a place where gn.py can find it.""" from __future__ import print_function import io import os import urllib2 import sys import zipfile def download_and_unpack(url, output_dir, gn): """Download an archive from url and extract gn from it into output_dir.""" print('downloading %s ...' % url, end='') sys.stdout.flush() data = urllib2.urlopen(url).read() print(' done') zipfile.ZipFile(io.BytesIO(data)).extract(gn, path=output_dir) def set_executable_bit(path): mode = os.stat(path).st_mode mode |= (mode & 0o444) >> 2 # Copy R bits to X. os.chmod(path, mode) # No-op on Windows. def get_platform(): import platform if platform.machine() not in ('AMD64', 'x86_64'): return None if sys.platform.startswith('linux'): return 'linux-amd64' if sys.platform == 'darwin': return 'mac-amd64' if sys.platform == 'win32': return 'windows-amd64' def main(): platform = get_platform() if not platform: print('no prebuilt binary for', sys.platform) return 1 dirname = os.path.join(os.path.dirname(__file__), 'bin', platform) if not os.path.exists(dirname): os.makedirs(dirname) url = 'https://chrome-infra-packages.appspot.com/dl/gn/gn/%s/+/latest' gn = 'gn' + ('.exe' if sys.platform == 'win32' else '') download_and_unpack(url % platform, dirname, gn) set_executable_bit(os.path.join(dirname, gn)) if __name__ == '__main__': sys.exit(main())