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#!/usr/bin/env python3
"""Downloads a prebuilt gn binary to a place where gn.py can find it."""
import io
import os
import sys
import urllib.request
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 = urllib.request.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 sys.platform == 'darwin':
return 'mac-amd64' if platform.machine() != 'arm64' else 'mac-arm64'
if platform.machine() not in ('AMD64', 'x86_64'):
return None
if sys.platform.startswith('linux'):
return 'linux-amd64'
if sys.platform == 'win32':
return 'windows-amd64'
def main():
platform = get_platform()
if not platform:
print('no prebuilt binary for', sys.platform)
print('build it yourself with:')
print(' rm -rf /tmp/gn &&')
print(' pushd /tmp && git clone https://gn.googlesource.com/gn &&')
print(' cd gn && build/gen.py && ninja -C out gn && popd &&')
print(' cp /tmp/gn/out/gn somewhere/on/PATH')
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 '')
if platform == 'mac-arm64': # For https://openradar.appspot.com/FB8914243
try: os.remove(os.path.join(dirname, gn))
except OSError: pass
download_and_unpack(url % platform, dirname, gn)
set_executable_bit(os.path.join(dirname, gn))
if __name__ == '__main__':
sys.exit(main())
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