#!/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())