| #!/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()) |