66 lines · python
1#!/usr/bin/env python32"""Downloads a prebuilt gn binary to a place where gn.py can find it."""3 4import io5import os6import sys7import urllib.request8import zipfile9 10 11def download_and_unpack(url, output_dir, gn):12 """Download an archive from url and extract gn from it into output_dir."""13 print("downloading %s ..." % url, end="")14 sys.stdout.flush()15 data = urllib.request.urlopen(url).read()16 print(" done")17 zipfile.ZipFile(io.BytesIO(data)).extract(gn, path=output_dir)18 19 20def set_executable_bit(path):21 mode = os.stat(path).st_mode22 mode |= (mode & 0o444) >> 2 # Copy R bits to X.23 os.chmod(path, mode) # No-op on Windows.24 25 26def get_platform():27 import platform28 29 if sys.platform == "darwin":30 return "mac-amd64" if platform.machine() != "arm64" else "mac-arm64"31 if platform.machine() not in ("AMD64", "x86_64"):32 return None33 if sys.platform.startswith("linux"):34 return "linux-amd64"35 if sys.platform == "win32":36 return "windows-amd64"37 38 39def main():40 platform = get_platform()41 if not platform:42 print("no prebuilt binary for", sys.platform)43 print("build it yourself with:")44 print(" rm -rf /tmp/gn &&")45 print(" pushd /tmp && git clone https://gn.googlesource.com/gn &&")46 print(" cd gn && build/gen.py && ninja -C out gn && popd &&")47 print(" cp /tmp/gn/out/gn somewhere/on/PATH")48 return 149 dirname = os.path.join(os.path.dirname(__file__), "bin", platform)50 if not os.path.exists(dirname):51 os.makedirs(dirname)52 53 url = "https://chrome-infra-packages.appspot.com/dl/gn/gn/%s/+/latest"54 gn = "gn" + (".exe" if sys.platform == "win32" else "")55 if platform == "mac-arm64": # For https://openradar.appspot.com/FB891424356 try:57 os.remove(os.path.join(dirname, gn))58 except OSError:59 pass60 download_and_unpack(url % platform, dirname, gn)61 set_executable_bit(os.path.join(dirname, gn))62 63 64if __name__ == "__main__":65 sys.exit(main())66