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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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