derek.holloway
7502bf64a4
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66 lines
2.0 KiB
Python
Executable File
66 lines
2.0 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Downloads a prebuilt gn binary to a place where gn.py can find it."""
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import io
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import os
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import sys
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import urllib.request
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import zipfile
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def download_and_unpack(url, output_dir, gn):
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"""Download an archive from url and extract gn from it into output_dir."""
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print("downloading %s ..." % url, end="")
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sys.stdout.flush()
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data = urllib.request.urlopen(url).read()
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print(" done")
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zipfile.ZipFile(io.BytesIO(data)).extract(gn, path=output_dir)
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def set_executable_bit(path):
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mode = os.stat(path).st_mode
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mode |= (mode & 0o444) >> 2 # Copy R bits to X.
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os.chmod(path, mode) # No-op on Windows.
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def get_platform():
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import platform
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if sys.platform == "darwin":
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return "mac-amd64" if platform.machine() != "arm64" else "mac-arm64"
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if platform.machine() not in ("AMD64", "x86_64"):
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return None
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if sys.platform.startswith("linux"):
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return "linux-amd64"
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if sys.platform == "win32":
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return "windows-amd64"
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def main():
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platform = get_platform()
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if not platform:
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print("no prebuilt binary for", sys.platform)
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print("build it yourself with:")
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print(" rm -rf /tmp/gn &&")
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print(" pushd /tmp && git clone https://gn.googlesource.com/gn &&")
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print(" cd gn && build/gen.py && ninja -C out gn && popd &&")
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print(" cp /tmp/gn/out/gn somewhere/on/PATH")
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return 1
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dirname = os.path.join(os.path.dirname(__file__), "bin", platform)
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if not os.path.exists(dirname):
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os.makedirs(dirname)
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url = "https://chrome-infra-packages.appspot.com/dl/gn/gn/%s/+/latest"
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gn = "gn" + (".exe" if sys.platform == "win32" else "")
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if platform == "mac-arm64": # For https://openradar.appspot.com/FB8914243
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try:
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os.remove(os.path.join(dirname, gn))
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except OSError:
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pass
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download_and_unpack(url % platform, dirname, gn)
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set_executable_bit(os.path.join(dirname, gn))
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if __name__ == "__main__":
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sys.exit(main())
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