78 lines
2 KiB
Python
78 lines
2 KiB
Python
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#!/usr/bin/env nix-shell
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#! nix-shell -i python -p "python3.withPackages (ps: with ps; [ ps.absl-py ps.requests ])"
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import hashlib
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import io
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import json
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import os.path
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import tarfile
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import requests
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from absl import app, flags
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BASE_NAME = "Install_NDI_SDK_v5_Linux"
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NDI_SDK_URL = f"https://downloads.ndi.tv/SDK/NDI_SDK_Linux/{BASE_NAME}.tar.gz"
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NDI_EXEC = f"{BASE_NAME}.sh"
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NDI_ARCHIVE_MAGIC = b"__NDI_ARCHIVE_BEGIN__\n"
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FLAG_out = flags.DEFINE_string("out", None, "Path to read/write version.json from/to.")
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def find_version_json() -> str:
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if FLAG_out.value:
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return FLAG_out.value
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try_paths = ["pkgs/development/libraries/ndi/version.json", "version.json"]
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for path in try_paths:
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if os.path.exists(path):
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return path
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raise Exception(
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"Couldn't figure out where to write version.json; try specifying --out"
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)
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def fetch_tarball() -> bytes:
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r = requests.get(NDI_SDK_URL)
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r.raise_for_status()
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return r.content
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def read_version(tarball: bytes) -> str:
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# Find the inner script.
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outer_tarfile = tarfile.open(fileobj=io.BytesIO(tarball), mode="r:gz")
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eula_script = outer_tarfile.extractfile(NDI_EXEC).read()
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# Now find the archive embedded within the script.
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archive_start = eula_script.find(NDI_ARCHIVE_MAGIC) + len(NDI_ARCHIVE_MAGIC)
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inner_tarfile = tarfile.open(
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fileobj=io.BytesIO(eula_script[archive_start:]), mode="r:gz"
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)
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# Now find Version.txt...
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version_txt = (
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inner_tarfile.extractfile("NDI SDK for Linux/Version.txt")
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.read()
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.decode("utf-8")
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)
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_, _, version = version_txt.strip().partition(" v")
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return version
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def main(argv):
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tarball = fetch_tarball()
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sha256 = hashlib.sha256(tarball).hexdigest()
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version = {
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"hash": f"sha256:{sha256}",
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"version": read_version(tarball),
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}
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out_path = find_version_json()
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with open(out_path, "w") as f:
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json.dump(version, f)
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f.write("\n")
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if __name__ == "__main__":
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app.run(main)
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