89 lines
2.6 KiB
Python
89 lines
2.6 KiB
Python
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#!/usr/bin/env python3
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"""Fetch the pinned Linux libmpv prefix named by mpv-build.lock.json.
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Reads artifacts.linux for this machine's architecture, downloads the asset,
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verifies its SHA-256 against the lock before a single byte is extracted, then
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untars the self-relocating prefix tree into --dest. Shared by build.yml,
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ci.yml, and local packaging builds so the contract lives in one place.
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"""
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import argparse
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import hashlib
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import json
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import platform
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import shutil
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import subprocess
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import sys
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import tempfile
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import urllib.request
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from pathlib import Path
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ROOT = Path(__file__).resolve().parents[1]
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DEFAULT_LOCK = ROOT / "mpv-build.lock.json"
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def main() -> int:
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parser = argparse.ArgumentParser(
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description="Download and verify the locked Linux libmpv prefix."
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)
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parser.add_argument(
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"--lock",
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type=Path,
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default=DEFAULT_LOCK,
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help="path to mpv-build.lock.json (default: the repository lock)",
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)
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parser.add_argument(
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"--dest",
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type=Path,
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default=Path("libmpv-prefix"),
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help="directory to extract the prefix tree into (default: libmpv-prefix)",
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)
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args = parser.parse_args()
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if shutil.which("zstd") is None:
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print(
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"Error: zstd is required to extract the libmpv archive "
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"(install it, e.g. apt-get install zstd)",
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file=sys.stderr,
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)
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return 1
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lock = json.loads(args.lock.read_text(encoding="utf-8"))
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group = lock["artifacts"]["linux"]
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machine = platform.machine()
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entry = group["assets"].get(machine)
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if entry is None:
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print(
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f"Error: {args.lock}: no linux asset for {machine!r} "
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f"(locked: {', '.join(sorted(group['assets']))})",
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file=sys.stderr,
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)
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return 1
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url = f"{group['assetBase']}/{entry['asset']}"
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print(f"fetching {url}", flush=True)
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with urllib.request.urlopen(url) as response:
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data = response.read()
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digest = hashlib.sha256(data).hexdigest()
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if digest != entry["checksum"]:
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print(
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f"Error: {entry['asset']}: SHA-256 {digest} does not match "
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f"locked {entry['checksum']}",
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file=sys.stderr,
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)
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return 1
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args.dest.mkdir(parents=True, exist_ok=True)
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with tempfile.NamedTemporaryFile(suffix=".tar.zst") as archive:
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archive.write(data)
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archive.flush()
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subprocess.run(
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["tar", "--zstd", "-xf", archive.name, "-C", str(args.dest)],
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check=True,
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)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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