scripts/build_checksums.py

#!/usr/bin/env python3
"""Regenerate the deterministic SHA-256 inventory for the staged package."""

from __future__ import annotations

import hashlib
from pathlib import Path


EXCLUDED = {
    "audit_tmp.py",
    "metadata/checksums.sha256",
    "metadata/validation_run.json",
}


def sha256(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as handle:
        for chunk in iter(lambda: handle.read(1024 * 1024), b""):
            digest.update(chunk)
    return digest.hexdigest()


def main() -> int:
    root = Path(__file__).resolve().parents[1]
    paths = sorted(
        path for path in root.rglob("*")
        if path.is_file()
        and ".git" not in path.parts
        and "__pycache__" not in path.parts
        and path.relative_to(root).as_posix() not in EXCLUDED
    )
    output = root / "metadata/checksums.sha256"
    output.write_text(
        "".join(f"{sha256(path)}  {path.relative_to(root).as_posix()}\n" for path in paths),
        encoding="utf-8",
    )
    print(f"wrote {len(paths)} checksums to {output}")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())