"""Verify every downloaded cache file against its original SHA-256."""
from pathlib import Path
import argparse, hashlib, json
EXPECTED = "281e4e8672ea7a47bb1e569e1e0c435b59a331be1352a1604b292a924ca2fe59"
def digest(path):
    h = hashlib.sha256()
    with path.open("rb") as f:
        for block in iter(lambda: f.read(8 * 1024**2), b""): h.update(block)
    return h.hexdigest()
def verify(cache):
    cache = Path(cache).resolve()
    if digest(cache / "manifest.json") != EXPECTED: raise ValueError("Unexpected manifest")
    manifest = json.loads((cache / "manifest.json").read_text())
    for row in manifest["frames"]:
        path = (cache / row["path"]).resolve()
        if not path.is_relative_to(cache): raise ValueError("Unsafe manifest path")
        if digest(path) != row["sha256"]: raise ValueError(f"Hash mismatch: {row['path']}")
    print(f"PASS: {len(manifest['frames'])} files match the original frozen cache.")
if __name__ == "__main__":
    p=argparse.ArgumentParser(); p.add_argument("--cache",type=Path,default=Path(__file__).resolve().parent/"frozen_depth")
    verify(p.parse_args().cache)