| |
| """Restore text Parquet assets to their original relative paths, checking hashes.""" |
| import argparse |
| import hashlib |
| from pathlib import Path, PurePosixPath |
| import pyarrow.parquet as pq |
|
|
|
|
| def main(): |
| p = argparse.ArgumentParser() |
| p.add_argument("--dataset-root", type=Path, required=True) |
| p.add_argument("--output", type=Path, required=True) |
| args = p.parse_args() |
| count = 0 |
| for base in ["level1/text", "level1/audio"]: |
| for parquet in sorted((args.dataset_root / base).rglob("*.parquet")): |
| for batch in pq.ParquetFile(parquet).iter_batches(batch_size=4096): |
| for row in batch.to_pylist(): |
| rel = PurePosixPath(row["original_relpath"]) |
| if rel.is_absolute() or ".." in rel.parts: |
| raise ValueError("Unsafe relative path") |
| raw = row["text"].encode("utf-8") |
| assert hashlib.sha256(raw).hexdigest() == row["sha256"] |
| out = args.output / str(rel) |
| |
| if not out.resolve().is_relative_to(args.output.resolve()): |
| raise ValueError("Output path escapes root") |
| out.parent.mkdir(parents=True, exist_ok=True) |
| if out.exists(): |
| if out.read_bytes() != raw: |
| raise FileExistsError(out) |
| else: |
| with out.open("xb") as f: |
| f.write(raw) |
| count += 1 |
| print(f"Restored and verified {count} text files") |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
