| |
| |
| """Verify a downloaded CASID release against release_file_hashes.csv. |
| |
| Checks, for every row in the manifest: |
| 1. the file exists |
| 2. its size matches |
| 3. its MD5 matches (full read) |
| |
| Usage: |
| python verify_download.py --root CASID-dataset [--workers 8] |
| """ |
| import argparse |
| import csv |
| import hashlib |
| import os |
| import sys |
| from multiprocessing import Pool |
|
|
| CHUNK = 1 << 20 |
|
|
|
|
| def check(task): |
| root, rel, size, md5 = task |
| path = os.path.join(root, rel) |
| if not os.path.isfile(path): |
| return rel, "MISSING" |
| if os.path.getsize(path) != int(size): |
| return rel, "SIZE_MISMATCH" |
| h = hashlib.md5() |
| try: |
| with open(path, "rb") as f: |
| for chunk in iter(lambda: f.read(CHUNK), b""): |
| h.update(chunk) |
| except OSError as e: |
| return rel, "READ_ERROR(%s)" % e |
| return rel, "OK" if h.hexdigest() == md5 else "MD5_MISMATCH" |
|
|
|
|
| def main(): |
| ap = argparse.ArgumentParser() |
| ap.add_argument("--root", required=True, help="downloaded dataset root") |
| ap.add_argument("--workers", type=int, default=8) |
| args = ap.parse_args() |
|
|
| manifest = os.path.join(args.root, "release_file_hashes.csv") |
| if not os.path.isfile(manifest): |
| sys.exit("ERROR: %s not found (download incomplete?)" % manifest) |
|
|
| tasks = [] |
| with open(manifest) as f: |
| for row in csv.reader(f): |
| if row and row[0] != "path": |
| tasks.append((args.root, row[0], row[1], row[2])) |
| print("verifying %d files ..." % len(tasks)) |
|
|
| n_ok = n_bad = 0 |
| bad = [] |
| with Pool(args.workers) as pool: |
| for rel, status in pool.imap_unordered(check, tasks, chunksize=8): |
| if status == "OK": |
| n_ok += 1 |
| else: |
| n_bad += 1 |
| bad.append((rel, status)) |
| if (n_ok + n_bad) % 500 == 0: |
| print(" %d/%d" % (n_ok + n_bad, len(tasks)), flush=True) |
|
|
| print("RESULT: %d OK, %d bad (total %d)" % (n_ok, n_bad, len(tasks))) |
| for rel, status in bad[:20]: |
| print(" %s: %s" % (status, rel)) |
| if n_bad: |
| sys.exit(1) |
| print("ALL FILES VERIFIED ✔") |
|
|
|
|
| if __name__ == "__main__": |
| main() |
|
|
