#!/usr/bin/python3

import sys
import iso9660

if len(sys.argv) < 2:
    print(f"USAGE: {sys.argv[0]} ISOFILE", file=sys.stderr)
    sys.exit(1)

iso = iso9660.ISO9660.IFS(source=sys.argv[1])
if not iso.is_open():
    raise RuntimeError(f"error opening file: {sys.argv[1]}")

label = iso.get_volume_id()
if label is None:
    raise RuntimeError("error reading volume id")

print(f"LABEL = {label}")
sys.exit(0)