#!/usr/bin/env python3
"""Check core.tar.xz against its digest and unpack it into a directory: extract.py DIR."""
import hashlib, pathlib, sys, tarfile

SHA256 = "78bb8ad1bc9523ca3b76b0c86baa374140dd508eeae4fa7f34c180c2480a683f"
archive = pathlib.Path(__file__).with_name("core.tar.xz")
digest = hashlib.sha256(archive.read_bytes()).hexdigest()
if digest != SHA256:
    sys.exit(f"extract.py: core.tar.xz is {digest}, not {SHA256}")
with tarfile.open(archive) as tar:
    tar.extractall(sys.argv[1], filter="data")