#!/usr/bin/env python3
"""Align candidate EVALSHA with the installed Lua bytes actually loaded by the loader."""
import hashlib
from pathlib import Path
import re
import sys
config = Path(sys.argv[1])
script = Path('/etc/opensips/lisglosips_hotpath.lua').read_text()
sha = hashlib.sha1(script.encode()).hexdigest()
text = config.read_text()
matches = re.findall(r'EVALSHA ([0-9a-f]{40}) 1 cfg:active_version', text)
assert len(matches) == 1, 'Unexpected hotpath layout'
config.write_text(text.replace('EVALSHA ' + matches[0], 'EVALSHA ' + sha))
print('Installed hotpath SHA:', sha, 'previous:', matches[0])