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/usr/lib/cnf-update-db is in command-not-found 18.04.4.

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#!/usr/bin/python3

import glob
import logging
import os
import sys

from CommandNotFound.db.creator import DbCreator
from CommandNotFound import CommandNotFound


if __name__ == "__main__":
    if "--debug" in sys.argv[1:]:
        logging.basicConfig(level=logging.DEBUG)
    elif "--verbose" in sys.argv[1:]:
        logging.basicConfig(level=logging.INFO)
    
    db = CommandNotFound.dbpath
    if not os.access(os.path.dirname(db), os.W_OK):
        print("datbase directory %s not writable" % db)
        sys.exit(0)

    command_files = glob.glob("/var/lib/apt/lists/*Commands-*")
    if len(command_files) > 0:
        col = DbCreator(command_files)
        col.create(db)