from hashlib import md5

defaults = {
    'backup-client': {
        # unix user names cannot be longer than 32 characters.
        # bundlewrap raises an error if the name is longer than 30 chars.
        'user-name': 'c-' + md5(node.name.encode('UTF-8')).hexdigest()[:28],
    },
}


@metadata_reactor
def cron(metadata):
    if metadata.get('backups/exclude_from_backups', False):
        return {}

    return {
        'cron': {
            'backup': '{} 1 * * *    root    /usr/local/bin/generate-backup > /dev/null'.format(
                (node.magic_number % 60),
            ),
        },
    }