Returns the last created baseline snapshot marked with `tag`

def _get_baseline_from_tag(config, tag):
    '''
    Returns the last created baseline snapshot marked with `tag`
    '''
    last_snapshot = None
    for snapshot in __salt__['snapper.list_snapshots'](config):
        if tag == snapshot['userdata'].get("baseline_tag"):
            if not last_snapshot or last_snapshot['timestamp'] < snapshot['timestamp']:
                last_snapshot = snapshot
    return last_snapshot