'Returns full path to which the specified item currently points.
:param str kind: the lineage member item ("cert", "privkey",
"chain", or "fullchain")
:returns: The path to the current version of the specified
member.
:rtype: str or None'

def current_target(self, kind):

    if (kind not in ALL_FOUR):
        raise errors.CertStorageError('unknown    kind    of    item')
    link = getattr(self, kind)
    if (not os.path.exists(link)):
        logger.debug('Expected    symlink    %s    for    %s    does    not    exist.', link, kind)
        return None
    return get_link_target(link)
