'Returns the kind and path of all symlinks used in recovery.
:returns: list of (kind, symlink) tuples
:rtype: list'

def _previous_symlinks(self):

    previous_symlinks = []
    for kind in ALL_FOUR:
        link_dir = os.path.dirname(getattr(self, kind))
        link_base = 'previous_{0}.pem'.format(kind)
        previous_symlinks.append((kind, os.path.join(link_dir, link_base)))
    return previous_symlinks
