'Move a file from src to dst.'

@classmethod
def mv(cls, src, dst, msg, src_storage, dst_storage):

    try:
        if src_storage.exists(src):
            log.info((msg % (src, dst)))
            move_stored_file(src, dst, src_storage=src_storage, dst_storage=dst_storage)
    except UnicodeEncodeError:
        log.error(('Move    Failure:    %s    %s' % (smart_str(src), smart_str(dst))))
