def untag(self, image, tags):
        tags = _ensure_tags(tags)

        self.delete_meta(image, [PROP_TAG + tag for tag in tags])
Returns a list of abbreviated commit hashes unique to ref_name.
dataset/ETHPy150Open openstack/sahara/sahara/utils/openstack/images.py/SaharaImageManager.untag--crossover with--dataset/ETHPy150Open reviewboard/rbtools/rbtools/hooks/git.py/get_unique_commit_hashes