def head_object(self, cont, obj):
        pass
In case of v2 format, layer id's are not the same as the id's
dataset/ETHPy150Open saltstack/salt/salt/utils/openstack/swift.py/SaltSwift.head_object--crossover with--dataset/ETHPy150Open goldmann/docker-squash/docker_squash/v2_image.py/V2Image._read_layer_paths