Extract a docker image retrieved with docker_pull.py (https://github.com/NotGlop/docker-drag)

docker_extract.py

# Extract a docker image retrieved with docker_pull.py (https://github.com/NotGlop/docker-drag)
import tarfile 
import sys, json

# The tar contains a manifest.json which lists layers; each layer is a tar archive
with tarfile.TarFile(sys.argv[1]) as tf:
    with tf.extractfile("manifest.json") as manifest_fp:
        manifest = json.loads(manifest_fp.read())
        for layername in manifest[0]['Layers']:
            with tf.extractfile(layername) as layer_fp:
                with tarfile.TarFile(fileobj=layer_fp) as layer_tar:
                    for member in layer_tar.getmembers():
                        if not member.isdev():
                            print(member.name)
                            layer_tar.extract(member)