Dockerfile-ish output from image (from cwd of a 'docker save' extraction)

gistfile1.txt

#!/usr/bin/python
import json
import sys


img_id = sys.argv[1]
#json_f = open("%s/json" % head)
#img_json = json.load(json_f)
#json_f.close()

traversal_list = [img_id]
while True:
    json_f = open("%s/json" % img_id)
    img_json = json.load(json_f)
    json_f.close()

    parent = img_json.get('parent', None)
    if parent is None:
        break
    traversal_list.append(parent)
    img_id = parent

traversal_list.reverse()
print "Created image hierarchy"
print traversal_list

for img_id in traversal_list:
    json_f = open("%s/json" % img_id)
    img_json = json.load(json_f)
    json_f.close()

    parent = img_json.get('parent', None)
    if parent is None:
        for k, val in img_json['container_config'].iteritems():
            print k, val
        continue

    parent_json_f = open("%s/json" % parent)
    parent_json = json.load(parent_json_f)
    parent_json_f.close()

    for k, val in img_json['container_config'].iteritems():
        if k == "Image":
            continue
        if not k in parent_json.get('container_config', {}):
            print k, val
            continue
        if val != parent_json.get('container_config', {})[k]:
            print k, val
            continue

    img_json = parent_json