Get Dockerfile from Docker Image

docker-history.py

# pip install docker

import docker
from sys import argv

cli = docker.APIClient(base_url='unix://var/run/docker.sock')
images = cli.images()

image_id = argv[-1]

commands = []

for i in images:
    if image_id in i['Id']:
        history = cli.history(i['RepoTags'][0])        
        for hist in history:
            commands.append(hist['CreatedBy'])
                        
commands.reverse()

for cmd in commands:
    print(cmd)
    
if not commands:
    print(f"Image not found: {image_id}")