Loading multiple docker images saved with image IDs returns empty list

Environment:

• Docker server version: 18.09.7-ce
• docker-py version: 4.0.2

To reproduce the problem, run the following code:

import subprocess

import docker


def main():
    docker_client = docker.from_env(version='auto')
    image_names = ['debian', 'ubuntu']  # Replace this with any of your Docker image names.
    image_ids = [docker_client.images.get(image_name).id for image_name in image_names]

    with subprocess.Popen(['docker', 'save', *image_ids], stdout=subprocess.PIPE) as docker_save_process:
        print(docker_client.images.load(docker_save_process.stdout))


if __name__ == '__main__':
    main()

I expect a list of multiple images being printed, but instead an empty list is printed.

I did a little digging, it seems that in the following code:

https://github.com/docker/docker-py/blob/17c86429e454e65f74660393ffb427adb8db154a/docker/models/images.py#L383-L393

chunk contains multiple lines of loaded image info that makes the regular expression match fail.

Start in docker/models/images.py around lines 383-393 and reproduce the issue with the provided Python example using multiple image IDs. Check how the loaded image information is parsed when docker save emits multiple lines; done means docker_client.images.load returns all loaded images instead of an empty list.