def list_system_images(docker_client):
    """Return a list of all images on the current system.

    Args:
        docker_client (docker.client): An already initialized docker client

    Returns:
        list[str]: A list of strings of all image names/tags on the system.
    """
    return [
       image.attrs["RepoTags"][0]
       for image in docker_client.images.list()
       if len(image.attrs["RepoTags"]) > 0
    ]