Ansible Docker Module and JSON

[Mike Albert]

Hi,

I'm running into an issue with how the Ansible Docker module handles JSON data passed in as an environment variable.  I'm currently running Ansible 2.0.2.0.  My docker env variable is defined like this:

dockerhub_auth: {"https://index.docker.io/v1/": {"auth": "foo", "email": "bar" }}

The above var is then referenced like this

  - name: Start ecs-agent container
    docker:
      name: ecs-agent
      image: amazon/amazon-ecs-agent:v{{ ecs_agent_version }}
      state: reloaded  # asserts containers are running and restarts any that have any images or configs out of date.
      pull: always     # the registry will be checked for a newer version of the image' each time the task executes
      detach: true
      restart_policy: on-failure
      restart_policy_retry: 10
      net: bridge
      volumes:
        - /var/run/docker.sock:/var/run/docker.sock
        - /var/log/ecs/:/log  # Z mount option for SELinux available in Ansible 2.1
        - /var/lib/ecs/data:/data
        - /sys/fs/cgroup:/sys/fs/cgroup:ro
        - /var/run/docker/execdriver/native:/var/lib/docker/execdriver/native:ro
      ports:
        - 127.0.0.1:51678:51678
      expose:
        - 51678
      env:
        ECS_LOGFILE: /log/ecs-agent.log
        ECS_LOGLEVEL: info
        ECS_DATADIR: /data
        ECS_CLUSTER: "{{ ecs_cluster }}"
        ECS_ENGINE_AUTH_TYPE: dockercfg
        ECS_ENGINE_AUTH_DATA: "{{ dockerhub_auth | to_json }}"

When I do a debug on "{{ dockerhub_auth | to_json }|" the data shows as properly formatted json.  However, when I run the above task, the variable seems to be passed in with single quotes.  See below:

[root@localhost ~]# docker inspect 3ae5048a8b03|grep ECS_ENGINE_AUTH_DATA
                "ECS_ENGINE_AUTH_DATA={'url': {'email': 'bar', 'auth': 'foo'}}",

Am I encountering a limitation in the Docker module or is there another way I can pass JSON data through to the container?  I saw that the env_file flag for Docker is coming in Ansible 2.1, so that's a possible solution, but I encountered other Docker errors when trying to use the ansible 2.1 devel branch.

Thanks in advance for the help!