[ansible-project] docker_login works in playbook, but not in role?

[Bjørn Hansen]

I'm trying to use a private docker registry, and seeing some weirdness that 
I can't explain.  Running the exact same task yaml is working as expected 
when I put it in a playbook and run it, but not working when running as 
part of a role (the task runs, but comes back with status "changed": false

Here's my playbook, which works:
- name: docker login test
  hosts: myhost-02
  tasks:
  - name: log in to my docker registry
    docker_login:
      registry: hoylu.azurecr.io
      username: hoylu
      password: MyPassword

and here's what I have under roles/dockerhost/tasks:
---
- name: reset ssh connection to allow user changes to affect 'current login 
user' 
  meta: reset_connection

- name: log in to my docker registry
  docker_login:
    registry: hoylu.azurecr.io
    username: hoylu
    password: MyPassword


in the playbook case (first example), this results in the ~/.docker/config.json 
file being created on the host and it being logged in to the registry:
changed: [myhost-02] => {
    "changed": true,
    "invocation": {
        "module_args": {
            "api_version": null,
            "cacert_path": null,
            "cert_path": null,
            "config_path": "~/.docker/config.json",
            "debug": false,
            "docker_host": null,
            "email": null,
            "filter_logger": false,
            "key_path": null,
            "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "reauthorize": false,
            "registry": "hoylu.azurecr.io",
            "registry_url": "hoylu.azurecr.io",
            "ssl_version": null,
            "state": "present",
            "timeout": null,
            "tls": null,
            "tls_hostname": null,
            "tls_verify": null,
            "username": "hoylu"
        }
    },
    "login_result": {
        "IdentityToken": "",
        "Status": "Login Succeeded"
    }

but in the second case (after deleting the ~/.docker folder on the host to 
make sure it's not already logged in) I get:
ok: [myhost-02] => {
    "changed": false,
    "invocation": {
        "module_args": {
            "api_version": null,
            "cacert_path": null,
            "cert_path": null,
            "config_path": "~/.docker/config.json",
            "debug": false,
            "docker_host": null,
            "email": null,
            "filter_logger": false,
            "key_path": null,
            "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
            "reauthorize": false,
            "registry": "hoylu.azurecr.io",
            "registry_url": "hoylu.azurecr.io",
            "ssl_version": null,
            "state": "present",
            "timeout": null,
            "tls": null,
            "tls_hostname": null,
            "tls_verify": null,
            "username": "hoylu"
        }
    },
    "login_result": {
        "email": null,
        "password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
        "serveraddress": "hoylu.azurecr.io",
        "username": "hoylu"
    }

highlights show the only difference, but I don't understand why I might be 
seeing different behavior here, or how to troubleshoot it.

Thanks,
Bjørn

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