How to check if a role changed something inside a play?

[Richard Megginson]

Is there some way inside of a playbook to see if a role changed something?  The use case is this:

tests_of_my_role.yml:

- name: call role to see if working

  include_role:

    name: my_role

  vars:

    - my role vars

- set_fact:

    __role_changes_before: "{{ _tqm._stats.changes }}"

- name: call role again to see if idempotent

  include_role:

    name: my_role

  vars:

    - my role vars

- assert:

    that: __role_changes_before == _tqm._stats.changes

    msg: Role is not idempotent!

I'm assuming it would be possible to keep track of the changes with a callback plugin, but I'm not sure how the callback would make the "num_of_changes" variable available at the playbook scope.

[Matt Martz]

Not really.  I did a PoC of an action plugin that could do this, but we never really moved forward with it, and I don't know where the code is.

It basically executed the role 2 times from the action plugin, with a custom callback, and then reported whether the role had produced a change.

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Matt Martz
@sivel
sivel.net