how to best report "changed" for a group of tasks

[Xu Chen]

I wonder if there is a way to report "changed" for a group of tasks..

For example, I want to have a play like this:

- include: sub-play1.yml

- include: sub-play2.yml

  "only when something changed in sub-play1"

Or, a play like this:

- hosts: group1

  tasks:

    - t1

    - t2

- hosts: group2

  tasks: ...

  "only when something changed in either t1 or t2 of the previous tasks"

Maybe I can achieve this by getting access to the internal counter of "changed"? Or maybe there is a better way to do this? Thanks..

[Michael DeHaan]

Are you saying you might to see the change report on a role-by-role basis?

This could be done with a custom callback plugin, but might take a bit of work.

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[Xu Chen]

Yeah, role-by-role is good enough.

Is there a link to such callback concept? Thanks..