Salt: Pillar salt events on changes

[mfilotto]

Would be nice to have events to watch for pillar changes.

My use case is the following:
I dynamically manage my nodes with "roles" I give them through their pillar as follow :

[root@dbk-mastery-01v srv]$ cat pillar/nodes/init.sls
{% include 'nodes/' + salt['grains.get']('host') + '.sls' ignore missing %}

[root@dbk-mastery-01v srv]$ cat pillar/nodes/dbk-miniont-01v.sls
roles:
  - swarm.manager



md5-33e4788f3ae5edb7bcf204c27ebb5666



[root@dbk-mastery-01v srv]$ cat salt/roles/init.sls
{% if 'roles' in pillar %}
include:
{% for role in salt['pillar.get']('roles', []) %}
  - {{ role }}
{% endfor %}
{% endif %}

This works nicely, but it would be even better if I can apply the absent state (state that removes what init state did) when I remove an entry in pillar roles list.

[mirceaulinic]

@mfilotto did you have a look at this beacon: https://docs.saltstack.com/en/latest/ref/beacons/all/salt.beacons.inotify.html? You can configure it to push events on the bus when a file is changed. You could monitor dbk-miniont-01v.sls etc. and using a reactor you can execute the necessary state. Is this suitable for your case?

[Ch3LL]

@mfilotto did you see @mirceaulinic 's suggestion. Does that work for our use case?

[mfilotto]

@mirceaulinic : Does the inotify event contain the diff or new and old file versions for me to compare and trigger my absent state ?

[mirceaulinic]

Not what I'm aware of @mfilotto.

[mfilotto]

Could adding pillar change events be considered ?

[mirceaulinic]

That would be a very nice feature indeed. +1

[Ch3LL]

Will approve as a feature request. Thanks!

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