Decision on how to handle fact gathering in a role about automation-good-practices HOT 3 OPEN

Section 3.1.9.1. Platform specific variables seems to cover this topic.

But I have some trouble following the example given there. I don't understand where and how to define a list of required facts for __rolename_required_facts. So my playbook fails with the error '__rolename_required_facts' is undefined.

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Section 3.1.9.1. Platform specific variables seems to cover this topic.

But I have some trouble following the example given there. I don't understand where and how to define a list of required facts for __rolename_required_facts. So my playbook fails with the error '__rolename_required_facts' is undefined.

These are typically defined in vars/main.yml - most of the system roles use this e.g. https://github.com/linux-system-roles/storage/blob/master/vars/main.yml - in some cases where the role was not using vars/ the facts are defined in defaults/main.yml - https://github.com/linux-system-roles/network/blob/main/defaults/main.yml#L125 - as long as they are defined by the time ansible executes tasks/main.yml of the role.

Do you have a use case where you need to use ANSIBLE_GATHERING=explicit or gather_facts: false in your playbooks?

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