matrix/roles/synapse/tasks/check.yml

---
- name: Ensure synapse_state is valid
  ansible.builtin.fail:
    msg: "State '{{ synapse_state }}' is not known, supported states are {{ synapse_states | join(', ') }}"
  when: synapse_state not in synapse_states

- name: Ensure synapse deployment method is supported
  ansible.builtin.fail:
    msg: >-
      Deployment method '{{ synapse_deployment_method }}'
      is unknown! Supported methods are:
      {{ synapse_deployment_methods | join(', ') }}
  when: synapse_deployment_method not in synapse_deployment_methods

- name: Ensure required variables are given
  ansible.builtin.fail:
    msg: "Required variable '{{ item }}' is undefined!"
  loop: "{{ synapse_required_variables }}"
  when: >-2
    item not in hostvars[inventory_hostname]
    or hostvars[inventory_hostname][item] | length == 0

- name: Ensure conditionally required variables are given
  ansible.builtin.fail:
    msg: "Required variable '{{ item.name }}' is undefined!"
  loop: "{{ synapse_conditionally_required_variables }}"
  loop_control:
    label: "{{ item.name }}"
  when: >-2
    item.when
    and (item.name not in hostvars[ansible_host]
        or hostvars[ansible_host][item.name] | length == 0)