matrix-docker-ansible-deploy/roles/custom/matrix-registration/tasks/validate_config.yml

---

- name: Fail if required matrix-registration settings not defined
  ansible.builtin.fail:
    msg: >
      You need to define a required configuration setting (`{{ item.name }}`).      
  when: "item.when | bool and vars[item.name] == ''"
  with_items:
    - {'name': 'matrix_registration_shared_secret', when: true}
    - {'name': 'matrix_registration_admin_secret', when: true}
    - {'name': 'matrix_registration_server_location', when: true}
    - {'name': 'matrix_registration_database_hostname', when: "{{ matrix_registration_database_engine == 'postgres' }}"}

- name: (Deprecation) Catch and report renamed settings
  ansible.builtin.fail:
    msg: >-
      Your configuration contains a variable, which now has a different name.
      Please change your configuration to rename the variable (`{{ item.old }}` -> `{{ item.new }}`).      
  when: "item.old in vars"
  with_items:
    - {'old': 'matrix_registration_docker_repo', 'new': 'matrix_registration_container_image_self_build_repo'}