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

---
- name: Fail if required matrix-sliding-sync 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_sliding_sync_hostname', when: true}
    - {'name': 'matrix_sliding_sync_path_prefix', when: true}
    - {'name': 'matrix_sliding_sync_database_hostname', when: true}
    - {'name': 'matrix_sliding_sync_environment_variable_syncv3_server', when: true}
    - {'name': 'matrix_sliding_sync_environment_variable_syncv3_secret', when: true}
    - {'name': 'matrix_sliding_sync_container_network', when: true}
    - {'name': 'matrix_sliding_sync_metrics_proxying_hostname', when: "{{ matrix_sliding_sync_metrics_proxying_enabled }}"}
    - {'name': 'matrix_sliding_sync_metrics_proxying_path_prefix', when: "{{ matrix_sliding_sync_metrics_proxying_enabled }}"}