matrix-docker-ansible-deploy/roles/matrix-client-hydrogen/tasks/validate_config.yml

---

- name: Fail if required Hydrogen settings not defined
  fail:
    msg: >
      You need to define a required configuration setting (`{{ item }}`) to use Hydrogen.
  when: "(vars[item] == '' or vars[item] is none) and matrix_client_hydrogen_container_image_self_build|bool"
  with_items:
    - "matrix_client_hydrogen_default_hs_url"