ansible-role-systemd-unit/tasks/main.yml

- name: 'configure systemd unit {{ systemd_unit_name }}'
  copy:
    dest: '/etc/systemd/system/{{ systemd_unit_name }}'
    content: |
      # ansible managed
      {{ systemd_unit_config }}
    mode: a=r
  register: _config_file
  when: systemd_unit_config is defined
- name: 'configure systemd unit {{ systemd_unit_name }} via drop-in config'
  copy:
    # > Along with a unit file foo.service, a "drop-in" directory foo.service.d/ may
    # > exist. All files with the suffix ".conf" from this directory will be parsed
    # > after the unit file itself is parsed.
    dest: '/etc/systemd/system/{{ systemd_unit_name }}.d/override.conf'
    content: |
      # ansible managed
      {{ systemd_unit_dropin_config }}
    mode: a=r
  register: _dropin_config_file
  when: systemd_unit_dropin_config is defined
- name: 'fetch state of systemd unit {{ systemd_unit_name }}'
  systemd:
    name: '{{ systemd_unit_name }}'
  register: _unit
  when: _config_file.changed or _dropin_config_file.changed or systemd_unit_restart_if_active
- name: 'set state of systemd unit {{ systemd_unit_name }}'
  systemd:
    daemon_reload: '{{ _config_file.changed or _dropin_config_file.changed }}'
    name: '{{ systemd_unit_name }}'
    enabled: '{{ systemd_unit_enabled | default(omit) }}'
    # > `started'/`stopped' are idempotent actions [...]
    # > `restarted' will always bounce the service
    state: >-
      {{ "restarted" if (systemd_unit_state is not defined
                            or systemd_unit_state != "stopped")
                         and (_config_file.changed
                            or _dropin_config_file.changed
                            or systemd_unit_restart_if_active)
                         and 'ActiveState' in _unit.status
                         and _unit.status.ActiveState == "active"
         else systemd_unit_state | default(omit) }}
  when: >-
    _config_file.changed
    or _dropin_config_file.changed
    or systemd_unit_enabled is defined
    or systemd_unit_state is defined
    or (systemd_unit_restart_if_active
        and 'ActiveState' in _unit.status
        and _unit.status.ActiveState == "active")