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

---
- name: create parent folder for unit files
  ansible.builtin.file:
    dest: ~/.config/systemd/user
    state: directory
  when: systemd_unit_scope == 'user'
  register: _config_dir
- name: 'configure systemd unit {{ systemd_unit_name }}'
  copy:
    dest: '{{ _config_dir_path }}/{{ systemd_unit_name }}'
    content: |
      # ansible managed
      {{ systemd_unit_config }}
    mode: a=r
  vars: &copy_config_file_vars
    _config_dir_path: >-
      {{ _config_dir.path if systemd_unit_scope == 'user'
         else '/etc/systemd/' + (
           "user" if systemd_unit_scope == "global" else systemd_unit_scope
         ) }}
  register: _config_file
  when: systemd_unit_config
- name: 'create parent folder for drop-in config files of systemd unit {{ systemd_unit_name }}'
  file:
    path: '{{ _config_dir_path }}/{{ systemd_unit_name }}.d'
    state: directory
    mode: u=rwx,go=rx
  vars: *copy_config_file_vars
  register: _dropin_config_dir
  when: systemd_unit_dropin_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: '{{ _dropin_config_dir.path }}/{{ systemd_unit_dropin_config_name }}.conf'
    content: |
      # ansible managed
      {{ systemd_unit_dropin_config }}
    mode: a=r
  register: _dropin_config_file
  when: systemd_unit_dropin_config is defined
- name: set return values
  set_fact:
    systemd_unit_config_changed: >-
      {{ _config_file.changed or _dropin_config_file.changed }}
- name: 'fetch state of systemd unit {{ systemd_unit_name }}'
  systemd:
    scope: '{{ systemd_unit_scope }}'
    name: '{{ systemd_unit_name }}'
  register: _unit
  when: systemd_unit_scope in ('system', 'user')
    and (systemd_unit_config_changed or systemd_unit_restart_if_active)
- name: 'set state of systemd unit {{ systemd_unit_name }}'
  systemd:
    scope: '{{ systemd_unit_scope }}'
    daemon_reload: '{{ systemd_unit_config_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 (systemd_unit_config_changed
                            or systemd_unit_restart_if_active)
                         and 'ActiveState' in _unit.status
                         and _unit.status.ActiveState == "active"
         else systemd_unit_state | default(omit) }}
  when: >-
    systemd_unit_scope in ('system', 'user')
    and (systemd_unit_config_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")
    )