Refactor systemd handling

- sys-ctl-rpr-btrfs-balancer: suppress service flush for btrfs balancer (too expensive to run each play)
- sys-daemon: replace raw systemctl calls with ansible.builtin.systemd (daemon_reload, daemon_reexec)
- sys-service: split handler into 'Enable systemctl service' and 'Set systemctl service state', add become, async/poll, suppress flush guard

Conversation: https://chatgpt.com/share/68c2f7a6-6fe4-800f-9d79-3e3b0ab4a563

roles/sys-ctl-rpr-btrfs-balancer/tasks/01_core.yml

@@ -12,6 +12,7 @@
 - include_role:
     name: sys-service
   vars:
+    system_service_suppress_flush:  true # It takes a super long time - Better wait for failure of timed service instead of executing it on every play
     system_service_copy_files:      false
     system_service_on_calendar:     "{{ SYS_SCHEDULE_REPAIR_BTRFS_AUTO_BALANCER }}"
     system_service_timer_enabled:   true

roles/sys-daemon/handlers/main.yml

@@ -35,14 +35,19 @@
     - reexec systemd manager
 
 - name: reload system daemon
-  command: systemctl daemon-reload
+  ansible.builtin.systemd:
+    daemon_reload: true
   become: true
-  listen: reload system daemon
+  listen:
+    - reload system daemon
+    - refresh systemctl service
   async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
   poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
 
 - name: reexec systemd manager
-  command: systemctl daemon-reexec
+  # Just execute this during reset, it has potential dangerous side effects
+  ansible.builtin.systemd:
+    daemon_reexec: true
   become: true
   listen: reexec systemd manager
   async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"

roles/sys-service/handlers/main.yml

@@ -1,9 +1,19 @@
-- name: "refresh systemctl service"
+- name: "Enable systemctl service"
   systemd:
     name: "{{ system_service_id | get_service_name(SOFTWARE_NAME) }}"
-    daemon_reload: yes
     enabled: yes
+    daemon_reload: true
+  become: true
+  async:  "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:   "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
+  listen: refresh systemctl service
+
+- name: "Set systemctl service state"
+  systemd:
+    name: "{{ system_service_id | get_service_name(SOFTWARE_NAME) }}"
     state: "{{ system_service_state }}"
+  become: true
   async:  "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
   poll:   "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"
   when:   not (system_service_suppress_flush | bool)
+  listen: refresh systemctl service