Try to make systemd unit handling idempotent

user.yml

@@ -39,7 +39,11 @@
     - "/home/{{ user.name }}/.config/systemd/"
     - "/home/{{ user.name }}/.config/systemd/user/"
 
-- set_fact:
+- name: disable undesired services
+  tags:
+    - undesired-services
+  block:
+    - set_fact:
         undesired_user_services:
           - gpg-agent.socket
           - gpg-agent.sock.service
@@ -49,12 +53,14 @@
           - xdg-user-dirs-update.service
           - gnome-keyring-daemon.service
 
-# systemd needs a login session, machinectl handles that for us
-- name: stop and mask undesired services
+    # systemd needs a login session, machinectl handles that for us
+    - name: stop and mask undesired services
       command:
-    cmd: machinectl --uid {{ user.name }} shell -- .host /usr/bin/env systemctl --user mask --now "{{ item }}"
+        cmd: machinectl --quiet --uid {{ user.name }} shell -- .host /usr/bin/env systemctl --user mask --now "{{ item }}"
       become: true
       become_user: root
+      register: undesired_service_cmd
+      changed_when: undesired_service_cmd.stderr != ""
       loop: "{{ undesired_user_services }}"
 
 - name: create directory for getty autologin