new file: roles/host_maintenance/README.md

modified:   roles/host_maintenance/tasks/systemd_mount.yaml
modified:   roles/host_maintenance/templates/systemd_mount.j2

roles/host_maintenance/tasks/systemd_mount.yaml

@@ -1,7 +1,11 @@
-#vars:
-#  host_maintenance_systemd_mount_target: ""
-#  host_maintenance_systemd_mount_source: ""
+- ansible.builtin.assert:
+    that:
+      - item.source is defined
+      - item.target is defined
+      - item.mount_type is defined
+    fail_msg: "All of source, target, and mount_type must be defined for each disk entry."
 
+  loop: "{{ host_maintenance_disk_mounts }}"
 - name: check target folders
   ansible.builtin.file:
     path: "{{ item.target }}"