change to script user: zfs_health (#253)

Co-authored-by: Michael Grote <michael.grote@posteo.de>
Reviewed-on: mg/ansible#253
Co-authored-by: mg <michael.grote@posteo.de>
Co-committed-by: mg <michael.grote@posteo.de>

roles/mgrote.zfs_health/defaults/main.yml

@@ -1,3 +1,7 @@
 ---
+  ### when should the script be run
   zfs_extra_cron_minutes_zfs_health: "0,15,30,45"
   zfs_extra_cron_hours_zfs_health: "*"
+  ### under which user the script is run
+  zfs_health_user_group: "root"
+  zfs_health_user: "zfs-health"

roles/mgrote.zfs_health/tasks/main.yml

@@ -1,16 +1,22 @@
 ---
-  - name: copy "zfs-health.sh"
+  - name: include user tasks
+    include_tasks: user.yml
+
+  - name: template script
     become: yes
     ansible.builtin.template:
       src: zfs-health.sh
       dest: /usr/local/bin/zfs-health.sh
-      mode: "+x"
+      mode: 0744
+      owner: "{{ zfs_health_user }}"
+      group: "{{ zfs_health_user_group }}"
 
-  - name: add cronjob "zfs-health.sh"
+  - name: ensure cronjob exists
     become: yes
     ansible.builtin.cron:
-      name: zfs-health
+      name: zfs_health
       state: present
       job: "/usr/local/bin/zfs-health.sh"
       minute: "{{ zfs_extra_cron_minutes_zfs_health }}"
       hour: "{{ zfs_extra_cron_hours_zfs_health }}"
+      user: "{{ zfs_health_user }}"

roles/mgrote.zfs_health/tasks/user.yml

@@ -0,0 +1,18 @@
+---
+  - name: ensure group exists
+    become: true
+    ansible.builtin.group:
+      name: "{{ zfs_health_user_group }}"
+      state: present
+    when:
+      - zfs_health_user_group is defined
+
+  - name: ensure user exists
+    become: true
+    ansible.builtin.user:
+      name: "{{ zfs_health_user }}"
+      group: "{{ zfs_health_user_group }}"
+      shell: /usr/sbin/nologin
+    when:
+      - zfs_health_user_group is defined
+      - zfs_health_user is defined