add systemd timer for backups

defaults/main.yml

 backups:
+  jobs:
+    retention:
+      enabled: true
+      OnCalendar: "1:{{ 60|random(seed=(inventory_hostname + 'backups_jobs')) }}"
+    run:
+      enabled: true
+      OnCalendar: "3,11,19:{{ 60|random(seed=(inventory_hostname + 'backups_jobs')) }}"
+    check:
+      enabled: true
+      OnCalendar: "monday 5:{{ 60|random(seed=(inventory_hostname + 'backups_jobs')) }}"
   backends:
     restic:
       url: /var/backup-client/restic

handlers/main.yml

 - name: reload systemd
   systemd:
     daemon_reload: True
+
+- name: enable timers
+  loop:
+    - check
+    - retention
+    - run
+  systemd:
+    name: "backup-{{ item }}.timer"
+    enabled: "{{ backups.jobs[item].enabled }}"
+    state: "{% if backups.jobs[item].enabled %}started{% else %}stopped{% endif %}"

tasks/main.yml

@@ -48,6 +48,7 @@
       - backup-full
       - backup-cronjob
       - backup-check
+      - status-email-root
     template:
       src: "{{ item }}.j2"
       dest: "/usr/local/bin/{{ item }}"
@@ -62,12 +63,28 @@
       - backup-check
       - backup-retention
       - backup-run
+      - status-email-root@
     template:
       src: "{{ item }}.service.j2"
       dest: "/etc/systemd/system/{{ item }}.service"
       owner: root
       group: root
       mode: 0644
+#      validate: /usr/bin/systemd-analyze verify %s
+  - name: copy timers
+    notify:
+      - reload systemd
+      - enable timers
+    loop:
+      - check
+      - retention
+      - run
+    template:
+      src: "timer.j2"
+      dest: "/etc/systemd/system/backup-{{ item }}.timer"
+      owner: root
+      group: root
+      mode: 0644
 #      validate: /usr/bin/systemd-analyze verify %s
   - name: create data folder
     file:

templates/status-email-root.j2

+#!/bin/bash
+set -euo pipefail
+
+systemctl status "$1" | mail -s "service $1 failed on $( hostname )" root || true

templates/status-email-root@.service.j2

+[Unit]
+Description=Send a mail to root in case of a service failure
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/bin/status-email-root %i
+

templates/timer.j2

+[Unit]
+Description=Execute backup job
+
+[Timer]
+Persistent=true
+{% if "OnCalendar" in backups.jobs[item] %}
+OnCalendar={{ backups.jobs[item].OnCalendar }}
+{% endif %}
+
+[Install]
+WantedBy=timers.target