add failure webhook

defaults/main.yml

@@ -26,6 +26,8 @@ restic_ssh_private_key_path: "/root/.ssh/backup"
 restic_systemd_timer_on_calender: "*-*-* 03:00:00"
 restic_systemd_timer_randomized_delay_sec: 0
 
+restic_failure_webhook_url: null
+
 restic_arch_map:
   i386: '386'
   x86_64: 'amd64'

tasks/main.yml

@@ -41,6 +41,14 @@
     restic_folders_combined: "{{ restic_default_folders + restic_folders }}"
   notify: Reload systemd
 
+- name: Add systemd service for restic failure
+  when: restic_failure_webhook_url is not none
+  ansible.builtin.template:
+    src: restic-failure.service.j2
+    dest: /etc/systemd/system/restic-failure.service
+    mode: "0644"
+  notify: Reload systemd
+
 - name: Add systemd timer for restic
   ansible.builtin.template:
     src: restic-backup.timer.j2

templates/restic-backup.service.j2

@@ -1,5 +1,8 @@
 [Unit]
 Description=Restic backup
+{% if restic_failure_webhook_url is not none %}
+OnFailure=restic-failure.service
+{% endif %}
 
 [Service]
 Type=oneshot

templates/restic-failure.service.j2

@@ -0,0 +1,7 @@
+[Unit]
+Description=Restic backup failure
+
+[Service]
+Type=oneshot
+User={{ restic_user }}
+ExecStartPre=/bin/sh -c 'curl -X POST -H "Content-Type: application/json" -d "{\"text\": \"Restic backup service failed on {{ inventory_hostname }}!\"}" {{ restic_failure_webhook_url }}'