r/mosquitto: Support persistence

Mosquitto can save retained messages, persistent clients, etc. to the
filesystem and restore them at startup.  This allows state to be
maintained even after the process restarts.

roles/mosquitto/tasks/main.yml

@@ -5,6 +5,17 @@
   tags:
   - install
 
+- name: ensure mosquitto persistence directory exists
+  file:
+    path: '{{ mosquitto_persistence_location }}'
+    mode: u=rwx,go=
+    owner: mosquitto
+    group: mosquitto
+    state: directory
+  when: mosquitto_persistence_location|d(none) is not none
+  tags:
+  - datadir
+
 - name: ensure mosquitto certificate is installed
   copy:
     src: certs/mosquitto/{{ inventory_hostname }}.cer
@@ -15,6 +26,8 @@
   notify:
   - restart mosquitto
   when: mosquitto_certfile is defined
+  tags:
+  - cert
 - name: ensure mosquitto private key is installed
   copy:
     src: certs/mosquitto/{{ inventory_hostname }}.key
@@ -26,6 +39,8 @@
   notify:
   - restart mosquitto
   when: mosquitto_keyfile is defined
+  tags:
+  - cert
 
 - name: ensure mosquitto is configured
   template:
@@ -34,6 +49,8 @@
     mode: '0644'
   notify:
   - restart mosquitto
+  tags:
+  - mosquitto-config
 
 - meta: flush_handlers
 
@@ -41,7 +58,11 @@
   service:
     name: mosquitto
     enabled: true
+  tags:
+  - service
 - name: ensure mosquitto is running
   service:
     name: mosquitto
     state: started
+  tags:
+  - service