Avoid starting the service twice (#123)

Only enable service in the main task and let the handler start it
Skip reloading systemd and enable if unit file did not change

The solution is for systemd only

Fixes #118

Author: ygalblum

tasks/main.yml

@@ -179,22 +179,29 @@
     - not ansible_os_family == "Solaris"
   tags: skip_ansible_lint
 
-- name: systemd script
-  template:
-    src: nomad_systemd.service.j2
-    dest: /lib/systemd/system/nomad.service
-    owner: root
-    group: root
-    mode: 0644
-  when: ansible_service_mgr == "systemd"
-
-- name: reload systemd daemon
-  systemd:
-    daemon_reload: true
+- block:
+    - name: systemd script
+      template:
+        src: nomad_systemd.service.j2
+        dest: /lib/systemd/system/nomad.service
+        owner: root
+        group: root
+        mode: 0644
+      register: nomad_systemd_file
+    - block:
+      - name: reload systemd daemon
+        systemd:
+          daemon_reload: true
+      - name: Enable nomad at startup (systemd)
+        systemd:
+          name: nomad
+          enabled: yes
+      when: nomad_systemd_file.changed
   when: ansible_service_mgr == "systemd"
 
 - name: Start Nomad
   service:
     name: nomad
     enabled: true
     state: started
+  when: not ansible_service_mgr == "systemd"