Create chrony-online service

NetworkManager has a dispatcher which may cause the sources to be marked
as disabled. If you don't have any interfaces actually managed with
NetworkManager, we need to have a way to ensure that the sources get
marked enabled on boot. This change adds a chrony-online service that
waits for the network-online.target in order to be able to make chronyd
source online.

Change-Id: Ib1d91852d281c63b2458fc3c0199a5d5fed17056

README.rst

@@ -18,7 +18,7 @@ Role Variables
      - Enable debug option in chrony
    * - `chrony_role_action`
      - `all`
-     - Ansible action when including the role. Should be one of: [all|install|config|upgrade]
+     - Ansible action when including the role. Should be one of: [all|install|config|upgrade|online]
    * - `chrony_package_name`
      - `chrony`
      - chrony system package name

files/chrony-online.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=chronyd online sources service
+After=network-online.target chronyd.service
+Wants=network-online.target chronyd.service
+
+[Service]
+Type=oneshot
+ExecStart=/usr/libexec/chrony-helper command online
+User=root
+
+[Install]
+WantedBy=multi-user.target

tasks/main.yml

@@ -17,3 +17,7 @@
 - name: Configure chronyd
   include_tasks: config.yml
   when: chrony_role_action in ['all', 'config']
+
+- name: Enable online service
+  include_tasks: online.yml
+  when: chrony_role_action in ['all', 'online']

tasks/online.yml

@@ -0,0 +1,14 @@
+---
+- name: Create chrony-online.service unit file
+  become: True
+  copy:
+    src: files/chrony-online.service
+    dest: /etc/systemd/system/chrony-online.service
+
+- name: Enable chrony-online.service
+  become: True
+  systemd:
+    state: started
+    name: chrony-online.service
+    enabled: true
+    daemon-reload: true