playbook: Introduce timebased upgrade schedule

Now 'upgrader' should do also date comparation.

playbook/roles/upgrader/tasks/main.yml

 ---
+  - stat: path=/opt/upgrader/last-upgrade
+    register: last_upgrade
+
+  - shell: echo 1 > /opt/upgrader/last-upgrade
+    when: last_upgrade.stat.exists == False
+
   - file: path=/opt/upgrader/ state=directory mode=0755
 
   - shell: rm -rf /opt/upgrader/playbook/
@@ -34,13 +40,16 @@
 
   - name: Do upgrade
     shell: ansible-playbook {{ upgrader_playbook }} -i hosts >> /opt/upgrader/latest_upgrade.log 
-    when: lookup('file', '/opt/upgrader/next-upgrade-signature') != lookup('file', '/opt/upgrader/current-upgrade-signature')
+    when: (upgrade_after > lookup('file', '/opt/upgrader/last-upgrade')|int ) and (lookup('file', '/opt/upgrader/next-upgrade-signature') != lookup('file', '/opt/upgrader/current-upgrade-signature'))
     args:
       chdir: /opt/upgrader/playbook/
 
   - name: Upgrade Current Upgrade Signature
     shell: cat /opt/upgrader/next-upgrade-signature > /opt/upgrader/current-upgrade-signature 
-    when: lookup('file', '/opt/upgrader/next-upgrade-signature') != lookup('file', '/opt/upgrader/current-upgrade-signature')
+    when: (upgrade_after > lookup('file', '/opt/upgrader/last-upgrade')|int ) and (lookup('file', '/opt/upgrader/next-upgrade-signature') != lookup('file', '/opt/upgrader/current-upgrade-signature'))
+
+  - shell: echo {{ ansible_date_time.epoch }} > /opt/upgrader/last-upgrade
+    when: (upgrade_after > lookup('file', '/opt/upgrader/last-upgrade')|int ) and (lookup('file', '/opt/upgrader/next-upgrade-signature') != lookup('file', '/opt/upgrader/current-upgrade-signature'))
 
   - name: Set Cron  
     cron: name="Launch Upgrader" minute="0" hour="*/3" job='ansible-playbook upgrader-run.yml --with-vars "upgrader-playbook={{ upgrader_playbook }}" -i hosts >> /opt/upgrader/latest_upgrade.log' 

playbook/settings/upgrader.yml

+---
+upgrade_after: 1434474611

playbook/upgrader-run.yml

@@ -2,6 +2,9 @@
   hosts: 127.0.0.1
   connection: local
 
+  vars_files:
+    - settings/upgrader.yml
+
   roles:
     - upgrader
 

playbook/vifib.yml

@@ -7,6 +7,7 @@
 
   vars_files:
     - settings/vifib.yml
+    - settings/upgrader.yml
 
   vars_prompt:
     - name: "computer_name"