playbook: add option to enable vifib-kernel role in upgrader

Use vifib-kernel to upgrade debian kernel and distro to a recent version

playbook/roles/upgrader/tasks/main.yml

@@ -58,7 +58,7 @@
       current_upgrade_signature
 
   - name: Do upgrade
-    shell: ansible-playbook {{ upgrader_playbook }} -i hosts 2>>/opt/upgrader/latest_upgrade.log  >> /opt/upgrader/latest_upgrade.log
+    shell: ansible-playbook {{ upgrader_playbook }} --extra-vars "vars_file={{vars_file | default('')}}" -i hosts 2>>/opt/upgrader/latest_upgrade.log  >> /opt/upgrader/latest_upgrade.log
     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-tmp/

playbook/roles/vifib-kernel/tasks/main.yml

@@ -4,6 +4,10 @@
     apt: name=linux-image-4.9.0-5-amd64  state=latest update_cache=yes
     when: ansible_distribution == "Debian" and ansible_distribution_major_version == "9"
 
+  - name: Install Debian jessie-backports repository
+    lineinfile: dest='/etc/apt/sources.list' line='deb http://ftp.debian.org/debian jessie-backports main' state=present
+    when: ansible_distribution == "Debian" and ansible_distribution_major_version == "8"
+
   - name: Install kernel 4.9 on debian 8.0
     apt: name=linux-image-4.9.0-0.bpo.5-amd64  state=latest default_release=jessie-backports update_cache=yes
     when: ansible_distribution == "Debian" and ansible_distribution_major_version == "8"        

playbook/vifib-upgrade.yml

@@ -9,6 +9,11 @@
   vars_files:
     - settings/vifib.yml
 
+  pre_tasks:
+    - name: Load dynamic variables
+      include_vars: "{{vars_file}}"
+      when: vars_file is defined and vars_file != ''
+
   roles:
     - ntp
     - { role: package, package_name: lm-sensors, package_state: latest }
@@ -27,3 +32,5 @@
     - vifib-server
     - rsyslogd
     - sysstat
+    - role: vifib-kernel
+      when: upgrade_kernel | default(False) == True