Implemented xvfb install/config for Jenkins role

playbooks/edx_jenkins_tests.yml

@@ -6,6 +6,7 @@
     migrate_db: "yes"
     openid_workaround: True
     ansible_ssh_private_key_file: /var/lib/jenkins/continuous-integration.pem
+    mysql5_workaround: True
   vars_files:
     - "{{ secure_dir }}/vars/edxapp_ref_users.yml"
     - "{{ secure_dir }}/vars/edxapp_sandbox.yml"

playbooks/jenkins.yml

+- name: Configure instance(s)
+  hosts: jenkins
+  sudo: True
+  gather_facts: True
+  vars_files:
+    - "{{ secure_dir }}/vars/edxapp_ref_users.yml"
+    - "{{ secure_dir }}/vars/edxapp_sandbox.yml"
+  roles:
+    - common
+    - edxlocal
+    - jenkins

playbooks/roles/jenkins/handlers/main.yml

+---
+- name: start xvfb
+  sudo: True
+  service: name=xvfb state=started

playbooks/roles/jenkins/tasks/main.yml

+---
+- include: xvfb.yml

playbooks/roles/jenkins/tasks/xvfb.yml

+---
+- name: install xvfb
+  sudo: True
+  apt: pkg=xvfb state=present
+
+- name: configure display
+  sudo: True
+  template: src=xvfb.sh.j2 dest=/etc/profile.d/xvfb.sh owner=root group=root mode=0755
+
+- name: create xvfb upstart script
+  sudo: True
+  template: src=xvfb.conf.j2 dest=/etc/init/xvfb.conf owner=root group=root
+  notify:
+    - start xvfb

playbooks/roles/jenkins/templates/xvfb.conf.j2

+description     "Xvfb X Server"
+start on (net-device-up
+          and local-filesystems
+          and runlevel [2345])
+stop on runlevel [016]
+exec /usr/bin/Xvfb :99 -screen 0 1024x768x24

playbooks/roles/jenkins/templates/xvfb.sh.j2

+# Set the display to the virtual frame buffer (Xvfb)
+export DISPLAY=:99