Add support for enabling/disabling the Ubuntu theme

config.yaml

@@ -74,3 +74,7 @@ options:
         type: string
         default: "no"
         description: Show Django debug messages.
+    ubuntu-theme:
+        type: string
+        default: "yes"
+        description: Use Ubuntu theme for the dashboard.

hooks/horizon-common

@@ -3,7 +3,7 @@
 
 CHARM="openstack-dashboard"
 
-PACKAGES="openstack-dashboard openstack-dashboard-ubuntu-theme python-keystoneclient python-memcache memcached haproxy"
+PACKAGES="openstack-dashboard python-keystoneclient python-memcache memcached haproxy"
 LOCAL_SETTINGS="/etc/openstack-dashboard/local_settings.py"
 
 if [[ -e "$CHARM_DIR/lib/openstack-common" ]] ; then

hooks/horizon-relations

@@ -120,6 +120,12 @@ function config_changed {
     set_or_update DEBUG True
   fi
 
+  if [ "$(config-get ubuntu-theme)" != "yes" ]; then
+    apt-get purge openstack-dashboard-ubuntu-theme || :
+  else
+    apt-get install openstack-dashboard-ubuntu-theme
+  fi
+
   # Reconfigure Apache Ports
   configure_apache "80:70" "443:433"
   service apache2 restart