update ownCloud if necessary

this will always download the latest ownCloud and upgrade if ownCloud install dir exist, this apphroach allows us to keep existing user plugins. currently not checking if currently installed version is equal to the one we're downloading as I couldn't find a proper solution for that

setup/owncloud.sh

@@ -12,16 +12,22 @@ apt_install \
 
 apt-get purge -qq -y owncloud*
 
-# Install ownCloud from source if it is not already present
-# TODO: Check version?
+# Install ownCloud from source
+echo installing ownCloud...
+rm -f /tmp/owncloud.zip
+wget -qO /tmp/owncloud.zip https://download.owncloud.org/community/owncloud-latest.zip
+
 if [ ! -d /usr/local/lib/owncloud ]; then
-	echo installing ownCloud...
-	rm -f /tmp/owncloud.zip
-	wget -qO /tmp/owncloud.zip https://download.owncloud.org/community/owncloud-7.0.1.zip
+	# fresh install
 	unzip -q /tmp/owncloud.zip -d /usr/local/lib
-	rm -f /tmp/owncloud.zip
+else
+	# upgrade existing install
+	unzip -u -o -q /tmp/owncloud.zip -d /usr/local/lib
+	hide_output php /usr/local/lib/owncloud/occ upgrade
 fi
 
+rm -f /tmp/owncloud.zip
+
 # Setup ownCloud if the ownCloud database does not yet exist. Running setup when
 # the database does exist wipes the database and user data.
 if [ ! -f $STORAGE_ROOT/owncloud/owncloud.db ]; then