owncloud: Check for database configuration to treat as enabled

- Newer version of owncloud package enable the Apache2 owncloud configuration
  by default.  This happens eventhough database configuraiton is not available.
  Plinth only checks for Apache2 owncloud configuration as enabled to determine
  if owncloud is enabled and hence falsely shows the owncloud is enabled.

- Newer version of owncloud also create a /etc/owncloud/config.php with simple
  instance identifier set.  So merely checking if the files exists is not of
  much use.

- This patch checks if the dbtype variable is configured in config.php or
  autoconfig.php along with Apache2 owncloud configuration to determine if
  owncloud is enabled.

- The same logic is used to determine if autoconfig.php must be generated.

actions/owncloud-setup

@@ -19,13 +19,18 @@
 # See also
 # http://doc.owncloud.org/server/6.0/admin_manual/configuration/configuration_automation.html
 
-if [ -e /etc/apache2/conf-enabled/owncloud.conf ] ; then
-    owncloud_enable=true
+grep -q "^\s*['\"]dbtype['\"]" /etc/owncloud/config.php 2> /dev/null
+db_in_config=$(( ! $? ))
+
+grep -q "^\s*['\"]dbtype['\"]" /etc/owncloud/autoconfig.php 2> /dev/null
+db_in_autoconfig=$(( ! $? ))
+
+if [ -e /etc/apache2/conf-enabled/owncloud.conf ] && \
+       [ $db_in_config -ne 0 -o $db_in_autoconfig -ne 0 ] ; then
+    owncloud_enable_cur=true
 else
-    owncloud_enable=false
+    owncloud_enable_cur=false
 fi
-owncloud_enable_cur=$owncloud_enable
-export owncloud_enable
 
 
 while [ "$1" ] ; do 
@@ -59,7 +64,7 @@ done
 if [ "$owncloud_enable" != "$owncloud_enable_cur" ] ; then
     if $owncloud_enable ; then
 	# Keep existing configuration if it exist
-	if [ ! -e /etc/owncloud/config.php ] ; then
+	if [ $db_in_config -eq 0 -a $db_in_autoconfig -eq 0 ] ; then
 	    # Set up postgresql database and user
 	    dbpwd=$(pwgen -1 30)
 	    su - postgres -c "psql -c \"CREATE USER owncloud WITH NOCREATEDB NOCREATEUSER ENCRYPTED PASSWORD '$dbpwd'\"" \