Merge pull request #990 from pi-hole/dontkillsetupVars.conf

Don't kill setupVars.conf on update/fresh install

automated install/basic-install.sh

@@ -872,9 +872,9 @@ configureFirewall() {
 }
 
 finalExports() {
-	#If it already exists, lets overwrite it with the new values.
-	if [[ -f ${setupVars} ]]; then
-		rm ${setupVars}
+	# Update variables in setupVars.conf file
+	if [ -e "${setupVars}" ]; then
+		sed -i.update.bak '/PIHOLE_INTERFACE/d;/IPV4_ADDRESS/d;/IPV6_ADDRESS/d;/PIHOLE_DNS_1/d;/PIHOLE_DNS_2/d;/QUERY_LOGGING/d;' "${setupVars}"
 	fi
     {
 	echo "PIHOLE_INTERFACE=${PIHOLE_INTERFACE}"