#!/bin/bash
LINK="https://karte.{{freifunk.domain}}/data/nodes.zone"

function update_dns {
	mv nodes.zone nodes.alt	
{% for domain in domains %}
	sed -e 's/{{freifunk.domain}}/{{domain}}/g' nodes.alt > db.knoten.{{domain}}
{% endfor %}
	systemctl reload bind9.service	
}

function download_nodes_file {
	wget $LINK
}

cd /etc/bind
download_nodes_file
diff -I 'serial number' nodes.alt nodes.zone
if [[ $? != "0" ]]
then
	update_dns
else
	rm nodes.zone
fi