prevent config loss

init.sh

@@ -8,7 +8,10 @@ PHY_IF=${WG_HOST_INTERFACE:-$(ip route | awk '/default/ { print $5 }')}
 ADDRESS=${WG_ADDRESS:-10.200.200.1/24}
 
 function shutdown() {
- wg showconf $WG_IF > /etc/wireguard/$WG_IF.conf
+ CONF=$(wg showconf $WG_IF)
+ if [ ! -z "$CONF" ]; then
+  echo "$CONF" > /etc/wireguard/$WG_IF.conf
+ fi
  ip link del dev $WG_IF
  setup_iptables "D"
  killall sleep