#!/bin/bash

is_ip6addr_set() {
  local ip6_addr=${1}
  ip address show dev tun0 2> /dev/null | grep -q "${ip6_addr}/"
}

ip6_addr=$(yunohost app setting "vpnclient" "ip6_addr")
if [[ -n "${ip6_addr}" ]] && [[ "${ip6_addr}" != none ]] && is_ip6addr_set "${ip6_addr}"; then
  ip address delete "${ip6_addr}/64" dev tun0
fi