#!/bin/bash

export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"

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 add "${ip6_addr}/64" dev tun0
fi