TIMESYNCD_CONF=/run/systemd/timesyncd.conf.d/01-dhclient6.conf

timesyncd_servers_setup_remove() {
        if [ -e $TIMESYNCD_CONF ]; then
            rm -f $TIMESYNCD_CONF
            systemctl try-restart systemd-timesyncd.service || true
        fi
}

timesyncd_servers_setup_add() {
        if [ ! -d /run/systemd/system ]; then
                return
        fi

        if [ -e $TIMESYNCD_CONF ] && [ "$new_dhcp6_sntp_servers" = "$old_dhcp6_sntp_servers" ]; then
                return
        fi

        if [ -z "$new_dhcp6_sntp_servers" ]; then
                timesyncd_servers_setup_remove
                return
        fi

        mkdir -p $(dirname $TIMESYNCD_CONF)
        cat <<EOF > ${TIMESYNCD_CONF}.new
# NTP server entries received from DHCP server
[Time]
NTP=$new_dhcp6_sntp_servers
EOF
        mv ${TIMESYNCD_CONF}.new ${TIMESYNCD_CONF}
        systemctl try-restart systemd-timesyncd.service || true
}


case $reason in
        BOUND|BOUND6|RENEW|RENEW6|REBIND|REBIND6|REBOOT|REBOOT6)
                timesyncd_servers_setup_add
                ;;
        EXPIRE|EXPIRE6|FAIL|FAIL6|RELEASE|RELEASE6|STOP|STOP6)
                timesyncd_servers_setup_remove
                ;;
esac