#!/bin/sh
# Place in /etc/hotplug.d/iface/

[ "$INTERFACE" = "wan6" ] || exit 0

CRON_CMD='0 * * * * kill -SIGUSR1 $(pgrep odhcp6c)'

if [ "$ACTION" = "ifup" ]; then
    grep -Fq "$CRON_CMD" /etc/crontabs/root || {
        echo "$CRON_CMD" >> /etc/crontabs/root
        /etc/init.d/cron restart
    }
elif [ "$ACTION" = "ifdown" ]; then
    sed -i "/$(printf '%b' "$CRON_CMD" | sed 's:[\\/.*^$]:\\&:g')/d" /etc/crontabs/root
    /etc/init.d/cron restart
fi