#!/bin/sh

current_process=$$
tries=3
some_time=5

kill_child_processes() {
    for dir in /proc/[0-9]*; do
        process_id=$(cat ${dir}/stat | awk '{print $4}')
        child_id=$(cat ${dir}/stat | awk '{print $1}')
        if [ ${process_id} -eq $1 ]; then
            kill -9 ${child_id}
        fi
    done
}

trap "kill_child_processes ${current_process} ; kill -9 ${current_process}" SIGTERM SIGINT SIGHUP

while [ $tries -ge 1 ]
do
    if ! ping -q -c 1 10.0.22.1 > /dev/null ; then
        until ntpd -n -q -p $(nslookup tik.cesnet.cz 1.1.1.1 | grep 'Address' | tail -1 | cut -d ' ' -f 2)
        do
            rc-service wg-quick.wg0 stop
            logger -t ntp_sync "Trying to sync time..."
            sleep $some_time &
            wait $!
        done
        rc-service wg-quick.wg0 status | grep "started" || rc-service wg-quick.wg0 start
        sleep $some_time &
        wait $!
    fi
    sleep $some_time &
    wait $!
    tries=$(( $tries - 1 ))
done
exit 0