#!/bin/sh

set -e
set -u

export PATH='/bin:/sbin:/usr/bin:/usr/sbin'

address='130.133.2.1' # ping.fu-berlin.de
max_tries=300
i=0

while [ $i -lt $max_tries ]
do
    if ping -q -n -i 0.2 -c 2 -w 1 "$address" >'/dev/null' 2>&1
    then
        echo "$(hostname) is online."
        exit 0
    fi
    sleep 0.25
    i=$((i + 1))
    test $((i % 20)) -eq 0 && echo "Waiting for $(hostname) to go online."
done
echo >&2 "$(hostname) is offline."
exit 1