#!/bin/sh

rm -f a b
dd if=/dev/zero of=a bs=2M count=100

(while :; do ln -f a b; done) &
pidOfLoop=$!

tar cvvf - a >/dev/null
retValOfTar=$?
kill -9 $pidOfLoop
wait

if [[ $retValOfTar -eq 0 ]]; then
	echo OK
else
	echo FAIL
fi