#!/usr/bin/env bash

set -e

workdir=$(mktemp -d)
par=${$}

trap 'rm -rf "${workdir}"' EXIT

# create a lot of directories for testing
mkdir -p "${workdir}"/in/{a,b,c,d,e,f}/{1,2,3,4,5,6}/{a,b,c,d,e,f}/{1,2,3,4,5,6}
# and files
touch "${workdir}"/in/{a,b,c,d,e,f}/{1,2,3,4,5,6}/{a,b,c,d,e,f}/{1,2,3,4,5,6}/{a,b,c,d,e,f}

mkdir "${workdir}"/out

for i in $(seq 1 10); do
	(
		tar -C "${workdir}"/in -c . | tar -x -C "${workdir}"/out
	) &
done

for i in $(seq 1 10); do
	wait
done

diff -dupr "${workdir}"/{in,out}