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wrapper script for running untar with a configurable tar file and then
spitting out csv format values.

#!/bin/sh -x
# 
# Produces a .tar file (if one doesn't exist as $TARFILE), then
# times how long it takes to untar it onto the current directory.
# 
TARFILE=${TARFILE:=/var/tmp/bench.tar}

barf()
{
	echo $@ >2
	exit 1
}

new_tar()
{
	source="/bin /sbin /lib /dev"
	if [ ! -f $1 ]; then
		tar cf $1 $source || barf "tar c failed"
	fi
}

run_tar()
{
	# %U=user %S=system %E=elapsed
	mkdir ./tar || exit 1
	/usr/bin/time -f '%U,%S,%E' tar xf $1 ./tar || exit 1
	rm -fr ./tar || exit 1
}

if [ $# -gt 0 ]; then
	echo "user,system,elapsed"
	exit 0
fi
new_tar $TARFILE
run_tar $TARFILE