Examples

Halfempty Cookbook

This wiki page contains a collection of useful example scripts to help you minimize with halfempty.

Minimizing Timeouts / Hangs

You have found a timeout or hang in your application, and want halfempty to find you the minimal version that still hangs.

To achieve this, you can ask halfempty to send you a SIGALRM using the --timeout parameter, and then handle it in your script.

#!/bin/sh
tempfile=`mktemp` && cat > ${tempfile}

trap 'rm -f ${tempfile}; exit ${result:=1}' EXIT TERM
trap 'rm -f ${tempfile}; exit ${result:=0}' ALRM

yourprogram --yourargs ${tempfile}

Now the following command will find the simplest testcase that takes at least 10 seconds to run:

$ halfempty --timeout 10 timeout.sh testcase