AutoPkg build that pipes output to a log file. Build fails if nothing is added to munki.

Jenkins AutoPkg build command

#!/bin/sh
/usr/local/bin/autopkg run -v ${JOB_NAME}.munki MakeCatalogs.munki 2>&1 | tee /Users/Shared/Jenkins/tmp/${JOB_NAME}.log

RESULT=`grep rebuilt /Users/Shared/Jenkins/tmp/${JOB_NAME}.log`
if [ -n "$RESULT" ]; then
    echo "${JOB_NAME} added to Munki repository. Build successful."
    exit 0
else
    echo "Nothing added to munki. Failing the build even though all is well."
    exit 1
fi

I am using job names that are identical to my AutoPkg recipe names, this allows me to use the ${JOB_NAME} variable in Jenkins.