git pre-receive hook to run a command with the newest ref on the master branch

pre-receive

#!/bin/bash
while read oldrev newrev ref
do
    if [[ $ref =~ .*/master$ ]];
    then
        echo $oldrev $newrev $ref
        echo $PWD
        set -x
        set -e
        mkdir /tmp/$newrev
        git archive $newrev | tar -x -C /tmp/$newrev
        find /tmp/$newrev
        cat /tmp/$newrev/foo
    fi
done