My hook

post-receive

#!/bin/bash
while read oldrev newrev ref
do
    echo "new: $newrev"
    git show --pretty=format:"The author of %h was %an, %ar%nThe title was >>%s<<%n"
    if [[ $ref =~ .*/master$ ]];
    then
        echo "Master $ref received.  Deploying master branch to production..."
        GIT_WORK_TREE=~/tap git checkout -f
        echo "$?"
    else
        echo "Ref $ref successfully received.  Doing nothing: only the master branch may be deployed on this server."
    fi
done