post-receive git hook

#create hook script: /path/to/git/bare/repo/post-receive

#!/bin/bash
while read oldrev newrev ref
do
    if [[ $ref =~ .*/master$ ]];
    then
        echo "pulling master"
        git --work-tree=/path/to/working/dir --git-dir=/path/to/working/dir/.git pull origin master
    else
        echo "Ref $ref successfully received.  Doing nothing: only the master branch may be deployed on this server."
    fi
done

# then run this to make it executable
chmod +x post-receive