post-receive.sh

#!/bin/bash

app_path="/path/to/target/folder"

if [ ! -d $app_path ]; then
  mkdir -p $app_path;
fi

while read oldrev newrev ref
do
    if [[ $ref =~ .*/master$ ]];
    then
        echo "Master ref received.  Deploying master branch to production..."
        git --work-tree=$app_path --git-dir=./ checkout -f
        # Put your deployment script here
    else
        echo "Ref $ref successfully received.  Doing nothing: only the master branch may be deployed on this server."
    fi
done