Git auto update hook for web deployment

git_deploy.sh

echo "Enter an existing repository name:"
read REPONAME
cd /home/git/repositories/$REPONAME.git

echo "Configuring bare git repo..."
git --bare update-server-info
git config core.bare false
git config receive.denycurrentbranch ignore
git config core.worktree /var/www/$REPONAME
mkdir /var/www/$REPONAME
chown git:git /var/www/$REPONAME

echo "Working out the hook"
cat >> hooks/post-receive <<-"EOA"
#!/bin/sh
read oldrev newrev ref
BRANCH=`echo $ref | cut -d / -f 3-`

if [ "$BRANCH" = "staging" ]; then
    echo "Deploying $BRANCH..."
    git checkout staging -f
    chmod -R u+rwX,go+rX `git config core.worktree`
fi
EOA

chmod +x hooks/post-receive

echo "=================================================="
echo "Instructions                                      "
echo "=================================================="
echo "Your repository has been configured to deploy to: "
echo "/var/wwww/$REPONAME"
echo "To deploy push to a remote branch named staging"
echo "=================================================="

bash <(curl -s https://raw.github.com/gist/558927/git_deploy.sh)