GIT post-update hook for gitalized web. Update master branch only when it's pushed to repositary

post-update

#!/bin/sh

host="api"
domain="example.com"
sites="/path/to/your/sites"
site="$sites/$host.$domain"

cd "$site" || exit
unset GIT_DIR

update_master()
{
  echo
  echo "$host.$domain"
  echo "Update initialized"

  echo "  * Data wipe out ..."
  sudo -u www-data rm -rf *

  echo "  * Preparing essential site folders ..."
  sudo -u www-data mkdir -m 770 -p app/cache
  sudo -u www-data mkdir -m 770 -p app/logs
  sudo -u www-data mkdir -p app/config
  sudo -u www-data mkdir -p root/assets

  echo "  * Site reset & update ..."
  sudo -u www-data git reset --hard
  sudo -u www-data git clean -fX
  sudo -u www-data git pull

  if [ $? = 0 ]; then
    echo "Site update finalized!"
  else
    echo "Site update FAILED!"
  fi

  echo
}

case " $* " in
  *' refs/heads/master '*)
    update_master
    ;;
esac