This script will grab a copy of Laravel 4, install all packages, and configure Git. Run the script with no parameters for usage information.

l4.sh

#!/bin/bash

GIT=$(which git)
PHP=$(which php)
CURL=$(which curl)

COMPOSERURL="https://getcomposer.org/installer"

THIS="$0"
MODE="$1"
DIR="$2"

error() {
  echo "$1"
  exit 1
}

usage() {
  echo "This program is used as follows:
  $THIS {install|update} {installdir}

  The first parameter is the operation mode, and the second
  is the folder (relative or absolute) on which the operation
  should be run. You will need write permission on the folder
  you state." >&2
  exit 1
}

# Sanity checks
[[ $# -lt 2 ]] && { usage; }
[[ -z $2 ]] && { error "You must supply a writable folder in which you wish to install Laravel 4."; }
[[ -z $GIT || -z $PHP || -z $CURL ]] && { error "Could not find all dependencies (which, git, php, curl)"; }

function get_composer() {
  [[ ! -r ./composer.phar ]] && $CURL -sS $COMPOSERURL | $PHP
}

function install_l4() {
  # Grab Laravel 4
  $GIT clone -b develop git://github.com/laravel/laravel.git $DIR

  cd $DIR

  get_composer

  $PHP composer.phar install

  $GIT remote rename origin upstream
}

function update_l4 {
  cd $DIR
  $GIT fetch upstream
  $GIT merge upstream/develop

  get_composer

  $PHP composer.phar update
  cd - &>/dev/null
}

case $MODE in
	"install")
		echo "Installing Laravel 4 to $DIR"
		install_l4 $DIR
		;;
	"update")
		echo "Updating Laravel 4 install in $DIR"
		update_l4 $DIR
		;;
	*)
		usage
		;;
esac