vagrantfile

# -*- mode: ruby -*-
# vi: set ft=ruby :

# Configure your Laravel 4 project for this virtual machine
#
# 1- Add this environment in your project's start.php file:
#
# bootstrap/start.php:
#   $env = $app->detectEnvironment(array(
#           'vagrant' => array('vagrant-laravel4')
#           ));
#
# 2- Open a terminal and issue:
#
#   vagrant ssh
#   cp -R /home/vagrant/vagrant  /vagrant/app/config/
#
# To use the built in dev smtp start a new ssh session with:
#
#   vagrant ssh
#
# Start the smtp catchall server with the alias command:
#
#   pysmtpd
#
# Sent emails will be displayed in the ssh terminal session.
#

# Configurable variables
$hostname  = "vagrant-laravel4"
$http_port = 8080

Vagrant.configure("2") do |config|
    # Basics.
    config.vm.box     = "precise32"
    config.vm.box_url = "http://files.vagrantup.com/precise32.box"

    # Networking.
    config.vm.hostname = $hostname
    config.vm.network :forwarded_port, guest: 80, host: $http_port,
        auto_correct: true

    # Provisioning.
    config.vm.provision :shell, :path => "vagrantstrap.sh"

    # Set the ownership for Laravel 4.
    config.vm.synced_folder "app/storage", "/vagrant/app/storage", :owner => 'www-data', :group => 'www-data'
    config.vm.synced_folder "public/assets/compiled", "/vagrant/public/assets/compiled", :owner => 'www-data', :group => 'www-data'
end

You also need the vagrantstrap.sh file in the project.
https://gist.github.com/nekwebdev/5926031