Vagrant plugin on Vagrantfile

Vagrantfile

 module MyPlugins
   class Plugin < Vagrant.plugin("2")
     name "install packages"
     config(:apt_get, :provisioner) do
       class Config < Vagrant.plugin("2", :config)
         attr_accessor :packages

         def initialize
           super
           @packages = UNSET_VALUE
         end

         def finalize!
           @packages = [] if @packages == UNSET_VALUE
         end
       end
       Config
     end

     provisioner :apt_get do
       class Provisioner < Vagrant.plugin("2", :provisioner)
         def provision
           command = "apt-get install -y #{@config.packages.join(' ')}"

           @machine.communicate.sudo(command) do |type, data|
             @machine.env.ui.info(data.chomp, prefix: false)
           end
         end
    end
  end
end

Vagrant.configure("2") do |config|
   config.vm.box = "precise64"
   config.vm.box_url = "http://files.vagrantup.com/precise64.box"
   config.vm.provision :apt_get do |p|
     p.packages = ["htop","wget", "hello"]
   end
  end
end