Vagrantfile used to install vagrant-r10k plugin

Vagrantfile

Vagrant.configure(2) do |config|

  ## Variables (ruby syntax)
  required_plugins = %w(vagrant-r10k)
  plugin_installed = false

  ## Install Vagrant Plugins
  required_plugins.each do |plugin|
    unless Vagrant.has_plugin? plugin
      system "vagrant plugin install #{plugin}"
      plugin_installed = true
    end
  end

  ## Restart Vagrant: if new plugin installed
  if plugin_installed == true
    exec "vagrant #{ARGV.join(' ')}"
  end

  ## Every Vagrant development environment requires a box. You can search for
  #  boxes at https://atlas.hashicorp.com/search.
  config.vm.box = "ubuntu/trusty64"

  ## Create 'puppet/modules' directory for puppet provisioner(s)
  #
  #  :ALL, denotes the successive commands will be applied to all vagrant
  #       commands.
  #  -p, create directory, and parent directories if needed
  config.trigger.before :ALL do
    run "mkdir -p puppet/modules"
  end

end