Snippet for Vagrantfile v2.

create_disk.rb

# http://momijiame.tumblr.com/post/67058805910/vagrant-vm
# http://qiita.com/kakipo/items/57186721eaf6b83630ee
def create_disk(vb, name, size_gb, port)
  file_path = "./tmp/#{name}.vdi"
  unless File.exist?(file_path)
    vb.customize ["createhd",
      "--filename", file_path, "--size", size_gb * 1024]
    vb.customize ["storageattach", :id,
      "--storagectl", "SATA", "--port", port, "--device", 0,
      "--type", "hdd", "--medium", file_path]
  end
end