Vagrant virtualbox shared disks

gistfile1.rb

   give_info = "true"
   count_shared_disk = 2
   size_shared_disk = 10
   #path_shared_disk = "/some/path"
   config.vm.provider :virtualbox do |vb|
        vb.name = vm_name_db + "." + Time.now.strftime("%y%m%d%H%M")
        vb.customize ["modifyvm", :id, "--memory", memory_DB_INSTANCES]
        vb.customize ["modifyvm", :id, "--cpus", num_CORE]
        vb.customize ["modifyvm", :id, "--groups", "/collab"]
        #first shared disk port
        port=2
        #how many shared disk
        (1..count_shared_disk).each do |disk|
          if path_shared_disk
            file_to_dbdisk = path_shared_disk + "/racattack-shared-disk"
          else
            file_to_dbdisk = "racattack-shared-disk"
          end
          if !File.exist?("#{file_to_dbdisk}#{disk}.vdi")
            unless give_info==false
              puts "NOTE:on first boot shared disks will be created, this will take some time"
              puts "ensure there is free space on the current directory for the shared disks"
              give_info=false
            end
            vb.customize ['createhd', '--filename', "#{file_to_dbdisk}#{disk}.vdi", '--size', (size_shared_disk * 1024).floor, '--variant', 'fixed']
            vb.customize ['modifyhd', "#{file_to_dbdisk}#{disk}.vdi", '--type', 'shareable']
          end
          vb.customize ['storageattach', :id, '--storagectl', 'SATA Controller', '--port', port, '--device', 0, '--type', 'hdd', '--medium', "#{file_to_dbdisk}#{disk}.vdi"]
          port=port+1
        end
      end