anchor.diff:    # Example for VirtualBox:
     #
     # config.vm.provider "virtualbox" do |vb|
  -  #   # Don't boot with headless mode
  +  #   # Display the VirtualBox GUI when booting the machine
     #   vb.gui = true
     #
  -  #   # Use VBoxManage to customize the VM. For example to change memory:
  -  #   vb.customize ["modifyvm", :id, "--memory", "1024"]
  +  #   # Customize the amount of memory on the VM:
  +  #   vb.memory = "1024"
     # end
     #
  -  # View the documentation for the provider you're using for more
  +  # View the documentation for the provider you are using for more
     # information on available options.
   
  -  # Enable provisioning with CFEngine. CFEngine Community packages are
  -  # automatically installed. For example, configure the host as a
  -  # policy server and optionally a policy file to run:
  -  #
  -  # config.vm.provision "cfengine" do |cf|
  -  #   cf.am_policy_hub = true
  -  #   # cf.run_file = "motd.cf"
  -  # end
  -  #
  -  # You can also configure and bootstrap a client to an existing
  -  # policy server:
  -  #
  -  # config.vm.provision "cfengine" do |cf|
  -  #   cf.policy_server_address = "10.0.2.15"
  -  # end
  -
  -  # Enable provisioning with Puppet stand alone.  Puppet manifests
  -  # are contained in a directory path relative to this Vagrantfile.
  -  # You will need to create the manifests directory and a manifest in
  -  # the file default.pp in the manifests_path directory.
  -  #
  -  # config.vm.provision "puppet" do |puppet|
  -  #   puppet.manifests_path = "manifests"
  -  #   puppet.manifest_file  = "default.pp"
  -  # end
  -
  -  # Enable provisioning with Chef Solo, specifying a cookbooks path, roles
  -  # path, and data_bags path (all relative to this Vagrantfile), and adding
  -  # some recipes and/or roles.
  -  #
  -  # config.vm.provision "chef_solo" do |chef|
  -  #   chef.cookbooks_path = "~/chef/cookbooks"
  -  #   chef.roles_path     = "~/chef/roles"
  -  #   chef.data_bags_path = "~/chef/data_bags"
  -  #
  -  #   chef.add_recipe "mysql"
  -  #   chef.add_role "web"
  -  #
  -  #   chef.json = { mysql_password: "foo" }
  -  # end
  -  #
  -  # Chef Solo will automatically install the latest version of Chef for you.
  -  # This can be configured in the provisioner block:
  -  #
  -  # config.vm.provision "chef_solo" do |chef|
  -  #   chef.version = "11.16.4"
  -  # end
  -  #
  -  # Alternative you can disable the installation of Chef entirely:
  -  #
  -  # config.vm.provision "chef_solo" do |chef|
  -  #   chef.install = false
  -  # end
  -
  -  # Enable provisioning with Chef Zero. The Chef Zero provisioner accepts the
  -  # exact same parameter as the Chef Solo provisioner:
  -  #
  -  # config.vm.provision "chef_zero" do |chef|
  -  #   chef.cookbooks_path = "~/chef/cookbooks"
  -  #   chef.roles_path     = "~/chef/roles"
  -  #   chef.data_bags_path = "~/chef/data_bags"
  -  #
  -  #   chef.add_recipe "mysql"
  -  #   chef.add_role "web"
  -  #
  -  #   # You may also specify custom JSON attributes:
  -  #   chef.json = { mysql_password: "foo" }
  -  # end
  -
  -  # Enable provisioning with Chef Server, specifying the chef server URL,
  -  # and the path to the validation key (relative to this Vagrantfile).
  -  #
  -  # The Hosted Chef platform uses HTTPS. Substitute your organization for
  -  # ORGNAME in the URL and validation key.
  -  #
  -  # If you have your own Chef Server, use the appropriate URL, which may be
  -  # HTTP instead of HTTPS depending on your configuration. Also change the
  -  # validation key to validation.pem.
  -  #
  -  # config.vm.provision "chef_client" do |chef|
  -  #   chef.chef_server_url     = "https://api.opscode.com/organizations/ORGNAME"
  -  #   chef.validation_key_path = "ORGNAME-validator.pem"
  -  # end
  -  #
  -  # If you're using the Hosted Chef platform, your validator client is
  -  # ORGNAME-validator, replacing ORGNAME with your organization name.
  -  #
  -  # If you have your own Chef Server, the default validation client name is
  -  # chef-validator, unless you changed the configuration.
  -  #
  -  #   chef.validation_client_name = "ORGNAME-validator"
  -  #
  -  # Chef Client will automatically install the latest version of Chef for you.
  -  # This can be configured in the provisioner block:
  -  #
  -  # config.vm.provision "chef_client" do |chef|
  -  #   chef.version = "11.16.4"
  -  # end
  -  #
  -  # Alternative you can disable the installation of Chef entirely:
  -  #
  -  # config.vm.provision "chef_client" do |chef|
  -  #   chef.install = false
  -  # end
  -
  -  # Enable provisioning with Chef Apply, specifying an inline recipe to execute
  -  # on the target system.
  -  #
  -  # config.vm.provision "chef_apply" do |chef|
  -  #   chef.recipe = <<-RECIPE
  -  #     package "curl"
  -  #   RECIPE
  -  # end
  -  #
  -  # Chef Apply will automatically install the latest version of Chef for you.
  -  # This can be configured in the provisioner block:
  -  #
  -  # config.vm.provision "chef_apply" do |chef|
  -  #   chef.version = "11.16.4"
  -  # end
  +  # Enable provisioning with a shell script. Additional provisioners such as
  +  # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
  +  # documentation for more information about their specific syntax and use.
  +  # config.vm.provision "shell", inline <<-SHELL
  +  #   sudo apt-get install apache2
  +  # SHELL
   end
  
positive.code:   # your network.
    # config.vm.network "public_network"
  
    # If true, then any SSH connections made will enable agent forwarding.
    # Default value: false
    # config.ssh.forward_agent = true
  
    # Share an additional folder to the guest VM. The first argument is
    # the path on the host to the actual folder. The second argument is
    # the path on the guest to mount the folder. And the optional third
  
negative.code: Vagrant.configure(2) do |config|
    # The most common configuration options are documented and commented below.
    # For a complete reference, please see the online documentation at
    # https://docs.vagrantup.com.
  
    # Every Vagrant development environment requires a box. You can search for
    # boxes at https://atlas.hashicorp.com/search.
    config.vm.box = "<%= box_name %>"
  
    <% if box_url -%>
  