vagrant/plugins/guests/windows/cap/change_host_name.rb

module VagrantPlugins
  module GuestWindows
    module Cap
      module ChangeHostName
        def self.change_host_name(machine, name)
          # On windows, renaming a computer seems to require a reboot
          machine.communicate.execute(
            "wmic computersystem where name=\"%COMPUTERNAME%\" call rename name=\"#{name}\"",
            shell: :cmd)
        end
      end
    end
  end
end