system.rb

# Get the proper system type.
def system_class
  virt = node.virtualization
  if virt[:role]
    if virt[:role] == "guest" && virt[:system] == "xen"
      return "xen-guest"
    elsif virt[:role] == "host" && virt[:system] == "xen"
      return "xen-host"
    else
      return  "unknown-vm"
    end
  else
    return "hardware"
  end
end

# Assert a system class against the nodes system class
def system_class?(arg)
  return true ? arg == system_class : false
end