class firewire {
  # make sure ohci1394 is not loaded
  # see http://padrao.sarava.org/trac/wiki/Debian/Firewire
  # see also the modprobe class
  exec { "rmmod ohci1394":
    unless  => "/bin/sh -c 'if `grep -q ^ohci1394 /proc/modules`; then false; else true; fi'",
    user    => "root",
  }
}