'Attach a host disk to a device path on the guest.
:param host_device: The device path on the host.
:param guest_device: The basename of the device path on the
guest.'

def attach_disk(self, host_device, guest_device):

    run_process(['virsh', '-c', self.url, 'attach-disk', self.instance_id, host_device, guest_device])
