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    if not instance.hvparams[constants.HV_ACPI]:

      kvm_cmd.extend(['-no-acpi'])

    if boot_network:

      kvm_cmd.extend(['-boot', 'n'])

    if disk_type == constants.HT_DISK_PARAVIRTUAL:

      if_val = ',if=virtio'

    else:

      drive_val = 'file=%s,format=raw%s%s' % (dev_path, if_val, boot_val)

      kvm_cmd.extend(['-drive', drive_val])

    if iso_image:

      options = ',format=raw,media=cdrom'

      if boot_cdrom:

      drive_val = 'file=%s%s' % (iso_image, options)

      kvm_cmd.extend(['-drive', drive_val])

    if kernel_path:

      kvm_cmd.extend(['-kernel', kernel_path])

      if initrd_path:

        kvm_cmd.extend(['-initrd', initrd_path])

      root_append = 'root=%s ro' % instance.hvparams[constants.HV_ROOT_PATH]

      else:

        kvm_cmd.extend(['-append', root_append])

    if mouse_type:

      kvm_cmd.extend(['-usb'])

      kvm_cmd.extend(['-usbdevice', mouse_type])

    # FIXME: handle vnc password

    if vnc_bind_address:

      if utils.IsValidIP(vnc_bind_address):

        if instance.network_port > constants.VNC_BASE_PORT:

        # Only allow tls and other option when not binding to a file, for now.

        # kvm/qemu gets confused otherwise about the filename to use.

        vnc_append = ''

          vnc_append = '%s,tls' % vnc_append

            vnc_append = '%s,x509verify=%s' % (vnc_append,

            vnc_append = '%s,x509=%s' % (vnc_append,

        vnc_arg = '%s%s' % (vnc_arg, vnc_append)

      else:

    monitor_dev = 'unix:%s,server,nowait' % \

      self._InstanceMonitor(instance.name)

    kvm_cmd.extend(['-monitor', monitor_dev])

      kvm_cmd.extend(['-serial', serial_dev])

    else:

      kvm_cmd.extend(['-serial', 'none'])

    # Save the current instance nics, but defer their expansion as parameters,

    # as we'll need to generate executable temp files for them.

    kvm_nics = instance.nics

    return (kvm_cmd, kvm_nics, hvparams)

    """Write the Xen config file for the instance.

    """

    config = StringIO()

    config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")

    # kernel handling

    config.write("kernel = '%s'\n" % kpath)

    # initrd handling

    if initrd_path:

      config.write("ramdisk = '%s'\n" % initrd_path)

    # just in case it exists

    utils.RemoveFile("/etc/xen/auto/%s" % instance.name)

    try:

    except EnvironmentError, err:

      raise errors.HypervisorError("Cannot write Xen instance confile"

                                   " file /etc/xen/%s: %s" %

    """Create a Xen 3.1 HVM config file.

    """

    config = StringIO()

    config.write("# this is autogenerated by Ganeti, please do not edit\n#\n")

    config.write("kernel = '/usr/lib/xen/boot/hvmloader'\n")

      config.write("device_model = '/usr/lib64/xen/bin/qemu-dm'\n")

    else:

      config.write("device_model = '/usr/lib/xen/bin/qemu-dm'\n")

    config.write("sdl = 0\n")

    config.write("usb = 1\n")

    config.write("usbdevice = 'tablet'\n")

    config.write("vnc = 1\n")

      config.write("vnclisten = '%s'\n" % constants.VNC_DEFAULT_BIND_ADDRESS)

    else:

    if instance.network_port > constants.VNC_BASE_PORT:

      display = instance.network_port - constants.VNC_BASE_PORT

    config.write("localtime = 1\n")

    vif_data = []

    if nic_type is None:

      # ensure old instances don't change

      nic_type_str = ", type=ioemu"

    config.write("vif = [%s]\n" % ",".join(vif_data))

    disk_data = cls._GetConfigFileDiskData(instance.disk_template,

                                            block_devices)

    if disk_type in (None, constants.HT_DISK_IOEMU):

      replacement = ",ioemu:hd"

    else:

      replacement = ",hd"

    disk_data = [line.replace(",sd", replacement) for line in disk_data]

    if iso_path:

      iso = "'file:%s,hdc:cdrom,r'" % iso_path

      disk_data.append(iso)