def create_isolinux_image_for_bios(output_file, kernel, ramdisk,
                                   kernel_params=None):
    """Creates an isolinux image on the specified file.

    Copies the provided kernel, ramdisk to a directory, generates the isolinux
    configuration file using the kernel parameters provided, and then generates
    a bootable ISO image.

    :param output_file: the path to the file where the iso image needs to be
        created.
    :param kernel: the kernel to use.
    :param ramdisk: the ramdisk to use.
    :param kernel_params: a list of strings(each element being a string like
        'K=V' or 'K' or combination of them like 'K1=V1,K2,...') to be added
        as the kernel cmdline.
    :raises: ImageCreationFailed, if image creation failed while copying files
        or while running command to generate iso.
    """
    ISOLINUX_BIN = 'isolinux/isolinux.bin'
    ISOLINUX_CFG = 'isolinux/isolinux.cfg'

    options = {'kernel': '/vmlinuz', 'ramdisk': '/initrd'}

    with utils.tempdir() as tmpdir:
        files_info = {
            kernel: 'vmlinuz',
            ramdisk: 'initrd',
            CONF.isolinux_bin: ISOLINUX_BIN,
        }
        try:
            _create_root_fs(tmpdir, files_info)
        except (OSError, __HOLE__) as e:
            LOG.exception(_LE("Creating the filesystem root failed."))
            raise exception.ImageCreationFailed(image_type='iso', error=e)

        cfg = _generate_cfg(kernel_params,
                            CONF.isolinux_config_template, options)

        isolinux_cfg = os.path.join(tmpdir, ISOLINUX_CFG)
        utils.write_to_file(isolinux_cfg, cfg)

        try:
            utils.execute('mkisofs', '-r', '-V', "VMEDIA_BOOT_ISO",
                          '-cache-inodes', '-J', '-l', '-no-emul-boot',
                          '-boot-load-size', '4', '-boot-info-table',
                          '-b', ISOLINUX_BIN, '-o', output_file, tmpdir)
        except processutils.ProcessExecutionError as e:
            LOG.exception(_LE("Creating ISO image failed."))
            raise exception.ImageCreationFailed(image_type='iso', error=e)
dataset/ETHPy150Open openstack/ironic/ironic/common/images.py/create_isolinux_image_for_bios