power.py 文件源码

def _set_boot_device(conn, domain, device):
    """Set the boot device.

    :param conn: active libvirt connection.
    :param domain: libvirt domain object.
    :raises: LibvirtError if failed update domain xml.
    """

    parsed = ET.fromstring(domain.XMLDesc())
    os = parsed.find('os')
    boot_list = os.findall('boot')

    # Clear boot list
    for boot_el in boot_list:
        os.remove(boot_el)

    boot_el = ET.SubElement(os, 'boot')
    boot_el.set('dev', device)

    try:
        conn.defineXML(ET.tostring(parsed))
    except libvirt.libvirtError as e:
        raise isd_exc.LibvirtError(err=e)