virt-manager/virtinst/cli.py

#
# Utility functions for the command line drivers
#
# Copyright 2006-2007, 2013, 2014 Red Hat, Inc.
# Jeremy Katz <katzj@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.

import argparse
import collections
import logging
import logging.handlers
import os
import shlex
import subprocess
import sys
import traceback

import libvirt

from virtcli import CLIConfig

from . import util
from .clock import Clock
from .cpu import CPU
from .deviceaudio import VirtualAudio
from .devicechar import (VirtualChannelDevice, VirtualConsoleDevice,
                         VirtualSerialDevice, VirtualParallelDevice)
from .devicecontroller import VirtualController
from .devicedisk import VirtualDisk
from .devicefilesystem import VirtualFilesystem
from .devicegraphics import VirtualGraphics
from .devicehostdev import VirtualHostDevice
from .deviceinput import VirtualInputDevice
from .deviceinterface import VirtualNetworkInterface
from .devicememballoon import VirtualMemballoon
from .devicepanic import VirtualPanicDevice
from .deviceredirdev import VirtualRedirDevice
from .devicerng import VirtualRNGDevice
from .devicesmartcard import VirtualSmartCardDevice
from .devicetpm import VirtualTPMDevice
from .devicevideo import VirtualVideoDevice
from .devicewatchdog import VirtualWatchdog
from .domainblkiotune import DomainBlkiotune
from .domainfeatures import DomainFeatures
from .domainmemorybacking import DomainMemorybacking
from .domainmemorytune import DomainMemorytune
from .domainnumatune import DomainNumatune
from .domainresource import DomainResource
from .idmap import IdMap
from .nodedev import NodeDevice
from .osxml import OSXML
from .pm import PM
from .seclabel import Seclabel
from .storage import StoragePool, StorageVolume


##########################
# Global option handling #
##########################

class _GlobalState(object):
    def __init__(self):
        self.quiet = False

        self.all_checks = None
        self._validation_checks = {}

    def set_validation_check(self, checkname, val):
        self._validation_checks[checkname] = val

    def get_validation_check(self, checkname):
        if self.all_checks is not None:
            return self.all_checks

        # Default to True for all checks
        return self._validation_checks.get(checkname, True)


_globalstate = None


def get_global_state():
    return _globalstate


def _reset_global_state():
    global _globalstate
    _globalstate = _GlobalState()


####################
# CLI init helpers #
####################

class VirtStreamHandler(logging.StreamHandler):
    def emit(self, record):
        """
        Based on the StreamHandler code from python 2.6: ripping out all
        the unicode handling and just unconditionally logging seems to fix
        logging backtraces with unicode locales (for me at least).

        No doubt this is atrocious, but it WORKSFORME!
        """
        try:
            msg = self.format(record)
            stream = self.stream
            fs = "%s\n"

            stream.write(fs % msg)

            self.flush()
        except (KeyboardInterrupt, SystemExit):
            raise
        except:
            self.handleError(record)


class VirtHelpFormatter(argparse.RawDescriptionHelpFormatter):
    '''
    Subclass the default help formatter to allow printing newline characters
    in --help output. The way we do this is a huge hack :(

    Inspiration: http://groups.google.com/group/comp.lang.python/browse_thread/thread/6df6e6b541a15bc2/09f28e26af0699b1
    '''
    oldwrap = None

    def _split_lines(self, *args, **kwargs):
        def return_default():
            return argparse.RawDescriptionHelpFormatter._split_lines(
                self, *args, **kwargs)

        if len(kwargs) != 0 and len(args) != 2:
            return return_default()

        try:
            text = args[0]
            if "\n" in text:
                return text.splitlines()
            return return_default()
        except:
            return return_default()


def setupParser(usage, description, introspection_epilog=False):
    epilog = _("See man page for examples and full option syntax.")
    if introspection_epilog:
        epilog = _("Use '--option=?' or '--option help' to see "
            "available suboptions") + "\n" + epilog

    parser = argparse.ArgumentParser(
        usage=usage, description=description,
        formatter_class=VirtHelpFormatter,
        epilog=epilog)
    parser.add_argument('--version', action='version',
                        version=CLIConfig.version)

    return parser


def earlyLogging():
    logging.basicConfig(level=logging.DEBUG, format='%(message)s')


def setupLogging(appname, debug_stdout, do_quiet, cli_app=True):
    _reset_global_state()
    get_global_state().quiet = do_quiet

    vi_dir = None
    logfile = None
    if "VIRTINST_TEST_SUITE" not in os.environ:
        vi_dir = util.get_cache_dir()
        logfile = os.path.join(vi_dir, appname + ".log")

    try:
        if vi_dir and not os.access(vi_dir, os.W_OK):
            if os.path.exists(vi_dir):
                raise RuntimeError("No write access to directory %s" % vi_dir)

            try:
                os.makedirs(vi_dir, 0751)
            except IOError, e:
                raise RuntimeError("Could not create directory %s: %s" %
                                   (vi_dir, e))

        if (logfile and
            os.path.exists(logfile) and
            not os.access(logfile, os.W_OK)):
            raise RuntimeError("No write access to logfile %s" % logfile)
    except Exception, e:
        logging.warning("Error setting up logfile: %s", e)
        logfile = None


    dateFormat = "%a, %d %b %Y %H:%M:%S"
    fileFormat = ("[%(asctime)s " + appname + " %(process)d] "
                  "%(levelname)s (%(module)s:%(lineno)d) %(message)s")
    streamErrorFormat = "%(levelname)-8s %(message)s"

    rootLogger = logging.getLogger()

    # Undo early logging
    for handler in rootLogger.handlers:
        rootLogger.removeHandler(handler)

    rootLogger.setLevel(logging.DEBUG)
    if logfile:
        fileHandler = logging.handlers.RotatingFileHandler(
            logfile, "ae", 1024 * 1024, 5)
        fileHandler.setFormatter(
            logging.Formatter(fileFormat, dateFormat))
        rootLogger.addHandler(fileHandler)

    streamHandler = VirtStreamHandler(sys.stderr)
    if debug_stdout:
        streamHandler.setLevel(logging.DEBUG)
        streamHandler.setFormatter(logging.Formatter(fileFormat,
                                                     dateFormat))
    elif cli_app or not logfile:
        if get_global_state().quiet:
            level = logging.ERROR
        else:
            level = logging.WARN
        streamHandler.setLevel(level)
        streamHandler.setFormatter(logging.Formatter(streamErrorFormat))
    else:
        streamHandler = None

    if streamHandler:
        rootLogger.addHandler(streamHandler)

    util.register_libvirt_error_handler()

    # Log uncaught exceptions
    def exception_log(typ, val, tb):
        logging.debug("Uncaught exception:\n%s",
                      "".join(traceback.format_exception(typ, val, tb)))
        sys.__excepthook__(typ, val, tb)
    sys.excepthook = exception_log

    logging.getLogger("requests").setLevel(logging.ERROR)

    # Log the app command string
    logging.debug("Launched with command line: %s", " ".join(sys.argv))


##############################
# Libvirt connection helpers #
##############################

def getConnection(uri):
    from .connection import VirtualConnection

    logging.debug("Requesting libvirt URI %s", (uri or "default"))
    conn = VirtualConnection(uri)
    conn.open(_do_creds_authname)
    conn.cache_object_fetch = True
    logging.debug("Received libvirt URI %s", conn.uri)

    return conn


# SASL username/pass auth
def _do_creds_authname(creds):
    retindex = 4

    for cred in creds:
        credtype, prompt, ignore, ignore, ignore = cred
        prompt += ": "

        res = cred[retindex]
        if credtype == libvirt.VIR_CRED_AUTHNAME:
            res = raw_input(prompt)
        elif credtype == libvirt.VIR_CRED_PASSPHRASE:
            import getpass
            res = getpass.getpass(prompt)
        else:
            raise RuntimeError("Unknown auth type in creds callback: %d" %
                               credtype)

        cred[retindex] = res
    return 0


##############################
# Misc CLI utility functions #
##############################

def fail(msg, do_exit=True):
    """
    Convenience function when failing in cli app
    """
    logging.debug("".join(traceback.format_stack()))
    logging.error(msg)
    if traceback.format_exc().strip() != "None":
        logging.debug("", exc_info=True)
    if do_exit:
        _fail_exit()


def print_stdout(msg, do_force=False):
    if do_force or not get_global_state().quiet:
        print msg


def print_stderr(msg):
    logging.debug(msg)
    print >> sys.stderr, msg


def _fail_exit():
    sys.exit(1)


def nice_exit():
    print_stdout(_("Exiting at user request."))
    sys.exit(0)


def virsh_start_cmd(guest):
    return ("virsh --connect %s start %s" % (guest.conn.uri, guest.name))


def install_fail(guest):
    virshcmd = virsh_start_cmd(guest)

    print_stderr(
        _("Domain installation does not appear to have been successful.\n"
          "If it was, you can restart your domain by running:\n"
          "  %s\n"
          "otherwise, please restart your installation.") % virshcmd)
    sys.exit(1)


def set_prompt(prompt):
    # Set whether we allow prompts, or fail if a prompt pops up
    if prompt:
        logging.warning("--prompt mode is no longer supported.")


def validate_disk(dev, warn_overwrite=False):
    def _optional_fail(msg, checkname):
        do_check = get_global_state().get_validation_check(checkname)
        if do_check:
            fail(msg + (_(" (Use --check %s=off or "
                "--check all=off to override)") % checkname))

        logging.debug("Skipping --check %s error condition '%s'",
            checkname, msg)
        logging.warn(msg)

    def check_path_exists(dev):
        """
        Prompt if disk file already exists and preserve mode is not used
        """
        if not warn_overwrite:
            return
        if not VirtualDisk.path_definitely_exists(dev.conn, dev.path):
            return
        _optional_fail(
            _("This will overwrite the existing path '%s'") % dev.path,
            "path_exists")

    def check_inuse_conflict(dev):
        """
        Check if disk is inuse by another guest
        """
        names = dev.is_conflict_disk()
        if not names:
            return

        _optional_fail(_("Disk %s is already in use by other guests %s." %
            (dev.path, names)),
            "path_in_use")

    def check_size_conflict(dev):
        """
        Check if specified size exceeds available storage
        """
        isfatal, errmsg = dev.is_size_conflict()
        # The isfatal case should have already caused us to fail
        if not isfatal and errmsg:
            _optional_fail(errmsg, "disk_size")

    def check_path_search(dev):
        user, broken_paths = dev.check_path_search(dev.conn, dev.path)
        if not broken_paths:
            return
        logging.warning(_("%s may not be accessible by the hypervisor. "
            "You will need to grant the '%s' user search permissions for "
            "the following directories: %s"), dev.path, user, broken_paths)

    check_path_exists(dev)
    check_inuse_conflict(dev)
    check_size_conflict(dev)
    check_path_search(dev)


def _run_console(args):
    logging.debug("Running: %s", " ".join(args))
    child = os.fork()
    if child:
        return child

    os.execvp(args[0], args)
    os._exit(1)  # pylint: disable=protected-access


def _gfx_console(guest):
    args = ["virt-viewer",
            "--connect", guest.conn.uri,
            "--wait", guest.name]

    # Currently virt-viewer needs attaching to the local display while
    # spice gl is enabled.
    if guest.has_gl():
        args.append("--attach")

    logging.debug("Launching virt-viewer for graphics type '%s'",
        guest.get_devices("graphics")[0].type)
    return _run_console(args)


def _txt_console(guest):
    args = ["virsh",
            "--connect", guest.conn.uri,
            "console", guest.name]

    logging.debug("Connecting to text console")
    return _run_console(args)


def connect_console(guest, consolecb, wait):
    """
    Launched the passed console callback for the already defined
    domain. If domain isn't running, return an error.
    """
    child = None
    if consolecb:
        child = consolecb(guest)

    if not child or not wait:
        return

    # If we connected the console, wait for it to finish
    try:
        os.waitpid(child, 0)
    except OSError, e:
        logging.debug("waitpid: %s: %s", e.errno, e.message)


def get_console_cb(guest):
    gdevs = guest.get_devices("graphics")
    if not gdevs:
        return _txt_console

    gtype = gdevs[0].type
    if gtype not in ["default",
        VirtualGraphics.TYPE_VNC,
        VirtualGraphics.TYPE_SPICE]:
        logging.debug("No viewer to launch for graphics type '%s'", gtype)
        return

    try:
        subprocess.check_output(["virt-viewer", "--version"])
    except OSError:
        logging.warn(_("Unable to connect to graphical console: "
                       "virt-viewer not installed. Please install "
                       "the 'virt-viewer' package."))
        return None

    if not os.environ.get("DISPLAY", ""):
        logging.warn(_("Graphics requested but DISPLAY is not set. "
                       "Not running virt-viewer."))
        return None

    return _gfx_console


def get_meter():
    quiet = (get_global_state().quiet or "VIRTINST_TEST_SUITE" in os.environ)
    return util.make_meter(quiet=quiet)


###########################
# Common CLI option/group #
###########################

def add_connect_option(parser, invoker=None):
    if invoker == "virt-xml":
        parser.add_argument("-c", "--connect", metavar="URI",
                help=_("Connect to hypervisor with libvirt URI"))
    else:
        parser.add_argument("--connect", metavar="URI",
                help=_("Connect to hypervisor with libvirt URI"))


def add_misc_options(grp, prompt=False, replace=False,
                     printxml=False, printstep=False,
                     noreboot=False, dryrun=False,
                     noautoconsole=False):
    if prompt:
        grp.add_argument("--prompt", action="store_true",
                        default=False, help=argparse.SUPPRESS)
        grp.add_argument("--force", action="store_true",
                        default=False, help=argparse.SUPPRESS)

    if noautoconsole:
        grp.add_argument("--noautoconsole", action="store_false",
            dest="autoconsole", default=True,
            help=_("Don't automatically try to connect to the guest console"))

    if noreboot:
        grp.add_argument("--noreboot", action="store_true",
                       help=_("Don't boot guest after completing install."))

    if replace:
        grp.add_argument("--replace", action="store_true",
            help=_("Don't check name collision, overwrite any guest "
                   "with the same name."))

    if printxml:
        print_kwargs = {
            "dest": "xmlonly",
            "default": False,
            "help": _("Print the generated domain XML rather than create "
                "the guest."),
        }

        if printstep:
            print_kwargs["nargs"] = "?"
            print_kwargs["const"] = "all"
        else:
            print_kwargs["action"] = "store_true"

        grp.add_argument("--print-xml", **print_kwargs)
        if printstep:
            # Back compat, argparse allows us to use --print-xml
            # for everything.
            grp.add_argument("--print-step", dest="xmlstep",
                help=argparse.SUPPRESS)

    if dryrun:
        grp.add_argument("--dry-run", action="store_true", dest="dry",
                       help=_("Run through install process, but do not "
                              "create devices or define the guest."))

    if prompt:
        grp.add_argument("--check",
            help=_("Enable or disable validation checks. Example:\n"
                   "--check path_in_use=off\n"
                   "--check all=off"))
    grp.add_argument("-q", "--quiet", action="store_true",
                   help=_("Suppress non-error output"))
    grp.add_argument("-d", "--debug", action="store_true",
                   help=_("Print debugging information"))


def add_metadata_option(grp):
    grp.add_argument("--metadata",
        help=_("Configure guest metadata. Ex:\n"
        "--metadata name=foo,title=\"My pretty title\",uuid=...\n"
        "--metadata description=\"My nice long description\""))


def add_memory_option(grp, backcompat=False):
    grp.add_argument("--memory",
        help=_("Configure guest memory allocation. Ex:\n"
               "--memory 1024 (in MiB)\n"
               "--memory 512,maxmemory=1024"))
    if backcompat:
        grp.add_argument("-r", "--ram", type=int, dest="oldmemory",
            help=argparse.SUPPRESS)


def vcpu_cli_options(grp, backcompat=True, editexample=False):
    grp.add_argument("--vcpus",
        help=_("Number of vcpus to configure for your guest. Ex:\n"
               "--vcpus 5\n"
               "--vcpus 5,maxcpus=10,cpuset=1-4,6,8\n"
               "--vcpus sockets=2,cores=4,threads=2,"))

    extramsg = "--cpu host"
    if editexample:
        extramsg = "--cpu host-model,clearxml=yes"
    grp.add_argument("--cpu",
        help=_("CPU model and features. Ex:\n"
               "--cpu coreduo,+x2apic\n") + extramsg)

    if backcompat:
        grp.add_argument("--check-cpu", action="store_true",
                         help=argparse.SUPPRESS)
        grp.add_argument("--cpuset", help=argparse.SUPPRESS)


def add_gfx_option(devg):
    devg.add_argument("--graphics", action="append",
      help=_("Configure guest display settings. Ex:\n"
             "--graphics vnc\n"
             "--graphics spice,port=5901,tlsport=5902\n"
             "--graphics none\n"
             "--graphics vnc,password=foobar,port=5910,keymap=ja"))


def add_net_option(devg):
    devg.add_argument("-w", "--network", action="append",
      help=_("Configure a guest network interface. Ex:\n"
             "--network bridge=mybr0\n"
             "--network network=my_libvirt_virtual_net\n"
             "--network network=mynet,model=virtio,mac=00:11...\n"
             "--network none\n"
             "--network help"))


def add_device_options(devg, sound_back_compat=False):
    devg.add_argument("--controller", action="append",
                    help=_("Configure a guest controller device. Ex:\n"
                           "--controller type=usb,model=ich9-ehci1"))
    devg.add_argument("--input", action="append",
        help=_("Configure a guest input device. Ex:\n"
               "--input tablet\n"
               "--input keyboard,bus=usb"))
    devg.add_argument("--serial", action="append",
                    help=_("Configure a guest serial device"))
    devg.add_argument("--parallel", action="append",
                    help=_("Configure a guest parallel device"))
    devg.add_argument("--channel", action="append",
                    help=_("Configure a guest communication channel"))
    devg.add_argument("--console", action="append",
                    help=_("Configure a text console connection between "
                           "the guest and host"))
    devg.add_argument("--hostdev", action="append",
                    help=_("Configure physical USB/PCI/etc host devices "
                           "to be shared with the guest"))
    devg.add_argument("--filesystem", action="append",
        help=_("Pass host directory to the guest. Ex: \n"
               "--filesystem /my/source/dir,/dir/in/guest\n"
               "--filesystem template_name,/,type=template"))

    # Back compat name
    devg.add_argument("--host-device", action="append", dest="hostdev",
                    help=argparse.SUPPRESS)

    # --sound used to be a boolean option, hence the nargs handling
    sound_kwargs = {
        "action": "append",
        "help": _("Configure guest sound device emulation"),
    }
    if sound_back_compat:
        sound_kwargs["nargs"] = '?'
    devg.add_argument("--sound", **sound_kwargs)
    if sound_back_compat:
        devg.add_argument("--soundhw", action="append", dest="sound",
            help=argparse.SUPPRESS)

    devg.add_argument("--watchdog", action="append",
                    help=_("Configure a guest watchdog device"))
    devg.add_argument("--video", action="append",
                    help=_("Configure guest video hardware."))
    devg.add_argument("--smartcard", action="append",
                    help=_("Configure a guest smartcard device. Ex:\n"
                           "--smartcard mode=passthrough"))
    devg.add_argument("--redirdev", action="append",
                    help=_("Configure a guest redirection device. Ex:\n"
                           "--redirdev usb,type=tcp,server=192.168.1.1:4000"))
    devg.add_argument("--memballoon", action="append",
                    help=_("Configure a guest memballoon device. Ex:\n"
                           "--memballoon model=virtio"))
    devg.add_argument("--tpm", action="append",
                    help=_("Configure a guest TPM device. Ex:\n"
                           "--tpm /dev/tpm"))
    devg.add_argument("--rng", action="append",
                    help=_("Configure a guest RNG device. Ex:\n"
                           "--rng /dev/random"))
    devg.add_argument("--panic", action="append",
                    help=_("Configure a guest panic device. Ex:\n"
                           "--panic default"))


def add_guest_xml_options(geng):
    geng.add_argument("--security", action="append",
        help=_("Set domain security driver configuration."))
    geng.add_argument("--numatune",
        help=_("Tune NUMA policy for the domain process."))
    geng.add_argument("--memtune", action="append",
        help=_("Tune memory policy for the domain process."))
    geng.add_argument("--blkiotune", action="append",
        help=_("Tune blkio policy for the domain process."))
    geng.add_argument("--memorybacking", action="append",
        help=_("Set memory backing policy for the domain process. Ex:\n"
               "--memorybacking hugepages=on"))
    geng.add_argument("--features",
        help=_("Set domain <features> XML. Ex:\n"
               "--features acpi=off\n"
               "--features apic=on,eoi=on"))
    geng.add_argument("--clock",
        help=_("Set domain <clock> XML. Ex:\n"
               "--clock offset=localtime,rtc_tickpolicy=catchup"))
    geng.add_argument("--pm",
        help=_("Configure VM power management features"))
    geng.add_argument("--events",
        help=_("Configure VM lifecycle management policy"))
    geng.add_argument("--resource", action="append",
        help=_("Configure VM resource partitioning (cgroups)"))


def add_boot_options(insg):
    insg.add_argument("--boot",
        help=_("Configure guest boot settings. Ex:\n"
               "--boot hd,cdrom,menu=on\n"
               "--boot init=/sbin/init (for containers)"))
    insg.add_argument("--idmap",
        help=_("Enable user namespace for LXC container. Ex:\n"
               "--idmap uid_start=0,uid_target=1000,uid_count=10"))


def add_disk_option(stog, editexample=False):
    editmsg = ""
    if editexample:
        editmsg += "\n--disk cache=  (unset cache)"
    stog.add_argument("--disk", action="append",
        help=_("Specify storage with various options. Ex.\n"
               "--disk size=10 (new 10GiB image in default location)\n"
               "--disk /my/existing/disk,cache=none\n"
               "--disk device=cdrom,bus=scsi\n"
               "--disk=?") + editmsg)


#############################################
# CLI complex parsing helpers               #
# (for options like --disk, --network, etc. #
#############################################

def _raw_on_off_convert(s):
    tvalues = ["y", "yes", "1", "true", "t", "on"]
    fvalues = ["n", "no", "0", "false", "f", "off"]

    s = (s or "").lower()
    if s in tvalues:
        return True
    elif s in fvalues:
        return False
    return None


def _on_off_convert(key, val):
    if val is None:
        return None

    val = _raw_on_off_convert(val)
    if val is not None:
        return val
    raise fail(_("%(key)s must be 'yes' or 'no'") % {"key": key})


class _VirtCLIArgument(object):
    def __init__(self, attrname, cliname,
                 cb=None, ignore_default=False,
                 can_comma=False, aliases=None,
                 is_list=False, is_onoff=False,
                 lookup_cb=None, is_novalue=False):
        """
        A single subargument passed to compound command lines like --disk,
        --network, etc.

        @attrname: The virtinst API attribute name the cliargument maps to.
            If this is a virtinst object method, it will be called.
        @cliname: The command line option name, 'path' for path=FOO

        @cb: Rather than set an attribute directly on the virtinst
            object, (self, inst, val, virtarg) to this callback to handle it.
        @ignore_default: If the value passed on the cli is 'default', don't
            do anything.
        @can_comma: If True, this option is expected to have embedded commas.
            After the parser sees this option, it will iterate over the
            option string until it finds another known argument name:
            everything prior to that argument name is considered part of
            the value of this option, '=' included. Should be used sparingly.
        @aliases: List of cli aliases. Useful if we want to change a property
            name on the cli but maintain back compat.
        @is_list: This value should be stored as a list, so multiple instances
            are appended.
        @is_onoff: The value expected on the cli is on/off or yes/no, convert
            it to true/false.
        @lookup_cb: If specified, use this function for performing match
            lookups.
        @is_novalue: If specified, the parameter is not expected in the
            form FOO=BAR, but just FOO.
        """
        self.attrname = attrname
        self.cliname = cliname

        self.cb = cb
        self.can_comma = can_comma
        self.ignore_default = ignore_default
        self.aliases = util.listify(aliases)
        self.is_list = is_list
        self.is_onoff = is_onoff
        self.lookup_cb = lookup_cb
        self.is_novalue = is_novalue

    def _pop_opt(self, optdict, key):
        """
        Basically optdict.pop(key, None) with is_novalue wrapped in
        """
        if key not in optdict:
            return None

        ret = optdict.pop(key)
        if ret is None:
            if not self.is_novalue:
                raise RuntimeError("Option '%s' had no value set." % key)
            ret = ""

        return ret

    def _lookup_val(self, optdict):
        """
        Find the value in 'optdict' thats associated with this Argument,
        and perform some other misc checking
        """
        val = None
        for cliname in self.aliases + [self.cliname]:
            # We iterate over all values unconditionally, so they are
            # removed from optdict
            foundval = self._pop_opt(optdict, cliname)
            if foundval is not None:
                val = foundval
        if val is None:
            return 0
        if val == "":
            val = None
        if self.is_onoff:
            val = _on_off_convert(self.cliname, val)

        return val

    def parse_param(self, parser, optdict, inst, support_cb):
        """
        Process the cli param against the pass inst.

        So if we are VirtCLIArgument for --disk device=, and the user
        specified --disk device=foo, we grab 'device=foo' from the
        parsed 'optdict', and set inst.device = foo
        """
        val = self._lookup_val(optdict)
        if val is 0:
            return
        if support_cb:
            support_cb(inst, self)
        if val == "default" and self.ignore_default:
            return

        try:
            if self.attrname:
                eval("inst." + self.attrname)  # pylint: disable=eval-used
        except AttributeError:
            raise RuntimeError("programming error: obj=%s does not have "
                               "member=%s" % (inst, self.attrname))

        if self.cb:
            self.cb(parser, inst, val, self)
        else:
            exec(  # pylint: disable=exec-used
                "inst." + self.attrname + " = val")

    def lookup_param(self, parser, optdict, inst):
        """
        See if the passed value matches our Argument, like via virt-xml

        So if this Argument is for --disk device=, and the user
        specified virt-xml --edit device=floppy --disk ..., we grab
        device=floppy from 'optdict', then return 'inst.device == floppy'
        """
        val = self._lookup_val(optdict)
        if val is 0:
            return

        if not self.attrname and not self.lookup_cb:
            raise RuntimeError(
                _("Don't know how to match device type '%(device_type)s' "
                  "property '%(property_name)s'") %
                {"device_type": getattr(inst, "virtual_device_type", ""),
                 "property_name": self.cliname})

        if self.lookup_cb:
            return self.lookup_cb(parser, inst, val, self)
        else:
            return eval(  # pylint: disable=eval-used
                "inst." + self.attrname) == val

    def match_name(self, cliname):
        """
        Return True if the passed argument name matches this
        VirtCLIArgument. So for an option like --foo bar=X, this
        checks if we are the parser for 'bar'
        """
        for argname in [self.cliname] + self.aliases:
            if argname == cliname:
                return True
        return False


def parse_optstr_tuples(optstr):
    """
    Parse the command string into an ordered list of tuples. So
    a string like --disk path=foo,size=5,path=bar will end up like

    [("path", "foo"), ("size", "5"), ("path", "bar")]
    """
    argsplitter = shlex.shlex(optstr or "", posix=True)
    argsplitter.commenters = ""
    argsplitter.whitespace = ","
    argsplitter.whitespace_split = True
    ret = []

    for opt in list(argsplitter):
        if not opt:
            continue

        if opt.count("="):
            cliname, val = opt.split("=", 1)
        else:
            cliname = opt
            val = None

        ret.append((cliname, val))
    return ret


def _parse_optstr_to_dict(optstr, virtargs, remove_first):
    """
    Parse the passed argument string into an OrderedDict WRT
    the passed list of VirtCLIArguments and their special handling.

    So for --disk path=foo,size=5, optstr is 'path=foo,size=5', and
    we return {"path": "foo", "size": "5"}
    """
    optsdict = collections.OrderedDict()
    opttuples = parse_optstr_tuples(optstr)

    def _add_opt(virtarg, cliname, val):
        if (cliname not in optsdict and
            virtarg and
            virtarg.is_list):
            optsdict[cliname] = []

        if type(optsdict.get(cliname)) is list:
            optsdict[cliname].append(val)
        else:
            optsdict[cliname] = val

    def _lookup_virtarg(cliname):
        for virtarg in virtargs:
            if virtarg.match_name(cliname):
                return virtarg

    # Splice in remove_first names upfront
    remove_first = util.listify(remove_first)[:]
    for idx, (cliname, val) in enumerate(opttuples):
        if val is not None or not remove_first:
            break
        opttuples[idx] = (remove_first.pop(0), cliname)

    commaopt = []
    virtarg = None
    for cliname, val in opttuples:
        virtarg = _lookup_virtarg(cliname)
        if commaopt:
            if not virtarg:
                commaopt[1] += "," + cliname
                if val:
                    commaopt[1] += "=" + val
                continue

            _add_opt(virtarg, commaopt[0], commaopt[1])
            commaopt = []

        if (virtarg and virtarg.can_comma):
            commaopt = [cliname, val]
            continue

        _add_opt(virtarg, cliname, val)

    if commaopt:
        _add_opt(virtarg, commaopt[0], commaopt[1])

    return optsdict


class VirtCLIParser(object):
    """
    Parse a compound arg string like --option foo=bar,baz=12. This is
    the desired interface to VirtCLIArgument and VirtCLIOptionString.

    A command line argument like --disk just extends this interface
    and calls add_arg a bunch to register subarguments like path=,
    size=, etc. See existing impls examples of how to do all sorts of
    crazy stuff.

    Class parameters:
    @remove_first: List of parameters to peel off the front of the
        option string, and store in the optdict. So:
        remove_first=["char_type"] for --serial pty,foo=bar
        maps to {"char_type", "pty", "foo" : "bar"}
    @check_none: If the parsed option string is just 'none', return None
    @support_cb: An extra support check function for further validation.
        Called before the virtinst object is altered. Take arguments
        (inst, attrname, cliname)
    @clear_attr: If the user requests to clear the XML (--disk clearxml),
        this is the property name we grab from inst to actually clear
        (so 'security' to get guest.security). If it's True, then
        clear inst (in the case of devices)
    @cli_arg_name: The command line argument this maps to, so
        "hostdev" for --hostdev
    """
    objclass = None
    remove_first = None
    check_none = False
    support_cb = None
    clear_attr = None
    cli_arg_name = None
    _virtargs = []

    @classmethod
    def add_arg(cls, *args, **kwargs):
        """
        Add a VirtCLIArgument for this class.
        """
        if not cls._virtargs:
            cls._virtargs = [_VirtCLIArgument(None, "clearxml",
                             cb=cls._clearxml_cb,
                             is_onoff=True)]
        cls._virtargs.append(_VirtCLIArgument(*args, **kwargs))

    @classmethod
    def print_introspection(cls):
        """
        Print out all _param names, triggered via ex. --disk help
        """
        print "--%s options:" % cls.cli_arg_name
        for arg in sorted(cls._virtargs, key=lambda p: p.cliname):
            print "  %s" % arg.cliname
        print


    def __init__(self, guest, optstr):
        self.guest = guest
        self.optstr = optstr
        self.optdict = _parse_optstr_to_dict(self.optstr,
                                             self._virtargs,
                                             self.remove_first)

    def _clearxml_cb(self, inst, val, virtarg):
        """
        Callback that handles virt-xml clearxml=yes|no magic
        """
        if not self.objclass and not self.clear_attr:
            raise RuntimeError("Don't know how to clearxml --%s" %
                               self.cli_arg_name)
        if val is not True:
            return

        clear_inst = inst
        if self.clear_attr:
            clear_inst = getattr(inst, self.clear_attr)

        # If there's any opts remaining, leave the root stub element
        # in place with leave_stub=True, so virt-xml updates are done
        # in place.
        #
        # Example: --edit --cpu clearxml=yes should remove the <cpu>
        # block. But --edit --cpu clearxml=yes,model=foo should leave
        # a <cpu> stub in place, so that it gets model=foo in place,
        # otherwise the newly created cpu block gets appened to the
        # end of the domain XML, which gives an ugly diff
        clear_inst.clear(leave_stub=bool(self.optdict))

    def _parse(self, inst):
        """
        Subclasses can hook into this to do any pre/post processing
        of the inst, or self.optdict
        """
        for param in self._virtargs:
            param.parse_param(self, self.optdict, inst, self.support_cb)

        # Check leftover opts
        if self.optdict:
            fail(_("Unknown options %s") % self.optdict.keys())
        return inst

    def parse(self, inst, validate=True):
        """
        Main entry point. Iterate over self._virtargs, and serialize
        self.optdict into 'inst'.

        For virt-xml, 'inst' is the virtinst object we are editing,
        ex. a VirtualDisk from a parsed Guest object.
        For virt-install, 'inst' is None, and we will create a new
        inst from self.objclass, or edit a singleton object in place
        like Guest.features/DomainFeatures
        """
        if not self.optstr:
            return None
        if self.check_none and self.optstr == "none":
            return None

        new_object = False
        if self.objclass and not inst:
            if self.guest.child_class_is_singleton(self.objclass):
                inst = self.guest.list_children_for_class(self.objclass)[0]
            else:
                new_object = True
                inst = self.objclass(  # pylint: disable=not-callable
                        self.guest.conn)

        ret = []
        try:
            objs = self._parse(inst or self.guest)
            for obj in util.listify(objs):
                if not new_object:
                    break
                if validate:
                    obj.validate()
                self.guest.add_child(obj)

            ret += util.listify(objs)
        except Exception, e:
            logging.debug("Exception parsing inst=%s optstr=%s",
                          inst, self.optstr, exc_info=True)
            fail(_("Error: --%(cli_arg_name)s %(options)s: %(err)s") %
                    {"cli_arg_name": self.cli_arg_name,
                     "options": self.optstr, "err": str(e)})

        return ret

    def lookup_child_from_option_string(self):
        """
        Given a passed option string, search the guests' child list
        for all objects which match the passed options.

        Used only by virt-xml --edit lookups
        """
        ret = []
        objlist = self.guest.list_children_for_class(self.objclass)

        for inst in objlist:
            try:
                optdict = self.optdict.copy()
                valid = False
                for param in self._virtargs:
                    paramret = param.lookup_param(self, optdict, inst)
                    if paramret is True:
                        valid = True
                        break
                if valid:
                    ret.append(inst)
            except Exception, e:
                logging.debug("Exception parsing inst=%s optstr=%s",
                              inst, self.optstr, exc_info=True)
                fail(_("Error: --%(cli_arg_name)s %(options)s: %(err)s") %
                        {"cli_arg_name": self.cli_arg_name,
                         "options": self.optstr, "err": str(e)})

        return ret


VIRT_PARSERS = []


def _register_virt_parser(parserclass):
    VIRT_PARSERS.append(parserclass)


###################
# --check parsing #
###################

def convert_old_force(options):
    if options.force:
        if not options.check:
            options.check = "all=off"
        del(options.force)


class ParseCLICheck(VirtCLIParser):
    cli_arg_name = "check"

    def set_cb(self, inst, val, virtarg):
        # This sets properties on the _GlobalState objects
        inst.set_validation_check(virtarg.cliname, val)


ParseCLICheck.add_arg(None, "path_in_use", is_onoff=True,
                      cb=ParseCLICheck.set_cb)
ParseCLICheck.add_arg(None, "disk_size", is_onoff=True,
                      cb=ParseCLICheck.set_cb)
ParseCLICheck.add_arg(None, "path_exists", is_onoff=True,
                      cb=ParseCLICheck.set_cb)
ParseCLICheck.add_arg("all_checks", "all", is_onoff=True)


def parse_check(checkstr):
    # Overwrite this for each parse
    parser = ParseCLICheck(None, checkstr)
    parser.parse(get_global_state())


######################
# --metadata parsing #
######################

class ParserMetadata(VirtCLIParser):
    cli_arg_name = "metadata"

_register_virt_parser(ParserMetadata)
ParserMetadata.add_arg("name", "name", can_comma=True)
ParserMetadata.add_arg("title", "title", can_comma=True)
ParserMetadata.add_arg("uuid", "uuid")
ParserMetadata.add_arg("description", "description", can_comma=True)


####################
# --events parsing #
####################

class ParserEvents(VirtCLIParser):
    cli_arg_name = "events"

_register_virt_parser(ParserEvents)
ParserEvents.add_arg("on_poweroff", "on_poweroff")
ParserEvents.add_arg("on_reboot", "on_reboot")
ParserEvents.add_arg("on_crash", "on_crash")
ParserEvents.add_arg("on_lockfailure", "on_lockfailure")


######################
# --resource parsing #
######################

class ParserResource(VirtCLIParser):
    cli_arg_name = "resource"
    objclass = DomainResource
    remove_first = "partition"

_register_virt_parser(ParserResource)
ParserResource.add_arg("partition", "partition")


######################
# --numatune parsing #
######################

class ParserNumatune(VirtCLIParser):
    cli_arg_name = "numatune"
    objclass = DomainNumatune
    remove_first = "nodeset"

_register_virt_parser(ParserNumatune)
ParserNumatune.add_arg("memory_nodeset", "nodeset", can_comma=True)
ParserNumatune.add_arg("memory_mode", "mode")


####################
# --memory parsing #
####################

class ParserMemory(VirtCLIParser):
    cli_arg_name = "memory"
    remove_first = "memory"

    def set_memory_cb(self, inst, val, virtarg):
        setattr(inst, virtarg.cliname, int(val) * 1024)


_register_virt_parser(ParserMemory)
ParserMemory.add_arg("memory", "memory", cb=ParserMemory.set_memory_cb)
ParserMemory.add_arg("maxmemory", "maxmemory", cb=ParserMemory.set_memory_cb)
ParserMemory.add_arg("memoryBacking.hugepages", "hugepages", is_onoff=True)


#####################
# --memtune parsing #
#####################

class ParserMemorytune(VirtCLIParser):
    cli_arg_name = "memtune"
    objclass = DomainMemorytune
    remove_first = "soft_limit"

_register_virt_parser(ParserMemorytune)
ParserMemorytune.add_arg("hard_limit", "hard_limit")
ParserMemorytune.add_arg("soft_limit", "soft_limit")
ParserMemorytune.add_arg("swap_hard_limit", "swap_hard_limit")
ParserMemorytune.add_arg("min_guarantee", "min_guarantee")


#######################
# --blkiotune parsing #
#######################

class ParserBlkiotune(VirtCLIParser):
    cli_arg_name = "blkiotune"
    objclass = DomainBlkiotune
    remove_first = "weight"

_register_virt_parser(ParserBlkiotune)
ParserBlkiotune.add_arg("weight", "weight")
ParserBlkiotune.add_arg("device_path", "device_path")
ParserBlkiotune.add_arg("device_weight", "device_weight")


###########################
# --memorybacking parsing #
###########################

class ParserMemorybacking(VirtCLIParser):
    cli_arg_name = "memorybacking"
    objclass = DomainMemorybacking

_register_virt_parser(ParserMemorybacking)
ParserMemorybacking.add_arg("hugepages", "hugepages", is_onoff=True)
ParserMemorybacking.add_arg("page_size", "size")
ParserMemorybacking.add_arg("page_unit", "unit")
ParserMemorybacking.add_arg("page_nodeset", "nodeset", can_comma=True)
ParserMemorybacking.add_arg("nosharepages", "nosharepages", is_onoff=True)
ParserMemorybacking.add_arg("locked", "locked", is_onoff=True)


#################
# --cpu parsing #
#################

class ParserCPU(VirtCLIParser):
    cli_arg_name = "cpu"
    objclass = CPU
    remove_first = "model"

    def set_model_cb(self, inst, val, virtarg):
        if val == "host":
            val = inst.SPECIAL_MODE_HOST_MODEL
        if val == "none":
            val = inst.SPECIAL_MODE_CLEAR

        if val in inst.SPECIAL_MODES:
            inst.set_special_mode(val)
        else:
            inst.model = val

    def set_feature_cb(self, inst, val, virtarg):
        policy = virtarg.cliname
        for feature_name in util.listify(val):
            featureobj = None

            for f in inst.features:
                if f.name == feature_name:
                    featureobj = f
                    break

            if featureobj:
                featureobj.policy = policy
            else:
                inst.add_feature(feature_name, policy)

    def _parse(self, inst):
        # Convert +feature, -feature into expected format
        for key, value in self.optdict.items():
            policy = None
            if value or len(key) == 1:
                continue

            if key.startswith("+"):
                policy = "force"
            elif key.startswith("-"):
                policy = "disable"

            if policy:
                del(self.optdict[key])
                if self.optdict.get(policy) is None:
                    self.optdict[policy] = []
                self.optdict[policy].append(key[1:])

        return VirtCLIParser._parse(self, inst)


_register_virt_parser(ParserCPU)
ParserCPU.add_arg(None, "model", cb=ParserCPU.set_model_cb)
ParserCPU.add_arg("mode", "mode")
ParserCPU.add_arg("match", "match")
ParserCPU.add_arg("vendor", "vendor")

ParserCPU.add_arg(None, "force", is_list=True, cb=ParserCPU.set_feature_cb)
ParserCPU.add_arg(None, "require", is_list=True, cb=ParserCPU.set_feature_cb)
ParserCPU.add_arg(None, "optional", is_list=True, cb=ParserCPU.set_feature_cb)
ParserCPU.add_arg(None, "disable", is_list=True, cb=ParserCPU.set_feature_cb)
ParserCPU.add_arg(None, "forbid", is_list=True, cb=ParserCPU.set_feature_cb)


###################
# --vcpus parsing #
###################

class ParserVCPU(VirtCLIParser):
    cli_arg_name = "vcpus"
    remove_first = "vcpus"

    def set_vcpus_cb(self, inst, val, virtarg):
        attrname = (("maxvcpus" in self.optdict) and
                    "curvcpus" or "vcpus")
        setattr(inst, attrname, val)

    def set_cpuset_cb(self, inst, val, virtarg):
        if not val:
            return
        if val != "auto":
            inst.cpuset = val
            return

        # Previously we did our own one-time cpuset placement
        # based on current NUMA memory availability, but that's
        # pretty dumb unless the conditions on the host never change.
        # So instead use newer vcpu placement=, but only if it's
        # supported.
        if not inst.conn.check_support(
                inst.conn.SUPPORT_CONN_VCPU_PLACEMENT):
            logging.warning("vcpu placement=auto not supported, skipping.")
            return

        inst.vcpu_placement = "auto"

    def _parse(self, inst):
        set_from_top = ("maxvcpus" not in self.optdict and
                        "vcpus" not in self.optdict)

        ret = VirtCLIParser._parse(self, inst)

        if set_from_top:
            inst.vcpus = inst.cpu.vcpus_from_topology()
        return ret


_register_virt_parser(ParserVCPU)
ParserVCPU.add_arg("cpu.sockets", "sockets")
ParserVCPU.add_arg("cpu.cores", "cores")
ParserVCPU.add_arg("cpu.threads", "threads")

ParserVCPU.add_arg(None, "vcpus", cb=ParserVCPU.set_vcpus_cb)
ParserVCPU.add_arg("vcpus", "maxvcpus")

ParserVCPU.add_arg(None, "cpuset", can_comma=True, cb=ParserVCPU.set_cpuset_cb)
ParserVCPU.add_arg("vcpu_placement", "placement")


##################
# --boot parsing #
##################

class ParserBoot(VirtCLIParser):
    cli_arg_name = "boot"
    clear_attr = "os"

    def set_uefi(self, inst, val, virtarg):
        ignore = virtarg
        ignore = val
        inst.set_uefi_default()

    def set_initargs_cb(self, inst, val, virtarg):
        inst.os.set_initargs_string(val)

    def noset_cb(self, inst, val, virtarg):
        pass

    def _parse(self, inst):
        # Build boot order
        boot_order = []
        for cliname in self.optdict.keys():
            if cliname not in inst.os.BOOT_DEVICES:
                continue

            del(self.optdict[cliname])
            if cliname not in boot_order:
                boot_order.append(cliname)

        if boot_order:
            inst.os.bootorder = boot_order

        VirtCLIParser._parse(self, inst)


_register_virt_parser(ParserBoot)
# UEFI depends on these bits, so set them first
ParserBoot.add_arg("os.arch", "arch")
ParserBoot.add_arg("type", "domain_type")
ParserBoot.add_arg("os.os_type", "os_type")
ParserBoot.add_arg("emulator", "emulator")
ParserBoot.add_arg(None, "uefi", cb=ParserBoot.set_uefi, is_novalue=True)

ParserBoot.add_arg("os.useserial", "useserial", is_onoff=True)
ParserBoot.add_arg("os.enable_bootmenu", "menu", is_onoff=True)
ParserBoot.add_arg("os.kernel", "kernel")
ParserBoot.add_arg("os.initrd", "initrd")
ParserBoot.add_arg("os.dtb", "dtb")
ParserBoot.add_arg("os.loader", "loader")
ParserBoot.add_arg("os.loader_ro", "loader_ro", is_onoff=True)
ParserBoot.add_arg("os.loader_type", "loader_type")
ParserBoot.add_arg("os.nvram", "nvram")
ParserBoot.add_arg("os.nvram_template", "nvram_template")
ParserBoot.add_arg("os.kernel_args", "kernel_args",
                   aliases=["extra_args"], can_comma=True)
ParserBoot.add_arg("os.init", "init")
ParserBoot.add_arg("os.machine", "machine")
ParserBoot.add_arg("os.initargs", "initargs", cb=ParserBoot.set_initargs_cb)

# This is simply so the boot options are advertised with --boot help,
# actual processing is handled by _parse
for _bootdev in OSXML.BOOT_DEVICES:
    ParserBoot.add_arg(None, _bootdev, is_novalue=True, cb=ParserBoot.noset_cb)


###################
# --idmap parsing #
###################

class ParserIdmap(VirtCLIParser):
    cli_arg_name = "idmap"
    objclass = IdMap

_register_virt_parser(ParserIdmap)
ParserIdmap.add_arg("uid_start", "uid_start")
ParserIdmap.add_arg("uid_target", "uid_target")
ParserIdmap.add_arg("uid_count", "uid_count")
ParserIdmap.add_arg("gid_start", "gid_start")
ParserIdmap.add_arg("gid_target", "gid_target")
ParserIdmap.add_arg("gid_count", "gid_count")


######################
# --security parsing #
######################

class ParserSecurity(VirtCLIParser):
    cli_arg_name = "security"
    objclass = Seclabel

_register_virt_parser(ParserSecurity)
ParserSecurity.add_arg("type", "type")
ParserSecurity.add_arg("model", "model")
ParserSecurity.add_arg("relabel", "relabel", is_onoff=True)
ParserSecurity.add_arg("label", "label", can_comma=True)
ParserSecurity.add_arg("baselabel", "label", can_comma=True)


######################
# --features parsing #
######################

class ParserFeatures(VirtCLIParser):
    cli_arg_name = "features"
    objclass = DomainFeatures

_register_virt_parser(ParserFeatures)
ParserFeatures.add_arg("acpi", "acpi", is_onoff=True)
ParserFeatures.add_arg("apic", "apic", is_onoff=True)
ParserFeatures.add_arg("pae", "pae", is_onoff=True)
ParserFeatures.add_arg("privnet", "privnet", is_onoff=True)
ParserFeatures.add_arg("hap", "hap", is_onoff=True)
ParserFeatures.add_arg("viridian", "viridian", is_onoff=True)
ParserFeatures.add_arg("eoi", "eoi", is_onoff=True)
ParserFeatures.add_arg("pmu", "pmu", is_onoff=True)

ParserFeatures.add_arg("hyperv_vapic", "hyperv_vapic", is_onoff=True)
ParserFeatures.add_arg("hyperv_relaxed", "hyperv_relaxed", is_onoff=True)
ParserFeatures.add_arg("hyperv_spinlocks", "hyperv_spinlocks", is_onoff=True)
ParserFeatures.add_arg("hyperv_spinlocks_retries",
                       "hyperv_spinlocks_retries")

ParserFeatures.add_arg("vmport", "vmport", is_onoff=True)
ParserFeatures.add_arg("kvm_hidden", "kvm_hidden", is_onoff=True)
ParserFeatures.add_arg("pvspinlock", "pvspinlock", is_onoff=True)

ParserFeatures.add_arg("gic_version", "gic_version")


###################
# --clock parsing #
###################

class ParserClock(VirtCLIParser):
    cli_arg_name = "clock"
    objclass = Clock

    def set_timer(self, inst, val, virtarg):
        tname, attrname = virtarg.cliname.split("_")

        timerobj = None
        for t in inst.timers:
            if t.name == tname:
                timerobj = t
                break

        if not timerobj:
            timerobj = inst.add_timer()
            timerobj.name = tname

        setattr(timerobj, attrname, val)


_register_virt_parser(ParserClock)
ParserClock.add_arg("offset", "offset")

for _tname in Clock.TIMER_NAMES:
    ParserClock.add_arg(None, _tname + "_present",
                        is_onoff=True,
                        cb=ParserClock.set_timer)
    ParserClock.add_arg(None, _tname + "_tickpolicy", cb=ParserClock.set_timer)


################
# --pm parsing #
################

class ParserPM(VirtCLIParser):
    cli_arg_name = "pm"
    objclass = PM

_register_virt_parser(ParserPM)
ParserPM.add_arg("suspend_to_mem", "suspend_to_mem", is_onoff=True)
ParserPM.add_arg("suspend_to_disk", "suspend_to_disk", is_onoff=True)


##########################
# Guest <device> parsing #
##########################

def _add_device_address_args(cls):
    """
    Add VirtualDeviceAddress parameters if we are parsing for a device
    """
    cls.add_arg("address.type", "address.type")
    cls.add_arg("address.domain", "address.domain")
    cls.add_arg("address.bus", "address.bus")
    cls.add_arg("address.slot", "address.slot")
    cls.add_arg("address.multifunction", "address.multifunction",
                is_onoff=True)
    cls.add_arg("address.function", "address.function")
    cls.add_arg("address.controller", "address.controller")
    cls.add_arg("address.unit", "address.unit")
    cls.add_arg("address.port", "address.port")
    cls.add_arg("address.target", "address.target")
    cls.add_arg("address.reg", "address.reg")
    cls.add_arg("address.cssid", "address.cssid")
    cls.add_arg("address.ssid", "address.ssid")
    cls.add_arg("address.devno", "address.devno")
    cls.add_arg("address.iobase", "address.iobase")
    cls.add_arg("address.irq", "address.irq")
    cls.add_arg("address.base", "address.base")


##################
# --disk parsing #
##################

def _default_image_file_format(conn):
    if conn.check_support(conn.SUPPORT_CONN_DEFAULT_QCOW2):
        return "qcow2"
    return "raw"


def _get_default_image_format(conn, poolobj):
    tmpvol = StorageVolume(conn)
    tmpvol.pool = poolobj

    if tmpvol.file_type != StorageVolume.TYPE_FILE:
        return None
    return _default_image_file_format(conn)


def _generate_new_volume_name(guest, poolobj, fmt):
    collidelist = []
    for disk in guest.get_devices("disk"):
        if (disk.get_vol_install() and
            disk.get_vol_install().pool.name() == poolobj.name()):
            collidelist.append(os.path.basename(disk.path))

    ext = StorageVolume.get_file_extension_for_format(fmt)
    return StorageVolume.find_free_name(
        poolobj, guest.name, suffix=ext, collidelist=collidelist)


class ParserDisk(VirtCLIParser):
    cli_arg_name = "disk"
    objclass = VirtualDisk
    remove_first = "path"

    def noset_cb(self, inst, val, virtarg):
        ignore = self, inst, val, virtarg

    def _parse(self, inst):
        if self.optstr == "none":
            return

        def parse_size(val):
            if val is None:
                return None
            try:
                return float(val)
            except Exception, e:
                fail(_("Improper value for 'size': %s") % str(e))

        def convert_perms(val):
            if val is None:
                return
            if val == "ro":
                self.optdict["readonly"] = "on"
            elif val == "sh":
                self.optdict["shareable"] = "on"
            elif val == "rw":
                # It's default. Nothing to do.
                pass
            else:
                fail(_("Unknown '%s' value '%s'") % ("perms", val))

        has_path = "path" in self.optdict
        backing_store = self.optdict.pop("backing_store", None)
        poolname = self.optdict.pop("pool", None)
        volname = self.optdict.pop("vol", None)
        size = parse_size(self.optdict.pop("size", None))
        fmt = self.optdict.pop("format", None)
        sparse = _on_off_convert("sparse", self.optdict.pop("sparse", None))
        convert_perms(self.optdict.pop("perms", None))
        has_type_volume = ("source_pool" in self.optdict or
                           "source_volume" in self.optdict)
        has_type_network = ("source_protocol" in self.optdict)

        optcount = sum([bool(p) for p in [has_path, poolname, volname,
                                          has_type_volume, has_type_network]])
        if optcount > 1:
            fail(_("Cannot specify more than 1 storage path"))
        if optcount == 0 and size:
            # Saw something like --disk size=X, have it imply pool=default
            poolname = "default"

        if volname:
            if volname.count("/") != 1:
                raise ValueError(_("Storage volume must be specified as "
                                   "vol=poolname/volname"))
            poolname, volname = volname.split("/")
            logging.debug("Parsed --disk volume as: pool=%s vol=%s",
                          poolname, volname)

        VirtCLIParser._parse(self, inst)

        # Generate and fill in the disk source info
        newvolname = None
        poolobj = None
        if poolname:
            if poolname == "default":
                StoragePool.build_default_pool(self.guest.conn)
            poolobj = self.guest.conn.storagePoolLookupByName(poolname)

        if volname:
            vol_object = poolobj.storageVolLookupByName(volname)
            inst.set_vol_object(vol_object, poolobj)
            poolobj = None

        if ((poolobj or inst.wants_storage_creation()) and
            (fmt or size or sparse or backing_store)):
            if not poolobj:
                poolobj = inst.get_parent_pool()
                newvolname = os.path.basename(inst.path)
            if poolobj and not fmt:
                fmt = _get_default_image_format(self.guest.conn, poolobj)
            if newvolname is None:
                newvolname = _generate_new_volume_name(self.guest, poolobj,
                                                       fmt)
            vol_install = VirtualDisk.build_vol_install(
                    self.guest.conn, newvolname, poolobj, size, sparse,
                    fmt=fmt, backing_store=backing_store)
            inst.set_vol_install(vol_install)

        if not inst.target:
            skip_targets = [d.target for d in self.guest.get_devices("disk")]
            inst.generate_target(skip_targets)
            inst.cli_generated_target = True

        return inst


_register_virt_parser(ParserDisk)
_add_device_address_args(ParserDisk)

# These are all handled specially in _parse
ParserDisk.add_arg(None, "backing_store", cb=ParserDisk.noset_cb)
ParserDisk.add_arg(None, "pool", cb=ParserDisk.noset_cb)
ParserDisk.add_arg(None, "vol", cb=ParserDisk.noset_cb)
ParserDisk.add_arg(None, "size", cb=ParserDisk.noset_cb)
ParserDisk.add_arg(None, "format", cb=ParserDisk.noset_cb)
ParserDisk.add_arg(None, "sparse", cb=ParserDisk.noset_cb)

ParserDisk.add_arg("source_pool", "source_pool")
ParserDisk.add_arg("source_volume", "source_volume")
ParserDisk.add_arg("source_name", "source_name")
ParserDisk.add_arg("source_protocol", "source_protocol")
ParserDisk.add_arg("source_host_name", "source_host_name")
ParserDisk.add_arg("source_host_port", "source_host_port")
ParserDisk.add_arg("source_host_socket", "source_host_socket")
ParserDisk.add_arg("source_host_transport", "source_host_transport")

ParserDisk.add_arg("path", "path")
ParserDisk.add_arg("device", "device")
ParserDisk.add_arg("bus", "bus")
ParserDisk.add_arg("removable", "removable", is_onoff=True)
ParserDisk.add_arg("driver_cache", "cache")
ParserDisk.add_arg("driver_discard", "discard")
ParserDisk.add_arg("driver_name", "driver_name")
ParserDisk.add_arg("driver_type", "driver_type")
ParserDisk.add_arg("driver_io", "io")
ParserDisk.add_arg("error_policy", "error_policy")
ParserDisk.add_arg("serial", "serial")
ParserDisk.add_arg("target", "target")
ParserDisk.add_arg("startup_policy", "startup_policy")
ParserDisk.add_arg("read_only", "readonly", is_onoff=True)
ParserDisk.add_arg("shareable", "shareable", is_onoff=True)
ParserDisk.add_arg("boot.order", "boot_order")

ParserDisk.add_arg("iotune_rbs", "read_bytes_sec")
ParserDisk.add_arg("iotune_wbs", "write_bytes_sec")
ParserDisk.add_arg("iotune_tbs", "total_bytes_sec")
ParserDisk.add_arg("iotune_ris", "read_iops_sec")
ParserDisk.add_arg("iotune_wis", "write_iops_sec")
ParserDisk.add_arg("iotune_tis", "total_iops_sec")
ParserDisk.add_arg("sgio", "sgio")


#####################
# --network parsing #
#####################

class ParserNetwork(VirtCLIParser):
    cli_arg_name = "network"
    objclass = VirtualNetworkInterface
    remove_first = "type"

    def set_mac_cb(self, inst, val, virtarg):
        if val == "RANDOM":
            return None
        inst.macaddr = val
        return val

    def set_type_cb(self, inst, val, virtarg):
        if val == "default":
            inst.set_default_source()
        else:
            inst.type = val

    def set_link_state(self, inst, val, virtarg):
        ignore = virtarg
        if val in ["up", "down"]:
            inst.link_state = val
            return

        ret = _raw_on_off_convert(val)
        if ret is True:
            val = "up"
        elif ret is False:
            val = "down"
        inst.link_state = val

    def _parse(self, inst):
        if self.optstr == "none":
            return

        if "type" not in self.optdict:
            if "network" in self.optdict:
                self.optdict["type"] = VirtualNetworkInterface.TYPE_VIRTUAL
                self.optdict["source"] = self.optdict.pop("network")
            elif "bridge" in self.optdict:
                self.optdict["type"] = VirtualNetworkInterface.TYPE_BRIDGE
                self.optdict["source"] = self.optdict.pop("bridge")

        return VirtCLIParser._parse(self, inst)


_register_virt_parser(ParserNetwork)
_add_device_address_args(ParserNetwork)
ParserNetwork.add_arg("type", "type", cb=ParserNetwork.set_type_cb)
ParserNetwork.add_arg("source", "source")
ParserNetwork.add_arg("source_mode", "source_mode")
ParserNetwork.add_arg("portgroup", "portgroup")
ParserNetwork.add_arg("target_dev", "target")
ParserNetwork.add_arg("model", "model")
ParserNetwork.add_arg("macaddr", "mac", cb=ParserNetwork.set_mac_cb)
ParserNetwork.add_arg("filterref", "filterref")
ParserNetwork.add_arg("boot.order", "boot_order")
ParserNetwork.add_arg("link_state", "link_state",
                      cb=ParserNetwork.set_link_state)

ParserNetwork.add_arg("driver_name", "driver_name")
ParserNetwork.add_arg("driver_queues", "driver_queues")

ParserNetwork.add_arg("rom_file", "rom_file")
ParserNetwork.add_arg("rom_bar", "rom_bar", is_onoff=True)

# For 802.1Qbg
ParserNetwork.add_arg("virtualport.type", "virtualport_type")
ParserNetwork.add_arg("virtualport.managerid", "virtualport_managerid")
ParserNetwork.add_arg("virtualport.typeid", "virtualport_typeid")
ParserNetwork.add_arg("virtualport.typeidversion",
            "virtualport_typeidversion")
ParserNetwork.add_arg("virtualport.instanceid", "virtualport_instanceid")
# For openvswitch & 802.1Qbh
ParserNetwork.add_arg("virtualport.profileid", "virtualport_profileid")
# For openvswitch & midonet
ParserNetwork.add_arg("virtualport.interfaceid", "virtualport_interfaceid")


######################
# --graphics parsing #
######################

class ParserGraphics(VirtCLIParser):
    cli_arg_name = "graphics"
    objclass = VirtualGraphics
    remove_first = "type"

    def set_keymap_cb(self, inst, val, virtarg):
        from . import hostkeymap

        if not val:
            val = None
        elif val.lower() == "local":
            val = VirtualGraphics.KEYMAP_LOCAL
        elif val.lower() == "none":
            val = None
        else:
            use_keymap = hostkeymap.sanitize_keymap(val)
            if not use_keymap:
                raise ValueError(
                    _("Didn't match keymap '%s' in keytable!") % val)
            val = use_keymap
        inst.keymap = val

    def set_type_cb(self, inst, val, virtarg):
        if val == "default":
            return
        inst.type = val

    def set_listen_cb(self, inst, val, virtarg):
        if val == "none":
            inst.set_listen_none()
        elif val == "socket":
            inst.remove_all_listens()
            obj = inst.add_listen()
            obj.type = "socket"
        else:
            inst.listen = val

    def _parse(self, inst):
        if self.optstr == "none":
            self.guest.skip_default_graphics = True
            return

        ret = VirtCLIParser._parse(self, inst)

        if inst.conn.is_qemu() and inst.gl:
            if inst.type != "spice":
                logging.warn("graphics type=%s does not support GL", inst.type)
            elif not inst.conn.check_support(
                    inst.conn.SUPPORT_CONN_SPICE_GL):
                logging.warn("qemu/libvirt version may not support spice GL")

        return ret

_register_virt_parser(ParserGraphics)
_add_device_address_args(ParserGraphics)
ParserGraphics.add_arg(None, "type", cb=ParserGraphics.set_type_cb)
ParserGraphics.add_arg("port", "port")
ParserGraphics.add_arg("tlsPort", "tlsport")
ParserGraphics.add_arg("listen", "listen", cb=ParserGraphics.set_listen_cb)
ParserGraphics.add_arg(None, "keymap", cb=ParserGraphics.set_keymap_cb)
ParserGraphics.add_arg("passwd", "password")
ParserGraphics.add_arg("passwdValidTo", "passwordvalidto")
ParserGraphics.add_arg("connected", "connected")
ParserGraphics.add_arg("defaultMode", "defaultMode")

ParserGraphics.add_arg("image_compression", "image_compression")
ParserGraphics.add_arg("streaming_mode", "streaming_mode")
ParserGraphics.add_arg("clipboard_copypaste", "clipboard_copypaste",
            is_onoff=True)
ParserGraphics.add_arg("mouse_mode", "mouse_mode")
ParserGraphics.add_arg("filetransfer_enable", "filetransfer_enable",
            is_onoff=True)
ParserGraphics.add_arg("gl", "gl", is_onoff=True)


########################
# --controller parsing #
########################

class ParserController(VirtCLIParser):
    cli_arg_name = "controller"
    objclass = VirtualController
    remove_first = "type"

    def set_server_cb(self, inst, val, virtarg):
        inst.address.set_addrstr(val)

    def _parse(self, inst):
        if self.optstr == "usb2":
            return VirtualController.get_usb2_controllers(inst.conn)
        elif self.optstr == "usb3":
            inst.type = "usb"
            inst.model = "nec-xhci"
            return inst
        return VirtCLIParser._parse(self, inst)


_register_virt_parser(ParserController)
_add_device_address_args(ParserController)
ParserController.add_arg("type", "type")
ParserController.add_arg("model", "model")
ParserController.add_arg("index", "index")
ParserController.add_arg("master_startport", "master")

ParserController.add_arg(None, "address", cb=ParserController.set_server_cb)


###################
# --input parsing #
###################

class ParserInput(VirtCLIParser):
    cli_arg_name = "input"
    objclass = VirtualInputDevice
    remove_first = "type"

_register_virt_parser(ParserInput)
_add_device_address_args(ParserInput)
ParserInput.add_arg("type", "type")
ParserInput.add_arg("bus", "bus")


#######################
# --smartcard parsing #
#######################

class ParserSmartcard(VirtCLIParser):
    cli_arg_name = "smartcard"
    objclass = VirtualSmartCardDevice
    remove_first = "mode"
    check_none = True

_register_virt_parser(ParserSmartcard)
_add_device_address_args(ParserSmartcard)
ParserSmartcard.add_arg("mode", "mode")
ParserSmartcard.add_arg("type", "type")


######################
# --redirdev parsing #
######################

class ParserRedir(VirtCLIParser):
    cli_arg_name = "redirdev"
    objclass = VirtualRedirDevice
    remove_first = "bus"

    def set_server_cb(self, inst, val, virtarg):
        inst.parse_friendly_server(val)

    def _parse(self, inst):
        if self.optstr == "none":
            self.guest.skip_default_usbredir = True
            return
        return VirtCLIParser._parse(self, inst)

_register_virt_parser(ParserRedir)
_add_device_address_args(ParserRedir)
ParserRedir.add_arg("bus", "bus")
ParserRedir.add_arg("type", "type")
ParserRedir.add_arg("boot.order", "boot_order")
ParserRedir.add_arg(None, "server", cb=ParserRedir.set_server_cb)


#################
# --tpm parsing #
#################

class ParserTPM(VirtCLIParser):
    cli_arg_name = "tpm"
    objclass = VirtualTPMDevice
    remove_first = "type"
    check_none = True

    def _parse(self, inst):
        if (self.optdict.get("type", "").startswith("/")):
            self.optdict["path"] = self.optdict.pop("type")
        return VirtCLIParser._parse(self, inst)

_register_virt_parser(ParserTPM)
_add_device_address_args(ParserTPM)
ParserTPM.add_arg("type", "type")
ParserTPM.add_arg("model", "model")
ParserTPM.add_arg("device_path", "path")


#################
# --rng parsing #
#################

class ParserRNG(VirtCLIParser):
    cli_arg_name = "rng"
    objclass = VirtualRNGDevice
    remove_first = "type"
    check_none = True

    def set_hosts_cb(self, inst, val, virtarg):
        namemap = {}
        inst.backend_type = inst.cli_backend_type

        if inst.cli_backend_mode == "connect":
            namemap["backend_host"] = "connect_host"
            namemap["backend_service"] = "connect_service"

        if inst.cli_backend_mode == "bind":
            namemap["backend_host"] = "bind_host"
            namemap["backend_service"] = "bind_service"

            if inst.cli_backend_type == "udp":
                namemap["backend_connect_host"] = "connect_host"
                namemap["backend_connect_service"] = "connect_service"

        if virtarg.cliname in namemap:
            setattr(inst, namemap[virtarg.cliname], val)

    def set_backend_cb(self, inst, val, virtarg):
        if virtarg.cliname == "backend_mode":
            inst.cli_backend_mode = val
        elif virtarg.cliname == "backend_type":
            inst.cli_backend_type = val

    def _parse(self, inst):
        inst.cli_backend_mode = "connect"
        inst.cli_backend_type = "udp"

        if self.optdict.get("type", "").startswith("/"):
            # Allow --rng /dev/random
            self.optdict["device"] = self.optdict.pop("type")
            self.optdict["type"] = "random"

        return VirtCLIParser._parse(self, inst)


_register_virt_parser(ParserRNG)
_add_device_address_args(ParserRNG)
ParserRNG.add_arg("type", "type")

ParserRNG.add_arg(None, "backend_mode", cb=ParserRNG.set_backend_cb)
ParserRNG.add_arg(None, "backend_type", cb=ParserRNG.set_backend_cb)

ParserRNG.add_arg(None, "backend_host", cb=ParserRNG.set_hosts_cb)
ParserRNG.add_arg(None, "backend_service", cb=ParserRNG.set_hosts_cb)
ParserRNG.add_arg(None, "backend_connect_host", cb=ParserRNG.set_hosts_cb)
ParserRNG.add_arg(None, "backend_connect_service", cb=ParserRNG.set_hosts_cb)

ParserRNG.add_arg("device", "device")
ParserRNG.add_arg("model", "model")
ParserRNG.add_arg("rate_bytes", "rate_bytes")
ParserRNG.add_arg("rate_period", "rate_period")


######################
# --watchdog parsing #
######################

class ParserWatchdog(VirtCLIParser):
    cli_arg_name = "watchdog"
    objclass = VirtualWatchdog
    remove_first = "model"

_register_virt_parser(ParserWatchdog)
_add_device_address_args(ParserWatchdog)
ParserWatchdog.add_arg("model", "model")
ParserWatchdog.add_arg("action", "action")


########################
# --memballoon parsing #
########################

class ParserMemballoon(VirtCLIParser):
    cli_arg_name = "memballoon"
    objclass = VirtualMemballoon
    remove_first = "model"

_register_virt_parser(ParserMemballoon)
_add_device_address_args(ParserMemballoon)
ParserMemballoon.add_arg("model", "model")


###################
# --panic parsing #
###################

class ParserPanic(VirtCLIParser):
    cli_arg_name = "panic"
    objclass = VirtualPanicDevice
    remove_first = "iobase"

    def set_iobase_cb(self, inst, val, virtarg):
        if val == "default":
            return
        inst.iobase = val

_register_virt_parser(ParserPanic)
_add_device_address_args(ParserPanic)
ParserPanic.add_arg(None, "iobase", cb=ParserPanic.set_iobase_cb)


######################################################
# --serial, --parallel, --channel, --console parsing #
######################################################

class _ParserChar(VirtCLIParser):
    remove_first = "char_type"

    def support_check(self, inst, virtarg):
        if type(virtarg.attrname) is not str:
            return
        if not inst.supports_property(virtarg.attrname):
            raise ValueError(_("%(devtype)s type '%(chartype)s' does not "
                "support '%(optname)s' option.") %
                {"devtype" : inst.virtual_device_type,
                 "chartype": inst.type,
                 "optname" : virtarg.cliname})
    support_cb = support_check

    def set_host_cb(self, inst, val, virtarg):
        if ("bind_host" not in self.optdict and
            self.optdict.get("mode", None) == "bind"):
            inst.set_friendly_bind(val)
        else:
            inst.set_friendly_source(val)

    def set_bind_cb(self, inst, val, virtarg):
        inst.set_friendly_bind(val)

    def set_target_cb(self, inst, val, virtarg):
        inst.set_friendly_target(val)

    def _parse(self, inst):
        if self.optstr == "none" and inst.virtual_device_type == "console":
            self.guest.skip_default_console = True
            return
        if self.optstr == "none" and inst.virtual_device_type == "channel":
            self.guest.skip_default_channel = True
            return

        return VirtCLIParser._parse(self, inst)


_add_device_address_args(_ParserChar)
_ParserChar.add_arg("type", "char_type")
_ParserChar.add_arg("source_path", "path")
_ParserChar.add_arg("protocol",   "protocol")
_ParserChar.add_arg("target_type", "target_type")
_ParserChar.add_arg("target_name", "name")
_ParserChar.add_arg(None, "host", cb=_ParserChar.set_host_cb)
_ParserChar.add_arg(None, "bind_host", cb=_ParserChar.set_bind_cb)
_ParserChar.add_arg(None, "target_address", cb=_ParserChar.set_target_cb)
_ParserChar.add_arg("source_mode", "mode")



class ParserSerial(_ParserChar):
    cli_arg_name = "serial"
    objclass = VirtualSerialDevice
_register_virt_parser(ParserSerial)


class ParserParallel(_ParserChar):
    cli_arg_name = "parallel"
    objclass = VirtualParallelDevice
_register_virt_parser(ParserParallel)


class ParserChannel(_ParserChar):
    cli_arg_name = "channel"
    objclass = VirtualChannelDevice
_register_virt_parser(ParserChannel)


class ParserConsole(_ParserChar):
    cli_arg_name = "console"
    objclass = VirtualConsoleDevice
_register_virt_parser(ParserConsole)


########################
# --filesystem parsing #
########################

class ParserFilesystem(VirtCLIParser):
    cli_arg_name = "filesystem"
    objclass = VirtualFilesystem
    remove_first = ["source", "target"]

_register_virt_parser(ParserFilesystem)
_add_device_address_args(ParserFilesystem)
ParserFilesystem.add_arg("type", "type")
ParserFilesystem.add_arg("accessmode", "accessmode", aliases=["mode"])
ParserFilesystem.add_arg("source", "source")
ParserFilesystem.add_arg("target", "target")


###################
# --video parsing #
###################

class ParserVideo(VirtCLIParser):
    cli_arg_name = "video"
    objclass = VirtualVideoDevice
    remove_first = "model"

    def _parse(self, inst):
        ret = VirtCLIParser._parse(self, inst)

        if inst.conn.is_qemu() and inst.accel3d:
            if inst.model != "virtio":
                logging.warn("video model=%s does not support accel3d",
                    inst.model)
            elif not inst.conn.check_support(
                    inst.conn.SUPPORT_CONN_VIDEO_VIRTIO_ACCEL3D):
                logging.warn("qemu/libvirt version may not support "
                             "virtio accel3d")

        return ret

_register_virt_parser(ParserVideo)
_add_device_address_args(ParserVideo)
ParserVideo.add_arg("model", "model", ignore_default=True)
ParserVideo.add_arg("accel3d", "accel3d", is_onoff=True)
ParserVideo.add_arg("heads", "heads")
ParserVideo.add_arg("ram", "ram")
ParserVideo.add_arg("vram", "vram")
ParserVideo.add_arg("vgamem", "vgamem")


###################
# --sound parsing #
###################

class ParserSound(VirtCLIParser):
    cli_arg_name = "sound"
    objclass = VirtualAudio
    remove_first = "model"

    def _parse(self, inst):
        if self.optstr == "none":
            self.guest.skip_default_sound = True
            return
        return VirtCLIParser._parse(self, inst)

_register_virt_parser(ParserSound)
_add_device_address_args(ParserSound)
ParserSound.add_arg("model", "model", ignore_default=True)


#####################
# --hostdev parsing #
#####################

class ParserHostdev(VirtCLIParser):
    cli_arg_name = "hostdev"
    objclass = VirtualHostDevice
    remove_first = "name"

    def set_name_cb(self, inst, val, virtarg):
        val = NodeDevice.lookupNodedevFromString(inst.conn, val)
        inst.set_from_nodedev(val)

    def name_lookup_cb(self, inst, val, virtarg):
        nodedev = NodeDevice.lookupNodedevFromString(inst.conn, val)
        return nodedev.compare_to_hostdev(inst)

_register_virt_parser(ParserHostdev)
_add_device_address_args(ParserHostdev)
ParserHostdev.add_arg(None, "name",
                      cb=ParserHostdev.set_name_cb,
                      lookup_cb=ParserHostdev.name_lookup_cb)
ParserHostdev.add_arg("driver_name", "driver_name")
ParserHostdev.add_arg("boot.order", "boot_order")
ParserHostdev.add_arg("rom_bar", "rom_bar", is_onoff=True)


###########################
# Public virt parser APIs #
###########################

def parse_option_strings(options, guest, instlist, update=False):
    """
    Iterate over VIRT_PARSERS, and launch the associated parser
    function for every value that was filled in on 'options', which
    came from argparse/the command line.

    @update: If we are updating an existing guest, like from virt-xml
    """
    instlist = util.listify(instlist)
    if not instlist:
        instlist = [None]

    ret = []
    for parserclass in VIRT_PARSERS:
        optlist = util.listify(getattr(options, parserclass.cli_arg_name))
        if not optlist:
            continue

        for inst in instlist:
            if inst and optlist:
                # If an object is passed in, we are updating it in place, and
                # only use the last command line occurrence, eg. from virt-xml
                optlist = [optlist[-1]]

            for optstr in optlist:
                parserobj = parserclass(guest, optstr)
                parseret = parserobj.parse(inst, validate=not update)
                ret += util.listify(parseret)

    return ret


def check_option_introspection(options):
    """
    Check if the user requested option introspection with ex: '--disk=?'
    """
    ret = False
    for parserclass in VIRT_PARSERS:
        optlist = util.listify(getattr(options, parserclass.cli_arg_name))
        if not optlist:
            continue

        for optstr in optlist:
            if optstr == "?" or optstr == "help":
                parserclass.print_introspection()
                ret = True

    return ret