#!/usr/bin/python2 -tt
#
# Copyright 2005-2014 Red Hat, Inc.
#
# 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 logging
import re
import sys
import time

import libvirt
import urlgrabber.progress as progress

import virtinst
import virtinst.cli as cli
from virtinst.cli import fail, print_stdout, print_stderr


##############################
# Validation utility helpers #
##############################

install_methods = "--location URL, --cdrom CD/ISO, --pxe, --import, --boot hd|cdrom|..."
install_missing = (_("An install method must be specified\n(%(methods)s)") %
                   {"methods" : install_methods})
disk_missing = _("--disk storage must be specified (override with --nodisks)")


def install_specified(location, cdpath, pxe, import_install):
    return bool(pxe or cdpath or location or import_install)


def cdrom_specified(guest, disk=None):
    disks = guest.get_devices("disk")

    for disk in disks:
        if disk.device == virtinst.VirtualDisk.DEVICE_CDROM:
            return True

    # Probably haven't set up disks yet
    if not disks and disk:
        for opts in disk:
            if opts.count("device=cdrom"):
                return True

    return False


def storage_specified(disks, nodisks, filesystems):
    return bool(disks or nodisks or filesystems)


def supports_pxe(guest):
    """
    Return False if we are pretty sure the config doesn't support PXE
    """
    for nic in guest.get_devices("interface"):
        if nic.type == nic.TYPE_USER:
            continue
        if nic.type != nic.TYPE_VIRTUAL:
            return True

        try:
            netobj = nic.conn.networkLookupByName(nic.source)
            xmlobj = virtinst.Network(nic.conn, parsexml=netobj.XMLDesc(0))
            if xmlobj.can_pxe():
                return True
        except:
            logging.debug("Error checking if PXE supported", exc_info=True)
            return True

    return False


def check_cdrom_option_error(options):
    if options.cdrom_short and options.cdrom:
        fail("Cannot specify both -c and --cdrom")

    if options.cdrom_short:
        if "://" in options.cdrom_short:
            fail("-c specified with what looks like a URI. Did you mean "
                 "to use --connect? If not, use --cdrom instead")
        options.cdrom = options.cdrom_short

    if not options.cdrom:
        return

    # Catch a strangely common error of users passing -vcpus=2 instead of
    # --vcpus=2. The single dash happens to map to enough shortened options
    # that things can fail weirdly if --paravirt is also specified.
    for vcpu in [o for o in sys.argv if o.startswith("-vcpu")]:
        if options.cdrom == vcpu[3:]:
            fail("You specified -vcpus, you want --vcpus")


##############################
# Device validation wrappers #
##############################

def convert_old_sound(options):
    if not options.sound:
        return
    for idx in range(len(options.sound)):
        if options.sound[idx] is None:
            options.sound[idx] = "default"


def convert_old_init(options):
    if not options.init:
        return
    if not options.boot:
        options.boot = ""
    options.boot += ",init=%s" % options.init
    logging.debug("Converted old --init to --boot %s", options.boot)


def convert_old_disks(options):
    if options.disk or options.nodisks:
        return

    paths = virtinst.util.listify(options.file_paths)
    sizes = virtinst.util.listify(options.disksize)

    def padlist(l, padsize):
        l = virtinst.util.listify(l)
        l.extend((padsize - len(l)) * [None])
        return l

    disklist = padlist(paths, max(0, len(sizes)))
    sizelist = padlist(sizes, len(disklist))

    opts = []
    for idx in range(len(disklist)):
        optstr = ""
        if disklist[idx]:
            optstr += "path=%s" % disklist[idx]
        if sizelist[idx]:
            if optstr:
                optstr += ","
            optstr += "size=%s" % sizelist[idx]
        if options.sparse is False:
            if optstr:
                optstr += ","
            optstr += "sparse=no"
        logging.debug("Converted to new style: --disk %s", optstr)
        opts.append(optstr)

    options.disk = opts
    options.file_paths = []
    options.disksize = None
    options.sparse = True


########################
# Virt type validation #
########################

def get_guest(conn, options):
    # Set up all virt/hypervisor parameters
    if sum([bool(f) for f in [options.fullvirt,
                              options.paravirt,
                              options.container]]) > 1:
        fail(_("Can't do more than one of --hvm, --paravirt, or --container"))

    req_hv_type = options.hv_type and options.hv_type.lower() or None
    if options.fullvirt:
        req_virt_type = "hvm"
    elif options.paravirt:
        req_virt_type = "xen"
    elif options.container:
        req_virt_type = "exe"
    else:
        # This should force capabilities to give us the most sensible default
        req_virt_type = None

    logging.debug("Requesting virt method '%s', hv type '%s'.",
                  (req_virt_type and req_virt_type or _("default")),
                  (req_hv_type and req_hv_type or _("default")))

    arch = options.arch
    if re.match("i.86", arch or ""):
        arch = "i686"

    try:
        (capsguest,
         capsdomain) = conn.caps.guest_lookup(
                        os_type=req_virt_type,
                        arch=arch,
                        typ=req_hv_type,
                        machine=options.machine)
        guest = conn.caps.build_virtinst_guest(conn, capsguest, capsdomain)
        guest.os.machine = options.machine
    except Exception, e:
        fail(e)

    if (not req_virt_type and
        not req_hv_type and
        conn.is_qemu() and
        capsguest.arch in ["i686", "x86_64"] and
        not capsdomain.is_accelerated()):
        logging.warn("KVM acceleration not available, using '%s'",
                     capsdomain.hypervisor_type)

    return guest


##################################
# Install media setup/validation #
##################################

def get_install_media(guest, location, cdpath):
    manual_cdrom = cdrom_specified(guest)
    cdinstall = bool(not location and (cdpath or cdrom_specified(guest)))

    if not (location or cdpath or manual_cdrom):
        return

    try:
        validate_install_media(guest, location, cdpath, cdinstall)
    except ValueError, e:
        fail(_("Error validating install location: %s" % str(e)))


def validate_install_media(guest, location, cdpath, cdinstall=False):
    if cdinstall or cdpath:
        guest.installer.cdrom = True
    if location or cdpath:
        guest.installer.location = (location or cdpath)
    guest.installer.check_location(guest)


#############################
# General option validation #
#############################

def validate_required_options(options, guest):
    # Required config. Don't error right away if nothing is specified,
    # aggregate the errors to help first time users get it right
    msg = ""

    if not options.name:
        msg += "\n" + cli.name_missing

    if not options.memory:
        msg += "\n" + _("--memory amount in MB is required")

    if (not guest.os.is_container() and
        not storage_specified(options.disk,
                              options.nodisks,
                              options.filesystem)):
        msg += "\n" + disk_missing

    if (not guest.os.is_container() and
        (not install_specified(options.location, options.cdrom,
                               options.pxe, options.import_install)) and
        (not cdrom_specified(guest, options.disk))):
        msg += "\n" + install_missing

    if msg:
        fail(msg)


def check_option_collisions(options, guest):
    # Disk collisions
    if options.nodisks and (options.file_paths or
                            options.disk or
                            options.disksize):
        fail(_("Cannot specify storage and use --nodisks"))

    if ((options.file_paths or options.disksize or not options.sparse) and
        options.disk):
        fail(_("Cannot mix --file, --nonsparse, or --file-size with --disk "
               "options. Use --disk PATH[,size=SIZE][,sparse=yes|no]"))

    # Network collisions
    if options.nonetworks:
        if options.mac:
            fail(_("Cannot use --mac with --nonetworks"))
        if options.bridge:
            fail(_("Cannot use --bridge with --nonetworks"))
        if options.network:
            fail(_("Cannot use --network with --nonetworks"))
        return

    # Install collisions
    if sum([bool(l) for l in [options.pxe, options.location,
                      options.cdrom, options.import_install]]) > 1:
        fail(_("Only one install method can be used (%(methods)s)") %
             {"methods" : install_methods})

    if (guest.os.is_container() and
        install_specified(options.location, options.cdrom,
                          options.pxe, options.import_install)):
        fail(_("Install methods (%s) cannot be specified for "
               "container guests") % install_methods)

    if guest.os.is_xenpv():
        if options.pxe:
            fail(_("Network PXE boot is not supported for paravirtualized "
                   "guests"))
        if options.cdrom or options.livecd:
            fail(_("Paravirtualized guests cannot install off cdrom media."))

    if (options.location and
        guest.conn.is_remote() and not
        guest.conn.support_remote_url_install()):
        fail(_("Libvirt version does not support remote --location installs"))

    cdrom_err = ""
    if guest.installer.cdrom:
        cdrom_err = " " + _("See the man page for examples of "
            "using --location with CDROM media")
    if not options.location and options.extra_args:
        fail(_("--extra-args only work if specified with --location.") +
             cdrom_err)
    if not options.location and options.initrd_inject:
        fail(_("--initrd-inject only works if specified with --location.") +
             cdrom_err)


def _show_nographics_warnings(options, guest):
    if guest.get_devices("graphics"):
        return
    if not options.autoconsole:
        return

    if guest.installer.cdrom:
        logging.warn(_("CDROM media does not print to the text console "
            "by default, so you likely will not see text install output. "
            "You might want to use --location."))
        return

    if not options.location:
        return

    # Trying --location --nographics with console connect. Warn if
    # they likely won't see any output.

    if not guest.get_devices("console"):
        logging.warn(_("No --console device added, you likely will not "
            "see text install output from the guest."))
        return

    serial_arg = "console=ttyS0"
    virtio_arg = "console=hvc0"
    console_type = None
    if guest.conn.is_test() or guest.conn.is_qemu():
        console_type = serial_arg
        if guest.get_devices("console")[0].target_type == "virtio":
            console_type = virtio_arg

    if not options.extra_args or "console=" not in options.extra_args:
        logging.warn(_("No 'console' seen in --extra-args, a '%s' kernel "
            "argument is likely required to see text install output from "
            "the guest."), console_type or "console=")
        return

    if console_type in options.extra_args:
        return
    if (serial_arg not in options.extra_args and
        virtio_arg not in options.extra_args):
        return

    has = (serial_arg in options.extra_args) and serial_arg or virtio_arg
    need = (serial_arg in options.extra_args) and virtio_arg or serial_arg
    logging.warn(_("'%s' found in --extra-args, but the device attached "
        "to the guest likely requires '%s'. You may not see text install "
        "output from the guest."), has, need)
    if has == serial_arg:
        logging.warn(_("To make '--extra-args %s' work, you can force a "
            "plain serial device with '--console pty'"), serial_arg)


def show_warnings(options, guest):
    if options.pxe and not supports_pxe(guest):
        logging.warn(_("The guest's network configuration does not support "
                       "PXE"))

    _show_nographics_warnings(options, guest)


##########################
# Guest building helpers #
##########################

def build_installer(options, conn, virt_type):
    # Build the Installer instance
    if options.livecd:
        instclass = virtinst.LiveCDInstaller
    elif options.pxe:
        if options.nonetworks:
            fail(_("Can't use --pxe with --nonetworks"))

        instclass = virtinst.PXEInstaller
    elif options.cdrom or options.location:
        instclass = virtinst.DistroInstaller
    elif virt_type == "exe":
        instclass = virtinst.ContainerInstaller
    elif options.import_install or options.boot:
        if options.import_install and options.nodisks:
            fail(_("A disk device must be specified with --import."))
        options.import_install = True
        instclass = virtinst.ImportInstaller
    else:
        instclass = virtinst.DistroInstaller

    # Only set installer params here that impact the hw config, not
    # anything to do with install media
    installer = instclass(conn)

    return installer


def build_guest_instance(conn, options, parsermap):
    guest = get_guest(conn, options)

    logging.debug("Received virt method '%s'", guest.type)
    logging.debug("Hypervisor name is '%s'", guest.os.os_type)

    guest.installer = build_installer(options, conn, guest.os.os_type)

    cli.convert_old_memory(options)
    convert_old_sound(options)
    cli.convert_old_networks(options, not options.nonetworks and 1 or 0)
    cli.convert_old_graphics(guest, options)
    convert_old_disks(options)
    cli.convert_old_features(options)
    cli.convert_old_cpuset(options)
    convert_old_init(options)

    # non-xml install options
    guest.installer.extraargs = options.extra_args
    guest.installer.initrd_injections = options.initrd_inject
    cli.set_os_variant(guest, options.distro_type, options.distro_variant)
    guest.autostart = options.autostart

    if options.name:
        guest.name = options.name
    if options.uuid:
        guest.uuid = options.uuid
    if options.description:
        guest.description = options.description

    validate_required_options(options, guest)

    # We don't want to auto-parse --disk, but we wanted it for earlier
    # parameter introspection
    cli.parse_option_strings(parsermap, options, guest, None)

    # Extra disk validation
    for disk in guest.get_devices("disk"):
        cli.validate_disk(disk)

    guest.add_default_devices()

    get_install_media(guest, options.location, options.cdrom)

    # Various little validations about option collisions. Need to do
    # this after setting guest.installer at least
    check_option_collisions(options, guest)

    show_warnings(options, guest)

    return guest


###########################
# Install process helpers #
###########################

def domain_is_crashed(domain):
    """
    Return True if the created domain object is in a crashed state
    """
    if not domain:
        return False

    dominfo = domain.info()
    state = dominfo[0]

    return state == libvirt.VIR_DOMAIN_CRASHED


def domain_is_shutdown(domain):
    """
    Return True if the created domain object is shutdown
    """
    if not domain:
        return False

    dominfo = domain.info()

    state    = dominfo[0]
    cpu_time = dominfo[4]

    if state == libvirt.VIR_DOMAIN_SHUTOFF:
        return True

    # If 'wait' was specified, the dom object we have was looked up
    # before initially shutting down, which seems to bogus up the
    # info data (all 0's). So, if it is bogus, assume the domain is
    # shutdown. We will catch the error later.
    return state == libvirt.VIR_DOMAIN_NOSTATE and cpu_time == 0


def start_install(guest, continue_inst, options):
    # There are two main cases we care about:
    #
    # Scripts: these should specify --wait always, maintaining the
    # semantics of virt-install exit implying the domain has finished
    # installing.
    #
    # Interactive: If this is a continue_inst domain, we default to
    # waiting.  Otherwise, we can exit before the domain has finished
    # installing. Passing --wait will give the above semantics.
    #
    wait_on_install = continue_inst
    wait_time = -1
    if options.wait is not None:
        wait_on_install = True
        wait_time = options.wait * 60

    # If --wait specified, we don't want the default behavior of waiting
    # for virt-viewer to exit, since then we can't exit the app when time
    # expires
    wait_on_console = not wait_on_install

    # --wait 0 implies --noautoconsole
    options.autoconsole = (wait_time != 0) and options.autoconsole or False

    conscb = options.autoconsole and cli.show_console_for_guest or None
    meter = (options.quiet and
             progress.BaseMeter() or
             progress.TextMeter(fo=sys.stdout))
    logging.debug("Guest.has_install_phase: %s",
                  guest.installer.has_install_phase())

    # we've got everything -- try to start the install
    print_stdout(_("\nStarting install..."))

    try:
        start_time = time.time()

        # Do first install phase
        dom = guest.start_install(meter=meter, noboot=options.noreboot)
        cli.connect_console(guest, conscb, wait_on_console)
        dom = check_domain(guest, dom, conscb,
                           wait_on_install, wait_time, start_time)

        if continue_inst:
            dom = guest.continue_install(meter=meter)
            cli.connect_console(guest, conscb, wait_on_console)
            dom = check_domain(guest, dom, conscb,
                               wait_on_install, wait_time, start_time)

        if options.noreboot or not guest.installer.has_install_phase():
            print_stdout(
            _("Domain creation completed. You can restart your domain by "
              "running:\n  %s") % cli.virsh_start_cmd(guest))
        else:
            print_stdout(
                _("Guest installation complete... restarting guest."))
            dom.create()
            cli.connect_console(guest, conscb, True)

    except KeyboardInterrupt:
        logging.debug("", exc_info=True)
        print_stderr(_("Domain install interrupted."))
        raise
    except RuntimeError, e:
        fail(e)
    except Exception, e:
        fail(e, do_exit=False)
        cli.install_fail(guest)


def check_domain(guest, dom, conscb, wait_for_install, wait_time, start_time):
    """
    Make sure domain ends up in expected state, and wait if for install
    to complete if requested
    """
    wait_forever = (wait_time < 0)

    # Wait a bit so info is accurate
    def check_domain_state():
        dominfo = dom.info()
        state = dominfo[0]

        if domain_is_crashed(guest.domain):
            fail(_("Domain has crashed."))

        if domain_is_shutdown(guest.domain):
            return dom, state

        return None, state

    do_sleep = bool(conscb)
    try:
        ret, state = check_domain_state()
        if ret:
            return ret
    except Exception, e:
        # Sometimes we see errors from libvirt here due to races
        logging.exception(e)
        do_sleep = True

    if do_sleep:
        # Sleep a bit and try again to be sure the HV has caught up
        time.sleep(2)

    ret, state = check_domain_state()
    if ret:
        return ret

    # Domain seems to be running
    logging.debug("Domain state after install: %s", state)

    if not wait_for_install or wait_time == 0:
        # User either:
        #   used --noautoconsole
        #   used --wait 0
        #   killed console and guest is still running
        if not guest.installer.has_install_phase():
            return dom

        print_stdout(
            _("Domain installation still in progress. You can reconnect"
              " to \nthe console to complete the installation process."))
        sys.exit(0)

    timestr = (not wait_forever and
               _("%d minutes ") % (int(wait_time) / 60) or "")
    print_stdout(
        _("Domain installation still in progress. Waiting "
          "%(time_string)s for installation to complete.") %
        {"time_string": timestr})

    # Wait loop
    while True:
        if domain_is_shutdown(guest.domain):
            print_stdout(_("Domain has shutdown. Continuing."))
            try:
                # Lookup a new domain object incase current
                # one returned bogus data (see comment in
                # domain_is_shutdown)
                dom = guest.conn.lookupByName(guest.name)
            except Exception, e:
                raise RuntimeError(_("Could not lookup domain after "
                                     "install: %s" % str(e)))
            break

        time_elapsed = (time.time() - start_time)
        if not wait_forever and time_elapsed >= wait_time:
            print_stdout(
                _("Installation has exceeded specified time limit. "
                        "Exiting application."))
            sys.exit(1)

        time.sleep(2)

    return dom


########################
# XML printing helpers #
########################

def xml_to_print(guest, continue_inst, xmlonly, xmlstep, dry):
    start_xml, final_xml = guest.start_install(dry=dry, return_xml=True)
    second_xml = None
    if not start_xml:
        start_xml = final_xml
        final_xml = None

    if continue_inst:
        second_xml, final_xml = guest.continue_install(dry=dry,
                                                       return_xml=True)

    if dry and not (xmlonly or xmlstep):
        print_stdout(_("Dry run completed successfully"))
        return

    # --print-xml
    if xmlonly and not xmlstep:
        if second_xml or final_xml:
            fail(_("--print-xml can only be used with guests that do not have "
                   "an installation phase (--import, --boot, etc.). To see all"
                   " generated XML, please use --print-step all."))
        return start_xml

    # --print-step
    if xmlstep == "1":
        return start_xml
    if xmlstep == "2":
        if not (second_xml or final_xml):
            fail(_("Requested installation does not have XML step 2"))
        return second_xml or final_xml
    if xmlstep == "3":
        if not second_xml:
            fail(_("Requested installation does not have XML step 3"))
        return final_xml

    # "all" case
    xml = start_xml
    if second_xml:
        xml += second_xml
    if final_xml:
        xml += final_xml
    return xml


#######################
# CLI option handling #
#######################

def parse_args():
    parser = cli.setupParser(
        "%(prog)s --name NAME --ram RAM STORAGE INSTALL [options]",
        _("Create a new virtual machine from specified install media."),
        introspection_epilog=True)
    cli.add_connect_option(parser)

    geng = parser.add_argument_group(_("General Options"))
    geng.add_argument("-n", "--name",
                    help=_("Name of the guest instance"))
    cli.add_memory_option(geng, backcompat=True)
    cli.vcpu_cli_options(geng)
    cli.add_metadata_option(geng)
    geng.add_argument("-u", "--uuid", help=argparse.SUPPRESS)
    geng.add_argument("--description", help=argparse.SUPPRESS)
    cli.add_guest_xml_options(geng)

    insg = parser.add_argument_group(_("Installation Method Options"))
    insg.add_argument("-c", dest="cdrom_short", help=argparse.SUPPRESS)
    insg.add_argument("--cdrom", help=_("CD-ROM installation media"))
    insg.add_argument("-l", "--location",
                    help=_("Installation source (eg, nfs:host:/path, "
                           "http://host/path, ftp://host/path)"))
    insg.add_argument("--pxe", action="store_true",
                    help=_("Boot from the network using the PXE protocol"))
    insg.add_argument("--import", action="store_true", dest="import_install",
                    help=_("Build guest around an existing disk image"))
    insg.add_argument("--livecd", action="store_true",
                    help=_("Treat the CD-ROM media as a Live CD"))
    insg.add_argument("-x", "--extra-args",
                    help=_("Additional arguments to pass to the install kernel "
                           "booted from --location"))
    insg.add_argument("--initrd-inject", action="append",
                    help=_("Add given file to root of initrd from --location"))
    cli.add_distro_options(insg)
    cli.add_boot_options(insg)
    insg.add_argument("--init", help=argparse.SUPPRESS)

    stog = parser.add_argument_group(_("Storage Configuration"))
    cli.add_disk_option(stog)
    stog.add_argument("--nodisks", action="store_true",
                    help=_("Don't set up any disks for the guest."))
    cli.add_fs_option(stog)

    # Deprecated storage options
    stog.add_argument("-f", "--file", dest="file_paths", action="append",
                    help=argparse.SUPPRESS)
    stog.add_argument("-s", "--file-size", type=float,
                    action="append", dest="disksize",
                    help=argparse.SUPPRESS)
    stog.add_argument("--nonsparse", action="store_false",
                    default=True, dest="sparse",
                    help=argparse.SUPPRESS)

    netg = cli.network_option_group(parser)

    netg.add_argument("--nonetworks", action="store_true",
                    help=_("Don't create network interfaces for the guest."))

    cli.graphics_option_group(parser)

    devg = parser.add_argument_group(_("Device Options"))
    cli.add_device_options(devg, sound_back_compat=True)

    virg = parser.add_argument_group(_("Virtualization Platform Options"))
    virg.add_argument("-v", "--hvm", action="store_true", dest="fullvirt",
                      help=_("This guest should be a fully virtualized guest"))
    virg.add_argument("-p", "--paravirt", action="store_true",
                    help=_("This guest should be a paravirtualized guest"))
    virg.add_argument("--container", action="store_true", default=False,
                    help=_("This guest should be a container guest"))
    virg.add_argument("--virt-type", dest="hv_type",
                    default="",
                    help=_("Hypervisor name to use (kvm, qemu, xen, ...)"))
    virg.add_argument("--accelerate", action="store_true", default=False,
                     help=argparse.SUPPRESS)
    virg.add_argument("--arch",
                    help=_("The CPU architecture to simulate"))
    virg.add_argument("--machine",
                    help=_("The machine type to emulate"))
    cli.add_old_feature_options(virg)

    misc = parser.add_argument_group(_("Miscellaneous Options"))
    misc.add_argument("--autostart", action="store_true", dest="autostart",
                    default=False,
                    help=_("Have domain autostart on host boot up."))
    misc.add_argument("--wait", type=int, dest="wait",
                    help=_("Minutes to wait for install to complete."))

    cli.add_misc_options(misc, prompt=True, printxml=True, printstep=True,
                         noreboot=True, dryrun=True, noautoconsole=True)

    return parser.parse_args()


###################
# main() handling #
###################

def main(conn=None):
    cli.earlyLogging()
    options = parse_args()

    # Default setup options
    options.quiet = options.xmlstep or options.xmlonly or options.quiet

    cli.setupLogging("virt-install", options.debug, options.quiet)

    check_cdrom_option_error(options)

    if options.distro_variant == "list":
        logging.debug("OS list requested")
        for t in virtinst.osdict.list_os(list_types=True):
            for v in virtinst.osdict.list_os(typename=t.name):
                print "%-20s : %s" % (v.name, v.label)
        return 0

    cli.set_force(options.force)
    cli.set_prompt(options.prompt)

    parsermap = cli.build_parser_map(options)
    if cli.check_option_introspection(options, parsermap):
        return 0

    if conn is None:
        conn = cli.getConnection(options.connect)

    if options.xmlstep not in [None, "1", "2", "3", "all"]:
        fail(_("--print-step must be 1, 2, 3, or all"))

    guest = build_guest_instance(conn, options, parsermap)
    continue_inst = guest.get_continue_inst()

    if options.xmlstep or options.xmlonly or options.dry:
        xml = xml_to_print(guest, continue_inst,
                           options.xmlonly, options.xmlstep, options.dry)
        if xml:
            print_stdout(xml, do_force=True)
    else:
        start_install(guest, continue_inst, options)

    return 0

if __name__ == "__main__":
    try:
        sys.exit(main())
    except SystemExit, sys_e:
        sys.exit(sys_e.code)
    except KeyboardInterrupt:
        logging.debug("", exc_info=True)
        print_stderr(_("Installation aborted at user request"))
    except Exception, main_e:
        fail(main_e)