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#! /usr/bin/python -tt
#
# Copyright(c) FUJITSU Limited 2007.
#
# Script to set up an cloning guest configuration and kick off an cloning
#
# 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 sys
import logging
import virtinst.CloneManager as clmgr
import urlgrabber.progress as progress

import optparse
from optparse import OptionGroup
import virtinst.cli as cli
from virtinst.cli import fail, print_stdout, print_stderr
from virtinst.User import User

cli.setupGettext()

### General input gathering functions
def get_clone_name(new_name, auto_clone, design):
    if not new_name and auto_clone:
        # Generate a name to use
        new_name = clmgr.generate_clone_name(design)
        logging.debug("Auto-generated clone name '%s'", new_name)

    prompt_txt = _("What is the name for the cloned virtual machine?")
    err_txt = _("A name is required for the new virtual machine.")
    cli.prompt_loop(prompt_txt, err_txt, new_name, design, "clone_name")

def get_original_guest(guest_name, origfile, design):

    origxml = None
    if origfile:
        f = open(origfile, "r")
        origxml = f.read()
        f.close()

        try:
            design.original_xml = origxml
            return
        except (ValueError, RuntimeError), e:
            fail(e)

    prompt_txt = _("What is the name of the original virtual machine?")
    err_txt = _("An original machine name or xml file is required.")
    cli.prompt_loop(prompt_txt, err_txt,
                    guest_name, design, "original_guest")

def get_clone_macaddr(new_mac, design):
    if new_mac is None:
        pass
    elif new_mac[0] == "RANDOM":
        new_mac = None
    else:
        for i in new_mac:
            design.clone_mac = i

def get_clone_uuid(new_uuid, design):
    if new_uuid is not None:
        design.clone_uuid = new_uuid

def get_clone_diskfile(new_diskfiles, design, conn, preserve=False,
                       auto_clone=False):
    if new_diskfiles is None:
        new_diskfiles = [None]

    conn = design.original_conn

    newidx = 0
    for origdev in design.original_devices:
        if len(new_diskfiles) <= newidx:
            # Extend the new/passed paths list with None if it's not
            # long enough
            new_diskfiles.append(None)
        disk = new_diskfiles[newidx]

        if disk is None and auto_clone:
            disk = clmgr.generate_clone_disk_path(origdev, design)

        if origdev is None:
            devpath = None
        else:
            dev = _check_disk(conn, disk, origdev, preserve)
            devpath = dev.path

        design.clone_devices = devpath
        newidx += 1

def _check_disk(conn, clone_path, orig_path, preserve):

    prompt_txt = (_("What would you like to use as the cloned disk "
                    "(file path) for '%s'?") % orig_path)

    return cli.disk_prompt(conn, clone_path, .00001, False,
                           prompt_txt,
                           warn_overwrite=not preserve,
                           check_size=False,
                           path_to_clone=orig_path)

def get_clone_sparse(sparse, design):
    design.clone_sparse = sparse

def get_preserve(preserve, design):
    design.preserve = preserve


def get_force_target(target, design):
    for i in target or []:
        design.force_target = i

def parse_args():
    parser = cli.setupParser()
    cli.add_connect_option(parser)

    geng = OptionGroup(parser, _("General Options"))
    geng.add_option("-o", "--original", dest="original_guest",
                    help=_("Name of the original guest; "
                           "The status must be shut off or paused."))
    geng.add_option("", "--original-xml", dest="original_xml",
                    help=_("XML file to use as the original guest."))
    geng.add_option("", "--auto-clone", dest="auto_clone", action="store_true",
                    help=_("Auto generate clone name and storage paths from"
                           " the original guest configuration."))
    geng.add_option("-n", "--name", dest="new_name",
                    help=_("Name for the new guest"))
    geng.add_option("-u", "--uuid", dest="new_uuid",
                    help=_("New UUID for the clone guest; Default is a "
                           "randomly generated UUID"))
    parser.add_option_group(geng)

    stog = OptionGroup(parser, _("Storage Configuration"))
    stog.add_option("-f", "--file", dest="new_diskfile", action="append",
                    help=_("New file to use as the disk image for the "
                           "new guest"))
    stog.add_option("", "--force-copy", dest="target", action="append",
                    help=_("Force to copy devices (eg, if 'hdc' is a "
                           "readonly cdrom device, --force-copy=hdc)"))
    stog.add_option("", "--nonsparse", action="store_false", dest="sparse",
                    default=True,
                    help=_("Do not use a sparse file for the clone's "
                           "disk image"))
    stog.add_option("", "--preserve-data", action="store_false",
                    dest="preserve", default=True,
                    help=_("Do not clone storage, new disk images specified "
                           "via --file are preserved unchanged"))
    parser.add_option_group(stog)

    netg = OptionGroup(parser, _("Networking Configuration"))
    netg.add_option("-m", "--mac", dest="new_mac", action="append",
                    help=_("New fixed MAC address for the clone guest. "
                           "Default is a randomly generated MAC"))
    parser.add_option_group(netg)

    misc = OptionGroup(parser, _("Miscellaneous Options"))
    misc.add_option("", "--print-xml", action="store_true", dest="xmlonly",
                    help=_("Print the generated domain XML rather than define "
                           "and clone the guest."))
    misc.add_option("", "--replace", action="store_true", dest="replace",
                    help=_("Don't check for name collision. Allows replacing "
                           "an existing guest with the new clone"))
    misc.add_option("-d", "--debug", action="store_true", dest="debug",
                      help=_("Print debugging information"))
    misc.add_option("", "--prompt", action="store_true", dest="prompt",
                    default=False,
                    help=_("Request user input for ambiguous situations or "
                           "required options."))
    misc.add_option("", "--force", action="store_true", dest="force",
                    default=False,
                    help=_("Do not prompt for input. Answers yes where "
                           "applicable, terminates for all other prompts"))
    misc.add_option("-q", "--quiet", action="store_true", dest="quiet",
                    help=_("Suppress non-error output"))
    misc.add_option("", "--clone-running", action="store_true",
                    dest="clone_running", default=False,
                    help=optparse.SUPPRESS_HELP)
    parser.add_option_group(misc)

    (options, parseargs) = parser.parse_args()
    return options, parseargs

### Let's do it!
def main(conn=None):
    cli.earlyLogging()
    options, parseargs = parse_args()

    options.quiet = options.quiet or options.xmlonly
    cli.setupLogging("virt-clone", options.debug, options.quiet)
    if parseargs:
        fail(_("Unknown argument '%s'") % parseargs[0])

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

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

    if not User.current().has_priv(User.PRIV_CLONE, conn.getURI()):
        fail(_("Must be privileged to clone Xen guests"))

    design = clmgr.CloneDesign(conn=conn)

    design.clone_running = options.clone_running
    design.replace = bool(options.replace)
    get_original_guest(options.original_guest, options.original_xml,
                       design)
    get_clone_name(options.new_name, options.auto_clone, design)

    get_clone_macaddr(options.new_mac, design)
    get_clone_uuid(options.new_uuid, design)
    get_clone_sparse(options.sparse, design)
    get_force_target(options.target, design)
    get_preserve(options.preserve, design)

    # This determines the devices that need to be cloned, so that
    # get_clone_diskfile knows how many new disk paths it needs
    design.setup_original()

    get_clone_diskfile(options.new_diskfile, design, conn,
                       not options.preserve, options.auto_clone)

    # setup design object
    design.setup_clone()

    if options.xmlonly:
        print_stdout(design.clone_xml, do_force=True)
    else:
        # start cloning
        meter = progress.TextMeter(fo=sys.stdout)
        clmgr.start_duplicate(design, meter)

    print_stdout("")
    print_stdout(_("Clone '%s' created successfully.") % design.clone_name)
    logging.debug("end clone")
    return 0

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