#!/usr/bin/python2
# -*- encoding: utf8 -*-
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2010  Joanna Rutkowska <joanna@invisiblethingslab.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 os
import sys
from optparse import OptionParser

from qubes.qubes import QubesVmCollection


def main():
    usage = "usage: %prog [options] <src-name> <new-name>\n"\
            "Clones an existing VM by copying all its disk files"

    parser = OptionParser(usage)
    parser.add_option("-q", "--quiet", action="store_false", dest="verbose",
                      default=True)
    parser.add_option("-p", "--path", dest="dir_path",
                      help="Specify path to the template directory")
    parser.add_option("--force-root", action="store_true", dest="force_root",
                      default=False,
                      help="Force to run, even with root privileges")
    parser.add_option("-P", "--pool", dest="pool_name",
                      help="Specify in to which storage pool to clone")

    (options, args) = parser.parse_args()
    if (len(args) != 2):
        parser.error(
            "You must specify at least the src and dst TemplateVM names!")
    srcname = args[0]
    dstname = args[1]

    if hasattr(os, "geteuid") and os.geteuid() == 0:
        if not options.force_root:
            print >> sys.stderr, "WARNING: Running this tool as root can lead to" + \
                " permission problems and is strongly discouraged. Please" + \
                " retry as an unprivileged user or use --force-root to" + \
                " continue anyway."
            exit(1)

    qvm_collection = QubesVmCollection()
    qvm_collection.lock_db_for_writing()
    qvm_collection.load()

    src_vm = qvm_collection.get_vm_by_name(srcname)
    if src_vm is None:
        print >> sys.stderr, \
            "ERROR: A VM with the name '{0}' does not exist in the system." \
            .format(srcname)
        exit(1)

    if options.pool_name is None:
        pool_name = src_vm.pool_name
    else:
        pool_name = options.pool_name

    if qvm_collection.get_vm_by_name(dstname) is not None:
        print >> sys.stderr, \
            "ERROR: A VM with the name '{0}' already exists in the system." \
            .format(dstname)
        exit(1)

    if src_vm.is_disposablevm():
        print >> sys.stderr, "ERROR: Clone not supported for this type of VM"
        exit(1)

    dst_vm = qvm_collection.add_new_vm(src_vm.__class__.__name__,
                                       name=dstname, template=src_vm.template,
                                       pool_name=pool_name,
                                       dir_path=options.dir_path,
                                       installed_by_rpm=False)

    try:
        dst_vm.clone_attrs(src_vm)
        dst_vm.clone_disk_files(src_vm=src_vm, verbose=options.verbose)
    except (IOError, OSError) as err:
        print >> sys.stderr, "ERROR: {0}".format(err)
        qvm_collection.pop(dst_vm.qid)
        dst_vm.remove_from_disk()
        exit(1)

    qvm_collection.save()
    qvm_collection.unlock_db()

main()