#!/usr/bin/python2.6
#
# 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.
#
#

from qubes.qubes import QubesVmCollection
from qubes.qubes import QubesAppVm, QubesTemplateVm, QubesHVm
from qubes.qubes import QubesException
from optparse import OptionParser;
import sys
import os

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")

    (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 os.geteuid() == 0:
        if not options.force_root:
            print >> sys.stderr, "*** Running this tool as root is strongly discouraged, this will lead you in permissions problems."
            print >> sys.stderr, "Retry as unprivileged user."
            print >> sys.stderr, "... 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 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)

    dst_vm = None
    if isinstance(src_vm, QubesTemplateVm):
        dst_vm = qvm_collection.add_new_templatevm(name=dstname,
                                              dir_path=options.dir_path, installed_by_rpm=False)
    elif isinstance(src_vm, QubesAppVm):
        dst_vm = qvm_collection.add_new_appvm(name=dstname, template=src_vm.template,
                                              label=src_vm.label,
                                              dir_path=options.dir_path)
    elif isinstance(src_vm, QubesHVm):
        dst_vm = qvm_collection.add_new_hvm(name=dstname, label=src_vm.label)
    else:
        print >> sys.stderr, "ERROR: Clone not supported for this type of VM"
        exit(1)

    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)
        exit (1)

    qvm_collection.save()
    qvm_collection.unlock_db()
    
main()