core-admin/qvm-tools/qvm-backup-restore

#!/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.
#
#
from multiprocessing import Event

from qubes.qubes import QubesVmCollection
from qubes.qubes import QubesException
from qubes.backup import backup_restore_header
from qubes.backup import backup_restore_prepare
from qubes.backup import backup_restore_print_summary
from qubes.backup import backup_restore_do
import qubes.backup
import sys
from optparse import OptionParser
from locale import getpreferredencoding

import os
import sys
import getpass

def main():
    usage = "usage: %prog [options] <backup-dir> [vms-to-be-restored ...]"
    parser = OptionParser (usage)

    parser.add_option ("--verify-only", action="store_true",
                       dest="verify_only", default=False,
                       help="Verify backup integrity without restoring any "
                            "data")

    parser.add_option ("--skip-broken", action="store_true", dest="skip_broken", default=False,
                       help="Do not restore VMs that have missing TemplateVMs "
                            "or NetVMs")

    parser.add_option ("--ignore-missing", action="store_true", dest="ignore_missing", default=False,
                       help="Restore VMs even if their associated TemplateVMs "
                            "and NetVMs are missing")

    parser.add_option ("--skip-conflicting", action="store_true", dest="skip_conflicting", default=False,
                       help="Do not restore VMs that are already present on "
                            "the host")

    parser.add_option ("--rename-conflicting", action="store_true",
                       dest="rename_conflicting", default=False,
                       help="Restore VMs that are already present on the host "
                            "under different names")

    parser.add_option ("--force-root", action="store_true", dest="force_root", default=False,
                       help="Force to run with root privileges")

    parser.add_option ("--replace-template", action="append", dest="replace_template", default=[],
                       help="Restore VMs using another TemplateVM; syntax: "
                            "old-template-name:new-template-name (may be "
                            "repeated)")

    parser.add_option ("-x", "--exclude", action="append", dest="exclude", default=[],
                       help="Skip restore of specified VM (may be repeated)")

    parser.add_option ("--skip-dom0-home", action="store_false", dest="dom0_home", default=True,
                       help="Do not restore dom0 user home directory")

    parser.add_option ("--ignore-username-mismatch", action="store_true", dest="ignore_username_mismatch", default=False,
                       help="Ignore dom0 username mismatch when restoring home "
                            "directory")

    parser.add_option ("-d", "--dest-vm", action="store", dest="appvm",
                       help="Specify VM containing the backup to be restored")

    parser.add_option ("-e", "--encrypted", action="store_true", dest="decrypt", default=False,
                       help="The backup is encrypted")

    parser.add_option ("-p", "--passphrase-file", action="store",
                       dest="pass_file", default=None,
                       help="Read passphrase from file, or use '-' to read from stdin")

    parser.add_option ("-z", "--compressed", action="store_true", dest="compressed", default=False,
                       help="The backup is compressed")

    parser.add_option ("--debug", action="store_true", dest="debug",
                       default=False, help="Enable (a lot of) debug output")

    (options, args) = parser.parse_args ()

    if (len (args) < 1):
        print >> sys.stderr, "You must specify the backup directory "\
                             "(e.g. /mnt/backup/qubes-2010-12-01-235959)"
        exit (0)

    backup_dir = args[0]
    vmlist = args[1:]

    #if not os.path.exists (backup_dir):
    #    print >> sys.stderr, "The backup directory doesn't exist!"
    #    exit(1)

    host_collection = QubesVmCollection()
    host_collection.lock_db_for_writing()
    host_collection.load()

    restore_options = {}
    if options.ignore_missing:
        restore_options['use-default-template'] = True
        restore_options['use-default-netvm'] = True
    if options.replace_template:
        restore_options['replace-template'] = options.replace_template
    if options.rename_conflicting:
        restore_options['rename-conflicting'] = True
    if not options.dom0_home:
        restore_options['dom0-home'] = False
    if options.ignore_username_mismatch:
        restore_options['ignore-username-mismatch'] = True
    if options.exclude:
        restore_options['exclude'] = options.exclude
    if options.verify_only:
        restore_options['verify-only'] = True
    if options.debug:
        qubes.backup.BACKUP_DEBUG = True

    appvm = None
    if options.appvm is not None:
        appvm = host_collection.get_vm_by_name(options.appvm)
        if appvm is None:
            print >>sys.stderr, "ERROR: VM {0} does not exist".format(options.appvm)
            exit(1)

    if options.pass_file is not None:
        f = open(options.pass_file) if options.pass_file != "-" else sys.stdin
        passphrase = f.readline().rstrip()
        if f is not sys.stdin:
            f.close()
    else:
        passphrase = getpass.getpass("Please enter the passphrase to verify "
                                     "and (if encrypted) decrypt the backup: ")

    encoding = sys.stdin.encoding or getpreferredencoding()
    passphrase = passphrase.decode(encoding)

    print >> sys.stderr, "Checking backup content..."

    error_detected = Event()
    def error_callback(message):
        error_detected.set()
        print >> sys.stderr, message

    restore_info = None
    try:
        restore_info = backup_restore_prepare(
                backup_dir,
                passphrase=passphrase,
                options=restore_options,
                host_collection=host_collection,
                encrypted=options.decrypt,
                compressed=options.compressed,
                appvm=appvm,
                error_callback=error_callback)
    except QubesException as e:
        print >> sys.stderr, "ERROR: %s" % str(e)
        exit(1)

    if len(vmlist) > 0:
        for vm in restore_info.keys():
            if vm.startswith('$'):
                continue
            if not vm in vmlist:
                restore_info.pop(vm)

    backup_restore_print_summary(restore_info)

    there_are_conflicting_vms = False
    there_are_missing_templates = False
    there_are_missing_netvms = False
    dom0_username_mismatch = False

    for vm_info in restore_info.values():
        if 'excluded' in vm_info and vm_info['excluded']:
            continue
        if 'missing-template' in vm_info.keys():
            there_are_missing_templates = True
        if 'missing-netvm' in vm_info.keys():
            there_are_missing_netvms = True
        if 'already-exists' in vm_info.keys():
            there_are_conflicting_vms = True
        if 'username-mismatch' in vm_info.keys():
            dom0_username_mismatch = True

    print

    if hasattr(os, "geteuid") and os.geteuid() == 0:
        print >> sys.stderr, "*** Running this tool as root is strongly "\
                             "discouraged. This will lead to permissions "\
                             "problems."
        if options.force_root:
            print >> sys.stderr, "Continuing as commanded. You have been "\
                                 "warned."
        else:
            print >> sys.stderr, "Retry as an unprivileged user, or use "\
                                 "--force-root to continue anyway."
            exit(1)

    if there_are_conflicting_vms:
        print >> sys.stderr, "*** There are VMs with conflicting names on the "\
                             "host! ***"
        if options.skip_conflicting:
            print >> sys.stderr, "Those VMs will not be restored. The host "\
                                 "VMs will NOT be overwritten."
        else:
            print >> sys.stderr, "Remove VMs with conflicting names from the "\
                                 "host before proceeding."
            print >> sys.stderr, "Or use --skip-conflicting to restore only "\
                                 "those VMs that do not exist on the host."
            print >> sys.stderr, "Or use --rename-conflicting to restore " \
                                 "those VMs under modified names (with "\
                                 "numbers at the end)."
            exit (1)

    print "The above VMs will be copied and added to your system."
    print "Exisiting VMs will NOT be removed."

    if there_are_missing_templates:
        print >> sys.stderr, "*** One or more TemplateVMs are missing on the"\
                             "host! ***"
        if not (options.skip_broken or options.ignore_missing):
            print >> sys.stderr, "Install them before proceeding with the "\
                                 "restore."
            print >> sys.stderr, "Or pass: --skip-broken or --ignore-missing."
            exit (1)
        elif options.skip_broken:
            print >> sys.stderr, "Skipping broken entries: VMs that depend on "\
                                 "missing TemplateVMs will NOT be restored."
        elif options.ignore_missing:
            print >> sys.stderr, "Ignoring missing entries: VMs that depend "\
                                 "on missing TemplateVMs will NOT be restored."
        else:
            print >> sys.stderr, "INTERNAL ERROR! Please report this to the "\
                                 "Qubes OS team!"
            exit (1)

    if there_are_missing_netvms:
        print >> sys.stderr, "*** One or more NetVMs are missing on the "\
                             "host! ***"
        if not (options.skip_broken or options.ignore_missing):
            print >> sys.stderr, "Install them before proceeding with the "\
                                 "restore."
            print >> sys.stderr, "Or pass: --skip-broken or --ignore-missing."
            exit (1)
        elif options.skip_broken:
            print >> sys.stderr, "Skipping broken entries: VMs that depend on "\
                                 "missing NetVMs will NOT be restored."
        elif options.ignore_missing:
            print >> sys.stderr, "Ignoring missing entries: VMs that depend "\
                                 "on missing NetVMs will NOT be restored."
        else:
            print >> sys.stderr, "INTERNAL ERROR! Please report this to the "\
                                 "Qubes OS team!"
            exit (1)

    if 'dom0' in restore_info.keys() and options.dom0_home:
        if dom0_username_mismatch:
            print >> sys.stderr, "*** Dom0 username mismatch! This can break "\
                                 "some settings! ***"
            if not options.ignore_username_mismatch:
                print >> sys.stderr, "Skip restoring the dom0 home directory "\
                                     "(--skip-dom0-home), or pass "\
                                     "--ignore-username-mismatch to continue "\
                                     "anyway."
                exit(1)
            else:
                print >> sys.stderr, "Continuing as directed."
        print >> sys.stderr, "NOTE: Before restoring the dom0 home directory, "
                             "a new directory named "\
                             "'home-pre-restore-<current-time>' will be "\
                             "created inside the dom0 home directory. If any "\
                             "restored files conflict with existing files, "\
                             "the existing files will be moved to this new "\
                             "directory."

    if options.pass_file is None:
        if raw_input("Do you want to proceed? [y/N] ").upper() != "Y":
            exit(0)

    try:
        backup_restore_do(restore_info,
                host_collection=host_collection,
                error_callback=error_callback)
    except QubesException as e:
        print >> sys.stderr, "ERROR: %s" % str(e)

    host_collection.unlock_db()

    if error_detected.is_set():
        print "-> Completed with errors!"
        exit(1)
    else:
        print "-> Done."
main()