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Filename : do-partial-upgrade
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#!/usr/bin/python3
# -*- Mode: Python; indent-tabs-mode: nil; tab-width: 4; coding: utf-8 -*-
#  
#  Copyright (c) 2004-2012 Canonical
#                2004-2008 Michael Vogt
#                2004 Michiel Sikkes
#  
#  Author: Michiel Sikkes <michiel@eyesopened.nl>
#          Michael Vogt <mvo@debian.org>
# 
#  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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
#  USA

from __future__ import print_function

import os
import subprocess
import sys

from DistUpgrade.DistUpgradeVersion import VERSION
from DistUpgrade.DistUpgradeController import DistUpgradeController
from DistUpgrade.DistUpgradeConfigParser import DistUpgradeConfig
from DistUpgrade.DistUpgradeMain import (
    setup_logging,
    setup_view,
)
import locale
import gettext

from optparse import OptionParser

if __name__ == "__main__":

    #FIXME: Workaround a bug in optparser which doesn't handle unicode/str
    #       correctly, see http://bugs.python.org/issue4391
    #       Should be resolved by Python3
    gettext.bindtextdomain("ubuntu-release-upgrader", "/usr/share/locale")
    gettext.textdomain("ubuntu-release-upgrader")
    translation = gettext.translation("ubuntu-release-upgrader", fallback=True)
    if sys.version >= '3':
        _ = translation.gettext
    else:
        _ = translation.ugettext

    try:
        locale.setlocale(locale.LC_ALL, "")
    except:
        pass

    # gtk2 used to throw a exception when it failed to init the display,
    # so back then it was safe to try to import the frontend and fallback
    # to text if the import failed. this is no longer the case so we need
    # do figure it out here :/
    if "DISPLAY" in os.environ:
        default_frontend = "DistUpgradeViewGtk3"
    else:
        default_frontend = "DistUpgradeViewText"

    # Begin parsing of options
    parser = OptionParser()
    parser.add_option ("-V", "--version", action="store_true",
                       dest="show_version", default=False,
                       help=_("Show version and exit"))
    parser.add_option ("--data-dir", "", dest="datadir",
                       default="/usr/share/ubuntu-release-upgrader/",
                       help=_("Directory that contains the data files"))
    parser.add_option ("-f", "--frontend", default=default_frontend,
                       dest="frontend", 
                       help=_("Run the specified frontend"))

    (options, args) = parser.parse_args()

    datadir = os.path.normpath(options.datadir)+"/"

    if options.show_version:
        print("%s: version %s" % (os.path.basename(sys.argv[0]), VERSION))
        sys.exit(0)

    # raise privileges when not started as root
    if os.getuid() != 0:
        # apply workaround for Wayland
        if ((options.frontend in {"DistUpgradeViewGtk3"} and
             'WAYLAND_DISPLAY' in os.environ)):
            subprocess.run(['xhost', '+si:localuser:root'])
        os.execv("/usr/bin/pkexec", ["pkexec"] + sys.argv)

    # we are by definition in partial upgrade mode
    options.partial = True
    config = DistUpgradeConfig(options.datadir)
    logdir = setup_logging(options, config)
    view = setup_view(options, config, logdir)

    if options.frontend == "DistUpgradeViewGtk3":
        from gi.repository import Gtk
        import gi
        gi.require_version("Gtk", "3.0")
        Gtk.init_check(sys.argv)
        Gtk.Window.set_default_icon_name("system-software-update")
        view.label_title.set_markup("<b><big>%s</big></b>" %
                                    _("Running partial upgrade"))
    controller = DistUpgradeController(view, datadir=datadir)
    controller.doPartialUpgrade()