golden hour

/usr/lib/python3/dist-packages/DistUpgrade

File/Folder	Size	Actions
DistUpgradeApport.py	4.95 KB
DistUpgradeAptCdrom.py	12.39 KB
DistUpgradeCache.py	52.93 KB
DistUpgradeConfigParser.py	3.75 KB
DistUpgradeController.py	101.89 KB
DistUpgradeFetcher.py	5.87 KB
DistUpgradeFetcherCore.py	11.2 KB
DistUpgradeFetcherKDE.py	9.72 KB
DistUpgradeFetcherSelf.py	2.02 KB
DistUpgradeGettext.py	2.97 KB
DistUpgradeMain.py	9.1 KB
DistUpgradePatcher.py	3.92 KB
DistUpgradeQuirks.py	49.04 KB
DistUpgradeVersion.py	21 B
DistUpgradeView.py	16.43 KB
DistUpgradeViewGtk3.py	33.85 KB
DistUpgradeViewKDE.py	42.11 KB
DistUpgradeViewNonInteractive.py	13.54 KB
DistUpgradeViewText.py	12.53 KB
GtkProgress.py	3.93 KB
MetaRelease.py	17.06 KB
QUrlOpener.py	3.24 KB
ReleaseNotesViewer.py	7.48 KB
ReleaseNotesViewerWebkit.py	2.91 KB
SimpleGtk3builderApp.py	2.01 KB
SimpleGtkbuilderApp.py	1.99 KB
__init__.py	0 B
__pycache__	-
apt_btrfs_snapshot.py	9.64 KB
apt_clone.py	32.81 KB
dist-upgrade.py	129 B
distro.py	23.15 KB
telemetry.py	3.4 KB
utils.py	17.92 KB
xorg_fix_proprietary.py	3.99 KB

Edit: DistUpgradeFetcherSelf.py

# DistUpgradeFetcherSelf.py
#  
#  Copyright (c) 2007-2012 Canonical
#  
#  Author: Michael Vogt <michael.vogt@ubuntu.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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
#  USA

import logging
import shutil

from .DistUpgradeFetcherCore import DistUpgradeFetcherCore

class DistUpgradeFetcherSelf(DistUpgradeFetcherCore):
    def __init__(self, new_dist, progress, options, view):
        DistUpgradeFetcherCore.__init__(self, new_dist, progress)
        self.view = view
        # user chose to use the network, otherwise it would not be
        # possible to download self
        self.run_options += ["--with-network"]
        # make sure to run self with proper options
        if options.cdromPath is not None:
            self.run_options += ["--cdrom=%s" % options.cdromPath]
        if options.frontend is not None:
            self.run_options += ["--frontend=%s" % options.frontend]

def error(self, summary, message):
        return self.view.error(summary, message)

def runDistUpgrader(self):
        " overwrite to ensure that the log is copied "
        # copy log so it isn't overwritten
        logging.info("runDistUpgrader() called, re-exec self")
        logging.shutdown()
        shutil.copy("/var/log/dist-upgrade/main.log",
                    "/var/log/dist-upgrade/main_update_self.log")
        # re-exec self
        DistUpgradeFetcherCore.runDistUpgrader(self)