[X2Go-Dev] Bug#989: pyhoca-gui fails to fall back to Gtk-2.0 notifications (pynotify)

[Ondřej Grover]

Package: pyhoca-gui
Version: 0.5.0.5-0x2go1+git20160128.1329+jessie.main.1

Dear maintainers,

I believe commit e44e848415eff3e4dab69e990adfc447e79143f8 which introduced
GTK3 notification support broke GTK2 notification support fallback. The
problem was not present in 0.5.0.4

I believe the problem lies in this import construct in
pyhoca/wxgui/notify.py which will fail the same way even when put alone in
a file

try:
    from gi.repository import Notify as _Notify
except ImportError:
    import pynotify as _Notify

I think the problem is that even if the GTK3 Notify module is not
available, many GTK3 libraries get loaded and then the pynotify import
fails with

ImportError: could not import gobject (could not find _PyGObject_API object)

This is the same exception I see when running pyhoca-gui.

I think some more sophisticated GTK version selection mechanism is needed,
one that would not start loading conflicting libraries.

As a workaround for now I just removed that GTK3 import on my system.

My system is Debian 8.3 Jessie with the following (possibly relevant) gtk
packages installed

dpkg -l | grep '^.i.*gtk[23].*'

ii  libavahi-ui-gtk3-0:amd64               0.6.31-5
               amd64        Avahi GTK+ User interface library for GTK3
ii  libcanberra-gtk3-0:amd64               0.30-2.1
               amd64        GTK+ 3.0 helper for playing widget event sounds
with libcanberra
ii  libcanberra-gtk3-module:amd64          0.30-2.1
               amd64        translates GTK3 widgets signals to event sounds
ii  libdbusmenu-gtk3-4:amd64               12.10.2-1
                amd64        library for passing menus over DBus - GTK+
version
ii  libgirara-gtk3-1:amd64                 0.2.3-1
                amd64        library for minimalistic user interfaces
(shared libraries, GTK+ 3)
ii  libgtk2-ex-podviewer-perl              0.18-1
               all          Perl Gtk2 widget for displaying Plain Old
Documentation (POD)
ii  libgtk2-ex-simple-list-perl            0.50-2
               all          simple interface to Gtk2's complex MVC list
widget
ii  libgtk2-imageview-perl                 0.05-2+b1
                amd64        Perl bindings for the GtkImageView image
viewer widget
ii  libgtk2-perl                           2:1.2492-4
               amd64        Perl interface to the 2.x series of the Gimp
Toolkit library
ii  libgtk2.0-0:amd64                      2.24.25-3
                amd64        GTK+ graphical user interface library
ii  libgtk2.0-bin                          2.24.25-3
                amd64        programs for the GTK+ graphical user interface
library
ii  libgtk2.0-common                       2.24.25-3
                all          common files for the GTK+ graphical user
interface library
ii  libwxgtk3.0-0:amd64                    3.0.2-1+b1
               amd64        wxWidgets Cross-platform C++ GUI toolkit (GTK+
runtime
ii  pinentry-gtk2                          0.8.3-2
                amd64        GTK+-2-based PIN or pass-phrase entry dialog
for GnuPG
ii  python-gtk2                            2.24.0-4
               amd64        Python bindings for the GTK+ widget set
ii  python-wxgtk3.0                        3.0.1.1+dfsg-2
               amd64        Python interface to the wxWidgets
Cross-platform C++ GUI toolkit

Kind regards,
Ondřej Grover
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