X2Go Bug report logs - #1046
x2go session causes dbus conflicts with logged in desktop on Fedora 24

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Package: x2goserver; Maintainer for x2goserver is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goserver is src:x2goserver.

Reported by: Andy Wang <dopey@moonteeth.com>

Date: Sat, 25 Jun 2016 03:35:01 UTC

Severity: normal

Merged with 1083

Found in version 4.0.1.19

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Subject: Bug#1046: x2go session causes dbus conflicts with logged in desktop on Fedora 24
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From: Andy Wang <dopey@moonteeth.com>
Date: Fri, 24 Jun 2016 22:30:42 -0500
Message-ID: <CAGjaHhvetz3KfxWj+_96UFYZZEHU1XFgAuyX=tOYTXP=BvEVQg@mail.gmail.com>
To: submit@bugs.x2go.org
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[Message part 1 (text/plain, inline)]
Package: x2goserver
Version: 4.0.1.19-8.fc24

When attempting to login with a client desktop session that uses dbus while
logged in as the same user on the console causes an error to appear in a
pop up window:
Could not acquire name on session bus

You can dismiss the error but the desktop never full starts and attempts to
logout triggers the logout on the console session.

From the error, I this appears to be resolved by using a custom session
script in x2go and making sure to call: unset DBUS_SESSION_BUS_ADDRESS

For example:
#!/bin/sh
unset DBUS_SESSION_BUS_ADDRESS
# redirect to /dev/null due to x2go bug 914
/usr/bin/mate-session > /dev/null

Doing some digging, it looks like the dbus socket
(/usr/lib/systemd/user/dbus.socket) on fedora 24
(dbus-1.11.2-1.fc24.x86_64) does this:
ExecStartPost=-/usr/bin/systemctl --user set-environment
DBUS_SESSION_BUS_ADDRESS=unix:path=%t/bus

And sets the DBUS_SESSION_BUS_ADDRESS for all logins for your user.

This same workaround appears to be what tigervnc used as their permanent
solution:
https://github.com/TigerVNC/tigervnc/commit/c071e493a093d7ee9a568729dd2e151f5cd3d749

So I think this is the proper solution.

FYI, a bug was filed against Fedora as well:
https://bugzilla.redhat.com/show_bug.cgi?id=1350004

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