Bug 1303359 - [Zenity] DBUS_SESSION_BUS_ADDRESS not set for ssh, systemd service or cronjob
[Zenity] DBUS_SESSION_BUS_ADDRESS not set for ssh, systemd service or cronjob
Product: Fedora
Classification: Fedora
Component: openssh (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
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Assigned To: Jakub Jelen
Fedora Extras Quality Assurance
Depends On:
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Reported: 2016-01-31 06:05 EST by srakitnican
Modified: 2016-12-20 14:02 EST (History)
7 users (show)

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Doc Type: Bug Fix
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Last Closed: 2016-12-20 13:20:08 EST
Type: Bug
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Description srakitnican 2016-01-31 06:05:38 EST
Description of problem: By logging in from remote computer over ssh and setting DISPLAY variable to :0 in order to use local X applications, zenity is unable to work entirely. For example "zenity --question" works and displays a dialog, while "zenity --notification --text 'Text'" throws an error and nothing happens.

$ zenity --question                                       
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.

$ zenity --notification --text "Test"

** (zenity:4035): WARNING **: Error showing notification: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Notifications was not provided by any .service files

Version-Release number of selected component (if applicable):

How reproducible: Always

Steps to Reproduce:
1. Login To computer A from remote computer B using ssh
2. Set DISPLAY variable to :0
3. Try to use zenity

Actual results:

Expected results:

Additional info:
Comment 1 srakitnican 2016-02-05 07:42:09 EST
The cause for this issue is that environment variable DBUS_SESSION_BUS_ADDRESS is not set for user ssh session, cronjob or systemd service file. None of these works with zenity --notification or notify-send.

By user I mean I have used this services as the same user that owns the Desktop.
Comment 2 srakitnican 2016-02-05 07:43:49 EST
Background: http://forums.fedoraforum.org/showthread.php?t=308669
Comment 3 Matthias Clasen 2016-02-12 11:34:57 EST
There is nothing zenity can do about this. This is just the way ssh sessions work - they don't forward the session bus. Changing that would require changes in openssh.
Comment 4 srakitnican 2016-02-12 13:11:55 EST
I personally could live without ssh session support, but the most useful thing for zenity is background scripts and user notification. Right now it doesn't work from user cron jobs or user system service if DBUS_SESSION_BUS_ADDRESS is not provided for which I found methods to set it only in some hackish ways [1]?

I have noticed systemd --user already sets variables for DISPLAY and XAUTHORITY [2], could it also set variable for DBUS_SESSION_BUS_ADDRESS?

Or why zenity dialogs works fine with just DISPLAY variable set while --notification requires also DBUS_SESSION_BUS_ADDRESS. Could it be done in some other way to make it more simple and not require additional environment variable which is not available by default?

[1] http://ubuntuforums.org/showthread.php?t=1727148&p=10675502#post10675502
[2] https://github.com/systemd/systemd/blob/v219/NEWS#L194
Comment 5 Jakub Jelen 2016-05-06 04:00:05 EDT
I don't think this is anything we would be implementing in openssh. As far as I understand it it would require D-bus tunneling (over secure channel) between remote (where zenity is running) and your desktop (where notification is shown). It is something different than only X11 forwarding.

It might be possible, if you forward the port using SSH RemotePortForwarding, but I was unable to make it work. There is nice information guide about RemoteDBus [1]. You might be more lucky if you try to check with systemd guys.

[1] https://www.freedesktop.org/wiki/Software/DBusRemote/
Comment 6 Fedora Update System 2016-07-27 06:40:36 EDT
openssh-7.2p2-11.fc24 selinux-policy-3.13.1-191.8.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-99191c4aab
Comment 7 Lukas Vrabec 2016-07-27 06:52:11 EDT
Reverting to NEW state. BZ was switched to MODIFIED due to wrong bodhi update.
Comment 8 Fedora End Of Life 2016-11-24 10:18:32 EST
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Approximately 4 (four) weeks from now Fedora will stop maintaining
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Comment 9 Fedora End Of Life 2016-12-20 13:20:08 EST
Fedora 23 changed to end-of-life (EOL) status on 2016-12-20. Fedora 23 is
no longer maintained, which means that it will not receive any further
security or bug fix updates. As a result we are closing this bug.

If you can reproduce this bug against a currently maintained version of
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Thank you for reporting this bug and we are sorry it could not be fixed.
Comment 10 srakitnican 2016-12-20 14:02:47 EST
Not sure if it was fixed by someone intentionally, it seems it is working without having to set DBUS_SESSION_BUS_ADDRESS.

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