On Thu, Jan 13, 2022 at 05:06:29PM +1100, Trent W. Buck wrote:
Francesco,
Is dbus-user-session installed?
xfce4-session recommends dbus-user-session, so
it SHOULD already be installed.
As explained this is a bug found casually while using testing64, at the stage
of its development in that date, by installing xfce4 (the meta-package) after
a base system installation (i.e. without any desktop task installed).
I have no idea if currently this isssue is still present, but I think
it could be reproduced as detailed, something I could eventually try again
in a nearest future.
-cheers
Francesco P. Lovergine wrote:
Package: xfce4
Version: 4.16
Severity: normal
I found a missing dependency on /usr/bin/dbus-launch (dbus-x11) in bullseye,
somewhere. Not sure this is an xfce4 issue specifically, feel free to
reassign to another proper package.
In order to replicate the problem: I just installed from scratch a bullseye
current image (debian/testing64) in vagrant, with virtualbox provider, an
upgraded it. Then installed xfce4i (the metapackage) and started lightdm.
After that, the user cannot login and start a session due to missing
dbus-launch, with appropriate message at screen. Installing dbus-x11 solves
the problem.
dbus-launch (from "dbus-x11") package is the Old Way,
which is still attempted as a fallback.
Most systemd linux systems will instead use libpam-systemd to set up the user
dbus session.
In this case, dbus-launch is not used.
You can see this in the source code -- if there's already a dbus
session (usually created by systemd), it just returns immediately.
https://sources.debian.org/src/xfce4-session/4.16.0-1/xfce4-session/main.c/#L275-L278
This is encoded in the control file like this:
https://sources.debian.org/src/xfce4-session/4.16.0-1/debian/control/#L31
On a Debian GNU/Linux architecture, that
will default to the systemd path (dbus-user-session).
Where systemd isn't available (e.g. Debian GNU/kFreeBSD),
it falls back to dbus-x11 (dbus-launch).
See also
https://sources.debian.org/src/xfce4-session/4.16.0-1/debian/changelog/#L37-L38
https://bugs.debian.org/836062
--
Francesco P. Lovergine
