https://bugs.kde.org/show_bug.cgi?id=460238
Bug ID: 460238
Summary: In a xorg session xdg-desktop-portal is started
without $XDG_CURRENT_DESKTOP in environment
Classification: Plasma
Product: xdg-desktop-portal-kde
Version: 5.25.5
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: ales.ast...@gmail.com
CC: aleix...@kde.org, jgrul...@redhat.com, n...@kde.org
Target Milestone: ---
SUMMARY
Preface: reporting under xdg-desktop-portal-kde despite this being of wider
scope, and probably not related to the kde portal at all...
When multiple portals are installed, xdg-desktop-portal picks the best one for
the current session based on $XDG_CURRENT_DESKTOP. But in a Plasma X11 session
xdg-desktop-portal.service is started without such variable in its environment.
So the portal falls back to choosing the implementation with alphabetical
order, and gnome wins.
This only happens in Plasma X11, the variable (alongside the other XDG and
/etc/profile.d/ variables) is picked up in a Plasma Wayland session. This
happens both with and without systemdBoot.
xdg-desktop-portal-gtk is the only service that gets started with all my
environment variables, where xdg-desktop-portal, xdg-desktop-portal-gnome,
plasma-xdg-desktop-portal-kde are not
STEPS TO REPRODUCE
1. Install both xdg-desktop-portal-kde and xdg-desktop-portal-gnome
2. Fresh reboot (log-out and log-in causes a different behaviour...)
2. Log into a Plasma X11 session
OBSERVED RESULT
`xargs -0 -L1 -a /proc/$(pidof xdg-desktop-portal)/environ` does not contain
XDG_CURRENT_DESKTOP.
A visible effect, for example, is that in flatpaks the file picker is GTK
Another important effect is that when an application is started as a result of
opening a file from inside a flatpak, it will inherit an incomplete environment
from xdg-desktop-portal. For example, opening a PDF from Telegram flatpak will
make Okular not use the Breeze theme, and other applications may have other
issues depending on what XDG environment variables they expect.
EXPECTED RESULT
More user environment variables are imported when starting xdg-desktop-portal,
so that the correct portal implementation is picked, and a complete environment
is used when forking.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora 36 KDE
(available in About System)
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
ADDITIONAL INFORMATION
As far as I understand xdg-desktop-portal is dbus-activated and its environment
variables depend on the process that activates it. In my case that process
seems to be early-started, before (who?) sets XDG_CURRENT_DESKTOP and friends.
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