Bug 435468

Summary:	XDG_SESSION_ID no longer honored by KWin
Product:	[Plasma] kwin	Reporter:	Martin Flöser <mgraesslin>
Component:	core	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal	CC:	nate, vlad.zahorodnii
Priority:	NOR	Keywords:	regression
Version First Reported In:	git master
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:	https://invent.kde.org/plasma/kwin/commit/799db613817a458d9399f683f44b82d141746999	Version Fixed/Implemented In:
Sentry Crash Report:

Description Martin Flöser 2021-04-07 14:09:45 UTC

SUMMARY

KWin used to support XDG_SESSION_ID to specify the session to start on. Since https://invent.kde.org/plasma/kwin/-/commit/ade861d6de185cff9e49ec08dd95704f338eff4f this is no longer supported. This is a very useful way to launch KWin through ssh in gdb or through ssh on embedded hardware during the development face. Please see also my older blog post introducing this: https://blog.martin-graesslin.com/blog/2016/04/starting-kwinwayland-on-another-virtual-terminal/

STEPS TO REPRODUCE
1. Use weird vivante hardware which crashes KWin on startup
2. Set XDG_SESSION_ID to a started session
3. Launch KWin through gdb in ssh

OBSERVED RESULT
KWin doesn't start.


EXPECTED RESULT
KWin starts on the specified logind session.

Comment 1 Bug Janitor Service 2021-04-07 16:38:39 UTC

A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/835

Comment 2 David Edmundson 2021-04-26 09:37:36 UTC

Git commit 799db613817a458d9399f683f44b82d141746999 by David Edmundson.
Committed on 26/04/2021 at 09:37.
Pushed by davidedmundson into branch 'master'.

Restore following XDG_SESSION_ID env if set

Testing done:
Ran on a VT with an XDG_SESSION_ID from another terminal, ensured it
switched

M  +13   -5    src/session_logind.cpp

https://invent.kde.org/plasma/kwin/commit/799db613817a458d9399f683f44b82d141746999