Bug 13878

Summary:	xserver-nodm-init: broken XDG_RUNTIME_DIR setup
Product:	[Build System, Metadata & Runtime] OE-Core	Reporter:	tf <tf+bugs.yocto>
Component:	graphics	Assignee:	Ross Burton <ross.burton>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	Medium+	CC:	meta.mr.watcher, meta.watcher, randy.macleod, ross.burton
Version:	unspecified
Target Milestone:	5.2 M3
Hardware:	x86
OS:	Multiple
Whiteboard:
OS type for building Yocto:	---	Type of Regression:	---
Verified:		Documentation change:	No (bug/feature does not impact docs)

Description tf 2020-04-17 03:40:17 UTC

The 13xdgbasedirs.sh needs to setup XDG_RUNTIME_DIR in a spec compliant way. The comment in the existing script says: 

'Wayland needs XDG_RUNTIME_DIR, so set it to /tmp.  This isn't compliant with the specification (wrong mode, wrong owner) but it's mostly sufficient.'

Unfortunately, this assumption doesn't hold, because some system components will, correctly, ignore the directory if the owner and permissions are not correct, while others will not, and things break. For example, GIO DBus code falls into the former category, while dconf into the latter, and consequently GSettings with a dconf backend don't work.

Either this directory needs to be set up correctly, or the variable should not be set at all.

Comment 1 Ross Burton 2024-10-10 12:02:09 UTC

The spec is at https://specifications.freedesktop.org/basedir-spec/latest/.

Interesting prior art to solve this in a non-horrible manner:

https://github.com/ifreund/dumb_runtime_dir
https://github.com/linux-pam/linux-pam/issues/416
https://www.gsp.com/cgi-bin/man.cgi?section=8&topic=PAM_XDG

Comment 2 Ross Burton 2024-10-10 14:03:53 UTC

Or https://github.com/jjk-jacky/pam_rundir.

Comment 3 Ross Burton 2025-03-04 11:13:04 UTC

Patches on the list.

Comment 4 Ross Burton 2025-04-03 12:02:26 UTC

Fixed in 5c98609bf7dfb05af722e30adb49731727df9a94.