Marking WIP because I'm not confident in the patch changes and don't want to mislead-- leaving commit in case useful but until it's looked through more carefully I don't think it's ready. Don't want to break folks' sessions in a small way that causes pain later :).

Hello, could you bump this to version 5.15.1 ?

https://kde.org/announcements/plasma-5.15.1.php

Hello, could you bump this to version 5.15.1 ?

Thanks, updated!

Now with 5.15.2

As far as I can tell, 5.15.2 is working for me :) Maybe time to merge this?

Been working for me as well, across updates tracked here. Going ahead, thanks for testing!

This got to master now and the plasma test fails now. I suspect it's related to this update. In logs I newly see:

machine# [   38.594152] xsession[860]: /nix/store/mrwhgj95xjainwmp9dld9hzb1i8dm0jj-plasma-workspace-5.15.2-bin/bin/startkde: line 347: xmessage: command not found

but that one just disappeared when I added xorg.xmessage into test's systemPackages and did not fix the test, so these new lines seem closer to the cause

machine# [   38.561610] xsession[860]: /nix/store/mrwhgj95xjainwmp9dld9hzb1i8dm0jj-plasma-workspace-5.15.2-bin/bin/startkde: line 342: /nix/store/4p630wybyrzrggmjb5hm6c6nr19wq4g9-plasma-workspace-5.15.2/lib/libexec/kf5/start_kdeinit_wrapper: No such file or directory
machine# [   38.581609] xsession[860]: startkde: Could not start kdeinit5. Check your installation.

Any ideas?

relevant diff of startkde between 5.14.5 and 5.15.2 :

342c344
< LD_BIND_NOW=true /nix/store/4p630wybyrzrggmjb5hm6c6nr19wq4g9-plasma-workspace-5.15.2/lib/libexec/kf5/start_kdeinit_wrapper --kded +kcminit_startup
---
> LD_BIND_NOW=true /nix/store/iy34pfyzm86g7wmw6pqd36zjc8z2h3vm-kinit-5.54.0/lib/libexec/kf5/start_kdeinit_wrapper --kded +kcminit_startup

Maybe overriding this variable to the proper path would solve the issue : https://github.com/KDE/plasma-workspace/blob/c69acc0973a5a58de5f9ea0a25fa183b09bfe6b8/startkde/startkde.cmake#L252

Relevant variable in plasma-workspace package :

Found the problem, this line of patch is no longer applied :

Edit: testing a fix

@nyanloutre: are you planning to prepare a PR/patch against nixpkgs master?

@vcunat yes but if you already have something ready go ahead (I am currently building the plasma5 test on my machine)

No, on the contrary. I'm doing too many things already, so I'll be glad if someone else solves this one.

See #59112 for fix