Nixpkgs: mirage doesn't start in plasma DE - incompatible Qt version

[ZerataX]

Describe the bug
looks like #37864

~ 05:25:29 | Got library name:  "/nix/store/gwb3nsc2gaphv4wapri50plhrrcincg2-pyotherside-1.5.9/lib/qt-5.14.2/qml/io/thp/pyotherside/libpyothersideplugin.so"
F 05:25:29 | Cannot mix incompatible Qt library (version 0x50c07) with this library (version 0x50e02)

It does start on gnome, but when I log into plasma it crashes like that.

To Reproduce
Steps to reproduce the behavior:

1. install mirage-im and use plasma as a desktop enviroment from different channels (e.g. plasma from stable and mirage from unstable, since it's not yet on stable)
2. start mirage

Expectation
I would expect to be able to use plasma and mirage at the same time.

Notify maintainers

@colemickens

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.57, NixOS, 20.09pre237781.32b46dd897a (Nightingale)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.7
• channels(root): "nixos-20.09pre237781.32b46dd897a"
• channels(kaine): "home-manager-20.03, nixpkgs-unstable-20.09pre239228.bd0e645f024"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute: mirage-im

[JJJollyjim]

Does clearing the QML cache work?

https://github.com/mirukana/mirage/issues/90

--

Edit: nevermind, this is probably a different issue?

[JJJollyjim]

Hmm, I'm now suprised this issue doesn't show up for more qt packages.

As far as I can tell, mirage is correctly wrapped, but the wrapper script doesn't overwrite QT_PLUGIN_PATH, it prepends to it (thus it prepends to the one inherited from plasma). That means it ends up with both versions included. It runs successfully with QT_PLUGIN_PATH= mirage.

[JJJollyjim]

Someone with more knowledge of qt packaging might need to say what the correct approach is here

[ZerataX]

I think this is relevant #86369?

[doronbehar]

Could anyone check if https://github.com/NixOS/nixpkgs/pull/101369 fixes this? (It will take quiet some time to rebuild your system on top of it).

[sternenseemann]

mirage has been removed from nixpkgs due to being unmaintained.

[ZerataX]

@sternenseemann this is about mirage-im not mirage

https://github.com/mirukana/mirage
https://github.com/NixOS/nixpkgs/blob/master/pkgs/applications/networking/instant-messengers/mirage/default.nix

[doronbehar]

I am on Gnome so I can't help much in testing. @ZerataX when you are on a kde session, what's the output of env | grep QT ? I tested that the package doesn't get inputs of incompatible qt versions so I suspect this is a bug in the plasma nixos module or your setup / environment.