Nixpkgs: seafile-client: fails to launch due to `Could not find the Qt platform plugin "xcb"` in 20.03

[wucke13]

Describe the bug
The seafile-applet binary fails to launch in 20.03beta.

Output:

$ seafile-applet
qt.qpa.plugin: Could not find the Qt platform plugin "xcb" in ""
This application failed to start because no Qt platform plugin could be initialized. Reinstalling the application may fix this problem.

zsh: abort (core dumped)  seafile-applet

To Reproduce
Steps to reproduce the behavior:

1. Add seafile-client to environment.systemPackages
2. Start seafile-applet vis CLI

Expected behavior
The Seafile Applet starts without issues.

Additional context
This could be related to a missing wrapQtAppsHook, however the expression looks like it does include an alternative way of the hook.

Metadata

• system: "x86_64-linux"
• host os: Linux 5.5.5, NixOS, 20.03beta258.68df00b0ba6 (Markhor)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.3.2
• channels(root): "nixos-20.03beta258.68df00b0ba6, nixos-unstable-20.03pre206201.00915dcb631"
• channels(wucke13): "nixos-unstable-20.03pre211190.a21c2fa3ea2, nixpkgs-unstable-19.09pre170896.6e5caa3f8ac, nixos-unstable-small-19.03pre161392.50bb0afa7ce"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:
# a list of nixos modules affected by the problem
module:

[flokli]

Can you try to see if adding wrapQtAppsHook helps?

[worldofpeace]

Can you try to see if adding wrapQtAppsHook helps?

Fixing this now.

[wucke13]

That's a fast response, thank you both! Just wondering: Why didn't this occur earlier?

[worldofpeace]

It was large issue that a lot of qt apps in nixpkgs weren't packaged correctly https://github.com/NixOS/nixpkgs/issues/65399. Hopefully people will read the qt section of the manual now, since it's always been to do https://github.com/worldofpeace/nixpkgs/commit/43bb5bffda01e7a6e7c18d24f755b729b43b957a

[wucke13]

@worldofpeace Oh, I'm well aware of the Qt Apps problem in general. What I'm wondering is why I did not run into this issue before 20.03. I'm using seafile since 17.03, and I'm not using a Qt DE that circumvents the problem, so I'm wondering why this problem ocured first in 20.03.

[worldofpeace]

Me trying to run it from nixos-unstable results in

qt.glx: qglx_findConfig: Failed to finding matching FBConfig (8 8 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 8 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 1 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 1 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (8 8 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 8 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 8 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 1 0)
qt.glx: qglx_findConfig: Failed to finding matching FBConfig (1 1 1 0)
Could not initialize GLX

I'm using seafile since 17.03, and I'm not using a Qt DE that circumvents the problem, so I'm wondering why this problem ocured first in 20.03.

That is indeed strange.

[worldofpeace]

@wucke13 I figured out the timeline and why you just now experienced this issue https://github.com/NixOS/nixpkgs/pull/80982#issuecomment-591186751.