unityhub: blank login screen makes it impossible to access editor

[benpence]

Describe the bug

Trying to open the login window on a recent unityhub gives a blank white screen instead.

Not sure if it's a Unity issue or some weird state on my machine... just wanted to know if anyone else's unityhub is broken.

Steps To Reproduce

1. Use recent (~2021-10-28) commit on unstable in configuration.nix to install unityhub package:

   { pkgs, options, ... }:
   let
     unstable = import <unstable> {
       config.allowUnfree = true;
     };
     # ...
   in {
     # ...
     environment.systemPackages = with pkgs; [
       # ...
       unstable.unityhub
     ];
   }

   $ sudo nixos-rebuild switch

   $ readlink -f $(which unityhub)
   /nix/store/rd18f1yc552wsbpqnfjhrviqmw173vl6-unityhub/bin/unityhub

2. Run unityhub (process continues to live after printing these lines):

   $ unityhub
   Fontconfig warning: "/usr/share/fontconfig/conf.avail/05-reset-dirs-sample.conf", line 6: unknown element "reset-dirs"
   Checking for update
   Found version 2.4.5 (url: UnityHub.AppImage)
   Downloading update from UnityHub.AppImage
   updater cache dir: /home/ben/.cache/unityhub-updater
   No cached update info available
   Error: Error: APPIMAGE env is not defined
       at newError (/nix/store/2njkbzasgj4bznk58azcv6jhdmb3p8zk-unityhub-extracted/resources/app.asar/node_modules/builder-util-runtime/out/index.js:212:17)
       at Object.task (/nix/store/2njkbzasgj4bznk58azcv6jhdmb3p8zk-unityhub-extracted/resources/app.asar/node_modules/electron-updater/out/AppImageUpdater.js:106:52)
       at AppImageUpdater.executeDownload (/nix/store/2njkbzasgj4bznk58azcv6jhdmb3p8zk-unityhub-extracted/resources/app.asar/node_modules/electron-updater/out/AppUpdater.js:741:25)

3. Run another unityhub process on a separate terminal because for some reason the first process doesn't open it:

   $ unityhub
   $ 

4. I try to log into Unity, but I am greeted with a blank window:

Expected behavior

Some webpage will load that lets me login.

Additional context

• I've looked at the inspector in the Electron app. No errors anywhere.
• Threads on the Unity forums [1] suggest this has happened before to many people over the years on various operating systems and was fixed by clearing cached files from previous unityhub runs/installs. I used strace to figure out some of the directories and deleted ~/.config/UnityHub, ~/.cache/unityhub-updater, and ~/.cache/mesa_shader_cache, but it did not help.
• Unfortunately, I GC'd previous nix builds, but I tried installing unityhub at unstable commits just before changes to pkgs/development/tools/unityhub/default.nix, with no change in behavior.

Metadata

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 5.4.122, NixOS, 20.09.4393.068984c00e0 (Nightingale)`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.3.11`
 - channels(ben): `""`
 - channels(root): `"unstable-21.11pre325602.51acb65b302, nixos-20.09.4393.068984c00e0, nixos-20.03-20.03.3330.1db42b7fe38, nixos-20.09-20.09.4393.068984c00e0"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos

[stale[bot]]

I marked this as stale due to inactivity. → More info