The option `hardware.graphics' does not exist

[Thatoo]

Everything was working till last week-end I guess.
Today, i did

sudo nix flake update
sudo nixos-rebuild switch --show-trace --flake

and it failed with

error:
       … while calling the 'seq' builtin

         at /nix/store/sj9yrq21wbbfr5715hys3laa2qd6x471-source/lib/modules.nix:322:18:

          321|         options = checked options;
          322|         config = checked (removeAttrs config [ "_module" ]);
             |                  ^
          323|         _module = checked (config._module);

       … while calling the 'throw' builtin

         at /nix/store/sj9yrq21wbbfr5715hys3laa2qd6x471-source/lib/modules.nix:298:18:

          297|                     ''
          298|             else throw baseMsg
             |                  ^
          299|         else null;

       error: The option `hardware.graphics' does not exist. Definition values:
       - In `/nix/store/sv3hw54ha6n92nrh5f8ki3vb602q52w8-source/nixos/cosmic-greeter/module.nix':
           {
             _type = "if";
             condition = false;
             content = {
               enable = true;
           ...

Any idea what it could be?

[lilyinstarlight]

Yes, due to upstream requiring a newer rustc than nixpkgs intends to backport to stable, 24.05 support has been dropped here. You'll need nixos-unstable going foward

[Thatoo]

Something like

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    nixpkgs_unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

isn't possible?

[lilyinstarlight]

Something like

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    nixpkgs_unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

isn't possible?

I mean if you use nixpkgs_unstable.lib.nixosSystem then that could work I guess. The important bit is that your system is built against nixos-unstable rather than whatever your flake inputs ultimately have

[Thatoo]

Thank you even though that's sad. I wish Gnome specialisation and software packages could be stable and only cosmic sepcialisation could be unstable...

[lilyinstarlight]

Yeah it is, I would have continued making it work with both, but cosmic upstream bumped rustc version to the most recently released version and nixpkgs has stated they don't want to backport that version to stable :/

[lilyinstarlight]

Fortunately nixos-unstable isn't that much different than stable for desktop/workststion use-case aside from software generally being newer

[Thatoo]

Thank you for your work, your effort, your time and your explanation.

[drakon64]

@Thatoo Support for NixOS Stable was re-added in 39c6d79

[Tommimon]

@Thatoo Support for NixOS Stable was re-added in 39c6d79

Do caches work for you when using NixOS Stable? I have to compile all the Cosmic components.

[drakon64]

Caches work fine for me on Stable

[Tommimon]

I can confirm that after following the instructions correctly and running nixos-rebuild test before adding any Cosmic related option to the configuration it worked, sorry for the noise.