cuda binaries in nix-community cachix cache

[johnrizzo1]

After reviewing this with the cachix support folks it appears that nix-community does not have cuda enabled binaries for torch or tensorflow. This causes incredible compilation times while python and the dependencies are built. Is there any way to support cuda in nix-community. As an example when cudaSupport is enabled or tensorflow or torch are added as dependencies python gets completely rebuilt.

❯ cat devenv.nix
{ pkgs, lib, config, inputs, ... }:

{
  packages = with pkgs; [ 
    (python312.withPackages (ps: with ps; [
      torch
      tensorflow
    ]))
  ];

  languages.python.enable = true;
  languages.python.version = "3.12";

  cachix.enable = true;
  cachix.pull = [ "pre-commit-hooks" "nix-community" ];
  # See full reference at https://devenv.sh/reference/options/
}

❯ cat devenv.yaml
inputs:
  nixpkgs:
    url: github:cachix/devenv-nixpkgs/rolling
  nixpkgs-python:
    url: github:cachix/nixpkgs-python
    inputs:
      nixpkgs:
        follows: nixpkgs
  nixpkgs-unstable:
    url: github:nixos/nixpkgs/nixpkgs-unstable
allowUnfree: true
nixpkgs:
  cudaSupport: true

❯ cat /etc/nix/nix.conf      
# WARNING: this file is generated from the nix.* options in
# your NixOS configuration, typically
# /etc/nixos/configuration.nix.  Do not edit it!
allowed-users = *
auto-optimise-store = false
builders = 
cores = 24
experimental-features = nix-command flakes
max-jobs = auto
require-sigs = true
sandbox = true
sandbox-fallback = false
substituters = https://cache.nixos.org/ https://devenv.cachix.org https://nix-community.cachix.org
system-features = nixos-test benchmark big-parallel kvm nixos-test benchmark big-parallel kvm
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw= ai.cachix.org-1:N9dzRK+alWwoKXQlnn0H6aUx0lU/mspIoz8hMvGvbbc= nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs=
trusted-substituters = https://cache.nixos.org/ https://devenv.cachix.org https://nix-community.cachix.org
trusted-users = root some-user
extra-sandbox-paths = 

❯ cachix --version          
cachix 1.7.9

❯ devenv --version
devenv 1.8.1 (x86_64-linux)

My question is, do you see something wrong with how I'm using cachix or can we ensure cuda enabled binaries are included in nix-community.

[zowoq]

Does this work?

nix-store --realise /nix/store/0vnp9n1b4dv65q4rl9x4hj27rszwx8wv-python3.13-torch-2.7.1

https://hydra.nix-community.org/build/6832799#tabs-details