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Your First Flake

Create your first conformant flake with Weyl Standard.

Your First Flake

The Minimal Conformant Flake

{
  description = "My weyl-std project";


  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-parts.url = "github:hercules-ci/flake-parts";
    weyl-std.url = "github:weyl-ai/weyl-std";
  };


  outputs = inputs@{ flake-parts, weyl-std, ... }:
    flake-parts.lib.mkFlake { inherit inputs; } {
      imports = [ weyl-std.flakeModules.default ];


      systems = [ "x86_64-linux" "aarch64-linux" ];


      perSystem = { pkgs, ... }: {
        packages.default = pkgs.hello;
        devShells.default = pkgs.mkShell {
          packages = [ pkgs.hello ];
        };
      };
    };


  nixConfig = {
    extra-substituters = [ "https://weyl-ai.cachix.org" ];
    extra-trusted-public-keys = [
      "weyl-ai.cachix.org-1:cR0SpSAPw7wejZ21ep4SLojE77gp5F2os260eEWqTTw="
    ];
  };
}

What weyl-std Provides

When you import weyl-std.flakeModules.default, you get:

ModuleDescription
formattertreefmt with nixfmt, ruff, shfmt, etc.
nixpkgsCentral nixpkgs config with CUDA support
stdOverlays and library functions
devshellDevelopment shell utilities

Adding a Package

Create nix/packages/my-tool.nix:

{ lib, stdenv }:
stdenv.mkDerivation (finalAttrs: {
  pname = "my-tool";
  version = "0.1.0";


  src = ../../src;


  meta = {
    description = "My tool";
    license = lib.licenses.mit;
    mainProgram = "my-tool";
  };
})

Then in your flake module:

perSystem = { pkgs, ... }: {
  packages.my-tool = pkgs.callPackage ./nix/packages/my-tool.nix { };
};

Enabling CUDA

imports = [ weyl-std.flakeModules.default ];


weyl-std.nixpkgs.cuda.enable = true;

This configures nixpkgs with:

Next Steps