[question] How to add pre-commit hooks to nixos flake configuration?

[cronyakatsuki]

Hello, I have been trying out pre-commit hooks and am interested how would I be going around adding it to my nixos flake configuration?

I have tried out this with the flake only, but get the next error:

flake.nix

{
description = "Nixos config flake";

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

pre-commit-hooks.url = "github:cachix/pre-commit-hooks.nix";

flake-utils.url = "github:numtide/flake-utils";

home-manager = {
  url = "github:nix-community/home-manager";
  inputs.nixpkgs.follows = "nixpkgs";
};

nixvim = {
  url = "github:nix-community/nixvim";
  inputs.nixpkgs.follows = "nixpkgs";
};

hb-downloader = {
  url = "git+file:///home/crony/Documents/develop/hb-downloader";
  inputs.nixpkgs.follows = "nixpkgs";
};

};

outputs = inputs@{ self, nixpkgs, flake-utils, pre-commit-hooks, home-manager , ... }: { nixosConfigurations = { default = nixpkgs.lib.nixosSystem { system = "x86_64-linux"; modules = [ ./nixos/configuration.nix

        home-manager.nixosModules.home-manager
        {
          home-manager.useGlobalPkgs = true;
          home-manager.extraSpecialArgs = { inherit inputs; };
          home-manager.users.crony = {
            imports = [ ./home-manager/home.nix ];
          };
        }
        flake-utils.lib.eachDefaultSystem
        (system: {
          checks = {
            pre-commit-check = pre-commit-hooks.lib.${system}.run {
              src = ./.;
              hooks = { nixpkgs-fmt.enable = true; };
            };
          };
          devShell = nixpkgs.legacyPackages.${system}.mkShell {
            inherit (self.checks.${system}.pre-commit-check) shellHook;
          };
        })
      ];
    };
  };
};

}

> error
```console
error:
       … while checking flake output 'nixosConfigurations'

         at /nix/store/8c26jqrhnk2iw0hynh3jr9gy7yixz819-source/flake.nix:29:7:

           28|     , ... }: {
           29|       nixosConfigurations = {
             |       ^
           30|         default = nixpkgs.lib.nixosSystem {

       … while checking the NixOS configuration 'nixosConfigurations.default'

         at /nix/store/8c26jqrhnk2iw0hynh3jr9gy7yixz819-source/flake.nix:30:9:

           29|       nixosConfigurations = {
           30|         default = nixpkgs.lib.nixosSystem {
             |         ^
           31|           system = "x86_64-linux";

       (stack trace truncated; use '--show-trace' to show the full trace)

       error: attempt to call something which is not a function but a set

       at /nix/store/na7sykizsgkzh9i3wc8m8pz5xfqib2rv-source/lib.nix:36:17:

           35|         let
           36|           ret = f system;
             |                 ^
           37|           op = attrs: key: attrs //

I'm still new to nix and flakes, so would like some help. The flake is located in my user directory.

[cronyakatsuki]

Fixed by adding a simple shell.nix and making a shell environment.