Problem with nix-darwin

[YaroKasear]

I am having a problem getting this lib to work on Apple Silicon macOS with nix-darwin.

darwin-rebuild switch --flake ~/flakes/ yields error: flake 'git+file:///Users/yaro/flakes' does not provide attribute 'packages.aarch64-darwin.darwinConfigurations.Gwyn.system', 'legacyPackages.aarch64-darwin.darwinConfigurations.Gwyn.system' or 'darwinConfigurations.Gwyn.system'

My NixOS system has no problem at all with this. Am I missing something basic here?

flake.nix

{
  description = "The United Flake";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    nixos-hardware.url = "github:NixOS/nixos-hardware/master";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nix-index-database = {
      url = "github:Mic92/nix-index-database";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    sops-nix = {
      url = "github:Mic92/sops-nix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    nix-darwin = {
      url = "github:LnL7/nix-darwin";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    snowfall-lib = {
      url = "github:snowfallorg/lib";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    cowsay = {
      url = "github:snowfallorg/cowsay";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    wallpaper-generator = {
      url = "github:pinpox/wallpaper-generator";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = inputs:
    inputs.snowfall-lib.mkFlake {
      inherit inputs;
      src = ./.;

      snowfall = {
        meta = {
          name = "united-flake";
          title = "The United Flake";
        };
        namespace = "united";
      };

      channels-config = {
        allowUnfree = true;
      };

      systems.modules.nixos = with inputs; [
        home-manager.nixosModules.home-manager
        nixos-hardware.nixosModules.common-pc
        sops-nix.nixosModules.sops
      ];

      systems.modules.darwin = with inputs; [
        home-manager.darwinModules.home-manager
      ];

      systems.hosts.loki.modules = with inputs; [
        nixos-hardware.nixosModules.common-pc-ssd
        nixos-hardware.nixosModules.common-cpu-amd
        nixos-hardware.nixosModules.common-cpu-amd-pstate
        nixos-hardware.nixosModules.common-gpu-nvidia-nonprime
      ];

      homes.users."yaro@loki".modules = with inputs; [
        nix-index-database.hmModules.nix-index
        sops-nix.homeManagerModules.sops
      ];

      homes.users."yaro@Gwyn".modules = with inputs; [
        nix-index-database.hmModules.nix-index
        sops-nix.homeManagerModules.sops
      ];
    };
}

systems/aarch64-darwin/Gwyn/default.nix

{ lib, pkgs, inputs, system, target, format, virtual, systems, config, ... }:

{
  environment.systemPackages = with pkgs; [ ];

  services.nix-daemon.enable = true;
  nix.package = pkgs.nix;

  nix.settings.experimental-features = "nix-command flakes";

  programs = {
    gnupg.agent = {
      enable = true;
      enableSSHSupport = true;
    };
    zsh.enable = true; 
  };

  system.configurationRevision = config.rev or config.dirtyRev or null;

  system.stateVersion = 4;

  nixpkgs.hostPlatform = lib.mkDefault "aarch64-darwin";

  users.users.yaro = {
    home = "/Users/yaro";
    shell = pkgs.zsh;
  };
}

I checked your configs and templates and didn't see anything setting the system variable. I am still working on migrating to snowfall-lib, but as far as I can tell, this should work.

[jakehamilton]

Would you be able to push up this version of your config in a repo on GitHub so I can take a look?

[YaroKasear]

Would you be able to push up this version of your config in a repo on GitHub so I can take a look?

I have it up here. https://github.com/YaroKasear/flakes/tree/main

For now I've reverted on my MacBook back to my pre-snowfall-lib configuration so I can still keep things working there. This library works great on my NixOS box even though I haven't fully migrated yet.

[YaroKasear]

Would you be able to push up this version of your config in a repo on GitHub so I can take a look?

I have it up here. https://github.com/YaroKasear/flakes/tree/main

For now I've reverted on my MacBook back to my pre-snowfall-lib configuration so I can still keep things working there. This library works great on my NixOS box even though I haven't fully migrated yet.

I forgot to update it with the capitalized hostname "Gwyn" instead of "gwyn." But the problem I reported is the same.

[jakehamilton]

Did you make sure to git add the system when trying to build it for the first time? The only problem I found in the flake is that the nix-darwin input needs to be named darwin, but Snowfall Lib logs an error mentioning that.

I was able to clone the repo, change nix-darwin to darwin, and then run darwin-rebuild build --flake .#Gwyn.

[jakehamilton]

I'll also mention that you do not need to add the home-manager module manually. Snowfall Lib will already do that for you 👍

[YaroKasear]

Did you make sure to git add the system when trying to build it for the first time? The only problem I found in the flake is that the nix-darwin input needs to be named darwin, but Snowfall Lib logs an error mentioning that.

I was able to clone the repo, change nix-darwin to darwin, and then run darwin-rebuild build --flake .#Gwyn.

Changed this to 'darwin' and even went as far as a git commit, and no dice.

I tried your variant of the command: darwin-rebuild build --flake .#Gwyn and got:

building the system configuration...
error: flake 'git+file:///Users/yaro/flakes?ref=refs/heads/main&rev=729b2a2e53a7b71e8ef78c2eb6dd32c21905c5fe' does not provide attribute 'packages.aarch64-darwin.darwinConfigurations.Gwyn.system', 'legacyPackages.aarch64-darwin.darwinConfigurations.Gwyn.system' or 'darwinConfigurations.Gwyn.system'
       Did you mean gwyn?

So I tried darwin-rebuild build --flake .#gwyn and got error: cached failure of attribute 'darwinConfigurations.gwyn.system'

Seems like no matter what this thing hates my hostname.

[YaroKasear]

Did you make sure to git add the system when trying to build it for the first time? The only problem I found in the flake is that the nix-darwin input needs to be named darwin, but Snowfall Lib logs an error mentioning that. I was able to clone the repo, change nix-darwin to darwin, and then run darwin-rebuild build --flake .#Gwyn.

Changed this to 'darwin' and even went as far as a git commit, and no dice.

I tried your variant of the command: darwin-rebuild build --flake .#Gwyn and got:

building the system configuration...
error: flake 'git+file:///Users/yaro/flakes?ref=refs/heads/main&rev=729b2a2e53a7b71e8ef78c2eb6dd32c21905c5fe' does not provide attribute 'packages.aarch64-darwin.darwinConfigurations.Gwyn.system', 'legacyPackages.aarch64-darwin.darwinConfigurations.Gwyn.system' or 'darwinConfigurations.Gwyn.system'
       Did you mean gwyn?

So I tried darwin-rebuild build --flake .#gwyn and got error: cached failure of attribute 'darwinConfigurations.gwyn.system'

Seems like no matter what this thing hates my hostname.

Okay, so I rm -rv'd the whole thing and cloned a new copy and this one worked. I am starting to suspect I ran into an annoying "quirk" of macOS here.

[YaroKasear]

So what I think happened is the fact that macOS doesn't make its file system case sensitive by default, so that whenever I tried to rename 'gwyn' to 'Gwyn' or the other way, the filesystem basically ignored it, but Nix actually cares about this case sensitivity.

I really appreciate your help.

[jakehamilton]

Ah, I've run into that exact same problem before! It can certainly be difficult to diagnose. Glad you got things working!