Initialize nix-darwin config for darwinix

system/darwinix/default.nix

@@ -0,0 +1,65 @@
+{
+  self,
+  lib,
+  mylib,
+  pkgs,
+  username,
+  config,
+  inputs,
+  publicKeys,
+  ...
+}: {
+  nix = {
+    package = pkgs.nixVersions.stable;
+    extraOptions = ''
+      experimental-features = nix-command flakes pipe-operators
+    '';
+
+    settings.trusted-users = ["root" "${username}"];
+
+    gc.automatic = false;
+    gc.options = "--delete-older-than 5d";
+    settings.auto-optimise-store = true;
+    optimise.automatic = true;
+
+    registry = lib.mapAttrs' (n: v: lib.nameValuePair n {flake = v;}) inputs;
+
+    nixPath = [
+      "nixpkgs=${inputs.nixpkgs.outPath}"
+      "home-manager=${inputs.home-manager.outPath}"
+    ];
+  };
+
+  users.users.${username} = {
+    isHidden = false;
+    description = "Christoph";
+    home = "/Users/${username}";
+    createHome = false;
+
+    # NOTE: Not set if the user already exists on darwin, so use chsh for the root user
+    shell = pkgs.fish;
+
+    openssh.authorizedKeys.keys = [
+      publicKeys.${username}.ssh
+    ];
+
+    # packages = with pkgs; [];
+  };
+
+  environment.systemPackages = with pkgs; [
+    alejandra
+    neovim
+    wget
+  ];
+
+  programs = {
+    fish.enable = true;
+  };
+
+  # Set Git commit hash for darwin-version.
+  # system.configurationRevision = self.rev or self.dirtyRev or null;
+
+  # Used for backwards compatibility, please read the changelog before changing.
+  # $ darwin-rebuild changelog
+  system.stateVersion = 6;
+}

system/default.nix

@@ -276,7 +276,7 @@ with mylib.networking; {
     shell = pkgs.fish;
 
     openssh.authorizedKeys.keys = [
-      publicKeys.christoph.ssh
+      publicKeys.${username}.ssh
     ];
 
     # We do this with HomeManager