Initialize nix-darwin config for darwinix

flake.nix

@@ -12,8 +12,12 @@
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     hardware.url = "github:nixos/nixos-hardware";
 
+    # Darwin
+    nix-darwin.url = "github:nix-darwin/nix-darwin/master";
+    nix-darwin.inputs.nixpkgs.follows = "nixpkgs";
+
     # NOTE: Update this after May and November
-    nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-25.05";
+    nixpkgs-stable.url = "github:nixos/nixpkgs/nixos-25.11";
 
     # Home Manager
     home-manager.url = "github:nix-community/home-manager";
@@ -91,12 +95,14 @@
   outputs = {
     self,
     nixpkgs,
+    nix-darwin,
     ...
   } @ inputs: let
     # Our configuration is buildable on the following system/platform.
     # Configs can support more than a single system simultaneously,
     # e.g. NixOS (linux) and MacOS (darwin) or Arm.
     system = "x86_64-linux";
+    darwinSystem = "aarch64-darwin";
 
     # We configure our global packages here.
     # Usually, "nixpkgs.legacyPackages.${system}" is used (and more efficient),
@@ -139,6 +145,19 @@
       ];
     };
 
+    darwinPkgs = import nixpkgs {
+      system = darwinSystem;
+
+      hostPlatform = darwinSystem;
+      config.allowUnfree = true;
+      config.allowUnfreePredicate = pkg: true;
+
+      overlays = [
+        # All my own overlays (derivations + modifications)
+        (import ./overlays {inherit inputs nixpkgs pkgs-stable;})
+      ];
+    };
+
     # My own library functions are imported here.
     # They are made available to the system and HM configs by inheriting mylib.
     mylib = import ./lib {
@@ -153,6 +172,12 @@
       inherit (nixpkgs) lib;
     };
 
+    darwinMylib = import ./lib {
+      inherit inputs;
+      inherit (nixpkgs) lib;
+      pkgs = darwinPkgs;
+    };
+
     # NOTE: Keep public keys here so they're easy to rotate
     publicKeys.christoph = {
       # /home/christoph/.ssh/id_ed25519.pub
@@ -177,6 +202,18 @@
     # Local shell for NixFlake directory
     devShells.${system}.default = import ./shell.nix {inherit pkgs;};
 
+    darwinConfigurations = {
+      darwinix = mylib.nixos.mkDrdawinConfigWithHomeManagerModule {
+        inherit publicKeys;
+
+        system = darwinSystem;
+        mylib = darwinMylib;
+        hostname = "darwinix";
+        username = "christoph";
+        extraModules = [];
+      };
+    };
+
     # We give each configuration a (host)name to choose a configuration when rebuilding.
     # This makes it easy to add different configurations (e.g. for a laptop).
     # Usage: sudo nixos-rebuild switch --flake .#nixinator

home/christoph/darwinix/default.nix

@@ -0,0 +1,185 @@
+{
+  pkgs,
+  nixosConfig,
+  config,
+  lib,
+  mylib,
+  username,
+  inputs,
+  ...
+}: {
+  home = {
+    inherit username;
+
+    homeDirectory = "/Users/${config.home.username}";
+    enableNixpkgsReleaseCheck = true;
+
+    packages = with pkgs; [
+      (ripgrep.override {withPCRE2 = true;})
+      gdu
+      duf
+      sd
+
+      cachix
+    ];
+
+    stateVersion = "25.11";
+  };
+
+  programs = {
+    home-manager.enable = true;
+
+    # TODO: Module
+    fastfetch = {
+      enable = true;
+
+      settings = {
+        logo = {
+          padding = {
+            top = 4;
+            left = 1;
+            right = 2;
+          };
+        };
+
+        display = {
+          separator = "";
+          key.width = 17;
+        };
+
+        # Box Drawing: ╭ ─ ╮ ╰ ╯ │
+        modules = [
+          # Title
+          {
+            type = "title";
+            format = "{#1}╭─── {#}{user-name-colored}";
+          }
+
+          # System Information
+          {
+            type = "custom";
+            format = "{#1}│ {#}System Information";
+          }
+          {
+            type = "os";
+            key = "{#separator}│  {#keys}󰍹 OS";
+          }
+          {
+            type = "kernel";
+            key = "{#separator}│  {#keys}󰒋 Kernel";
+          }
+          {
+            type = "bootmgr";
+            key = "{#separator}│  {#keys}󰒋 BootMGR";
+          }
+          {
+            type = "uptime";
+            key = "{#separator}│  {#keys}󰅐 Uptime";
+          }
+          {
+            type = "packages";
+            key = "{#separator}│  {#keys}󰏖 Packages";
+            # format = "{all}";
+          }
+          {
+            type = "custom";
+            format = "{#1}│";
+          }
+
+          # Desktop Environment
+          {
+            type = "custom";
+            format = "{#1}│ {#}Desktop Environment";
+          }
+          {
+            type = "de";
+            key = "{#separator}│  {#keys}󰧨 DE";
+          }
+          {
+            type = "wm";
+            key = "{#separator}│  {#keys}󱂬 WM";
+          }
+          {
+            type = "wmtheme";
+            key = "{#separator}│  {#keys}󰉼 Theme";
+          }
+          {
+            type = "display";
+            key = "{#separator}│  {#keys}󰹑 Resolution";
+          }
+          {
+            type = "shell";
+            key = "{#separator}│  {#keys}󰞷 Shell";
+          }
+          {
+            type = "terminalfont";
+            key = "{#separator}│  {#keys}󰛖 Font";
+          }
+          {
+            type = "icons";
+            key = "{#separator}│  {#keys} Icons";
+          }
+          {
+            type = "cursor";
+            key = "{#separator}│  {#keys}󰆽 Cursor";
+          }
+          {
+            type = "custom";
+            format = "{#1}│";
+          }
+
+          # Hardware Information
+          {
+            type = "custom";
+            format = "{#1}│ {#}Hardware Information";
+          }
+          {
+            type = "board";
+            key = "{#separator}│  {#keys} Board";
+          }
+          {
+            type = "cpu";
+            key = "{#separator}│  {#keys}󰻠 CPU";
+          }
+          {
+            type = "gpu";
+            key = "{#separator}│  {#keys}󰢮 GPU";
+          }
+          {
+            type = "memory";
+            key = "{#separator}│  {#keys}󰍛 Memory";
+          }
+          # {
+          #   type = "disk";
+          #   key = "{#separator}│  {#keys}󰋊 Disk (/)";
+          #   folders = "/";
+          # }
+          # {
+          #   type = "disk";
+          #   key = "{#separator}│  {#keys}󰋊 Disk (~/Games)";
+          #   folders = "/home/christoph/Games";
+          # }
+          {
+            type = "btrfs";
+            key = "{#separator}│  {#keys}󰋊 BTRFS";
+          }
+          {
+            type = "custom";
+            format = "{#1}│";
+          }
+
+          # Colors Footer
+          {
+            type = "colors";
+            key = "{#separator}╰─── {#1}";
+            keyWidth = 6;
+            symbol = "circle";
+          }
+        ];
+      };
+    };
+  };
+
+  services = {
+  };
+}

lib/default.nix

@@ -1,13 +1,14 @@
 {
   inputs,
   pkgs,
+  darwinPkgs,
   lib,
   ...
 }: {
   # Import my own library functions.
   # Those are defined as functions returning sets of library functions,
   # so those functions have to be called when importing.
-  nixos = import ./nixos.nix {inherit inputs pkgs lib;};
+  nixos = import ./nixos.nix {inherit inputs pkgs darwinPkgs lib;};
   modules = import ./modules.nix {inherit inputs pkgs lib;};
   networking = import ./networking.nix {inherit inputs pkgs lib;};
   rofi = import ./rofi.nix {inherit inputs pkgs lib;};

lib/nixos.nix

@@ -1,6 +1,7 @@
 {
   inputs,
   pkgs,
+  darwinPkgs,
   lib,
   ...
 }: {
@@ -80,6 +81,81 @@
       ];
     };
 
+  mkDarwinConfigWithHomeManagerModule = {
+    system,
+    mylib,
+    hostname,
+    username,
+    publicKeys,
+    extraModules ? [],
+  }:
+    inputs.nix-darwin.lib.darwinSystem {
+      inherit system;
+
+      # Values in "specialArgs" are propagated to all system modules.
+      specialArgs = {
+        inherit inputs system hostname mylib username publicKeys;
+      };
+
+      modules = builtins.concatLists [
+        [
+          # Replace the default "pkgs" with my configured version
+          # to allow installation of unfree software and my own overlays.
+          {nixpkgs.pkgs = darwinPkgs;}
+
+          # Import the toplevel system configuration module.
+          # ../system # TODO:
+          ../system/cachix.nix
+
+          # Host specific configuration
+          ../system/${hostname}
+
+          # Import all of my custom system modules
+          # ../system/systemmodules # TODO:
+        ]
+
+        extraModules
+
+        # HM is installed as a system module when using mkNixosConfigWithHomeManagerModule.
+        [
+          inputs.home-manager.darwinModules.home-manager
+          {
+            home-manager = {
+              # Values in "extraSpecialArgs" are propagated to all HM modules.
+              extraSpecialArgs = {
+                inherit inputs system hostname mylib username publicKeys;
+              };
+
+              # Use the "pkgs" from the system configuration.
+              # This disables "nixpkgs.*" options in HM modules.
+              useGlobalPkgs = true;
+
+              # Packages in "users.${username}.packages" will be installed
+              # to /etc/profiles instead of ~/.nix-profile.
+              useUserPackages = true;
+
+              users.${username}.imports = [
+                # Import the user-specific HM toplevel module.
+                # It will be merged with the main config (like all different modules).
+                # Settings regarding a specific host (e.g. desktop or laptop)
+                # should only be made in the host-specific config.
+                # ../home/${username} # TODO:
+
+                # Host specific configuration
+                ../home/${username}/${hostname}
+              ];
+
+              sharedModules = [
+                # Import all of my custom HM modules.
+                # Putting them into sharedModules enables correct nixd completions.
+                # ../home/homemodules # TODO:
+              ];
+            };
+          }
+        ]
+      ];
+    };
+
   mkNixosSystemConfig = {
     system,
     mylib,

system/darwinix/default.nix

@@ -0,0 +1,49 @@
+{
+  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}"
+    ];
+  };
+
+  environment.systemPackages = with pkgs; [
+    wget
+    alejandra
+  ];
+
+  programs = {
+    fish.enable = true;
+    neovim.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