Extract shared NixOS/Darwin base config into roles/common.nix

Create roles/common.nix containing shared configuration between NixOS and
Darwin: timezone, base packages (git, glances, pciutils, tree, usbutils, vim),
nix settings (experimental-features, max-jobs, trusted-users), gc config,
and allowUnfree setting.

Both roles/default.nix and roles/darwin.nix now import common.nix and only
contain platform-specific configuration.

machines/wixos/configuration.nix

@@ -17,15 +17,6 @@
       enable = true;
       wayland = true;
     };
-    nvidia = {
-      enable = true;
-      package = "latest";
-      graphics.extraPackages = with pkgs; [
-        mesa
-        libvdpau-va-gl
-        libva-vdpau-driver
-      ];
-    };
     users.enable = true;
   };
 
@@ -38,13 +29,28 @@
   wsl.wslConf.network.hostname = "wixos";
   wsl.wslConf.user.default = "johno";
 
-  # WSL-specific environment variables for graphics
+  services.xserver.videoDrivers = [ "nvidia" ];
+  hardware.graphics = { 
+    enable = true;
+
+    extraPackages = with pkgs; [
+      mesa
+      libvdpau-va-gl
+      libva-vdpau-driver
+    ];
+  };
   environment.sessionVariables = {
     LD_LIBRARY_PATH = [
       "/usr/lib/wsl/lib"
       "/run/opengl-driver/lib"
     ];
   };
+  hardware.nvidia = {
+    modesetting.enable = true;
+    nvidiaSettings = true;
+    open = true;
+    package = config.boot.kernelPackages.nvidiaPackages.latest;
+  };
 
   # This value determines the NixOS release from which the default
   # settings for stateful data, like file locations and database versions

machines/zix790prors/configuration.nix

@@ -26,10 +26,7 @@ with lib;
       x11 = true;
     };
     nfs-mounts.enable = true;
-    nvidia = {
-      enable = true;
-      graphics.enable32Bit = true;
-    };
+    nvidia.enable = true;
     printing.enable = true;
     remote-build.enableBuilder = true;
     users.enable = true;
@@ -50,11 +47,27 @@ with lib;
   # Fix dual boot clock sync - tell Linux to use local time for hardware clock
   time.hardwareClockInLocalTime = true;
 
+  # NVIDIA Graphics configuration
+  services.xserver.videoDrivers = [ "nvidia" ];
+  hardware.graphics.enable = true;
+  hardware.graphics.enable32Bit = true;
+  
   # Set DP-0 as primary display with 164.90Hz refresh rate
   services.xserver.displayManager.sessionCommands = ''
     ${pkgs.xorg.xrandr}/bin/xrandr --output DP-0 --mode 3440x1440 --rate 164.90 --primary
   '';
 
+  hardware.nvidia = {
+    modesetting.enable = true;
+    nvidiaSettings = true;
+    package = pkgs.linuxPackages.nvidiaPackages.stable;
+    open = true;
+    
+    # For gaming performance
+    powerManagement.enable = false;
+    powerManagement.finegrained = false;
+  };
+
   services.ollama = {
     enable = true;
     acceleration = "cuda";

roles/common.nix

@@ -0,0 +1,35 @@
+# Common configuration shared between NixOS and Darwin
+{ lib, pkgs, ... }:
+
+{
+  config = {
+    time.timeZone = "America/Los_Angeles";
+
+    environment.systemPackages = with pkgs; [
+      git
+      glances
+      pciutils
+      tree
+      usbutils
+      vim
+    ];
+
+    nix = {
+      package = pkgs.nix;
+      settings = {
+        experimental-features = [ "nix-command" "flakes" ];
+        max-jobs = "auto";
+        trusted-users = [ "johno" ];
+        substituters = [
+        ];
+      };
+
+      gc = {
+        automatic = true;
+        options = "--delete-older-than 10d";
+      };
+    };
+
+    nixpkgs.config.allowUnfree = true;
+  };
+}

roles/darwin.nix

@@ -7,6 +7,10 @@ let
   setEnvironmentPath = "${config.system.build.setEnvironment}";
 in
 {
+  imports = [
+    ./common.nix
+  ];
+
   config = {
     # Salt manages /etc/bashrc, /etc/zshrc, /etc/zshenv
     # nix-darwin writes to .local variants for nix-specific configuration
@@ -43,8 +47,6 @@ in
       fi
     '';
 
-    time.timeZone = "America/Los_Angeles";
-
     # System preferences
     system.defaults = {
       # Custom keyboard shortcuts
@@ -79,42 +81,5 @@ in
         };
       };
     };
-
-    environment.systemPackages = with pkgs; [
-      git
-      glances
-      pciutils
-      tree
-      usbutils
-      vim
-    ];
-
-    nix = {
-      package = pkgs.nix;
-      # distributedBuilds = true;
-      # buildMachines = [{
-      #   hostName = "z790prors.oglehome";
-      #   system = "x86_64-linux";
-      #   protocol = "ssh-ng";
-      #   sshUser = "johno";
-      #   sshKey = "/root/.ssh/id_ed25519";
-      #   maxJobs = 3;
-      #   speedFactor = 2;
-      # }];
-      settings = {
-        experimental-features = [ "nix-command" "flakes" ];
-        max-jobs = "auto";
-        trusted-users = [ "johno" ];
-        substituters = [
-        ];
-      };
-
-      gc = {
-        automatic = true;
-        options = "--delete-older-than 10d";
-      };
-    };
-
-    nixpkgs.config.allowUnfree = true;
   };
 }

roles/default.nix

@@ -4,6 +4,7 @@ with lib;
 
 {
   imports = [
+    ./common.nix
     ./audio
     ./bluetooth
     ./btrfs
@@ -31,7 +32,6 @@ with lib;
       LC_TELEPHONE = "en_US.UTF-8";
       LC_TIME = "en_US.UTF-8";
     };
-    time.timeZone = "America/Los_Angeles";
 
     services.xserver.xkb = {
       layout = "us";
@@ -49,42 +49,7 @@ with lib;
     # Enable the OpenSSH daemon.
     services.openssh.enable = true;
 
-    environment.systemPackages = with pkgs; [
-      git
-      glances
-      pciutils
-      tree
-      usbutils
-      vim
-    ];
-
-    nix = {
-      package = pkgs.nix;
-      # distributedBuilds = true;
-      # buildMachines = [{
-      #   hostName = "z790prors.oglehome";
-      #   system = "x86_64-linux";
-      #   protocol = "ssh-ng";
-      #   sshUser = "johno";
-      #   sshKey = "/root/.ssh/id_ed25519";
-      #   maxJobs = 3;
-      #   speedFactor = 2;
-      # }];
-      settings = {
-        experimental-features = [ "nix-command" "flakes" ];
-        max-jobs = "auto";
-        trusted-users = [ "johno" ];
-        substituters = [
-        ];
-      };
-
-      gc = {
-        automatic = true;
-        randomizedDelaySec = "14m";
-        options = "--delete-older-than 10d";
-      };
-    };
-
-    nixpkgs.config.allowUnfree = true;
+    # NixOS-specific gc option (not available on Darwin)
+    nix.gc.randomizedDelaySec = "14m";
   };
 }

roles/nvidia/default.nix

@@ -8,89 +8,9 @@ in
 {
   options.roles.nvidia = {
     enable = mkEnableOption "Enable the nvidia role";
-
-    # Driver configuration options
-    open = mkOption {
-      type = types.bool;
-      default = true;
-      description = "Use the open source nvidia kernel driver (for Turing and newer GPUs).";
-    };
-
-    modesetting = mkOption {
-      type = types.bool;
-      default = true;
-      description = "Enable kernel modesetting for nvidia.";
-    };
-
-    nvidiaSettings = mkOption {
-      type = types.bool;
-      default = true;
-      description = "Enable the nvidia-settings GUI.";
-    };
-
-    package = mkOption {
-      type = types.enum [ "stable" "latest" "beta" "vulkan_beta" "production" ];
-      default = "stable";
-      description = "The nvidia driver package to use.";
-    };
-
-    powerManagement = {
-      enable = mkOption {
-        type = types.bool;
-        default = false;
-        description = "Enable nvidia power management (useful for laptops, not recommended for desktops).";
-      };
-
-      finegrained = mkOption {
-        type = types.bool;
-        default = false;
-        description = "Enable fine-grained power management for Turing and newer GPUs.";
-      };
-    };
-
-    graphics = {
-      enable = mkOption {
-        type = types.bool;
-        default = true;
-        description = "Enable hardware graphics support.";
-      };
-
-      enable32Bit = mkOption {
-        type = types.bool;
-        default = false;
-        description = "Enable 32-bit graphics libraries (needed for some games).";
-      };
-
-      extraPackages = mkOption {
-        type = types.listOf types.package;
-        default = [];
-        description = "Extra packages to add to hardware.graphics.extraPackages.";
-      };
-    };
   };
 
   config = mkIf cfg.enable {
-    # Set xserver video driver
-    services.xserver.videoDrivers = [ "nvidia" ];
-
-    # Graphics configuration
-    hardware.graphics = {
-      enable = cfg.graphics.enable;
-      enable32Bit = cfg.graphics.enable32Bit;
-      extraPackages = cfg.graphics.extraPackages;
-    };
-
-    # NVIDIA driver configuration
-    hardware.nvidia = {
-      modesetting.enable = cfg.modesetting;
-      nvidiaSettings = cfg.nvidiaSettings;
-      open = cfg.open;
-      package = config.boot.kernelPackages.nvidiaPackages.${cfg.package};
-      powerManagement.enable = cfg.powerManagement.enable;
-      powerManagement.finegrained = cfg.powerManagement.finegrained;
-    };
-
-    # Additional packages for nvidia support
     environment.systemPackages = with pkgs; [
       libva-utils
       nvidia-vaapi-driver