video 17

hosts/m3-kratos/default.nix

@@ -38,6 +38,7 @@
     ./configuration.nix
     ./secrets.nix
     ./services
+    ./specialisations.nix
   ];
   extraServices.podman.enable = true;
 }

hosts/m3-kratos/specialisations.nix

@@ -0,0 +1,83 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: {
+  specialisation = {
+    "HTTPD".configuration = {
+      system.nixos.tags = ["HTTPD"];
+      services.httpd.enable = true;
+      services.httpd.virtualHosts."foo.example.com" = {
+        documentRoot = "/var/www/foo";
+        extraConfig = ''
+          <Directory /var/www/foo>
+            Options Indexes FollowSymLinks MultiViews
+            AllowOverride None
+            Require all granted
+          </Directory>
+        '';
+      };
+    };
+    "NGINX".configuration = {
+      system.nixos.tags = ["NGINX"];
+      services.httpd.enable = false;
+      services.nginx.enable = true;
+      services.nginx.config = ''
+        http {
+          server {
+            listen 80;
+            server_name bar.example.com;
+
+            root /var/www/bar;
+
+            location / {
+              index index.html;
+            }
+          }
+        }
+      '';
+    };
+    "NVIDIA".configuration = {
+      boot.kernelParams = [
+        "nvidia.NVreg_PreserveVideoMemoryAllocations=1"
+        "nvidia-drm.modeset=1"
+      ];
+      system.nixos.tags = ["NVIDIA"];
+      services.xserver.videoDrivers = ["nvidia"];
+      hardware = {
+        nvidia = {
+          open = false;
+          package = config.boot.kernelPackages.nvidiaPackages.stable;
+          modesetting.enable = true;
+          powerManagement.enable = true;
+        };
+        graphics = {
+          enable = true;
+          enable32Bit = true;
+        };
+      };
+      environment.sessionVariables = {
+        GBM_BACKEND = "nvidia-drm";
+        __GLX_VENDOR_LIBRARY_NAME = "nvidia";
+        LIBVA_DRIVER_NAME = "nvidia";
+        QT_QPA_PLATFORM = "wayland";
+        WLR_NO_HARDWARE_CURSORS = "1";
+        XDG_SESSION_TYPE = "wayland";
+      };
+    };
+  };
+  environment.systemPackages = [
+    (pkgs.writeShellScriptBin "switch-spec" ''
+      if [ $# -ne 1 ]; then
+        echo "Usage: switch-spec <specialisation>"
+        exit 1
+      fi
+
+      sudo /nix/var/nix/profiles/system/specialisation/$1/bin/switch-to-configuration switch
+    '')
+  ];
+  environment.sessionVariables = lib.mkIf (config.specialisation != {}) {
+    SPECIALISATION = "NONE";
+  };
+}