Do not install gnome-firmware on non-graphical installs.

nix/configuration/hosts/neelix/default.nix

@@ -28,4 +28,5 @@
   me.graphical = true;
   me.graphics_card_type = "intel";
   me.kodi.enable = true;
+  me.lvfs.enable = true;
 }

nix/configuration/hosts/odo/default.nix

@@ -45,4 +45,5 @@
   me.latex.enable = true;
   me.launch_keyboard.enable = true;
   me.sway.enable = true;
+  me.lvfs.enable = true;
 }

nix/configuration/roles/lvfs/default.nix

@@ -8,26 +8,36 @@
 {
   imports = [ ];
 
-  config = lib.mkMerge [
+  options.me = {
-    {
+    lvfs.enable = lib.mkOption {
-      services.fwupd.enable = true;
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install lvfs.";
+    };
+  };
 
-      environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
+  config = lib.mkIf config.me.lvfs.enable (
-        hideMounts = true;
+    lib.mkMerge [
-        directories = [
+      {
-          {
+        services.fwupd.enable = true;
-            directory = "/var/lib/fwupd";
+        environment.persistence."/persist" = lib.mkIf (!config.me.buildingIso) {
-            user = "root";
+          hideMounts = true;
-            group = "root";
+          directories = [
-            mode = "0755";
+            {
-          }
+              directory = "/var/lib/fwupd";
+              user = "root";
+              group = "root";
+              mode = "0755";
+            }
+          ];
+        };
+      }
+      (lib.mkIf config.me.graphical {
+        environment.systemPackages = with pkgs; [
+          gnome-firmware
         ];
-      };
+      })
-    }
+    ]
-    (lib.mkIf config.me.graphical {
+  );
-      environment.systemPackages = with pkgs; [
-        gnome-firmware
-      ];
-    })
-  ];
 }