major refactor: begin work to switch to GNOME and preservation

hosts/nero/configuration.nix

@@ -8,50 +8,12 @@
   imports = [
     ../shared/nixos-pc.nix
     ../../features/gnome.nix
-    ../../features/flatpak.nix
     ../../features/keyd.nix
   ];
 
-  nixpkgs.overlays = [
-    inputs.cheatengine.overlays.default
-  ];
-
   networking.hostName = "nero";
 
   services = {
-    xserver = {
-      videoDrivers = [ "nvidia" ];
-    };
-
-    flatpak = {
-      packages = [
-        {
-          appId = "com.discordapp.Discord";
-          origin = "flathub";
-        }
-        {
-          appId = "com.github.Matoking.protontricks";
-          origin = "flathub";
-        }
-        {
-          appId = "com.steamgriddb.SGDBoop";
-          origin = "flathub";
-        }
-        {
-          appId = "com.vysp3r.ProtonPlus";
-          origin = "flathub";
-        }
-        {
-          appId = "io.github.ryubing.Ryujinx";
-          origin = "flathub";
-        }
-        {
-          appId = "io.github.Amethyst.ModManager";
-          origin = "amethyst-mod-manager";
-        }
-      ];
-    };
-
     wivrn = {
       enable = true;
       openFirewall = true;
@@ -60,8 +22,6 @@
   };
 
   programs = {
-    gamemode.enable = true;
-
     steam = {
       enable = true;
       remotePlay.openFirewall = true;
@@ -98,19 +58,8 @@
 
   environment = {
     systemPackages = with pkgs; [
-      mangohud
-      gamescope
-      gamescope-wsi
-      cheatengine
-      lsfg-vk
-      lsfg-vk-ui
-      qbittorrent
       aseprite
-
-      inputs.scopebuddy.packages.${pkgs.stdenv.hostPlatform.system}.default
       inputs.xivlauncher-rb.packages.${pkgs.stdenv.hostPlatform.system}.default
-
-      (callPackage ../../packages/aseprite-thumbnailer-kde/package.nix { })
     ];
   };
 }

hosts/nero/disko.nix

@@ -0,0 +1,69 @@
+{
+  fileSystems."/nix".neededForBoot = true;
+
+  disko.devices = {
+    nodev = {
+      "/" = {
+        fsType = "tmpfs";
+
+        mountOptions = [
+          "size=25%"
+          "mode=755"
+        ];
+      };
+    };
+
+    disk.main = {
+      device = "/dev/nvme0n1";
+      type = "disk";
+
+      content = {
+        type = "gpt";
+
+        partitions = {
+          esp = {
+            name = "ESP";
+            size = "5G";
+            type = "EF00";
+
+            content = {
+              type = "filesystem";
+              format = "vfat";
+              mountpoint = "/boot";
+            };
+          };
+
+          root = {
+            name = "NIXOS";
+            size = "100%";
+
+            content = {
+              type = "btrfs";
+              extraArgs = [ "-f" ];
+
+              subvolumes = {
+                "/persist" = {
+                  mountOptions = [
+                    "subvol=persist"
+                    "noatime"
+                  ];
+
+                  mountpoint = "/persist";
+                };
+
+                "/nix" = {
+                  mountOptions = [
+                    "subvol=nix"
+                    "noatime"
+                  ];
+
+                  mountpoint = "/nix";
+                };
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}

hosts/nero/hardware.nix

@@ -9,7 +9,6 @@
 {
   imports = [
     (modulesPath + "/installer/scan/not-detected.nix")
-    ../shared/fs-layouts/single-disk-btrfs.nix
   ];
 
   boot = {
@@ -49,10 +48,8 @@
   hardware = {
     bluetooth.enable = true;
     cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
-    nvidia-container-toolkit.enable = true;
 
     nvidia = {
-      package = config.boot.kernelPackages.nvidiaPackages.latest;
       open = true;
       modesetting.enable = true;
     };

hosts/nero/preservation.nix

@@ -0,0 +1,23 @@
+{
+  boot.tmp.cleanOnBoot = true;
+
+  preservation = {
+    enable = true;
+
+    preserveAt."/persist" = {
+      files = [
+        {
+          file = "/etc/machine-id";
+          inInitrd = true;
+        }
+      ];
+      directories = [
+        "/var/lib/systemd/timers"
+        "/var/lib/nixos"
+        "/var/log"
+        "/var/lib/bluetooth"
+        "/tmp"
+      ];
+    };
+  };
+}