adding modularity

hosts/spectre-x360-2018/configuration.nix

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+# Edit this configuration file to define what should be installed on
+# your system. Help is available in the configuration.nix(5) man page, on
+# https://search.nixos.org/options and in the NixOS manual (`nixos-help`).
+
+{ config, lib, pkgs, ... }:
+
+{
+  # imports =
+  #   [ # Include the results of the hardware scan.
+  #     ./hardware-configuration.nix
+  #   ];
+
+  # Use the "experimental" flakes for cleaner config
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nixpkgs.config.allowUnfree = true;
+
+  # Use the systemd-boot EFI boot loader.
+  # In this setup it is chain-loaded by REFInd (managed by Arch linux)
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = false;
+
+  # require the bcachefs modules to be loaded
+  boot.supportedFilesystems = [ "bcachefs" ];
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+
+  networking.hostName = "ArchNix"; # Define your hostname.
+  # Pick only one of the below networking options.
+  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
+  # networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.
+
+  # Set your time zone.
+  time.timeZone = "Europe/Berlin";
+
+  # Select internationalisation properties.
+  i18n.defaultLocale = "en_US.UTF-8";
+
+
+
+  # Define a user account. Don't forget to set a password with ‘passwd’.
+  users.users.remy = {
+    isNormalUser = true;
+    extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
+  };
+
+  # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
+  system.stateVersion = "24.05"; # Did you read the comment?
+
+}
+

hosts/spectre-x360-2018/default.nix

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+{lib, config, options, pkgs, ...}:
+{
+    # Merge the configuration and hardware configuration
+    imports = [
+        ./configuration.nix
+        ./hardware-configuration.nix
+        ../../modules/nixos/gdm.nix
+        ../../modules/nixos/pipewire.nix
+        ../../utils/binary-cache.nix
+        ../../utils/garbage-collection.nix
+
+    ];
+}

hosts/spectre-x360-2018/hardware-configuration.nix

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+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "nvme" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "UUID=5c920fe4-f3a6-4a64-a95f-1a2edaf1e0b6";
+      fsType = "bcachefs";
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/8F72-E888";
+      fsType = "vfat";
+      options = [ "fmask=0022" "dmask=0022" ];
+    };
+
+  swapDevices = [ ];
+
+  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
+  # (the default) this is the recommended approach. When using systemd-networkd it's
+  # still possible to use this option, but it's recommended to use it in conjunction
+  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
+  networking.useDHCP = lib.mkDefault true;
+  # networking.interfaces.enp0s20f0u2.useDHCP = lib.mkDefault true;
+  # networking.interfaces.wlp0s20f3.useDHCP = lib.mkDefault true;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+}