Init:start-nix

hosts/example/default.nix

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+{
+  lib,
+  pkgs,
+  username,
+  ...
+}: {
+  imports =
+    [
+      ./hardware.nix
+    ]
+    ++ lib.filesystem.listFilesRecursive ../../modules;
+
+  # Define users
+  # If use nixos-anywhere to install, hashedPassword should be declared before installation
+  users = {
+    # users.root = {
+    #   hashedPassword = "xxxxxx"; could be generated by mkpasswd
+    # };
+    users."${username}" = {
+      extraGroups = [
+        "libvirtd"
+        "networkmanager"
+        "wheel"
+      ];
+      # hashedPassword = "";
+      homeMode = "755";
+      ignoreShellProgramCheck = true;
+      isNormalUser = true;
+      shell = pkgs.nushell;
+    };
+  };
+}

hosts/example/env.nix

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+{
+  # Specific Use Cases
+  ## Hardware related
+  Bluetooth = false;
+  ### See https://github.com/blueman-project/blueman
+
+  GPU-AMD = false;
+  ### See https://nixos.wiki/wiki/AMD_GPU
+
+  GPU-Nvidia = false;
+  ### See https://nixos.wiki/wiki/Nvidia
+
+  GPU-Intel = false;
+  ### See https://nixos.wiki/wiki/Intel_Graphics
+
+  HotSpot-Use-Case = false;
+  ### See https://nixos.wiki/wiki/Internet_Connection_Sharing
+
+  ZFS-Networking-HostID = "";
+  ### See https://search.nixos.org/options?channel=unstable&show=networking.hostId&from=0&size=30&sort=relevance&query=networking.hostId
+  ### Could be generated by `head -c4 /dev/urandom | od -A none -t x4`
+
+  ZFS-Use-Case = false;
+  ### See https://openzfs.github.io/openzfs-docs/Getting%20Started/NixOS/index.html
+
+  ## Software related
+  QEMU-VM-Use-Case = false;
+  ### See https://github.com/qemu/qemu ; https://github.com/virt-manager/virt-manager
+
+  Transparent-Proxy = false;
+  ### See https://github.com/daeuniverse/daed
+
+  # Options
+  ## System related
+  BootLoader = "systemd-boot";
+  ### Possible options: grub ; grub-mirror ; systemd-boot # See https://nixos.wiki/wiki/Bootloader https://search.nixos.org/options?channel=unstable&from=0&size=50&sort=relevance&type=packages&query=mirroredBoots
+
+  KernelPackages = "linuxPackages_cachyos";
+  ### See https://search.nixos.org/options?show=boot.kernelPackages https://www.nyx.chaotic.cx/#using-sched-ext-schedulers
+
+  KeyboardLayout = "us";
+  ### See https://en.wikipedia.org/wiki/Keyboard_layout
+
+  Locale = "en_US.UTF-8";
+  ### See https://docs.moodle.org/405/en/Table_of_locales
+
+  StateVersion = "25.05";
+  ### See https://mynixos.com/nixpkgs/option/system.stateVersion
+
+  TimeZone = "Asia/Singapore";
+  ### See https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+
+  ## Wayland related
+  MonitorSettings = "monitor = , preferred, auto, auto";
+  ### MonitorSettings For Hyprland See https://wiki.hyprland.org/Configuring/Monitors/
+
+  OutputSettings = "output * scale 1";
+  ### OutputSettings For sway See https://github.com/swaywm/sway/wiki#display-configuration
+
+  ScaleLevel = "1";
+  ### For Hyprland see https://wiki.hyprland.org/Configuring/XWayland/#hidpi-xwayland
+  ### For sway see https://github.com/swaywm/sway/wiki#hidpi
+
+  WM = "Hyprland";
+  ### Possible options: Hyprland ; niri ; sway
+}

hosts/example/hardware.nix

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+{
+  config,
+  lib,
+  modulesPath,
+  ...
+}: {
+  imports = [
+    (modulesPath + "/installer/scan/not-detected.nix")
+  ];
+
+  boot.initrd.availableKernelModules = ["xhci_pci" "ehci_pci" "ahci" "nvme" "usbhid" "sd_mod"];
+  boot.initrd.kernelModules = [];
+  #  boot.kernelModules = [ "kvm-amd" ];# For AMD CPU
+  boot.kernelModules = ["kvm-intel"];
+  boot.extraModulePackages = [];
+
+  fileSystems."/" = {
+    device = "/dev/disk/by-uuid/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = {
+    device = "/dev/disk/by-uuid/xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
+    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;
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  #  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware; # For AMD CPU
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware; # For Intel CPU
+}