khushboo.nix

{
  inputs = {
    nixos-hardware.url = github:IvanMalison/nixos-hardware;
    nixpkgs = {
      url = github:NixOS/nixpkgs/nixos-unstable;
    };
  };
  outputs = { self, nixpkgs, nixos-hardware }:
  let configuration = { config, pkgs, ... }:
  {
    imports = [
      nixos-hardware.nixosModules.raspberry-pi-4
    ];

    nixpkgs.config.allowUnfree = true;
    programs.gnupg.agent = { enable = true; enableSSHSupport = true; };
    networking.firewall.enable = false;
    networking.networkmanager.enable = true;

    sound.enable = true;
    hardware.pulseaudio.enable = true;

    # Keyboard/Keymap
    console.keyMap = "us";

    i18n = {
      defaultLocale = "en_US.UTF-8";
    };

    # Update timezone automatically
    services.tzupdate.enable = true;

    nix = {
      extraOptions = ''
        experimental-features = nix-command flakes ca-references
      '';
    };
    hardware.raspberry-pi."4".fkms-3d.enable = true;
    hardware.raspberry-pi."4".audio.enable = true;

    boot = {
      kernelPackages = pkgs.linuxPackages_rpi4;
      tmpOnTmpfs = true;
      loader = {
        grub.enable = false;
        generic-extlinux-compatible.enable = true;
        raspberryPi = {
          enable = true;
	        version = 4;
	        firmwareConfig = ''
            dtparam=audio=on
            hdmi_drive=2
	        '';
        };
      };
    };

    services.xserver = {
      exportConfiguration = true;
      enable = true;
      layout = "us";
      desktopManager.gnome.enable = true;
      displayManager.gdm.enable = true;
    };

    hardware.enableRedistributableFirmware = true;

    networking.useDHCP = false;
    networking.interfaces.eth0.useDHCP = true;
    networking.interfaces.wlan0.useDHCP = true;

    powerManagement.cpuFreqGovernor = "ondemand";

    fileSystems."/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
      options = [ "noatime" ];
    };

    users.extraUsers = {
      khushboo = {
        name = "khushboo";
        group = "users";
        isNormalUser = true;
        createHome = true;
        extraGroups = [
          "audio"
          "disk"
          "networkmanager"
          "plugdev"
          "systemd-journal"
          "video"
          "wheel"
        ];
      };
    };

    environment.systemPackages = with pkgs; [
      raspberrypi-eeprom

      vim

      firefox
      dolphin

      binutils
      gawk
      gitFull
      htop
      ncdu
      lsof
      ripgrep
      tmux
      usbutils
      wget

      ic-keysmith
      quill
      quill-qr
    ];
  };
  in {
    nixosConfigurations = {
      air-gapped-pi = nixpkgs.lib.nixosSystem {
        system = "aarch64-linux";
        modules = [ configuration ];
      };
    };
  };
}