nix/nixos/hosts/nixos-rpi4-02/default.nix

# 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.
{ inputs, config, lib, pkgs, modulesPath, ... }: {
  imports = [ 
    inputs.nixos-hardware.nixosModules.raspberry-pi-4
    (modulesPath + "/installer/scan/not-detected.nix")
  ];
  # Enable distributed Builds
  nix.distributedBuilds = true;

  hardware = {
    raspberry-pi."4".apply-overlays-dtmerge.enable = true;
    deviceTree = {
      enable = true;
      filter = "*rpi-4-*.dtb";
    };
  };
  console.enable = false;
  environment.systemPackages = with pkgs; [
    libraspberrypi
    raspberrypi-eeprom
  ];

  #####################################################################################
  # BEGIN hardware config
  #####################################################################################

  # Use the extlinux boot loader. (NixOS wants to enable GRUB by default)
  boot.loader.grub.enable = false;
  # Enables the generation of /boot/extlinux/extlinux.conf
  boot.loader.generic-extlinux-compatible.enable = true;

  boot.initrd.availableKernelModules = [ "xhci_pci" "usbhid" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ ];
  boot.extraModulePackages = [ ];

  fileSystems."/" = { 
    device = "/dev/disk/by-uuid/44444444-4444-4444-8888-888888888888";
    fsType = "ext4";
  };

  swapDevices = [ ];
  networking.useDHCP = lib.mkDefault true;
  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
  powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";
  networking.hostName = "nixos-rpi4-02";
  #####################################################################################
  # END hardware config
  #####################################################################################

  # Generic Tailscale configs are in /nixos/common/services/tailscale.nix  
  # Set up the secrets file:
  sops.secrets."tailscale_keys/nixos-rpi4-02" = {
    owner = "root";
    sopsFile = ../../../secrets/tailscale.yaml;
    restartUnits = [ 
      "tailscaled.service"
      "tailscaled-autoconnect.service" 
    ];
  };
  services.tailscale.authKeyFile = "/run/secrets/tailscale_keys/nixos-rpi4-02";
  services.tailscale.extraUpFlags = [ "--advertise-exit-node" ];
  boot.kernel.sysctl = { "net.ipv4.ip_forward" = true; };
  
  # Temporary
  # networking.firewall.allowedTCPPorts = [ 22 ];
}