it-infra/nixops/rpi-server.nix

{ host, rpi4 }:

{ config, pkgs, ... }:
{
  deployment.targetHost = host;
  nix.nixPath = [ "nixpkgs=${pkgs.path}" ];
  nixpkgs.system = "aarch64-linux";

  boot.loader.grub.enable = false;

  boot.loader.generic-extlinux-compatible.enable = !rpi4;
  boot.loader.raspberryPi = pkgs.lib.mkIf rpi4 {
    enable = true;
    version = 4;
  };
  boot.kernelPackages = if rpi4 then pkgs.linuxPackages_rpi4 else pkgs.linuxPackages_rpi3;
  hardware.deviceTree.enable = true;
  hardware.deviceTree.base = pkgs.device-tree_rpi;
  hardware.deviceTree.overlays = [ "${pkgs.device-tree_rpi.overlays}/rpi-poe.dtbo" ];

  fileSystems = if rpi4 then {
    "/boot" = {
      device = "/dev/disk/by-label/FIRMWARE";
      fsType = "vfat";
    };
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
    };
  } else {
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
    };
  };

  services.openssh.enable = true;
  services.openssh.passwordAuthentication = false;
  services.openssh.extraConfig =
    ''
    StreamLocalBindUnlink yes
    '';
  programs.mosh.enable = true;

  networking.hostName = host;
  time.timeZone = "Asia/Hong_Kong";

  users.mutableUsers = false;
  users.defaultUserShell = pkgs.fish;
  users.extraUsers = import ./common-users.nix { inherit pkgs; };
  security.sudo.wheelNeedsPassword = false;

  documentation.enable = false;
  environment.systemPackages = with pkgs; [
    psmisc wget vim git sshfs usbutils lm_sensors file telnet mosh tmux
  ];
  programs.fish.enable = true;

  services.avahi.enable = true;
  services.avahi.publish.enable = true;
  services.avahi.publish.userServices = true;
  services.printing.enable = true;
  services.printing.drivers = [ pkgs.hplip ];
  services.printing.browsing = true;
  services.printing.listenAddresses = [ "*:631" ];
  services.printing.defaultShared = true;
  hardware.sane.enable = true;
  hardware.sane.extraBackends = [ pkgs.hplip ];
  networking.firewall.allowedTCPPorts = [ 631 ];

  nix.binaryCachePublicKeys = ["nixbld.m-labs.hk-1:5aSRVA5b320xbNvu30tqxVPXpld73bhtOeH6uAjRyHc="];
  nix.binaryCaches = ["https://cache.nixos.org" "https://nixbld.m-labs.hk"];
  nix.trustedUsers = ["root" "nix"];
}