nix-config/hosts/skycam/default.nix

{
  inputs,
  config,
  pkgs,
  ...
}:

{
  imports = [
    inputs.nixos-hardware.nixosModules.raspberry-pi-4
    ./hardware-configuration.nix
    ../server.nix
  ];

  nixpkgs.hostPlatform = "aarch64-linux";

  hardware = {
    raspberry-pi."4" = {
      apply-overlays-dtmerge.enable = true;
      audio.enable = false;
      xhci.enable = false;
    };
    deviceTree = {
      enable = true;
      filter = "*rpi-4-*.dtb";
      # From https://github.com/Electrostasy/dots/blob/3b81723feece67610a252ce754912f6769f0cd34/hosts/phobos/klipper.nix#L43-L65
      overlays =
        let
          mkCompatibleDtsFile =
            dtbo:
            let
              drv =
                pkgs.runCommand "fix-dts"
                  {
                    nativeBuildInputs = with pkgs; [
                      dtc
                      gnused
                    ];
                  }
                  ''
                    mkdir "$out"
                    dtc -I dtb -O dts ${dtbo} | sed -e 's/bcm2835/bcm2711/' > $out/overlay.dts
                  '';
            in
            "${drv}/overlay.dts";

          inherit (config.boot.kernelPackages) kernel;
        in
        [
          {
            name = "imx708.dtbo";
            dtsFile = mkCompatibleDtsFile "${kernel}/dtbs/overlays/imx708.dtbo";
          }
          {
            name = "vc4-kms-v3d-pi4.dtbo";
            dtsFile = mkCompatibleDtsFile "${kernel}/dtbs/overlays/vc4-kms-v3d-pi4.dtbo";
          }
        ];
    };
    firmware = with pkgs; [
      firmwareLinuxNonfree
    ];
  };

  services.udev.extraRules = ''
    SUBSYSTEM=="rpivid-*", GROUP="video", MODE="0660"
    KERNEL=="vcsm-cma", GROUP="video", MODE="0660"
    SUBSYSTEM=="dma_heap", GROUP="video", MODE="0660"
  '';

  nixpkgs.overlays = [
    (import ./../../overlays/libcamera.nix)
  ];

  networking = {
    hostId = "731d1660";
    firewall = {
      enable = true;
      allowedTCPPorts = [ 8080 ];
      allowedUDPPorts = [ 8080 ];
    };
  };

  systemd.services.ustreamer = {
    enable = true;
    description = "uStreamer service";
    unitConfig = {
      Type = "simple";
      ConditionPathExists = "/sys/bus/i2c/drivers/imx708/10-001a/video4linux";
    };
    serviceConfig = {
      ExecStart = ''
        ${pkgs.libcamera}/bin/libcamerify ${pkgs.unstable.ustreamer}/bin/ustreamer \
                --host=0.0.0.0 \
                --resolution=4608x2592
      '';
      DynamicUser = "yes";
      SupplementaryGroups = [ "video" ];
      Restart = "always";
      RestartSec = 10;
    };
    wantedBy = [ "network-online.target" ];
    confinement.mode = "chroot-only";
  };

  environment.systemPackages = with pkgs; [
    camera-streamer
    git
    neovim
    libcamera
    libraspberrypi
    raspberrypi-eeprom
    v4l-utils
    unstable.ustreamer
  ];

  system.stateVersion = "24.05";
}