nix-config/hosts/skycam/default.nix

{ config, pkgs, ... }:

{
  imports = [
    ./hardware-configuration.nix
    ../server.nix
  ];

  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
      wireless-regdb
    ];
  };

  services.udev.extraRules = ''
    SUBSYSTEM="dma_heap", GROUP="video", MODE="0600"
  '';

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

  systemd.services.ustreamer = {
    enable = true;
    description = "uStreamer service";
    unitConfig = {
      Type = "simple";
    };
    serviceConfig = {
      ExecStartPre = ''${pkgs.v4l-utils}/bin/v4l2-ctl \
        --device=/dev/video0 \
        --fix-edid-checksums \
        --info-edid
      '';
      ExecStart = ''${pkgs.unstable.ustreamer}/bin/ustreamer \
        --device=/dev/video0 \
        --resolution=1280x720 \
        --format=uyvy \
        --encoder=m2m-image \
        --workers=3 \
        --persistent \
        --dv-timings \
        --drop-same-frames=30 \
        --host=0.0.0.0 \
        --port=8080
      '';
    };
    wantedBy = [ "network-online.target" ];
    confinement.mode = "chroot-only";
  };

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

  system.stateVersion = "24.05";
}