biscuit/configuration.nix

{ lib, config, pkgs, ... }:

let
  saturn = pkgs.callPackage ./pkgs/saturn {};

  drm-framebuffer =  pkgs.stdenv.mkDerivation {
    name = "drm-framebuffer";
    src = pkgs.fetchFromGitHub {
      owner = "embear-engineering";
      repo = "drm-framebuffer";
      rev = "80e862bd13bc0f96848af1c1b24b4b0e1fe5b23c";
      hash = "sha256-YBRG8FUbhwAgquzehvo5Mu+xODcWOOG1HTMtUhNq6xo=";
    };
    nativeBuildInputs = [ pkgs.pkg-config ];
    buildInputs = with pkgs; [ libdrm ];
    preBuild = ''
      makeFlagsArray+=("CFLAGS=$($PKG_CONFIG --libs --cflags libdrm)")
    '';
    makeFlags = [ "DESTDIR=${placeholder "out"}" "bindir=/bin" ];
  };

  modemFirmware = config.mobile.device.firmware.override {
    modem = ./local/harpia-modem;
  };
  secrets = import ./local/secrets.nix;
in {
  imports = [
    (import ../mobile-nixos/lib/configuration.nix { device = "motorola-harpia"; })
  ];

  config = {
    nixpkgs.overlays = [
      (final: prev: {
        wlr-randr = prev.wlr-randr.overrideAttrs(o: {
          depsBuildBuild = [ final.pkgsBuildBuild.pkg-config ];
        });
        maps = final.callPackage ./pkgs/maps {};
        qmi-nmea = final.callPackage ./pkgs/qmi-nmea {};
      })
    ];

    mobile = {
      adbd.enable = true;
      boot.stage-1.firmware = [
        modemFirmware
        pkgs.wireless-regdb
      ];
    };
    hardware.firmware = [
      modemFirmware
      pkgs.wireless-regdb
    ];
    system.stateVersion = "23.11";

    boot.kernelParams = [
      # "dyndbg=\"file drivers/base/firmware_loader/main.c +fmp\""
      # "dyndbg=\"file drivers/gpu/drm/panel/msm8953-generated/panel-boe-bs052fhm-a00-6c01.c  +fmp\""
      # "dyndbg=\"file drivers/video/backlight/qcom-wled.c +fmp\""
    ];

    fileSystems."/boot" = {
      device = "/dev/disk/by-label/nixos-boot";
      fsType = "ext2";
    };

    # according to fdisk, /dev/mmcblk0p41 is 30469887-7471104=22998783
    # blocks, and if we let it get resized by whatever magic this is
    # (I'm assuming systemd-growfs), on the subsequent boot we'll get
    # an error

    # EXT4-fs (mmcblk0p41): bad geometry: block count 2883067 exceeds size of device (2874848 blocks)

    # in which neither number matches the reported size (they're both
    # about 10% of it). cool.

    boot.growPartition = lib.mkForce false;

    services.udev.extraRules = ''
      # unlock the gps engine
      SUBSYSTEM=="wwan", ENV{DEVNAME}=="/dev/wwan0qmi0", ENV{DEVTYPE}=="wwan_port", \
        RUN+="${pkgs.libqmi}/bin/qmicli -pd $env{DEVNAME} --loc-set-engine-lock=none"
    '';

    networking = {
      interfaces.wlan0.useDHCP = true;
      hostName = "biscuit";
      networkmanager = {
        enable = true;
        unmanaged = ["wlan0"];
      };
      useNetworkd = true;
      # requires nixpkgs 0deadd5baf (Dec 2024)
      modemmanager.enable = true;
      inherit (secrets) wireless;
    };

    services.openssh.enable = true;

    services.cage =
      let wlinit = pkgs.writeScript "wlinit" ''
        ${pkgs.wlr-randr}/bin/wlr-randr --output DSI-1 --scale 2
        exec ${saturn}/bin/saturn
      '';
      in {
        enable = true;
        program = wlinit;
        user = "dan";
      };

    environment.systemPackages = with pkgs; [
      drm-framebuffer
      satellite
      wlr-randr
      maps
      qmi-nmea
    ];

    users.users.dan = {
      isNormalUser = true;
      uid = 1000;
      extraGroups = [ "wheel" "libvirtd" "docker" "dialout" ];
      openssh.authorizedKeys.keys = import ../telent-nixos-config/users/dan/authorized-keys.nix;
    };

    users.users.root.openssh.authorizedKeys.keys = import ../telent-nixos-config/users/dan/authorized-keys.nix;

    hardware.opengl = {
      enable = true; driSupport = true;
    };

    systemd.services = {
      nmea-share = {
        wantedBy = [ "multi-user.target" ];
        serviceConfig = {
          # https://github.com/andersson/rmtfs/blob/7a5ae7e0a57be3e09e0256b51b9075ee6b860322/rmtfs.c#L507-L541
          ExecStart = ''
            ${pkgs.socat}/bin/socat   exec:"${pkgs.qmi-nmea}/bin/qmi-nmea /dev/wwan0qmi0",pty   unix-listen:/var/run/gnss-share.sock,fork,umask=0000,mode=0766
          '';
          Restart = "always";
          RestartSec = "2";
        };
      };
      rmtfs =
        # the four files in here are partition images:
        #  partlabel => filename
        #  modemst1  => modem_fs1
        #  modemst2  => modem_fs2
        #  fsc       => modem_fsc
        #  fsg       => modem_fsg

        let files = pkgs.runCommand "rmtfs" {} ''
          mkdir -p $out/lib/firmware
          cp ${./local/uncompressed-firmware/rmtfs}/* $out/lib/firmware
        '';
        in {
          wantedBy = [ "multi-user.target" ];
          serviceConfig = {
            # https://github.com/andersson/rmtfs/blob/7a5ae7e0a57be3e09e0256b51b9075ee6b860322/rmtfs.c#L507-L541
            ExecStart = "${pkgs.rmtfs}/bin/rmtfs -s -r -o ${files}/lib/firmware";
            Restart = "always";
            RestartSec = "10";
          };
        };
    };

  };
}