dotfiles/nixos/systems/liveusb/default.nix

# SPDX-FileCopyrightText: 2022 Richard Brežák <richard@brezak.sk>
#
# SPDX-License-Identifier: LGPL-3.0-or-later
{ inputs, lib', config, ... }:
let
  inherit (lib')
    flip
    mapAttrs
    singleton;

  config' = config;
in
{
  flake.nixosConfigurations.liveusb = inputs.nixpkgs.lib.nixosSystem {
    system = "x86_64-linux";
    lib = lib';

    specialArgs = {
      config' = config';
      inputs' = inputs;
      secret = lib'.loadSecrets inputs.secrets;
    };

    modules = singleton
      ({ pkgs, config, ... }:
        {
          imports = [
            "${inputs.nixpkgs}/nixos/modules/installer/cd-dvd/installation-cd-graphical-base.nix"
            ../../common/nixpkgs.nix
          ];

          environment.systemPackages = [
            (pkgs.writeShellScriptBin "test-s0ix" ''
              _cpu_residency="/sys/devices/system/cpu/cpuidle/low_power_idle_cpu_residency_us"
              _system_residency="/sys/devices/system/cpu/cpuidle/low_power_idle_system_residency_us"

              echo '> '"$_system_residency before"
              _residency_before=$(cat "$_system_residency")
              echo "$_residency_before"

              echo "Suspending to RAM and resuming in 30 seconds..."
              rtcwake -u -s 30 -m mem -n && systemctl suspend

              echo '> '"$_system_residency after"
              _residency_after=$(cat "$_system_residency")
              echo "$_residency_after"

              if [ $_residency_before -lt $_residency_after ] ; then
                echo "Suspend successful"
              elso
                echo "Suspend unsuccessful"
              fi

              ${lib'.getExe pkgs.smartmontools} -a $(echo /dev/nvme?n? | tr ' ' '\n' | head -n 1)
            '')
          ];

          isoImage.edition = "xfce";

          services.xserver.videoDrivers = [ "nvidia" ];

          boot.supportedFilesystems = singleton "zfs";

          boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_1;
          boot.kernelParams = [
            "nvidia.NVreg_EnableS0ixPowerManagement=1"
            "nvidia.NVreg_S0ixPowerManagementVideoMemoryThreshold=2048"
          ];

          hardware.nvidia = {
            powerManagement.enable = true;
            package = config.boot.kernelPackages.nvidia_x11_beta;
          };

          services.xserver = {
            desktopManager = {
              xterm.enable = false;
              xfce.enable = true;
            };
            displayManager.defaultSession = "xfce";
          };
        });
      };
}