os/modules/core/boot.nix

{ config, pkgs, lib, ... }:
with lib;
let
  cfg = config.pub-solar.core;
in
{
  options.pub-solar.core.iso-options.enable = mkOption {
    type = types.bool;
    default = false;
    description = "Feature flag for iso builds";
  };

  options.pub-solar.core.disk-encryption-active = mkOption {
    type = types.bool;
    default = true;
    description = "Whether it should be assumed that there is a cryptroot device";
  };

  options.pub-solar.core.hibernation = {
    enable = mkOption {
      type = types.bool;
      default = false;
      description = "Whether the device can hibernate. This creates a swapfile at /swapfile.";
    };

    resumeDevice = mkOption {
      type = types.str;
      default = "/swapfile";
      description = "The location of the hibernation resume swap file.";
    };

    resumeOffset = mkOption {
      type = types.nullOr types.number;
      default = null;
      description = "The swap file offset. Can be found by running `filefrag -v $swap_file_location`. See https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate#Hibernation_into_swap_file";
    };
  };

  config = {
    boot = {
      # Enable plymouth for better experience of booting
      plymouth.enable = true;

      # Mount / luks device in initrd
      # Allow fstrim to work on it.
      # The ! makes this enabled by default
      initrd = mkIf (!cfg.iso-options.enable && cfg.disk-encryption-active) {
        luks.devices."cryptroot" = {
          allowDiscards = true;
        };
      };


      resumeDevice = mkIf cfg.hibernation.enable cfg.hibernation.resumeDevice;
      kernelParams = mkIf cfg.hibernation.enable [
        "resume=${cfg.hibernation.resumeDevice}"
      ] ++ (
        if (cfg.hibernation.resumeOffset == null) then builtins.abort "config.pub-solar.hibernation.resumeOffset has to be set if config.pub-solar.hibernation.enable is true."
        else [ "resume_offset=${cfg.hibernation.resumeOffset}" ]
      );

      loader.systemd-boot.enable = true;

      # Use latest LTS linux kernel by default
      kernelPackages = pkgs.linuxPackages_5_15;

      # Support ntfs drives
      supportedFilesystems = [ "ntfs" ];
    };
  };
}