modules/persistence.nix


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{ config, inputs, lib, ... }:


with lib;
let
  cfg = config.modules.persistence;
in
{
  imports = [
    inputs.impermanence.nixosModules.impermanence
  ];

  options.modules.persistence = {
    enable = mkEnableOption "impermanence persistence";

    storagePath = lib.mkOption {
      type = types.path;
      description = ''
        The path to persistent storage where the real
        files and directories should be stored.
      '';
    };

    directories = mkOption {
      type = types.listOf types.str;
      default = [ ];
    };
  };

  config = mkIf cfg.enable {
    fileSystems.${cfg.storagePath}.neededForBoot = true;

    environment.persistence.${cfg.storagePath}.directories = cfg.directories;

    services.openssh.hostKeys = [
      {
        path = "${cfg.storagePath}/ssh/ssh_host_ed25519_key";
        type = "ed25519";
      }
      {
        path = "${cfg.storagePath}/ssh/ssh_host_rsa_key";
        type = "rsa";
        bits = 4096;
      }
    ];
  };
}