modules/by-name/im/impermanence/module.nix


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{
  config,
  lib,
  ...
}: let
  cfg = config.vhack.persist;
in {
  options.vhack.persist = {
    enable = lib.mkEnableOption "impermanence";

    directories = lib.mkOption {
      description = "The list of directories to persist";
      type = lib.types.listOf (lib.types.coercedTo lib.types.str (d: {directory = d;}) (lib.types.attrsOf lib.types.anything));
    };
  };

  config = lib.mkIf cfg.enable {
    environment.persistence."/srv" = {
      hideMounts = true;
      directories =
        [
          "/etc/nixos"
          "/var/log"

          # TODO(@bpeetz): Instead of persisting that, encode each uid/gid directly in the
          # config. <2024-12-24>
          "/var/lib/nixos"
        ]
        ++ cfg.directories;
      files = [
        "/etc/machine-id"
      ];
    };
  };
}