nix/module.nix


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

with utils;
with lib;

let
  dirConfig = {
    options = {
      path = mkOption {
        type = types.path;
      };

      maxSize = mkOption {
        type = with types; either ints.positive str;
      };

      minSleep = mkOption {
        type = with types; nullOr ints.positive;
        default = 3600; 
      };

      monitorTimeout = mkOption {
        type = with types; nullOr ints.positive;
        default = 3600 * 24;
      };
    };
  };

  dirService = dCfg: nameValuePair ("rolling-directory@" + escapeSystemdPath dCfg.path) {
    wantedBy = [ "multi-user.target" ];

    path = with pkgs; [ rolling-directory ];

    script = let
      args = [ dCfg.path dCfg.maxSize "monitor" ]
          ++ optionals (dCfg.monitorTimeout != null) ["-t" dCfg.monitorTimeout]
          ++ optionals (dCfg.minSleep != null) ["-s" dCfg.minSleep];
    in ''
      exec -- rolling-directory ${escapeShellArgs args}
    '';
  };
in {
  options = {
    services.rollingDirectories = mkOption {
      type = with types; listOf (submodule dirConfig);
      default = [];
    };
  };

  config = {
    nixpkgs.config.packageOverrides = import ./default.nix;

    systemd.services = listToAttrs (map dirService config.services.rollingDirectories);
  };
}