Unverified Commit 6cb0b6a4 authored by Kevin Cox's avatar Kevin Cox
Browse files

nixos.minetest-server: Add option for generating config file and ability to... 

nixos.minetest-server: Add option for generating config file and ability to add extra command line flags

This adds two main features:

1. `services.minetest-server.config` is an options object that is automatically serialized into a minetest config file.
2. `services.minetest-server.extraArgs` provides an escape hatch to pass extra arguments.
parent a565059a

nixos/modules/services/games/minetest-server.nix

+63 −8
Original line number Diff line number Diff line
@@ -3,15 +3,52 @@ 
with lib;



let

  CONTAINS_NEWLINE_RE = ".*\n.*";

  # The following values are reserved as complete option values:

  # { - start of a group.

  # """ - start of a multi-line string.

  RESERVED_VALUE_RE = "[[:space:]]*(\"\"\"|\\{)[[:space:]]*";

  NEEDS_MULTILINE_RE = "${CONTAINS_NEWLINE_RE}|${RESERVED_VALUE_RE}";



  # There is no way to encode """ on its own line in a Minetest config.

  UNESCAPABLE_RE = ".*\n\"\"\"\n.*";



  toConfMultiline = name: value:

    assert lib.assertMsg

      ((builtins.match UNESCAPABLE_RE value) == null)

      ''""" can't be on its own line in a minetest config.'';

    "${name} = \"\"\"\n${value}\n\"\"\"\n";



  toConf = values:

    lib.concatStrings

      (lib.mapAttrsToList

        (name: value: {

          bool = "${name} = ${toString value}\n";

          int = "${name} = ${toString value}\n";

          null = "";

          set = "${name} = {\n${toConf value}}\n";

          string =

            if (builtins.match NEEDS_MULTILINE_RE value) != null

            then toConfMultiline name value

            else "${name} = ${value}\n";

        }.${builtins.typeOf value})

        values);



  cfg   = config.services.minetest-server;

  flag  = val: name: optionalString (val != null) "--${name} ${toString val} ";

  flag  = val: name: lib.optionals (val != null) ["--${name}" "${toString val}"];



  flags = [

    (flag cfg.gameId "gameid")

    (flag cfg.world "world")

    (flag cfg.configPath "config")

    (flag cfg.logPath "logfile")

    (flag cfg.port "port")

  ];

    "--server"

  ]

    ++ (

      if cfg.configPath != null

      then ["--config" cfg.configPath]

      else ["--config" (builtins.toFile "minetest.conf" (toConf cfg.config))])

    ++ (flag cfg.gameId "gameid")

    ++ (flag cfg.world "world")

    ++ (flag cfg.logPath "logfile")

    ++ (flag cfg.port "port")

    ++ cfg.extraArgs;

in

{

  options = {
@@ -55,6 +92,16 @@ in 
        '';

      };



      config = mkOption {

        type = types.attrsOf types.anything;

        default = {};

        description = lib.mdDoc ''

          Settings to add to the minetest config file.



          This option is ignored if `configPath` is set.

        '';

      };



      logPath = mkOption {

        type        = types.nullOr types.path;

        default     = null;
@@ -75,6 +122,14 @@ in 
          If set to null, the default 30000 will be used.

        '';

      };



      extraArgs = mkOption {

        type = types.listOf types.str;

        default = [];

        description = lib.mdDoc ''

          Additional command line flags to pass to the minetest executable.

        '';

      };

    };

  };
@@ -100,7 +155,7 @@ in 
      script = ''

        cd /var/lib/minetest



        exec ${pkgs.minetest}/bin/minetest --server ${concatStrings flags}

        exec ${pkgs.minetest}/bin/minetest ${lib.escapeShellArgs flags}

      '';

    };

  };