{ config, lib, pkgs, ... }: with lib; let cfg = config.services.babeld; paramsString = params: concatMapStringsSep "" (name: "${name} ${boolToString (getAttr name params)}") (attrNames params); interfaceConfig = name: let interface = getAttr name cfg.interfaces; in "interface ${name} ${paramsString interface}\n"; configFile = with cfg; pkgs.writeText "babeld.conf" ( (optionalString (cfg.interfaceDefaults != null) '' default ${paramsString cfg.interfaceDefaults} '') + (concatMapStrings interfaceConfig (attrNames cfg.interfaces)) + extraConfig); in { ###### interface options = { services.babeld = { enable = mkOption { default = false; description = '' Whether to run the babeld network routing daemon. ''; }; interfaceDefaults = mkOption { default = null; description = '' A set describing default parameters for babeld interfaces. See babeld8 for options. ''; type = types.nullOr (types.attrsOf types.unspecified); example = { wired = true; "split-horizon" = true; }; }; interfaces = mkOption { default = {}; description = '' A set describing babeld interfaces. See babeld8 for options. ''; type = types.attrsOf (types.attrsOf types.unspecified); example = { enp0s2 = { wired = true; "hello-interval" = 5; "split-horizon" = "auto"; }; }; }; extraConfig = mkOption { default = ""; description = '' Options that will be copied to babeld.conf. See babeld8 for details. ''; }; }; }; ###### implementation config = mkIf config.services.babeld.enable { systemd.services.babeld = { description = "Babel routing daemon"; after = [ "network.target" ]; wantedBy = [ "multi-user.target" ]; serviceConfig.ExecStart = "${pkgs.babeld}/bin/babeld -c ${configFile}"; }; }; }