Revert "Simple proof of concept for how to do other types of services"

This reverts commit 7c3253e519.

I included this in another push by accident and never intended for it to
be in mainline. See https://github.com/NixOS/nixpkgs/pull/26075 if you
want more.

nixos/modules/module-list.nix

@@ -131,8 +131,6 @@
   ./security/rtkit.nix
   ./security/wrappers/default.nix
   ./security/sudo.nix
-  ./service-managers/docker.nix
-  ./service-managers/trivial.nix
   ./services/admin/salt/master.nix
   ./services/admin/salt/minion.nix
   ./services/amqp/activemq/default.nix

nixos/modules/service-managers/docker.nix

@@ -1,29 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-let
-  cfg = config.docker-containers;
-
-  containerModule = {
-    options.script = mkOption {
-      type = types.lines;
-      description = "Shell commands executed as the service's main process.";
-    };
-  };
-
-  toContainer = name: value: pkgs.dockerTools.buildImage {
-    inherit name;
-    config = {
-      Cmd = [ value.script ];
-    };
-  };
-in {
-  options.docker-containers = mkOption {
-    default = {};
-    type = with types; attrsOf (types.submodule containerModule);
-    description = "Definition of docker containers";
-  };
-
-  config.system.build.toplevel-docker = lib.mapAttrs toContainer cfg;
-}

nixos/modules/service-managers/trivial.nix

@@ -1,35 +0,0 @@
-{ config, lib, pkgs, ... }:
-
-with lib;
-
-let
-  cfg = config.trivial-services;
-
-  serviceModule.options = {
-    script = mkOption {
-      type = types.lines;
-      description = "Shell commands executed as the service's main process.";
-    };
-
-    environment = mkOption {
-      default = {};
-      type = types.attrs; # FIXME
-      example = { PATH = "/foo/bar/bin"; LANG = "nl_NL.UTF-8"; };
-      description = "Environment variables passed to the service's processes.";
-    };
-  };
-
-  launcher = name: value: pkgs.writeScript name ''
-    #!${pkgs.stdenv.shell} -eu
-
-    ${pkgs.writeScript "${name}-entry" value.script}
-  '';
-in {
-  options.trivial-services = mkOption {
-    default = {};
-    type = with types; attrsOf (types.submodule serviceModule);
-    description = "Definition of trivial services";
-  };
-
-  config.system.build.toplevel-trivial = lib.mapAttrs launcher cfg;
-}

nixos/modules/services/security/hologram-server.nix

@@ -23,8 +23,6 @@ let
     stats  = cfg.statsAddress;
     listen = cfg.listenAddress;
   });
-
-  script = "${pkgs.hologram.bin}/bin/hologram-server --debug --conf ${cfgFile}";
 in {
   options = {
     services.hologram-server = {
@@ -96,15 +94,9 @@ in {
       after       = [ "network.target" ];
       wantedBy    = [ "multi-user.target" ];
 
-      inherit script;
-    };
-
-    docker-containers.hologram-server = {
-      inherit script;
-    };
-
-    trivial-services.hologram-server = {
-      inherit script;
+      serviceConfig = {
+        ExecStart = "${pkgs.hologram.bin}/bin/hologram-server --debug --conf ${cfgFile}";
+      };
     };
   };
 }