accountservice: add dbus and systemd services

Enable by default with gnome3.

nixos/modules/module-list.nix

@@ -96,6 +96,7 @@
   ./services/databases/postgresql.nix
   ./services/databases/virtuoso.nix
   ./services/databases/monetdb.nix
+  ./services/desktops/accountservice.nix
   ./services/games/ghost-one.nix
   ./services/games/minecraft-server.nix
   ./services/hardware/acpid.nix

nixos/modules/services/desktops/accountservice.nix

@@ -0,0 +1,40 @@
+# AccountsService daemon.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.accounts-daemon = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable AccountsService, a DBus service for accessing
+          the list of user accounts and information attached to those accounts.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.accounts-daemon.enable {
+
+    environment.systemPackages = [ pkgs.accountservice ];
+
+    services.dbus.packages = [ pkgs.accountservice ];
+
+    systemd.packages = [ pkgs.accountservice ];
+  };
+
+}

nixos/modules/services/x11/desktop-managers/gnome3.nix

@@ -22,6 +22,7 @@ in {
     # Enable helpful DBus services.
     security.polkit.enable = true;
     services.udisks2.enable = true;
+    services.accounts-daemon.enable = true;
     networking.networkmanager.enable = true;
     services.upower.enable = config.powerManagement.enable;
 

pkgs/development/libraries/accountservice/default.nix

@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, pkgconfig, glib, intltool, libtool, gobjectIntrospection, polkit }:
+{ stdenv, fetchurl, pkgconfig, glib, intltool
+, libtool, gobjectIntrospection, polkit, systemd }:
 
 stdenv.mkDerivation rec {
   name = "accountsservice-0.6.35";
@@ -8,6 +9,8 @@ stdenv.mkDerivation rec {
     sha256 = "0f1hzl6hw56xvwgmd4yvmdyj15xj1fafw45pzv3qarww7h0wg8b5";
   };
 
-  buildInputs = [ pkgconfig glib intltool libtool gobjectIntrospection polkit ];
+  buildInputs = [ pkgconfig glib intltool libtool
+                  gobjectIntrospection polkit systemd ];
 
+  configureFlags = [ "--with-systemdsystemunitdir=$(out)/etc/systemd/system" ];
 }