telepathy-mission-control: add dbus service, enabled by default on gnome3

nixos/modules/module-list.nix

@@ -99,6 +99,7 @@
   ./services/desktops/accountservice.nix
   ./services/desktops/gnome3/evolution-data-server.nix
   ./services/desktops/gnome3/sushi.nix
+  ./services/desktops/telepathy.nix
   ./services/games/ghost-one.nix
   ./services/games/minecraft-server.nix
   ./services/hardware/acpid.nix

nixos/modules/services/desktops/telepathy.nix

@@ -0,0 +1,39 @@
+# Telepathy daemon.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.telepathy = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable Telepathy service, a communications framework
+          that enables real-time communication via pluggable protocol backends.
+        '';
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.services.telepathy.enable {
+
+    environment.systemPackages = [ pkgs.telepathy_mission_control ];
+
+    services.dbus.packages = [ pkgs.telepathy_mission_control ];
+
+  };
+
+}

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

@@ -25,6 +25,7 @@ in {
     services.accounts-daemon.enable = true;
     services.gnome3.evolution-data-server.enable = true;
     services.gnome3.sushi.enable = true;
+    services.telepathy.enable = true;
     networking.networkmanager.enable = true;
     services.upower.enable = config.powerManagement.enable;
 

pkgs/applications/networking/instant-messengers/telepathy/mission-control/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, pkgconfig, telepathy_glib, libxslt }:
+{ stdenv, fetchurl, pkgconfig, telepathy_glib, libxslt, makeWrapper }:
 
 stdenv.mkDerivation rec {
   name = "${pname}-5.16.0";
@@ -9,7 +9,12 @@ stdenv.mkDerivation rec {
     sha256 = "1l61w6j04mbrjsbcfrlc0safh9nlsjnj0z6lszal64r9bhkcghzd";
   };
 
-  buildInputs = [ telepathy_glib ];
+  buildInputs = [ telepathy_glib makeWrapper ];
 
   nativeBuildInputs = [ pkgconfig libxslt ];
+
+  preFixup = ''
+    wrapProgram "$out/libexec/mission-control-5" \
+      --prefix XDG_DATA_DIRS : "$GSETTINGS_SCHEMAS_PATH"
+  '';
 }