* Use the aggregator to combine the kernel modules tree with

externally-built modules so that (e.g.) "modprobe nvidia" Just
  Works.

svn path=/nixos/trunk/; revision=10129

etc/default.nix

@@ -1,6 +1,5 @@
 { config, pkgs, upstartJobs, systemPath, wrapperDir
-, defaultShell, extraEtc, nixEnvVars
+, defaultShell, extraEtc, nixEnvVars, modulesTree
-, kernel ? null
 }:
 
 let 
@@ -108,13 +107,11 @@ import ../helpers/make-etc.nix {
     { # Script executed when the shell starts.
       source = pkgs.substituteAll {
         src = ./profile.sh;
-        inherit systemPath wrapperDir;
+        inherit systemPath wrapperDir modulesTree;
         inherit (pkgs) glibc;
         timeZone = config.time.timeZone;
         defaultLocale = config.i18n.defaultLocale;
         inherit nixEnvVars;
-	systemKernel = (if kernel == null then 
-		pkgs.systemKernel else kernel);
       };
       target = "profile";
     }

etc/profile.sh

@@ -1,5 +1,5 @@
 export PATH=@wrapperDir@:/var/run/current-system/sw/bin:/var/run/current-system/sw/sbin
-export MODULE_DIR=@systemKernel@/lib/modules
+export MODULE_DIR=@modulesTree@/lib/modules
 export NIXPKGS_CONFIG=/nix/etc/config.nix
 export PAGER=less
 export TZ=@timeZone@

system/modprobe

@@ -1,3 +1,3 @@
 #! @shell@
-export MODULE_DIR=@kernel@/lib/modules
+export MODULE_DIR=@modulesTree@/lib/modules
 exec @module_init_tools@/sbin/modprobe "$@"

system/system.nix

@@ -142,13 +142,24 @@ rec {
     (map (mod: mod + "/lib") nssModules));
 
 
+  # Tree of kernel modules.  This includes the kernel, plus modules
+  # built outside of the kernel.  We have to combine these into a
+  # single tree of symlinks because modprobe only supports one
+  # directory.
+  modulesTree = pkgs.module_aggregation (
+    [kernel pkgs.iwlwifi]
+    # !!! this should be declared by the xserver Upstart job.
+    ++ pkgs.lib.optional (config.services.xserver.enable && config.services.xserver.videoDriver == "nvidia") pkgs.nvidiaDrivers
+  );
+
+  
   # Wrapper around modprobe to set the path to the modules.
   modprobe = pkgs.substituteAll {
     dir = "sbin";
     src = ./modprobe;
     isExecutable = true;
     inherit (pkgs) module_init_tools;
-    inherit kernel;
+    inherit modulesTree;
   };
 
 
@@ -171,8 +182,7 @@ rec {
   # The static parts of /etc.
   etc = import ../etc/default.nix {
     inherit config pkgs upstartJobs systemPath wrapperDir
-      defaultShell nixEnvVars;
+      defaultShell nixEnvVars modulesTree;
-    inherit kernel;
     extraEtc = pkgs.lib.concatLists (map (job: job.extraEtc) upstartJobs.jobs);
   };
 

upstart-jobs/xserver.nix

@@ -363,8 +363,6 @@ rec {
       ${if videoDriver == "nvidia"        
         then ''
           ln -sf ${pkgs.nvidiaDrivers} /var/run/opengl-driver
-          # Ideally, the nvidia driver would be somewhere where modprobe looks for it...
-          ${pkgs.module_init_tools}/sbin/insmod ${pkgs.nvidiaDrivers}/lib/nvidia.ko || true
         ''
 	else if cfg.driSupport
         then "ln -sf ${pkgs.mesa} /var/run/opengl-driver"