nixos treewide: don't set MODULE_DIR

nixos/modules/hardware/video/bumblebee.nix

···
       serviceConfig = {
         ExecStart = "${bumblebee}/bin/bumblebeed --use-syslog -g ${cfg.group} --driver ${cfg.driver}";
       };
-      environment.MODULE_DIR="/run/current-system/kernel-modules/lib/modules/";
     };
   };
 }

nixos/modules/hardware/video/webcam/facetimehd.nix

···
 
     # and load it back on resume
     powerManagement.resumeCommands = ''
-      export MODULE_DIR=/run/current-system/kernel-modules/lib/modules
       ${pkgs.kmod}/bin/modprobe -v facetimehd
     '';
 

nixos/modules/services/hardware/tlp.nix

···
           ExecStart = "${tlp}/bin/tlp init start";
           ExecStop = "${tlp}/bin/tlp init stop";
         };
-
-        environment.MODULE_DIR="/run/current-system/kernel-modules/lib/modules/";
       };
 
       tlp-sleep = {
···
           ExecStart = "${tlp}/bin/tlp suspend";
           ExecStop = "${tlp}/bin/tlp resume";
         };
-
-        environment.MODULE_DIR="/run/current-system/kernel-modules/lib/modules/";
       };
     };
 

nixos/modules/services/hardware/udev.nix

···
       '';
 
     systemd.services.systemd-udevd =
-      { environment.MODULE_DIR = "/run/booted-system/kernel-modules/lib/modules";
-        restartTriggers = cfg.packages;
+      { restartTriggers = cfg.packages;
       };
 
   };

nixos/modules/system/boot/kernel.nix

···
     systemd.services."systemd-modules-load" =
       { wantedBy = [ "multi-user.target" ];
         restartTriggers = [ kernelModulesConf ];
-        environment.MODULE_DIR = "/run/booted-system/kernel-modules/lib/modules";
         serviceConfig =
           { # Ignore failed module loads.  Typically some of the
             # modules in ‘boot.kernelModules’ are "nice to have but
···
             # barf on those.
             SuccessExitStatus = "0 1";
           };
-      };
-
-    systemd.services.kmod-static-nodes =
-      { environment.MODULE_DIR = "/run/booted-system/kernel-modules/lib/modules";
       };
 
     lib.kernelConfig = {

nixos/modules/system/boot/modprobe.nix

···
         echo ${pkgs.kmod}/bin/modprobe > /proc/sys/kernel/modprobe
       '';
 
-    environment.sessionVariables.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
-
   };
 
 }

nixos/modules/system/boot/stage-2-init.sh

···
 # Start systemd.
 echo "starting systemd..."
 PATH=/run/current-system/systemd/lib/systemd \
-    MODULE_DIR=/run/booted-system/kernel-modules/lib/modules \
     LOCALE_ARCHIVE=/run/current-system/sw/lib/locale/locale-archive \
     exec systemd

nixos/modules/virtualisation/docker.nix

···
         } // proxy_env;
 
         path = [ pkgs.kmod ] ++ (optional (cfg.storageDriver == "zfs") pkgs.zfs);
-        environment.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules";
 
         postStart = if cfg.socketActivation then "" else cfg.postStart;