nix: Make nix the root

Which means now I'll have to think about real prefixes in commit names.

unprocessed/config/scripts/cudarun

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+if [ -z $DISPLAY ]
+then
+    sudo tee /proc/acpi/bbswitch <<< ON
+    "$@"
+    rmmod nvidia_uvm
+    rmmod nvidia
+    sudo tee /proc/acpi/bbswitch <<< OFF
+else
+    PATH="/opt/cuda/bin:$PATH" LD_LIBRARY_PATH="/opt/cuda/lib64:$LD_LIBRARY_PATH" VBLANK=0 VGL_READBACK=pbo optirun -c yuv "$@"
+fi