{ config, pkgs, ... }: with pkgs.lib; { ###### interface options = { system.sbin.modprobe = mkOption { internal = true; default = pkgs.writeTextFile { name = "modprobe"; destination = "/sbin/modprobe"; executable = true; text = '' #! ${pkgs.stdenv.shell} export MODULE_DIR=/run/current-system/kernel-modules/lib/modules # Fall back to the kernel modules used at boot time if the # modules in the current configuration don't match the # running kernel. if [ ! -d "$MODULE_DIR/$(${pkgs.coreutils}/bin/uname -r)" ]; then MODULE_DIR=/run/booted-system/kernel-modules/lib/modules/ fi exec ${pkgs.kmod}/sbin/modprobe "$@" ''; }; description = '' Wrapper around modprobe that sets the path to the modules tree. ''; }; boot.blacklistedKernelModules = mkOption { default = []; example = [ "cirrusfb" "i2c_piix4" ]; description = '' List of names of kernel modules that should not be loaded automatically by the hardware probing code. ''; }; boot.extraModprobeConfig = mkOption { default = ""; example = '' options parport_pc io=0x378 irq=7 dma=1 ''; description = '' Any additional configuration to be appended to the generated modprobe.conf. This is typically used to specify module options. See modprobe.conf 5 for details. ''; type = types.lines; }; }; ###### implementation config = { environment.etc = singleton { source = pkgs.writeText "modprobe.conf" '' ${flip concatMapStrings config.boot.blacklistedKernelModules (name: '' blacklist ${name} '')} ${config.boot.extraModprobeConfig} ''; target = "modprobe.d/nixos.conf"; }; environment.systemPackages = [ config.system.sbin.modprobe pkgs.kmod ]; boot.blacklistedKernelModules = [ # This module is for debugging and generates gigantic amounts # of log output, so it should never be loaded automatically. "evbug" # This module causes ALSA to occassionally select the wrong # default sound device, and is little more than an annoyance # on modern machines. "snd_pcsp" # The cirrusfb module prevents X11 from starting. FIXME: # Ubuntu blacklists all framebuffer devices because they're # "buggy" and cause suspend problems. Maybe we should too? "cirrusfb" ]; system.activationScripts.modprobe = '' # Allow the kernel to find our wrapped modprobe (which searches # in the right location in the Nix store for kernel modules). # We need this when the kernel (or some module) auto-loads a # module. echo ${config.system.sbin.modprobe}/sbin/modprobe > /proc/sys/kernel/modprobe ''; environment.variables.MODULE_DIR = "/run/current-system/kernel-modules/lib/modules"; }; }