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