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{ 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
<filename>modprobe.conf</filename>. This is typically used to
specify module options. See
<citerefentry><refentrytitle>modprobe.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> 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";
};
}
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