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nixpkgs/nixos/modules/system/boot/modprobe.nix
Eelco Dolstra 29027fd1e1 Rewrite ‘with pkgs.lib’ -> ‘with lib’
Using pkgs.lib on the spine of module evaluation is problematic
because the pkgs argument depends on the result of module
evaluation. To prevent an infinite recursion, pkgs and some of the
modules are evaluated twice, which is inefficient. Using ‘with lib’
prevents this problem.
2014-04-14 16:26:48 +02:00

102 lines
2.8 KiB
Nix

{ config, lib, pkgs, ... }:
with 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 {
type = types.listOf types.str;
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 = mkIf (!config.boot.isContainer) {
environment.etc = [
{ source = "${pkgs.kmod-blacklist-ubuntu}/modprobe.conf";
target = "modprobe.d/ubuntu.conf";
}
{ 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 ];
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";
};
}