# Credits: https://github.com/jordanisaacs/kernel-module-flake
# Original Copyright Notice:
# MIT License
# Copyright (c) 2022 Jordan Isaacs
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
{ stdenv
, lib
, perl
, gmp
, libmpc
, mpfr
, bison
, flex
, pahole
, buildPackages
,
}: { nixpkgs
, kernel
, # generate-config.pl flags. see below
generateConfigFlags
, structuredExtraConfig
,
}:
let
nativeBuildInputs =
[ perl gmp libmpc mpfr bison flex pahole ];
passthru = rec {
module = import "${nixpkgs}/nixos/modules/system/boot/kernel_config.nix";
# used also in apache
# { modules = [ { options = res.options; config = svc.config or svc; } ];
# check = false;
# The result is a set of two attributes
moduleStructuredConfig =
(lib.evalModules {
modules = [
module
{
settings = structuredExtraConfig;
_file = "structuredExtraConfig";
}
];
}).config;
structuredConfig = moduleStructuredConfig.settings;
};
in
stdenv.mkDerivation (
{
kernelArch = stdenv.hostPlatform.linuxArch;
extraMakeFlags = [ ];
inherit (kernel) src patches version;
pname = "linux-config";
# Flags that get passed to generate-config.pl
# ignoreConfigErrors: Ignores any config errors in script (eg unused options)
# autoModules: Build every available module
# preferBuiltin: Build modules as builtin
inherit (generateConfigFlags) autoModules preferBuiltin ignoreConfigErrors;
generateConfig = "${nixpkgs}/pkgs/os-specific/linux/kernel/generate-config.pl";
kernelConfig = passthru.moduleStructuredConfig.intermediateNixConfig;
passAsFile = [ "kernelConfig" ];
depsBuildBuild = [ buildPackages.stdenv.cc ];
inherit nativeBuildInputs;
platformName = stdenv.hostPlatform.linux-kernel.name;
# e.g. "bzImage"
kernelTarget = stdenv.hostPlatform.linux-kernel.target;
makeFlags =
lib.optionals (stdenv.hostPlatform.linux-kernel ? makeFlags) stdenv.hostPlatform.linux-kernel.makeFlags;
postPatch =
kernel.postPatch
+ ''
# Patch kconfig to print "###" after every question so that
# generate-config.pl from the generic builder can answer them.
sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
'';
preUnpack = kernel.preUnpack or "";
buildPhase = ''
export buildRoot="''${buildRoot:-build}"
export HOSTCC=$CC_FOR_BUILD
export HOSTCXX=$CXX_FOR_BUILD
export HOSTAR=$AR_FOR_BUILD
export HOSTLD=$LD_FOR_BUILD
# Get a basic config file for later refinement with $generateConfig.
make $makeFlags \
-C . O="$buildRoot" allnoconfig \
HOSTCC=$HOSTCC HOSTCXX=$HOSTCXX HOSTAR=$HOSTAR HOSTLD=$HOSTLD \
CC=$CC OBJCOPY=$OBJCOPY OBJDUMP=$OBJDUMP READELF=$READELF \
$makeFlags
# Create the config file.
echo "generating kernel configuration..."
ln -s "$kernelConfigPath" "$buildRoot/kernel-config"
DEBUG=1 ARCH=$kernelArch KERNEL_CONFIG="$buildRoot/kernel-config" AUTO_MODULES=$autoModules \
PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. MAKE_FLAGS="$makeFlags" \
perl -w $generateConfig
'';
installPhase = "mv $buildRoot/.config $out";
enableParallelBuilding = true;
inherit passthru;
}
)