nixpkgs/pkgs/os-specific/linux/kernel/manual-config.nix

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{ stdenv, runCommand, nettools, bc, perl, kmod, writeTextFile, ubootChooser }:
let
readConfig = configfile: import (runCommand "config.nix" {} ''
echo "{" > "$out"
while IFS='=' read key val; do
[ "x''${key#CONFIG_}" != "x$key" ] || continue
no_firstquote="''${val#\"}";
echo ' "'"$key"'" = "'"''${no_firstquote%\"}"'";' >> "$out"
done < "${configfile}"
echo "}" >> $out
'').outPath;
in {
# The kernel version
version,
# The version of the kernel module directory
modDirVersion ? version,
# The kernel source (tarball, git checkout, etc.)
src,
# Any patches
kernelPatches ? [],
# Patches for native compiling only
nativeKernelPatches ? [],
# Patches for cross compiling only
crossKernelPatches ? [],
# The native kernel .config file
configfile,
# The cross kernel .config file
crossConfigfile ? configfile,
# Manually specified nixexpr representing the config
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# If unspecified, this will be autodetected from the .config
config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
# Cross-compiling config
crossConfig ? if allowImportFromDerivation then (readConfig crossConfigfile) else config,
# Whether to utilize the controversial import-from-derivation feature to parse the config
allowImportFromDerivation ? false
}:
let
inherit (stdenv.lib)
hasAttr getAttr optional optionalString maintainers platforms;
installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
#!${stdenv.shell} -e
mkdir -p $4
cp -av $2 $4
cp -av $3 $4
''; };
commonMakeFlags = [
"O=$(buildRoot)"
];
drvAttrs = config_: platform: kernelPatches: configfile:
let
config = let attrName = attr: "CONFIG_" + attr; in {
isSet = attr: hasAttr (attrName attr) config;
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getValue = attr: if config.isSet attr then getAttr (attrName attr) config else null;
isYes = attr: (config.getValue attr) == "y";
isNo = attr: (config.getValue attr) == "n";
isModule = attr: (config.getValue attr) == "m";
isEnabled = attr: (config.isModule attr) || (config.isYes attr);
isDisabled = attr: (!(config.isSet attr)) || (config.isNo attr);
} // config_;
isModular = config.isYes "MODULES";
installsFirmware = (config.isEnabled "FW_LOADER") &&
(isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
in {
outputs = if isModular then [ "out" "dev" ] else null;
passthru = {
inherit version modDirVersion config kernelPatches;
};
inherit src;
preUnpack = ''
mkdir build
export buildRoot="$(pwd)/build"
'';
patches = map (p: p.patch) kernelPatches;
prePatch = ''
for mf in $(find -name Makefile -o -name Makefile.include -o -name install.sh); do
echo "stripping FHS paths in \`$mf'..."
sed -i "$mf" -e 's|/usr/bin/||g ; s|/bin/||g ; s|/sbin/||g'
done
sed -i Makefile -e 's|= depmod|= ${kmod}/sbin/depmod|'
# Patch kconfig to print "###" after every question so that
# generate-config.pl from the generic builder can answer them.
# This only affects oldaskconfig.
sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
'';
configurePhase = ''
runHook preConfigure
ln -sv ${configfile} $buildRoot/.config
make $makeFlags "''${makeFlagsArray[@]}" oldconfig
runHook postConfigure
'';
buildFlags = [ "KBUILD_BUILD_VERSION=1-NixOS" platform.kernelTarget ] ++ optional isModular "modules";
installFlags = [
"INSTALLKERNEL=${installkernel}"
"INSTALL_PATH=$(out)"
] ++ (optional isModular "INSTALL_MOD_PATH=$(out)")
++ optional installsFirmware "INSTALL_FW_PATH=$(out)/lib/firmware";
# Some image types need special install targets (e.g. uImage is installed with make uinstall)
installTargets = [ (if platform.kernelTarget == "uImage" then "uinstall" else "install") ];
postInstall = optionalString installsFirmware ''
mkdir -p $out/lib/firmware
'' + (if isModular then ''
make modules_install $makeFlags "''${makeFlagsArray[@]}" \
$installFlags "''${installFlagsArray[@]}"
unlink $out/lib/modules/${modDirVersion}/build
unlink $out/lib/modules/${modDirVersion}/source
mkdir -p $dev/lib/modules/${modDirVersion}
cd ..
mv $sourceRoot $dev/lib/modules/${modDirVersion}/source
cd $dev/lib/modules/${modDirVersion}/source
mv $buildRoot/.config $buildRoot/Module.symvers $TMPDIR
rm -fR $buildRoot
mkdir $buildRoot
mv $TMPDIR/.config $TMPDIR/Module.symvers $buildRoot
make modules_prepare $makeFlags "''${makeFlagsArray[@]}"
mv $buildRoot $dev/lib/modules/${modDirVersion}/build
# !!! No documentation on how much of the source tree must be kept
# If/when kernel builds fail due to missing files, you can undelete
# them here
ls -A | grep -v Makefile | xargs rm -fR
'' else optionalString installsFirmware ''
make firmware_install $makeFlags "''${makeFlagsArray[@]}" \
$installFlags "''${installFlagsArray[@]}"
'');
# !!! This leaves references to gcc and kmod in $dev
# that we might be able to avoid
postFixup = if isModular then ''
if [ -z "$dontStrip" ]; then
find $out -name "*.ko" -print0 | xargs -0 -r ''${crossConfig+$crossConfig-}strip -S
fi
# !!! Should this be part of stdenv? Also patchELF should take an argument...
prefix=$dev
patchELF
prefix=$out
'' else null;
meta = {
description =
"The Linux kernel" +
(if kernelPatches == [] then "" else
" (with patches: "
+ stdenv.lib.concatStrings (stdenv.lib.intersperse ", " (map (x: x.name) kernelPatches))
+ ")");
license = "GPLv2";
homepage = http://www.kernel.org/;
maintainers = [
maintainers.shlevy
];
platforms = platforms.linux;
};
};
in
stdenv.mkDerivation ((drvAttrs config stdenv.platform (kernelPatches ++ nativeKernelPatches) configfile) // {
name = "linux-${version}";
enableParallelBuilding = true;
nativeBuildInputs = [ perl bc nettools ] ++ optional (stdenv.platform.uboot != null)
(ubootChooser stdenv.platform.uboot);
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makeFlags = commonMakeFlags ++ [
"ARCH=${stdenv.platform.kernelArch}"
];
crossAttrs = let cp = stdenv.cross.platform; in
(drvAttrs crossConfig cp (kernelPatches ++ crossKernelPatches) crossConfigfile) // {
makeFlags = commonMakeFlags ++ [
"ARCH=${cp.kernelArch}"
"CROSS_COMPILE=$(crossConfig)-"
];
# !!! uboot has messed up cross-compiling, nativeDrv builds arm tools on x86,
# crossDrv builds x86 tools on x86 (but arm uboot). If this is fixed, uboot
# can just go into buildInputs (but not nativeBuildInputs since cp.uboot
# may be different from stdenv.platform.uboot)
buildInputs = optional (cp.uboot != null) (ubootChooser cp.uboot).crossDrv;
};
})