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{ stdenv, runCommand, nettools, bc, perl, kmod, openssl, 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 "}" >> $out
'').outPath;
in {
# The kernel version
version,
# The version of the kernel module directory
modDirVersion ? version,
# The kernel source (tarball, git checkout, etc.)
src,
# Any patches
kernelPatches ? [],
# Patches for native compiling only
nativeKernelPatches ? [],
# Patches for cross compiling only
crossKernelPatches ? [],
# The native kernel .config file
configfile,
# The cross kernel .config file
crossConfigfile ? configfile,
# Manually specified nixexpr representing the config
# If unspecified, this will be autodetected from the .config
config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
# Cross-compiling config
crossConfig ? if allowImportFromDerivation then (readConfig crossConfigfile) else config,
# Whether to utilize the controversial import-from-derivation feature to parse the config
allowImportFromDerivation ? false
}:
let
inherit (stdenv.lib)
hasAttr getAttr optional optionalString optionalAttrs maintainers platforms;
installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
#!${stdenv.shell} -e
mkdir -p $4
cp -av $2 $4
cp -av $3 $4
''; };
commonMakeFlags = [
"O=$(buildRoot)"
] ++ stdenv.lib.optionals (stdenv.platform ? kernelMakeFlags)
stdenv.platform.kernelMakeFlags;
drvAttrs = config_: platform: kernelPatches: configfile:
let
config = let attrName = attr: "CONFIG_" + attr; in {
isSet = attr: hasAttr (attrName attr) config;
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 (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
passthru = {
inherit version modDirVersion config kernelPatches configfile;
};
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}/bin/depmod|'
'';
configurePhase = ''
runHook preConfigure
ln -sv ${configfile} $buildRoot/.config
make $makeFlags "''${makeFlagsArray[@]}" oldconfig
runHook postConfigure
# Note: we can get rid of this once http://permalink.gmane.org/gmane.linux.kbuild.devel/13800 is merged.
buildFlagsArray+=("KBUILD_BUILD_TIMESTAMP=$(date -u -d @$SOURCE_DATE_EPOCH)")
'';
buildFlags = [
"KBUILD_BUILD_VERSION=1-NixOS"
platform.kernelTarget
"vmlinux" # for "perf" and things like that
] ++ 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
if platform.kernelTarget == "zImage" || platform.kernelTarget == "Image.gz" then "zinstall" else
"install") ];
postInstall = ''
mkdir -p $dev
cp $buildRoot/vmlinux $dev/
'' + (optionalString installsFirmware ''
mkdir -p $out/lib/firmware
'') + (if (platform ? kernelDTB && platform.kernelDTB) then ''
make $makeFlags "''${makeFlagsArray[@]}" dtbs dtbs_install INSTALL_DTBS_PATH=$out/dtbs
'' else "") + (if isModular then ''
if [ -z "$dontStrip" ]; then
installFlagsArray+=("INSTALL_MOD_STRIP=1")
fi
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 add
# them here. Note that we may see packages requiring headers
# from drivers/ in the future; it adds 50M to keep all of its
# headers on 3.10 though.
chmod +w -R ../source
arch=`cd $dev/lib/modules/${modDirVersion}/build/arch; ls`
# Remove unusued arches
mv arch/$arch .
rm -fR arch
mkdir arch
mv $arch arch
# Remove all driver-specific code (50M of which is headers)
rm -fR drivers
# Keep all headers
find . -type f -name '*.h' -print0 | xargs -0 chmod -w
# Keep root and arch-specific Makefiles
chmod -w Makefile
chmod -w arch/$arch/Makefile*
# Keep whole scripts dir
chmod -w -R scripts
# Delete everything not kept
find . -type f -perm -u=w -print0 | xargs -0 rm
# Delete empty directories
find -empty -type d -delete
# Remove reference to kmod
sed -i Makefile -e 's|= ${kmod}/bin/depmod|= depmod|'
'' else optionalString installsFirmware ''
make firmware_install $makeFlags "''${makeFlagsArray[@]}" \
$installFlags "''${installFlagsArray[@]}"
'');
requiredSystemFeatures = [ "big-parallel" ];
meta = {
description =
"The Linux kernel" +
(if kernelPatches == [] then "" else
" (with patches: "
+ stdenv.lib.concatStrings (stdenv.lib.intersperse ", " (map (x: x.name) kernelPatches))
+ ")");
license = stdenv.lib.licenses.gpl2;
homepage = http://www.kernel.org/;
repositories.git = https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git;
maintainers = [
maintainers.thoughtpolice
];
platforms = platforms.linux;
};
};
in
stdenv.mkDerivation ((drvAttrs config stdenv.platform (kernelPatches ++ nativeKernelPatches) configfile) // {
name = "linux-${version}";
enableParallelBuilding = true;
nativeBuildInputs = [ perl bc nettools openssl ] ++ optional (stdenv.platform.uboot != null)
(ubootChooser stdenv.platform.uboot);
hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" ];
makeFlags = commonMakeFlags ++ [
"ARCH=${stdenv.platform.kernelArch}"
];
karch = stdenv.platform.kernelArch;
crossAttrs = let cp = stdenv.cross.platform; in
(drvAttrs crossConfig cp (kernelPatches ++ crossKernelPatches) crossConfigfile) // {
makeFlags = commonMakeFlags ++ [
"ARCH=${cp.kernelArch}"
"CROSS_COMPILE=$(crossConfig)-"
];
karch = cp.kernelArch;
# !!! 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;
};
})
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