mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-12-15 18:23:09 +00:00
ea167e8ccb
This is just for practicity, as it allows users of buildLinux to pass along extra flags they need in the kernel's make invocation. This makes, for example, supporting LLVM _much_ easier, and could enable us in the future to provide clang-built kernels.
336 lines
13 KiB
Nix
336 lines
13 KiB
Nix
{ lib, buildPackages, runCommand, nettools, bc, bison, flex, perl, rsync, gmp, libmpc, mpfr, openssl
|
|
, libelf, cpio, elfutils, zstd, gawk, python3Minimal
|
|
, writeTextFile
|
|
}:
|
|
|
|
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 "}" >> $out
|
|
'').outPath;
|
|
in {
|
|
lib,
|
|
# Allow overriding stdenv on each buildLinux call
|
|
stdenv,
|
|
# The kernel version
|
|
version,
|
|
# Additional kernel make flags
|
|
extraMakeFlags ? [],
|
|
# The version of the kernel module directory
|
|
modDirVersion ? version,
|
|
# The kernel source (tarball, git checkout, etc.)
|
|
src,
|
|
# a list of { name=..., patch=..., extraConfig=...} patches
|
|
kernelPatches ? [],
|
|
# The kernel .config file
|
|
configfile,
|
|
# Manually specified nixexpr representing the config
|
|
# If unspecified, this will be autodetected from the .config
|
|
config ? lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
|
|
# Custom seed used for CONFIG_GCC_PLUGIN_RANDSTRUCT if enabled. This is
|
|
# automatically extended with extra per-version and per-config values.
|
|
randstructSeed ? "",
|
|
# Use defaultMeta // extraMeta
|
|
extraMeta ? {},
|
|
|
|
# for module compatibility
|
|
isZen ? false,
|
|
isLibre ? false,
|
|
isHardened ? false,
|
|
|
|
# Whether to utilize the controversial import-from-derivation feature to parse the config
|
|
allowImportFromDerivation ? false,
|
|
# ignored
|
|
features ? null,
|
|
}:
|
|
|
|
let
|
|
inherit (lib)
|
|
hasAttr getAttr optional optionals optionalString optionalAttrs maintainers platforms;
|
|
|
|
# Dependencies that are required to build kernel modules
|
|
moduleBuildDependencies = optional (lib.versionAtLeast version "4.14") libelf;
|
|
|
|
installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
|
|
#!${stdenv.shell} -e
|
|
mkdir -p $4
|
|
cp -av $2 $4
|
|
cp -av $3 $4
|
|
''; };
|
|
|
|
commonMakeFlags = [
|
|
"O=$(buildRoot)"
|
|
] ++ lib.optionals (stdenv.hostPlatform.linux-kernel ? makeFlags)
|
|
stdenv.hostPlatform.linux-kernel.makeFlags;
|
|
|
|
drvAttrs = config_: kernelConf: 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")) &&
|
|
(lib.versionOlder version "4.14");
|
|
in (optionalAttrs isModular { outputs = [ "out" "dev" ]; }) // {
|
|
passthru = {
|
|
inherit version modDirVersion config kernelPatches configfile
|
|
moduleBuildDependencies stdenv;
|
|
inherit isZen isHardened isLibre;
|
|
isXen = lib.warn "The isXen attribute is deprecated. All Nixpkgs kernels that support it now have Xen enabled." true;
|
|
kernelOlder = lib.versionOlder version;
|
|
kernelAtLeast = lib.versionAtLeast version;
|
|
};
|
|
|
|
inherit src;
|
|
|
|
patches =
|
|
map (p: p.patch) kernelPatches
|
|
# Required for deterministic builds along with some postPatch magic.
|
|
++ optional (lib.versionAtLeast version "4.13") ./randstruct-provide-seed.patch
|
|
# Fixes determinism by normalizing metadata for the archive of kheaders
|
|
++ optional (lib.versionAtLeast version "5.2" && lib.versionOlder version "5.4") ./gen-kheaders-metadata.patch;
|
|
|
|
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|= ${buildPackages.kmod}/bin/depmod|'
|
|
|
|
# Don't include a (random) NT_GNU_BUILD_ID, to make the build more deterministic.
|
|
# This way kernels can be bit-by-bit reproducible depending on settings
|
|
# (e.g. MODULE_SIG and SECURITY_LOCKDOWN_LSM need to be disabled).
|
|
# See also https://kernelnewbies.org/BuildId
|
|
sed -i Makefile -e 's|--build-id=[^ ]*|--build-id=none|'
|
|
|
|
patchShebangs scripts
|
|
'';
|
|
|
|
postPatch = ''
|
|
# Set randstruct seed to a deterministic but diversified value. Note:
|
|
# we could have instead patched gen-random-seed.sh to take input from
|
|
# the buildFlags, but that would require also patching the kernel's
|
|
# toplevel Makefile to add a variable export. This would be likely to
|
|
# cause future patch conflicts.
|
|
if [ -f scripts/gcc-plugins/gen-random-seed.sh ]; then
|
|
substituteInPlace scripts/gcc-plugins/gen-random-seed.sh \
|
|
--replace NIXOS_RANDSTRUCT_SEED \
|
|
$(echo ${randstructSeed}${src} ${configfile} | sha256sum | cut -d ' ' -f 1 | tr -d '\n')
|
|
fi
|
|
'';
|
|
|
|
configurePhase = ''
|
|
runHook preConfigure
|
|
|
|
mkdir build
|
|
export buildRoot="$(pwd)/build"
|
|
|
|
echo "manual-config configurePhase buildRoot=$buildRoot pwd=$PWD"
|
|
|
|
if [ -f "$buildRoot/.config" ]; then
|
|
echo "Could not link $buildRoot/.config : file exists"
|
|
exit 1
|
|
fi
|
|
ln -sv ${configfile} $buildRoot/.config
|
|
|
|
# reads the existing .config file and prompts the user for options in
|
|
# the current kernel source that are not found in the file.
|
|
make $makeFlags "''${makeFlagsArray[@]}" oldconfig
|
|
runHook postConfigure
|
|
|
|
make $makeFlags "''${makeFlagsArray[@]}" prepare
|
|
actualModDirVersion="$(cat $buildRoot/include/config/kernel.release)"
|
|
if [ "$actualModDirVersion" != "${modDirVersion}" ]; then
|
|
echo "Error: modDirVersion ${modDirVersion} specified in the Nix expression is wrong, it should be: $actualModDirVersion"
|
|
exit 1
|
|
fi
|
|
|
|
# Note: we can get rid of this once http://permalink.gmane.org/gmane.linux.kbuild.devel/13800 is merged.
|
|
buildFlagsArray+=("KBUILD_BUILD_TIMESTAMP=$(date -u -d @$SOURCE_DATE_EPOCH)")
|
|
|
|
cd $buildRoot
|
|
'';
|
|
|
|
buildFlags = [
|
|
"KBUILD_BUILD_VERSION=1-NixOS"
|
|
kernelConf.target
|
|
"vmlinux" # for "perf" and things like that
|
|
]
|
|
++ optional isModular "modules"
|
|
++ extraMakeFlags;
|
|
|
|
installFlags = [
|
|
"INSTALLKERNEL=${installkernel}"
|
|
"INSTALL_PATH=$(out)"
|
|
] ++ (optional isModular "INSTALL_MOD_PATH=$(out)")
|
|
++ optional installsFirmware "INSTALL_FW_PATH=$(out)/lib/firmware";
|
|
|
|
preInstall = ''
|
|
installFlagsArray+=("-j$NIX_BUILD_CORES")
|
|
'';
|
|
|
|
# Some image types need special install targets (e.g. uImage is installed with make uinstall)
|
|
installTargets = [
|
|
(kernelConf.installTarget or (
|
|
/**/ if kernelConf.target == "uImage" then "uinstall"
|
|
else if kernelConf.target == "zImage" || kernelConf.target == "Image.gz" then "zinstall"
|
|
else "install"))
|
|
];
|
|
|
|
postInstall = (optionalString installsFirmware ''
|
|
mkdir -p $out/lib/firmware
|
|
'') + (if (kernelConf.DTB or false) then ''
|
|
make $makeFlags "''${makeFlagsArray[@]}" dtbs dtbs_install INSTALL_DTBS_PATH=$out/dtbs
|
|
'' else "") + (if isModular then ''
|
|
mkdir -p $dev
|
|
cp vmlinux $dev/
|
|
if [ -z "''${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}/{build,source}
|
|
|
|
# To save space, exclude a bunch of unneeded stuff when copying.
|
|
(cd .. && rsync --archive --prune-empty-dirs \
|
|
--exclude='/build/' \
|
|
* $dev/lib/modules/${modDirVersion}/source/)
|
|
|
|
cd $dev/lib/modules/${modDirVersion}/source
|
|
|
|
cp $buildRoot/{.config,Module.symvers} $dev/lib/modules/${modDirVersion}/build
|
|
make modules_prepare $makeFlags "''${makeFlagsArray[@]}" O=$dev/lib/modules/${modDirVersion}/build
|
|
|
|
# For reproducibility, removes accidental leftovers from a `cc1` call
|
|
# from a `try-run` call from the Makefile
|
|
rm -f $dev/lib/modules/${modDirVersion}/build/.[0-9]*.d
|
|
|
|
# Keep some extra files on some arches (powerpc, aarch64)
|
|
for f in arch/powerpc/lib/crtsavres.o arch/arm64/kernel/ftrace-mod.o; do
|
|
if [ -f "$buildRoot/$f" ]; then
|
|
cp $buildRoot/$f $dev/lib/modules/${modDirVersion}/build/$f
|
|
fi
|
|
done
|
|
|
|
# !!! No documentation on how much of the source tree must be kept
|
|
# If/when kernel builds fail due to missing files, you can add
|
|
# them here. Note that we may see packages requiring headers
|
|
# from drivers/ in the future; it adds 50M to keep all of its
|
|
# headers on 3.10 though.
|
|
|
|
chmod u+w -R ..
|
|
arch=$(cd $dev/lib/modules/${modDirVersion}/build/arch; ls)
|
|
|
|
# Remove unused arches
|
|
for d in $(cd arch/; ls); do
|
|
if [ "$d" = "$arch" ]; then continue; fi
|
|
if [ "$arch" = arm64 ] && [ "$d" = arm ]; then continue; fi
|
|
rm -rf arch/$d
|
|
done
|
|
|
|
# Remove all driver-specific code (50M of which is headers)
|
|
rm -fR drivers
|
|
|
|
# Keep all headers
|
|
find . -type f -name '*.h' -print0 | xargs -0 -r chmod u-w
|
|
|
|
# Keep linker scripts (they are required for out-of-tree modules on aarch64)
|
|
find . -type f -name '*.lds' -print0 | xargs -0 -r chmod u-w
|
|
|
|
# Keep root and arch-specific Makefiles
|
|
chmod u-w Makefile
|
|
chmod u-w arch/$arch/Makefile*
|
|
|
|
# Keep whole scripts dir
|
|
chmod u-w -R scripts
|
|
|
|
# Delete everything not kept
|
|
find . -type f -perm -u=w -print0 | xargs -0 -r rm
|
|
|
|
# Delete empty directories
|
|
find -empty -type d -delete
|
|
|
|
# Remove reference to kmod
|
|
sed -i Makefile -e 's|= ${buildPackages.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: "
|
|
+ lib.concatStringsSep ", " (map (x: x.name) kernelPatches)
|
|
+ ")");
|
|
license = lib.licenses.gpl2Only;
|
|
homepage = "https://www.kernel.org/";
|
|
repositories.git = "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git";
|
|
maintainers = [
|
|
maintainers.thoughtpolice
|
|
];
|
|
platforms = platforms.linux;
|
|
timeout = 14400; # 4 hours
|
|
} // extraMeta;
|
|
};
|
|
in
|
|
|
|
assert (lib.versionAtLeast version "4.14" && lib.versionOlder version "5.8") -> libelf != null;
|
|
assert lib.versionAtLeast version "5.8" -> elfutils != null;
|
|
|
|
stdenv.mkDerivation ((drvAttrs config stdenv.hostPlatform.linux-kernel kernelPatches configfile) // {
|
|
pname = "linux";
|
|
inherit version;
|
|
|
|
enableParallelBuilding = true;
|
|
|
|
depsBuildBuild = [ buildPackages.stdenv.cc ];
|
|
nativeBuildInputs = [ perl bc nettools openssl rsync gmp libmpc mpfr gawk zstd python3Minimal ]
|
|
++ optional (stdenv.hostPlatform.linux-kernel.target == "uImage") buildPackages.ubootTools
|
|
++ optional (lib.versionAtLeast version "4.14" && lib.versionOlder version "5.8") libelf
|
|
# Removed util-linuxMinimal since it should not be a dependency.
|
|
++ optionals (lib.versionAtLeast version "4.16") [ bison flex ]
|
|
++ optional (lib.versionAtLeast version "5.2") cpio
|
|
++ optional (lib.versionAtLeast version "5.8") elfutils
|
|
;
|
|
|
|
hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" "pie" ];
|
|
|
|
# Absolute paths for compilers avoid any PATH-clobbering issues.
|
|
makeFlags = commonMakeFlags ++ [
|
|
"CC=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
|
|
"HOSTCC=${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc"
|
|
"ARCH=${stdenv.hostPlatform.linuxArch}"
|
|
] ++ lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
|
|
"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
|
|
] ++ extraMakeFlags;
|
|
|
|
karch = stdenv.hostPlatform.linuxArch;
|
|
})
|