{ runCommand, nettools, bc, perl, gmp, libmpc, mpfr, kmod, openssl , writeTextFile, ubootTools , hostPlatform }: 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 "}" >> $out '').outPath; in { # Allow overriding stdenv on each buildLinux call stdenv, # The kernel version version, # The version of the kernel module directory modDirVersion ? version, # The kernel source (tarball, git checkout, etc.) src, # Any patches kernelPatches ? [], # Patches for native compiling only nativeKernelPatches ? [], # Patches for cross compiling only crossKernelPatches ? [], # The native kernel .config file configfile, # The cross kernel .config file crossConfigfile ? configfile, # Manually specified nixexpr representing the config # If unspecified, this will be autodetected from the .config config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile), # Cross-compiling config crossConfig ? if allowImportFromDerivation then (readConfig crossConfigfile) else config, # Whether to utilize the controversial import-from-derivation feature to parse the config allowImportFromDerivation ? false }: let inherit (stdenv.lib) hasAttr getAttr optional optionalString optionalAttrs maintainers platforms; installkernel = writeTextFile { name = "installkernel"; executable=true; text = '' #!${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 make $makeFlags prepare actualModDirVersion="$(cat $buildRoot/include/config/kernel.release)" if [ "$actualModDirVersion" != "${modDirVersion}" ]; then echo "Error: 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 @$SOURCE_DATE_EPOCH)") ''; buildFlags = [ "KBUILD_BUILD_VERSION=1-NixOS" platform.kernelTarget "vmlinux" # for "perf" and things like that ] ++ optional isModular "modules"; installFlags = [ "INSTALLKERNEL=${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}/build cp -dpR ../$sourceRoot $dev/lib/modules/${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 # 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/$f fi done # !!! No documentation on how much of the source tree must be kept # If/when kernel builds fail due to missing files, you can add # them here. Note that we may see packages requiring headers # from drivers/ in the future; it adds 50M to keep all of its # headers on 3.10 though. chmod u+w -R ../source arch=$(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 chmod u-w # Keep linker scripts (they are required for out-of-tree modules on aarch64) find . -type f -name '*.lds' -print0 | xargs -0 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 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 = 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; }; }; in stdenv.mkDerivation ((drvAttrs config stdenv.platform (kernelPatches ++ nativeKernelPatches) configfile) // { name = "linux-${version}"; enableParallelBuilding = true; nativeBuildInputs = [ perl bc nettools openssl gmp libmpc mpfr ] ++ optional (stdenv.platform.kernelTarget == "uImage") ubootTools; hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" ]; makeFlags = commonMakeFlags ++ [ "ARCH=${stdenv.platform.kernelArch}" ]; karch = stdenv.platform.kernelArch; crossAttrs = let cp = hostPlatform.platform; in (drvAttrs crossConfig cp (kernelPatches ++ crossKernelPatches) crossConfigfile) // { makeFlags = commonMakeFlags ++ [ "ARCH=${cp.kernelArch}" "CROSS_COMPILE=$(crossConfig)-" ]; karch = cp.kernelArch; nativeBuildInputs = optional (cp.kernelTarget == "uImage") ubootTools; }; })