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