nixpkgs/pkgs/os-specific/linux/kernel/manual-config.nix
2018-02-16 01:13:30 +02:00

281 lines
10 KiB
Nix

{ buildPackages, runCommand, nettools, bc, bison, flex, perl, gmp, libmpc, mpfr, openssl
, ncurses ? null
, libelf
, utillinux
, writeTextFile, ubootTools
}:
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 "}" >> $out
'').outPath;
in {
# Allow overriding stdenv on each buildLinux call
stdenv,
# The kernel version
version,
# The version of the kernel module directory
modDirVersion ? version,
# The kernel source (tarball, git checkout, etc.)
src,
# Any patches
kernelPatches ? [],
# The kernel .config file
configfile,
# Manually specified nixexpr representing the config
# If unspecified, this will be autodetected from the .config
config ? stdenv.lib.optionalAttrs allowImportFromDerivation (readConfig configfile),
# Use defaultMeta // extraMeta
extraMeta ? {},
# Whether to utilize the controversial import-from-derivation feature to parse the config
allowImportFromDerivation ? false,
hostPlatform
}:
let
inherit (stdenv.lib)
hasAttr getAttr optional optionals optionalString optionalAttrs maintainers platforms;
# Dependencies that are required to build kernel modules
moduleBuildDependencies = optional (stdenv.lib.versionAtLeast version "4.14") libelf;
installkernel = writeTextFile { name = "installkernel"; executable=true; text = ''
#!${stdenv.shell} -e
mkdir -p $4
cp -av $2 $4
cp -av $3 $4
''; };
commonMakeFlags = [
"O=$(buildRoot)"
] ++ stdenv.lib.optionals (hostPlatform.platform ? kernelMakeFlags)
hostPlatform.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
moduleBuildDependencies stdenv;
};
inherit src;
preUnpack = ''
'';
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|= ${buildPackages.kmod}/bin/depmod|'
'';
configurePhase = ''
runHook preConfigure
mkdir build
export buildRoot="$(pwd)/build"
echo "manual-config configurePhase buildRoot=$buildRoot pwd=$PWD"
if [[ -z "$buildRoot" || ! -d "$buildRoot" ]]; then
echo "set $buildRoot to the build folder please"
exit 1
fi
if [ -f "$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 $makeFlags prepare
actualModDirVersion="$(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 $buildRoot
'';
buildFlags = [
"KBUILD_BUILD_VERSION=1-NixOS"
platform.kernelTarget
"vmlinux" # for "perf" and things like that
] ++ optional isModular "modules";
installFlags = [
"INSTALLKERNEL=${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 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 .. $dev/lib/modules/${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/$f
fi
done
# !!! No documentation on how much of the source tree must be kept
# If/when kernel builds fail due to missing files, you can add
# them here. Note that we may see packages requiring headers
# from drivers/ in the future; it adds 50M to keep all of its
# headers on 3.10 though.
chmod u+w -R ..
arch=$(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|= ${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: "
+ stdenv.lib.concatStringsSep ", " (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;
} // extraMeta;
};
in
assert stdenv.lib.versionAtLeast version "4.14" -> libelf != null;
assert stdenv.lib.versionAtLeast version "4.15" -> utillinux != null;
stdenv.mkDerivation ((drvAttrs config hostPlatform.platform kernelPatches configfile) // {
name = "linux-${version}";
enableParallelBuilding = true;
depsBuildBuild = [ buildPackages.stdenv.cc ];
nativeBuildInputs = [ perl bc nettools openssl gmp libmpc mpfr ]
++ optional (stdenv.hostPlatform.platform.kernelTarget == "uImage") buildPackages.ubootTools
++ optional (stdenv.lib.versionAtLeast version "4.14") libelf
++ optional (stdenv.lib.versionAtLeast version "4.15") utillinux
++ optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ]
;
hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" ];
# Absolute paths for compilers avoid any PATH-clobbering issues.
makeFlags = commonMakeFlags ++ [
"CC=${stdenv.cc}/bin/${stdenv.cc.targetPrefix}cc"
"HOSTCC=${buildPackages.stdenv.cc}/bin/${buildPackages.stdenv.cc.targetPrefix}cc"
"ARCH=${stdenv.hostPlatform.platform.kernelArch}"
] ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
];
karch = hostPlatform.platform.kernelArch;
})