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kernel build: limit dev output footprint
This makes the disk usage footprint of building the kernel smaller in 3 ways: 1) There is no separate kernel source derivation 2) Rather than using the entire build tree, only the output of make modules_prepare is kept in the $dev output (plus the module symbol versioning file generated during the build) 3) Only the subset of the source tree known to be needed for external builds is kept in $dev Note that while 2) is supported by official kernel documentation, I couldn't find any source describing what we need to keep for 3). I've started with the bare minimum (the main Makefile is called by the Makefile generated by make modules_prepare) and we can/should add more as needed for kernelPackages. Signed-off-by: Shea Levy <shea@shealevy.com>
This commit is contained in:
Shea Levy
parent
f95d214cfd
commit
2c38df1c5b
@ -69,18 +69,26 @@ let
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ignoreConfigErrors = true;
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kernelConfig = kernelConfigFun configCross;
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inherit (kernel.crossDrv) src patches prePatch preUnpack;
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};
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buildCommand = ''
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inherit (kernel) src patches prePatch preUnpack;
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buildPhase = ''
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cd $buildRoot
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# Get a basic config file for later refinement with $generateConfig.
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make -C ${kernel.sourceRoot} O=$PWD $kernelBaseConfig ARCH=$arch
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make -C ../$sourceRoot O=$PWD $kernelBaseConfig ARCH=$arch
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# Create the config file.
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echo "generating kernel configuration..."
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echo "$kernelConfig" > kernel-config
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DEBUG=1 ARCH=$arch KERNEL_CONFIG=kernel-config AUTO_MODULES=$autoModules \
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SRC=${kernel.sourceRoot} perl -w $generateConfig
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mv .config $out
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SRC=../$sourceRoot perl -w $generateConfig
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'';
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installPhase = "mv .config $out";
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};
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kernel = linuxManualConfig {
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@ -48,7 +48,7 @@ let
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''; };
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commonMakeFlags = [
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"O=$(buildRoot)" "KBUILD_BUILD_VERSION=1-NixOS"
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"O=$(buildRoot)"
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];
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drvAttrs = config_: platform: kernelPatches: configfile:
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@ -73,48 +73,34 @@ let
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installsFirmware = (config.isEnabled "FW_LOADER") &&
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(isModular || (config.isDisabled "FIRMWARE_IN_KERNEL"));
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sourceRoot = stdenv.mkDerivation {
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name = "linux-source-${version}";
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inherit src;
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patches = map (p: p.patch) kernelPatches;
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phases = [ "unpackPhase" "patchPhase" "installPhase" ];
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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|= ${kmod}/sbin/depmod|'
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# Patch kconfig to print "###" after every question so that
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# generate-config.pl from the generic builder can answer them.
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# This only affects oldaskconfig.
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sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
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'';
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installPhase = ''
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cd ..
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mv $sourceRoot $out
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'';
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};
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in {
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outputs = if isModular then [ "out" "dev" ] else null;
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passthru = {
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inherit version modDirVersion config kernelPatches src;
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inherit version modDirVersion config kernelPatches;
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};
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inherit sourceRoot;
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inherit src;
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unpackPhase = ''
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preUnpack = ''
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mkdir build
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export buildRoot="$(pwd)/build"
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cd ${sourceRoot}
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'';
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patches = map (p: p.patch) kernelPatches;
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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|= ${kmod}/sbin/depmod|'
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# Patch kconfig to print "###" after every question so that
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# generate-config.pl from the generic builder can answer them.
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# This only affects oldaskconfig.
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sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c
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'';
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configurePhase = ''
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@ -124,7 +110,7 @@ let
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runHook postConfigure
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'';
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buildFlags = [ platform.kernelTarget ] ++ optional isModular "modules";
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buildFlags = [ "KBUILD_BUILD_VERSION=1-NixOS" platform.kernelTarget ] ++ optional isModular "modules";
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installFlags = [
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"INSTALLKERNEL=${installkernel}"
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@ -141,22 +127,39 @@ let
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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}
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mv $out/lib/modules/${modDirVersion}/source $dev/lib/modules/${modDirVersion}/source
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cd ..
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mv $sourceRoot $dev/lib/modules/${modDirVersion}/source
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cd $dev/lib/modules/${modDirVersion}/source
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mv $buildRoot/.config $buildRoot/Module.symvers $TMPDIR
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rm -fR $buildRoot
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mkdir $buildRoot
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mv $TMPDIR/.config $TMPDIR/Module.symvers $buildRoot
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make modules_prepare $makeFlags "''${makeFlagsArray[@]}"
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mv $buildRoot $dev/lib/modules/${modDirVersion}/build
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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 undelete
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# them here
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ls -A | grep -v Makefile | xargs rm -fR
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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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# !!! This leaves references to gcc and kmod in $dev
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# that we might be able to avoid
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postFixup = if isModular then ''
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if [ -z "$dontStrip" ]; then
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find $out -name "*.ko" -print0 | xargs -0 -r ''${crossConfig+$crossConfig-}strip -S
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# Remove all references to the source directory to avoid unneeded
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# runtime dependencies
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find $out -name "*.ko" -print0 | xargs -0 -r sed -i \
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"s|${sourceRoot}|$NIX_STORE/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee-${sourceRoot.name}|g"
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fi
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# !!! Should this be part of stdenv? Also patchELF should take an argument...
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prefix=$dev
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patchELF
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prefix=$out
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'' else null;
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meta = {
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