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mobile-nixos.kernel-builder
This commit is contained in:
Samuel Dionne-Riel
parent
3844f4d209
commit
d737e0fd3e
207
overlay/mobile-nixos/kernel/builder.nix
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207
overlay/mobile-nixos/kernel/builder.nix
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@ -0,0 +1,207 @@
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#
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# mobile-nixos kernel builder
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# ===========================
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#
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# The goal of this kernel builder is to cover most of the kernels with a
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# simpler interface.
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#
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# Since many kernels will be of older vintages, not supported by NixOS'
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# own kernel build infrastructure, this will live as a more limited builder,
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# with the goal of building most kernels supported.
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#
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# It is also an experiments ground for a more ergonomic interface.
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#
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{ stdenv
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, path
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, buildPackages
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, writeTextFile
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, perl
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, bc
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, nettools
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, openssl
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, rsync
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, gmp
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, libmpc
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, mpfr
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, libelf
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, utillinux
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, bison
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, flex
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}:
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let
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# FIXME : implement some basic rules for most version strings.
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modDirify = v: v;
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in
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{ src
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, version
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, modDirVersion ? modDirify version
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, configfile
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# FIXME : Not used anymore...
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, dtb ? null
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, kernelPatches ? []
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, patches ? []
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, postPatch ? ""
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# Part of the "API" of the kernel builder.
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# Image builders expect this attribute to know where to find the kernel file.
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, file ? "Image" # FIXME : make more generic?
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# FIXME : useful?
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, isModular ? true
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, installsFirmware ? true
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}:
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let
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hasDTB = (dtb != null);
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commonMakeFlags = [
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"O=$(buildRoot)"
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]
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++ stdenv.lib.optionals (stdenv.hostPlatform.platform ? kernelMakeFlags) stdenv.hostPlatform.platform.kernelMakeFlags
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;
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# Path within <nixpkgs> to refer to the kernel build system's file.
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nixosPath = "${path}/pkgs/os-specific/linux/kernel/";
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# Same installer as in <nixpkgs>, though they don't expose it :/.
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installkernel = writeTextFile {
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name = "installkernel";
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executable=true;
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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 $4
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'';
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};
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# Shortcuts
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inherit (stdenv.lib) optionals optional optionalString;
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inherit (stdenv.hostPlatform) platform;
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in
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stdenv.mkDerivation {
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pname = "linux";
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inherit src version file;
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depsBuildBuild = [ buildPackages.stdenv.cc ];
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nativeBuildInputs = [ perl bc nettools openssl rsync gmp libmpc mpfr ]
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++ optional (stdenv.hostPlatform.platform.kernelTarget == "uImage") buildPackages.ubootTools
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++ optional (stdenv.lib.versionAtLeast version "4.14") libelf
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++ optional (stdenv.lib.versionAtLeast version "4.15") utillinux
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++ optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ]
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;
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patches =
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map (p: p.patch) kernelPatches
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# Required for deterministic builds along with some postPatch magic.
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++ optional (stdenv.lib.versionAtLeast version "4.13") "${nixosPath}/randstruct-provide-seed.patch"
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++ patches
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;
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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|= ${buildPackages.kmod}/bin/depmod|'
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if [ -e scripts/ld-version.sh ]; then
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sed -i scripts/ld-version.sh -e "s|/usr/bin/awk|${buildPackages.gawk}/bin/awk|"
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fi
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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 ${src} ${configfile} | sha256sum | cut -d ' ' -f 1 | tr -d '\n')
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fi
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${postPatch}
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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 $buildRoot
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'';
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buildFlags = [
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"KBUILD_BUILD_VERSION=1-mobile-nixos"
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platform.kernelTarget
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"vmlinux" # for "perf" and things like that
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]
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++ optional isModular "modules"
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;
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installFlags = [
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"INSTALLKERNEL=${installkernel}"
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"INSTALL_PATH=$(out)"
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]
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++ optional isModular "INSTALL_MOD_PATH=$(out)"
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++ optional installsFirmware "INSTALL_FW_PATH=$(out)/lib/firmware"
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;
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postInstall = ''
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# Helpful in cases where the kernel isn't built with /proc/config.gz
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cp -v "$buildRoot/.config" "$out/build.config"
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'' + optionalString hasDTB ''
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mkdir -p $out/dtbs/
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make $makeFlags "''${makeFlagsArray[@]}" dtbs dtbs_install INSTALL_DTBS_PATH=$out/dtbs
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''
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;
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hardeningDisable = [ "bindnow" "format" "fortify" "stackprotector" "pic" "pie" ];
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# Absolute paths for compilers avoid any PATH-clobbering issues.
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makeFlags = commonMakeFlags ++ [
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"CC=${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.platform.kernelArch}"
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] ++ stdenv.lib.optional (stdenv.hostPlatform != stdenv.buildPlatform) [
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"CROSS_COMPILE=${stdenv.cc.targetPrefix}"
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];
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requiredSystemFeatures = [ "big-parallel" ];
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enableParallelBuilding = true;
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dontStrip = true;
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}
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@ -85,4 +85,13 @@ in
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input: input != self.valgrind-light
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) oldAttrs.buildInputs;
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});
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# Things specific to mobile-nixos.
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# Not necessarily internals, but they probably won't go into <nixpkgs>.
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mobile-nixos = {
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kernel-builder = callPackage ./mobile-nixos/kernel/builder.nix {};
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kernel-builder-gcc6 = callPackage ./mobile-nixos/kernel/builder.nix {
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stdenv = with self; overrideCC stdenv buildPackages.gcc6;
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};
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};
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}
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@ -1,20 +1,15 @@
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{
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device_config
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, initrd
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, pkgs
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{ device_config
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, initrd
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, pkgs
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}:
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let
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inherit (pkgs) buildPackages;
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in
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let
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inherit (device_info) kernel dtb;
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device_name = device_config.name;
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device_info = device_config.info;
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with_qcdt = device_info ? bootimg_qcdt && device_info.bootimg_qcdt;
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linux = device_info.kernel;
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kernel = ''${linux}/${linux.image}'';
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# TODO : make configurable
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dt = "${linux}/boot/dt.img";
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with_qcdt = device_info ? bootimg_qcdt && device_info.bootimg_qcdt;
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kernel_file = if device_info ? kernel_file then device_info.kernel_file else "${kernel}/${kernel.file}";
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# TODO : Allow appending / prepending
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cmdline = device_info.kernel_cmdline;
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@ -30,20 +25,16 @@ pkgs.stdenv.mkDerivation {
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buildPackages.dtbTool
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];
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buildInputs = [
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linux
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];
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installPhase = ''
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echo Using kernel: ${kernel}
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echo Using kernel: ${kernel_file}
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(
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PS4=" $ "
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set -x
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mkbootimg \
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--kernel ${kernel} \
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--kernel ${kernel_file} \
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${
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if with_qcdt then
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"--dt ${dt}"
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"--dt ${dtb}"
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else
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""
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} \
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