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lib.makeOverridable ( # The kernel source tarball. { pname ? "linux",
src,
# The kernel version. version,
# Allows overriding the default defconfig defconfig ? null,
# Legacy overrides to the intermediate kernel config, as string extraConfig ? "",
# Additional make flags passed to kbuild extraMakeFlags ? [ ],
# enables the options in ./common-config.nix and lib/systems/platform.nix; # if `false` then only `structuredExtraConfig` is used enableCommonConfig ? true
, # kernel intermediate config overrides, as a set structuredExtraConfig ? { },
# The version number used for the module directory # If unspecified, this is determined automatically from the version. modDirVersion ? null,
# An attribute set whose attributes express the availability of # certain features in this kernel. E.g. `{ia32Emulation = true;}' # indicates a kernel that provides Intel wireless support. Used in # NixOS to implement kernel-specific behaviour. features ? { },
# Custom seed used for CONFIG_GCC_PLUGIN_RANDSTRUCT if enabled. This is # automatically extended with extra per-version and per-config values. randstructSeed ? "",
# A list of patches to apply to the kernel. Each element of this list # should be an attribute set {name, patch} where `name' is a # symbolic name and `patch' is the actual patch. The patch may # optionally be compressed with gzip or bzip2. kernelPatches ? [ ], ignoreConfigErrors ? !lib.elem stdenv.hostPlatform.linux-kernel.name or "" [ "aarch64-multiplatform" "pc" ], extraMeta ? { }, extraPassthru ? { },
isLTS ? false, isZen ? false,
# easy overrides to stdenv.hostPlatform.linux-kernel members autoModules ? stdenv.hostPlatform.linux-kernel.autoModules or true, preferBuiltin ? stdenv.hostPlatform.linux-kernel.preferBuiltin or false, kernelArch ? stdenv.hostPlatform.linuxArch, kernelTests ? { },
stdenv ? args'.stdenv, buildPackages ? args'.buildPackages, pkgsBuildBuild ? args'.pkgsBuildBuild,
... }@args:
# Note: this package is used for bootstrapping fetchurl, and thus # cannot use fetchpatch! All mutable patches (generated by GitHub or # cgit) that are needed here should be included directly in Nixpkgs as # files.
let # Combine the `features' attribute sets of all the kernel patches. kernelFeatures = lib.foldr (x: y: (x.features or { }) // y) ( { efiBootStub = true; netfilterRPFilter = true; ia32Emulation = true; } // features ) kernelPatches;
commonStructuredConfig = import ./common-config.nix { inherit lib stdenv version; rustAvailable = lib.meta.availableOn stdenv.hostPlatform rustc-unwrapped;
features = kernelFeatures; # Ensure we know of all extra patches, etc. };
intermediateNixConfig = configfile.moduleStructuredConfig.intermediateNixConfig # extra config in legacy string format + extraConfig # need the 'or ""' at the end in case enableCommonConfig = true and extraConfig is not present + lib.optionalString enableCommonConfig stdenv.hostPlatform.linux-kernel.extraConfig or "";
structuredConfigFromPatches = map ( { structuredExtraConfig ? { }, ... }@args: if args ? extraStructuredConfig then throw '' Passing `extraStructuredConfig` to the Linux kernel (e.g. via `boot.kernelPatches` in NixOS) is not supported anymore. Use `structuredExtraConfig` instead. '' else { settings = structuredExtraConfig; } ) kernelPatches;
# appends kernel patches extraConfig kernelConfigFun = baseConfigStr: let configFromPatches = map ( { extraConfig ? "", ... }: extraConfig ) kernelPatches; in lib.concatStringsSep "\n" ([ baseConfigStr ] ++ configFromPatches);
withRust = ((configfile.moduleStructuredConfig.settings.RUST or { }).tristate or null) == "y";
configfile = stdenv.mkDerivation { inherit ignoreConfigErrors autoModules preferBuiltin kernelArch extraMakeFlags ; pname = "linux-config"; inherit version;
generateConfig = ./generate-config.pl;
kernelConfig = kernelConfigFun intermediateNixConfig; passAsFile = [ "kernelConfig" ];
depsBuildBuild = [ buildPackages.stdenv.cc ]; nativeBuildInputs = [ perl gmp libmpc mpfr bison flex ] ++ lib.optional (lib.versionAtLeast version "5.2") pahole ++ lib.optionals withRust [ rust-bindgen-unwrapped rustc-unwrapped ];
RUST_LIB_SRC = lib.optionalString withRust rustPlatform.rustLibSrc;
# e.g. "defconfig" kernelBaseConfig = if defconfig != null then defconfig else stdenv.hostPlatform.linux-kernel.baseConfig or "defconfig";
makeFlags = import ./common-flags.nix { inherit lib stdenv buildPackages extraMakeFlags ; };
postPatch = kernel.postPatch + '' # Patch kconfig to print "###" after every question so that # generate-config.pl from the generic builder can answer them. sed -e '/fflush(stdout);/i\printf("###");' -i scripts/kconfig/conf.c '';
preUnpack = kernel.preUnpack or "";
inherit (kernel) src patches;
buildPhase = '' export buildRoot="''${buildRoot:-build}"
# Get a basic config file for later refinement with $generateConfig. make $makeFlags \ -C . O="$buildRoot" $kernelBaseConfig \ ARCH=$kernelArch CROSS_COMPILE=${stdenv.cc.targetPrefix} \ $makeFlags
# Create the config file. echo "generating kernel configuration..." ln -s "$kernelConfigPath" "$buildRoot/kernel-config" DEBUG=1 ARCH=$kernelArch CROSS_COMPILE=${stdenv.cc.targetPrefix} \ KERNEL_CONFIG="$buildRoot/kernel-config" AUTO_MODULES=$autoModules \ PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. MAKE_FLAGS="$makeFlags" \ perl -w $generateConfig '' + lib.optionalString stdenv.cc.isClang '' if ! grep -Fq CONFIG_CC_IS_CLANG=y $buildRoot/.config; then echo "Kernel config didn't recognize the clang compiler?" exit 1 fi '' + lib.optionalString stdenv.cc.bintools.isLLVM '' if ! grep -Fq CONFIG_LD_IS_LLD=y $buildRoot/.config; then echo "Kernel config didn't recognize the LLVM linker?" exit 1 fi '' + lib.optionalString withRust '' if ! grep -Fq CONFIG_RUST_IS_AVAILABLE=y $buildRoot/.config; then echo "Kernel config didn't find Rust toolchain?" exit 1 fi '';
installPhase = "mv $buildRoot/.config $out";
enableParallelBuilding = true;
passthru = rec { module = import ../../../../nixos/modules/system/boot/kernel_config.nix; # used also in apache # { modules = [ { options = res.options; config = svc.config or svc; } ]; # check = false; # The result is a set of two attributes moduleStructuredConfig = (lib.evalModules { modules = [ module ] ++ lib.optionals enableCommonConfig [ { settings = commonStructuredConfig; _file = "pkgs/os-specific/linux/kernel/common-config.nix"; } ] ++ [ { settings = structuredExtraConfig; _file = "structuredExtraConfig"; } ] ++ structuredConfigFromPatches; }).config;
structuredConfig = moduleStructuredConfig.settings; }; }; # end of configfile derivation
kernel = (callPackage ./build.nix { inherit lib stdenv buildPackages; }) { inherit pname version src kernelPatches randstructSeed extraMakeFlags extraMeta configfile modDirVersion ; pos = builtins.unsafeGetAttrPos "version" args;
config = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "y"; CONFIG_RUST = if withRust then "y" else "n"; }; };
in kernel.overrideAttrs ( finalAttrs: previousAttrs: {
passthru = previousAttrs.passthru or { } // extraPassthru // { features = kernelFeatures; inherit commonStructuredConfig structuredExtraConfig extraMakeFlags isLTS isZen ;
# Adds dependencies needed to edit the config: # nix-shell '<nixpkgs>' -A linux.configEnv --command 'make nconfig' configEnv = finalAttrs.finalPackage.overrideAttrs (previousAttrs: { depsBuildBuild = previousAttrs.depsBuildBuild or [ ] ++ (with pkgsBuildBuild; [ pkg-config ncurses ]); });
tests = let overridableKernel = finalAttrs.finalPackage // { override = args: lib.warn ( "override is stubbed for NixOS kernel tests, not applying changes these arguments: " + toString (lib.attrNames (lib.toFunction args { })) ) overridableKernel; }; /* Certain arguments must be evaluated lazily; so that only the output(s) depend on them. Original reproducer / simplified use case: */ versionDoesNotDependOnPatchesEtcNixOS = builtins.seq (nixos ( { config, pkgs, ... }: { boot.kernelPatches = [ (builtins.seq config.boot.kernelPackages.kernel.version { patch = pkgs.emptyFile; }) ]; } )).config.boot.kernelPackages.kernel.outPath emptyFile; versionDoesNotDependOnPatchesEtc = builtins.seq (import ./generic.nix args' ( args // ( let explain = attrName: '' The ${attrName} attribute must be able to access the kernel.version attribute without an infinite recursion. That means that the kernel attrset (attrNames) and the kernel.version attribute must not depend on the ${attrName} argument. The fact that this exception is raised shows that such a dependency does exist. This is a problem for the configurability of ${attrName} in version-aware logic such as that in NixOS. Strictness can creep in through optional attributes, or assertions and warnings that run as part of code that shouldn't access what is checked. ''; in { kernelPatches = throw (explain "kernelPatches"); structuredExtraConfig = throw (explain "structuredExtraConfig"); modDirVersion = throw (explain "modDirVersion"); } ) )).version emptyFile; in { inherit versionDoesNotDependOnPatchesEtc; testsForKernel = nixosTests.kernel-generic.passthru.testsForKernel overridableKernel; # Disabled by default, because the infinite recursion is hard to understand. The other test's error is better and produces a shorter trace. # inherit versionDoesNotDependOnPatchesEtcNixOS; } // kernelTests; };
} ))