7ce325f3e0
Having N different copies of the NixOS kernel configuration is bad because these copies tend to diverge. For instance, our 3.10 config lacked some modules that were enabled in older configs, probably because the 3.10 config had been copied off an earlier version of some older kernel config. So now there is a single kernel config in common-config.nix. It has a few conditionals to deal with new/removed kernel options, but otherwise it's pretty straightforward. Also, a lot of cut&paste boilerplate between the kernel Nix expressions is gone (such as preConfigure).
147 lines
4.4 KiB
Nix
147 lines
4.4 KiB
Nix
{ stdenv, fetchurl, perl, mktemp, module_init_tools, bc
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, # The kernel source tarball.
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src
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, # The kernel version.
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version
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, # Overrides to the kernel config.
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extraConfig ? ""
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, # The version number used for the module directory
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modDirVersion ? version
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, # An attribute set whose attributes express the availability of
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# certain features in this kernel. E.g. `{iwlwifi = true;}'
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# indicates a kernel that provides Intel wireless support. Used in
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# NixOS to implement kernel-specific behaviour.
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features ? {}
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, # A list of patches to apply to the kernel. Each element of this list
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# should be an attribute set {name, patch} where `name' is a
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# symbolic name and `patch' is the actual patch. The patch may
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# optionally be compressed with gzip or bzip2.
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kernelPatches ? []
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, # Allows you to set your own kernel version suffix (e.g.,
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# "-my-kernel").
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localVersion ? ""
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, preConfigure ? ""
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, extraMeta ? {}
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, ubootChooser ? null
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, postInstall ? ""
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, # After the builder did a 'make all' (kernel + modules)
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# we force building the target asked: bzImage/zImage/uImage/...
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postBuild ? "make $makeFlags $kernelTarget; make $makeFlags -C scripts unifdef"
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, ...
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}:
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assert stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux"
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|| stdenv.isArm || stdenv.system == "mips64el-linux";
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assert stdenv.platform.name == "sheevaplug" -> stdenv.platform.uboot != null;
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let
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lib = stdenv.lib;
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kernelConfigFun = baseConfig:
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let
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configFromPatches =
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map ({extraConfig ? "", ...}: extraConfig) kernelPatches;
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in lib.concatStringsSep "\n" ([baseConfig] ++ configFromPatches);
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configWithPlatform = kernelPlatform:
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import ./common-config.nix { inherit stdenv version kernelPlatform extraConfig; };
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config = configWithPlatform stdenv.platform;
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configCross = configWithPlatform stdenv.cross.platform;
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in
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stdenv.mkDerivation {
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name = "linux-${version}";
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enableParallelBuilding = true;
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passthru = {
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inherit version modDirVersion kernelPatches;
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# Combine the `features' attribute sets of all the kernel patches.
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features = lib.fold (x: y: (x.features or {}) // y) features kernelPatches;
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};
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builder = ./builder.sh;
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generateConfig = ./generate-config.pl;
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inherit preConfigure src module_init_tools localVersion postInstall postBuild;
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patches = map (p: p.patch) kernelPatches;
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kernelConfig = kernelConfigFun config;
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# For UML and non-PC, just ignore all options that don't apply (We are lazy).
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ignoreConfigErrors = stdenv.platform.name != "pc";
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nativeBuildInputs = [ perl mktemp bc ];
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buildInputs = lib.optional (stdenv.platform.uboot != null)
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(ubootChooser stdenv.platform.uboot);
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platformName = stdenv.platform.name;
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kernelBaseConfig = stdenv.platform.kernelBaseConfig;
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kernelTarget = stdenv.platform.kernelTarget;
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autoModules = stdenv.platform.kernelAutoModules;
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# Should we trust platform.kernelArch? We can only do
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# that once we differentiate i686/x86_64 in platforms.
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arch =
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if stdenv.system == "i686-linux" then "i386" else
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if stdenv.system == "x86_64-linux" then "x86_64" else
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if stdenv.isArm then "arm" else
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if stdenv.system == "mips64el-linux" then "mips" else
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abort "Platform ${stdenv.system} is not supported.";
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crossAttrs = let
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cp = stdenv.cross.platform;
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in
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assert cp.name == "sheevaplug" -> cp.uboot != null;
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{
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arch = cp.kernelArch;
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platformName = cp.name;
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kernelBaseConfig = cp.kernelBaseConfig;
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kernelTarget = cp.kernelTarget;
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autoModules = cp.kernelAutoModules;
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# Just ignore all options that don't apply (We are lazy).
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ignoreConfigErrors = true;
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kernelConfig = kernelConfigFun configCross;
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# The substitution of crossAttrs happens *after* the stdenv cross adapter sets
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# the parameters for the usual stdenv. Thus, we need to specify
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# the ".crossDrv" in the buildInputs here.
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buildInputs = lib.optional (cp.uboot != null) (ubootChooser cp.uboot).crossDrv;
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};
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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.concatStrings (lib.intersperse ", " (map (x: x.name) kernelPatches))
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+ ")");
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license = "GPLv2";
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homepage = http://www.kernel.org/;
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maintainers = [
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lib.maintainers.eelco
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lib.maintainers.chaoflow
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];
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platforms = lib.platforms.linux;
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} // extraMeta;
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}
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