nixpkgs/pkgs/os-specific/linux/kernel/generic.nix
Matthew Bauer d0677e6d45 treewide: add warning comment to “boot” packages
This adds a warning to the top of each “boot” package that reads:

  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.

This makes it clear to maintainer that they may need to treat this
package a little differently than others. Importantly, we can’t use
fetchpatch here due to using <nix/fetchurl.nix>. To avoid having stale
hashes, we need to include patches that are subject to changing
overtime (for instance, gitweb’s patches contain a version number at
the bottom).
2020-07-31 08:56:53 +02:00

183 lines
5.9 KiB
Nix

{ buildPackages
, callPackage
, perl
, bison ? null
, flex ? null
, gmp ? null
, libmpc ? null
, mpfr ? null
, stdenv
, # The kernel source tarball.
src
, # The kernel version.
version
, # Allows overriding the default defconfig
defconfig ? null
, # Legacy overrides to the intermediate kernel config, as string
extraConfig ? ""
, # kernel intermediate config overrides, as a set
structuredExtraConfig ? {}
, # The version number used for the module directory
modDirVersion ? version
, # An attribute set whose attributes express the availability of
# certain features in this kernel. E.g. `{iwlwifi = 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 ? stdenv.hostPlatform.platform.name != "pc" ||
stdenv.hostPlatform != stdenv.buildPlatform
, extraMeta ? {}
# easy overrides to stdenv.hostPlatform.platform members
, autoModules ? stdenv.hostPlatform.platform.kernelAutoModules
, preferBuiltin ? stdenv.hostPlatform.platform.kernelPreferBuiltin or false
, kernelArch ? stdenv.hostPlatform.platform.kernelArch
, ...
}:
# 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.
assert stdenv.isLinux;
let
lib = stdenv.lib;
# Combine the `features' attribute sets of all the kernel patches.
kernelFeatures = lib.fold (x: y: (x.features or {}) // y) ({
iwlwifi = true;
efiBootStub = true;
needsCifsUtils = true;
netfilterRPFilter = true;
grsecurity = false;
xen_dom0 = false;
ia32Emulation = true;
} // features) kernelPatches;
commonStructuredConfig = import ./common-config.nix {
inherit stdenv version ;
features = kernelFeatures; # Ensure we know of all extra patches, etc.
};
intermediateNixConfig = configfile.moduleStructuredConfig.intermediateNixConfig
# extra config in legacy string format
+ extraConfig
+ lib.optionalString (stdenv.hostPlatform.platform ? kernelExtraConfig) stdenv.hostPlatform.platform.kernelExtraConfig;
structuredConfigFromPatches =
map ({extraStructuredConfig ? {}, ...}: {settings=extraStructuredConfig;}) kernelPatches;
# appends kernel patches extraConfig
kernelConfigFun = baseConfigStr:
let
configFromPatches =
map ({extraConfig ? "", ...}: extraConfig) kernelPatches;
in lib.concatStringsSep "\n" ([baseConfigStr] ++ configFromPatches);
configfile = stdenv.mkDerivation {
inherit ignoreConfigErrors autoModules preferBuiltin kernelArch;
pname = "linux-config";
inherit version;
generateConfig = ./generate-config.pl;
kernelConfig = kernelConfigFun intermediateNixConfig;
passAsFile = [ "kernelConfig" ];
depsBuildBuild = [ buildPackages.stdenv.cc ];
nativeBuildInputs = [ perl gmp libmpc mpfr ]
++ lib.optionals (stdenv.lib.versionAtLeast version "4.16") [ bison flex ];
platformName = stdenv.hostPlatform.platform.name;
# e.g. "defconfig"
kernelBaseConfig = if defconfig != null then defconfig else stdenv.hostPlatform.platform.kernelBaseConfig;
# e.g. "bzImage"
kernelTarget = stdenv.hostPlatform.platform.kernelTarget;
prePatch = kernel.prePatch + ''
# 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 $generateConfig.
make -C . O="$buildRoot" $kernelBaseConfig \
ARCH=$kernelArch \
HOSTCC=${buildPackages.stdenv.cc.targetPrefix}gcc \
HOSTCXX=${buildPackages.stdenv.cc.targetPrefix}g++
# Create the config file.
echo "generating kernel configuration..."
ln -s "$kernelConfigPath" "$buildRoot/kernel-config"
DEBUG=1 ARCH=$kernelArch KERNEL_CONFIG="$buildRoot/kernel-config" AUTO_MODULES=$autoModules \
PREFER_BUILTIN=$preferBuiltin BUILD_ROOT="$buildRoot" SRC=. perl -w $generateConfig
'';
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
{ 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 ./manual-config.nix {}) {
inherit version modDirVersion src kernelPatches randstructSeed stdenv extraMeta configfile;
config = { CONFIG_MODULES = "y"; CONFIG_FW_LOADER = "m"; };
};
passthru = {
features = kernelFeatures;
inherit commonStructuredConfig;
passthru = kernel.passthru // (removeAttrs passthru [ "passthru" ]);
};
in lib.extendDerivation true passthru kernel