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# SPDX-FileCopyrightText: 2021-2022 Alyssa Ross <hi@alyssa.is>
# SPDX-License-Identifier: MIT
{ config ? import ../../nix/eval-config.nix {}
, rootfs ? import ../rootfs { inherit config; }
}:
let inherit (config) pkgs; in pkgs.callPackage (
{ lib, stdenvNoCC, makeModulesClosure, runCommand, writeReferencesToFile
, pkgsStatic, busybox, cpio, microcodeAmd, microcodeIntel
}:
let
inherit (lib) concatMapStringsSep hasSuffix;
linux = rootfs.kernel;
modules = makeModulesClosure {
inherit (rootfs) firmware kernel;
rootModules = with rootfs.nixosAllHardware.config.boot.initrd;
availableKernelModules ++ kernelModules ++ [ "dm-verity" "loop" ];
};
packages = [
pkgsStatic.execline pkgsStatic.kmod pkgsStatic.mdevd
(pkgsStatic.cryptsetup.override {
programs = {
cryptsetup = false;
cryptsetup-reencrypt = false;
integritysetup = false;
};
})
(busybox.override {
enableStatic = true;
extraConfig = ''
CONFIG_DEPMOD n
CONFIG_FINDFS n
CONFIG_INSMOD n
CONFIG_LSMOD n
CONFIG_MODINFO n
CONFIG_MODPROBE n
CONFIG_RMMOD n
'';
})
];
packagesSysroot = runCommand "packages-sysroot" {} ''
mkdir -p $out/bin
ln -s ${concatMapStringsSep " " (p: "${p}/bin/*") packages} $out/bin
cp -R ${modules}/lib $out
ln -s /bin $out/sbin
# TODO: this is a hack and we should just build the util-linux
# programs we want.
# https://lore.kernel.org/util-linux/87zgrl6ufb.fsf@alyssa.is/
cp ${pkgsStatic.util-linuxMinimal}/bin/{findfs,lsblk} $out/bin
'';
microcode = if stdenvNoCC.hostPlatform.isx86_64 then
runCommand "microcode.cpio" {
nativeBuildInputs = [ cpio ];
} ''
cpio -id < ${microcodeAmd}/amd-ucode.img
cpio -id < ${microcodeIntel}/intel-ucode.img
find kernel | cpio -oH newc -R +0:+0 --reproducible > $out
''
else null;
packagesCpio = runCommand "packages.cpio" {
nativeBuildInputs = [ cpio ];
storePaths = writeReferencesToFile packagesSysroot;
} ''
cd ${packagesSysroot}
(printf "/nix\n/nix/store\n" && find . $(< $storePaths)) |
cpio -o -H newc -R +0:+0 --reproducible > $out
'';
in
stdenvNoCC.mkDerivation {
name = "initramfs";
inherit (config) src;
sourceRoot = "source/host/initramfs";
MICROCODE = microcode;
PACKAGES_CPIO = packagesCpio;
nativeBuildInputs = [ cpio ];
installPhase = ''
runHook preInstall
cp build/initramfs $out
runHook postInstall
'';
enableParallelBuilding = true;
}
) {}
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