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Install vds_hcd through Kbuild so nixpkgs can sign it #42

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Merged
Retr0astic merged 1 commit into from
Oct 30, 2026
Merged

Install vds_hcd through Kbuild so nixpkgs can sign it #42

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27 changes: 23 additions & 4 deletions nix/vds-module.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,16 @@
, version
}:

let
kdir = "${kernel.dev}/lib/modules/${kernel.modDirVersion}/build";

# The kernel's own make flags. Since nixpkgs started signing modules with
# kmodigest, these carry the `cmd_sign` override that writes the
# vds_hcd.ko.cer certificate NixOS needs when it assembles the module
# tree; without it that build fails (NixOS/nixpkgs#575192). Older kernels
# do not have the attribute and need nothing extra.
kernelFlags = kernel.commonMakeFlags or [ ];
in
stdenv.mkDerivation {
pname = "vds_hcd";
inherit version;
Expand All @@ -17,17 +27,26 @@ stdenv.mkDerivation {
hardeningDisable = [ "pic" ];
nativeBuildInputs = kernel.moduleBuildDependencies;

makeFlags = [
makeFlags = kernelFlags ++ [
"-C" "module"
"KERNELRELEASE=${kernel.modDirVersion}"
"KDIR=${kernel.dev}/lib/modules/${kernel.modDirVersion}/build"
"KDIR=${kdir}"
"VDS_VERSION=${version}"
];

# Install through Kbuild rather than copying the .ko, so the module goes
# through the kernel's signing step. DEPMOD=true keeps it from writing a
# module index into $out; NixOS builds one for the whole tree.
installPhase = ''
runHook preInstall
install -D module/vds_hcd.ko \
$out/lib/modules/${kernel.modDirVersion}/extra/vds_hcd.ko
make -C ${kdir} M="$PWD/module" \
${lib.escapeShellArgs kernelFlags} \
KERNELRELEASE=${kernel.modDirVersion} \
VDS_VERSION=${version} \
INSTALL_MOD_PATH="$out" \
INSTALL_MOD_DIR=extra \
DEPMOD=true \
modules_install
runHook postInstall
'';

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