liminix/pkgs/kmodloader/default.nix

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{
liminix
, lib
, targets ? []
, kernel ? null
, runCommand
, pkgsBuildBuild
, dependencies ? []
} :
let
inherit (liminix.services) oneshot;
inherit (lib) concatStringsSep;
loader = runCommand "modules" {
nativeBuildInputs = with pkgsBuildBuild ;[
kmod cpio gawk
];
} ''
kernel=${kernel.modulesupport}
mkdir -p lib/modules/0.0
(cd $kernel && find . -name \*.ko | cpio --verbose --make-directories -p $NIX_BUILD_TOP/lib/modules/0.0)
cp $kernel/modules.* lib/modules/0.0
depmod -b . 0.0
(for i in ${lib.concatStringsSep " " targets}; do
modprobe -S 0.0 -d $NIX_BUILD_TOP --show-depends $i | sed "s,^insmod $NIX_BUILD_TOP/lib/modules/0.0/,,g"
done) | awk '!a[$0]++' > load-order
mkdir $out
for i in $(cat load-order); do
install -v $NIX_BUILD_TOP/lib/modules/0.0/$i -D $out/$i
done
echo "O=$out" > $out/load.sh
sed "s,^,insmod \$O/,g" < load-order >> $out/load.sh
echo "O=$out" > $out/unload.sh
tac load-order | sed "s,^,rmmod \$O/,g" > $out/unload.sh
'';
in oneshot {
name = "kmodloader-" + (concatStringsSep "-" targets);
up = "sh ${loader}/load.sh";
down = "sh ${loader}/unload.sh";
inherit dependencies;
}