nixpkgs/pkgs/build-support/kernel/modules-closure.nix

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# Given a kernel build (with modules in $kernel/lib/modules/VERSION),
# produce a module tree in $out/lib/modules/VERSION that contains only
# the modules identified by `rootModules', plus their dependencies.
# Also generate an appropriate modules.dep.
{ stdenv, kernel, nukeReferences, rootModules
, kmod, allowMissing ? false }:
stdenv.mkDerivation {
name = kernel.name + "-shrunk";
builder = ./modules-closure.sh;
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buildInputs = [ nukeReferences kmod ];
inherit kernel rootModules allowMissing;
allowedReferences = ["out"];
}