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, rootModules, module_init_tools, allowMissing ? false}:
stdenv.mkDerivation {
name = kernel.name + "-shrunk";
builder = ./modules-closure.sh;
inherit kernel rootModules module_init_tools;
allowedReferences = ["out"];
allowMissing = if allowMissing then "true" else "";
}