source $stdenv/setup # When no modules are built, the $out/lib/modules directory will not # exist. Because the rest of the script assumes it does exist, we # handle this special case first. if ! test -d "$kernel/lib/modules"; then if test -z "$rootModules" || test -n "$allowMissing"; then mkdir -p "$out" exit 0 else echo "Required modules: $rootModules" echo "Can not derive a closure of kernel modules because no modules were provided." exit 1 fi fi version=$(cd $kernel/lib/modules && ls -d *) echo "kernel version is $version" # Determine the dependencies of each root module. mkdir -p $out/lib/modules/"$version" touch closure for module in $rootModules; do echo "root module: $module" modprobe --config no-config -d $kernel --set-version "$version" --show-depends "$module" \ | while read cmd module args; do case "$cmd" in builtin) touch found echo "$module" >>closure echo " builtin dependency: $module";; insmod) touch found if ! test -e "$module"; then echo " dependency not found: $module" exit 1 fi target=$(echo "$module" | sed "s^$NIX_STORE.*/lib/modules/^$out/lib/modules/^") if test -e "$target"; then echo " dependency already copied: $module" continue fi echo "$module" >>closure echo " copying dependency: $module" mkdir -p $(dirname $target) cp "$module" "$target" # If the kernel is compiled with coverage instrumentation, it # contains the paths of the *.gcda coverage data output files # (which it doesn't actually use...). Get rid of them to prevent # the whole kernel from being included in the initrd. nuke-refs "$target" echo "$target" >> $out/insmod-list;; *) echo " unexpected modprobe output: $cmd $module" exit 1;; esac done || test -n "$allowMissing" if ! test -e found; then echo " not found" if test -z "$allowMissing"; then exit 1 fi else rm found fi done mkdir -p $out/lib/firmware for module in $(cat closure); do # for builtin modules, modinfo will reply with a wrong output looking like: # $ modinfo -F firmware unix # name: unix # # There is a pending attempt to fix this: # https://github.com/NixOS/nixpkgs/pull/96153 # https://lore.kernel.org/linux-modules/20200823215433.j5gc5rnsmahpf43v@blumerang/T/#u # # For now, the workaround is just to filter out the extraneous lines out # of its output. for i in $(modinfo -b $kernel --set-version "$version" -F firmware $module | grep -v '^name:'); do mkdir -p "$out/lib/firmware/$(dirname "$i")" echo "firmware for $module: $i" cp "$firmware/lib/firmware/$i" "$out/lib/firmware/$i" 2>/dev/null || if test -z "$allowMissing"; then exit 1; fi done done # copy module ordering hints for depmod cp $kernel/lib/modules/"$version"/modules.order $out/lib/modules/"$version"/. cp $kernel/lib/modules/"$version"/modules.builtin $out/lib/modules/"$version"/. depmod -b $out -a $version # remove original hints from final derivation rm $out/lib/modules/"$version"/modules.order rm $out/lib/modules/"$version"/modules.builtin