diff options
Diffstat (limited to 'nixpkgs/pkgs/build-support/kernel/modules-closure.sh')
| -rw-r--r-- | nixpkgs/pkgs/build-support/kernel/modules-closure.sh | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/build-support/kernel/modules-closure.sh b/nixpkgs/pkgs/build-support/kernel/modules-closure.sh new file mode 100644 index 000000000000..06eb5b0d0de1 --- /dev/null +++ b/nixpkgs/pkgs/build-support/kernel/modules-closure.sh @@ -0,0 +1,100 @@ +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 "$allowMissing"; then + exit 1 + fi + else + rm found + fi +done + +cd "$firmware" +for module in $(< ~-/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. + modinfo -b $kernel --set-version "$version" -F firmware $module | grep -v '^name:' | while read -r i; do + echo "firmware for $module: $i" + for name in "$i" "$i.xz" "$i.zst" ""; do + [ -z "$name" ] && echo "WARNING: missing firmware $i for module $module" + if cp -v --parents --no-preserve=mode lib/firmware/$name "$out" 2>/dev/null; then + break + fi + done + 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 |