378177d269
Closes #302291
Closes #301536
The following things have changed:
* For 5.7+: ZSWAP compressor uses zstd now.
* For 5.11+: ZRAM compressor uses zstd now.
* For 5.13+: kernel modules are compressed with zstd instead of xz.
* For 5.19+: support zstd-compressed firmware.
The modules-closure functionality needed explicit support for copying
over `.zst` files. Also, the VM image builder used busybox's `insmod`
before which doesn't support zstd. Switched to `kmod` and added xz/zstd
as dependencies for it, similar to how it's done for the actual stage1
in d33e52b253. The use of `kmod` here
doesn't seem to be such a big deal since it's only a build-time
dependency.
100 lines
3.6 KiB
Bash
100 lines
3.6 KiB
Bash
source $stdenv/setup
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# When no modules are built, the $out/lib/modules directory will not
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# exist. Because the rest of the script assumes it does exist, we
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# handle this special case first.
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if ! test -d "$kernel/lib/modules"; then
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if test -z "$rootModules" || test -n "$allowMissing"; then
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mkdir -p "$out"
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exit 0
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else
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echo "Required modules: $rootModules"
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echo "Can not derive a closure of kernel modules because no modules were provided."
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exit 1
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fi
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fi
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version=$(cd $kernel/lib/modules && ls -d *)
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echo "kernel version is $version"
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# Determine the dependencies of each root module.
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mkdir -p $out/lib/modules/"$version"
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touch closure
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for module in $rootModules; do
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echo "root module: $module"
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modprobe --config no-config -d $kernel --set-version "$version" --show-depends "$module" \
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| while read cmd module args; do
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case "$cmd" in
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builtin)
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touch found
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echo "$module" >>closure
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echo " builtin dependency: $module";;
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insmod)
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touch found
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if ! test -e "$module"; then
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echo " dependency not found: $module"
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exit 1
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fi
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target=$(echo "$module" | sed "s^$NIX_STORE.*/lib/modules/^$out/lib/modules/^")
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if test -e "$target"; then
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echo " dependency already copied: $module"
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continue
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fi
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echo "$module" >>closure
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echo " copying dependency: $module"
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mkdir -p $(dirname $target)
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cp "$module" "$target"
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# If the kernel is compiled with coverage instrumentation, it
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# contains the paths of the *.gcda coverage data output files
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# (which it doesn't actually use...). Get rid of them to prevent
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# the whole kernel from being included in the initrd.
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nuke-refs "$target"
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echo "$target" >> $out/insmod-list;;
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*)
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echo " unexpected modprobe output: $cmd $module"
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exit 1;;
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esac
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done || test -n "$allowMissing"
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if ! test -e found; then
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echo " not found"
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if test -z "$allowMissing"; then
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exit 1
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fi
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else
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rm found
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fi
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done
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cd "$firmware"
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for module in $(< ~-/closure); do
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# for builtin modules, modinfo will reply with a wrong output looking like:
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# $ modinfo -F firmware unix
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# name: unix
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#
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# There is a pending attempt to fix this:
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# https://github.com/NixOS/nixpkgs/pull/96153
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# https://lore.kernel.org/linux-modules/20200823215433.j5gc5rnsmahpf43v@blumerang/T/#u
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#
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# For now, the workaround is just to filter out the extraneous lines out
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# of its output.
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modinfo -b $kernel --set-version "$version" -F firmware $module | grep -v '^name:' | while read -r i; do
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echo "firmware for $module: $i"
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for name in "$i" "$i.xz" "$i.zst" ""; do
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[ -z "$name" ] && echo "WARNING: missing firmware $i for module $module"
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if cp -v --parents --no-preserve=mode lib/firmware/$name "$out" 2>/dev/null; then
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break
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fi
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done
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done || :
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done
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# copy module ordering hints for depmod
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cp $kernel/lib/modules/"$version"/modules.order $out/lib/modules/"$version"/.
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cp $kernel/lib/modules/"$version"/modules.builtin $out/lib/modules/"$version"/.
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depmod -b $out -a $version
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# remove original hints from final derivation
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rm $out/lib/modules/"$version"/modules.order
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rm $out/lib/modules/"$version"/modules.builtin
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