pkgs/build-support/kernel/modules-closure.sh

   1 source $stdenv/setup
   2
   3 # When no modules are built, the $out/lib/modules directory will not
   4 # exist. Because the rest of the script assumes it does exist, we
   5 # handle this special case first.
   6 if ! test -d "$kernel/lib/modules"; then
   7     if test -z "$rootModules" || test -n "$allowMissing"; then
   8         mkdir -p "$out"
   9         exit 0
  10     else
  11         echo "Required modules: $rootModules"
  12         echo "Can not derive a closure of kernel modules because no modules were provided."
  13         exit 1
  14     fi
  15 fi
  16
  17 version=$(cd $kernel/lib/modules && ls -d *)
  18
  19 echo "kernel version is $version"
  20
  21 # Determine the dependencies of each root module.
  22 mkdir -p $out/lib/modules/"$version"
  23 touch closure
  24 for module in $rootModules; do
  25     echo "root module: $module"
  26     modprobe --config no-config -d $kernel --set-version "$version" --show-depends "$module" \
  27     | while read cmd module args; do
  28         case "$cmd" in
  29             builtin)
  30                 touch found
  31                 echo "$module" >>closure
  32                 echo "  builtin dependency: $module";;
  33             insmod)
  34                 touch found
  35                 if ! test -e "$module"; then
  36                     echo "  dependency not found: $module"
  37                     exit 1
  38                 fi
  39                 target=$(echo "$module" | sed "s^$NIX_STORE.*/lib/modules/^$out/lib/modules/^")
  40                 if test -e "$target"; then
  41                     echo "  dependency already copied: $module"
  42                     continue
  43                 fi
  44                 echo "$module" >>closure
  45                 echo "  copying dependency: $module"
  46                 mkdir -p $(dirname $target)
  47                 cp "$module" "$target"
  48                 # If the kernel is compiled with coverage instrumentation, it
  49                 # contains the paths of the *.gcda coverage data output files
  50                 # (which it doesn't actually use...).  Get rid of them to prevent
  51                 # the whole kernel from being included in the initrd.
  52                 nuke-refs "$target"
  53                 echo "$target" >> $out/insmod-list;;
  54              *)
  55                 echo "  unexpected modprobe output: $cmd $module"
  56                 exit 1;;
  57         esac
  58     done || test -n "$allowMissing"
  59     if ! test -e found; then
  60         echo "  not found"
  61         if test -z "$allowMissing"; then
  62             exit 1
  63         fi
  64     else
  65         rm found
  66     fi
  67 done
  68
  69 cd "$firmware"
  70 for module in $(< ~-/closure); do
  71     # for builtin modules, modinfo will reply with a wrong output looking like:
  72     #   $ modinfo -F firmware unix
  73     #   name:           unix
  74     #
  75     # There is a pending attempt to fix this:
  76     #   https://github.com/NixOS/nixpkgs/pull/96153
  77     #   https://lore.kernel.org/linux-modules/20200823215433.j5gc5rnsmahpf43v@blumerang/T/#u
  78     #
  79     # For now, the workaround is just to filter out the extraneous lines out
  80     # of its output.
  81     modinfo -b $kernel --set-version "$version" -F firmware $module | grep -v '^name:' | while read -r i; do
  82         echo "firmware for $module: $i"
  83         for name in "$i" "$i.xz" "$i.zst" ""; do
  84             [ -z "$name" ] && echo "WARNING: missing firmware $i for module $module"
  85             if cp -v --parents --no-preserve=mode lib/firmware/$name "$out" 2>/dev/null; then
  86                 break
  87             fi
  88         done
  89     done || :
  90 done
  91
  92 if test -e lib/firmware/edid ; then
  93     echo "lib/firmware/edid found, copying."
  94     mkdir -p "$out/lib/firmware"
  95     cp -v --no-preserve=mode --recursive --dereference --no-target-directory lib/firmware/edid "$out/lib/firmware/edid"
  96 else
  97     echo "lib/firmware/edid not found, skipping."
  98 fi
  99
 100 # copy module ordering hints for depmod
 101 cp $kernel/lib/modules/"$version"/modules.order $out/lib/modules/"$version"/.
 102 cp $kernel/lib/modules/"$version"/modules.builtin $out/lib/modules/"$version"/.
 103
 104 depmod -b $out -a $version
 105
 106 # remove original hints from final derivation
 107 rm $out/lib/modules/"$version"/modules.order
 108 rm $out/lib/modules/"$version"/modules.builtin