kernel/gen_ikh_data.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 # This script generates an archive consisting of kernel headers
   5 # for CONFIG_IKHEADERS_PROC.
   6 set -e
   7 spath="$(dirname "$(readlink -f "$0")")"
   8 kroot="$spath/.."
   9 outdir="$(pwd)"
  10 tarfile=$1
  11 cpio_dir=$outdir/$tarfile.tmp
  12
  13 # Script filename relative to the kernel source root
  14 # We add it to the archive because it is small and any changes
  15 # to this script will also cause a rebuild of the archive.
  16 sfile="$(realpath --relative-to $kroot "$(readlink -f "$0")")"
  17
  18 src_file_list="
  19 include/
  20 arch/$SRCARCH/include/
  21 $sfile
  22 "
  23
  24 obj_file_list="
  25 include/
  26 arch/$SRCARCH/include/
  27 "
  28
  29 # Support incremental builds by skipping archive generation
  30 # if timestamps of files being archived are not changed.
  31
  32 # This block is useful for debugging the incremental builds.
  33 # Uncomment it for debugging.
  34 # iter=1
  35 # if [ ! -f /tmp/iter ]; then echo 1 > /tmp/iter;
  36 # else;         iter=$(($(cat /tmp/iter) + 1)); fi
  37 # find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter
  38 # find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$iter
  39
  40 # include/generated/compile.h is ignored because it is touched even when none
  41 # of the source files changed. This causes pointless regeneration, so let us
  42 # ignore them for md5 calculation.
  43 pushd $kroot > /dev/null
  44 src_files_md5="$(find $src_file_list -type f                       |
  45                 grep -v "include/generated/compile.h"              |
  46                 xargs ls -lR | md5sum | cut -d ' ' -f1)"
  47 popd > /dev/null
  48 obj_files_md5="$(find $obj_file_list -type f                       |
  49                 grep -v "include/generated/compile.h"              |
  50                 xargs ls -lR | md5sum | cut -d ' ' -f1)"
  51
  52 if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
  53 if [ -f kernel/kheaders.md5 ] &&
  54         [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&
  55         [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&
  56         [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then
  57                 exit
  58 fi
  59
  60 if [ "${quiet}" != "silent_" ]; then
  61        echo "  GEN     $tarfile"
  62 fi
  63
  64 rm -rf $cpio_dir
  65 mkdir $cpio_dir
  66
  67 pushd $kroot > /dev/null
  68 for f in $src_file_list;
  69         do find "$f" ! -name "*.cmd" ! -name ".*";
  70 done | cpio --quiet -pd $cpio_dir
  71 popd > /dev/null
  72
  73 # The second CPIO can complain if files already exist which can
  74 # happen with out of tree builds. Just silence CPIO for now.
  75 for f in $obj_file_list;
  76         do find "$f" ! -name "*.cmd" ! -name ".*";
  77 done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
  78
  79 # Remove comments except SDPX lines
  80 find $cpio_dir -type f -print0 |
  81         xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
  82
  83 tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
  84
  85 echo "$src_files_md5" > kernel/kheaders.md5
  86 echo "$obj_files_md5" >> kernel/kheaders.md5
  87 echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
  88
  89 rm -rf $cpio_dir