| 1 | #!/bin/sh |
| 2 | # SPDX-License-Identifier: GPL-2.0 |
| 3 | |
| 4 | # This script generates an archive consisting of kernel headers |
| 5 | # for CONFIG_IKHEADERS. |
| 6 | set -e |
| 7 | sfile="$(readlink -f "$0")" |
| 8 | outdir="$(pwd)" |
| 9 | tarfile=$1 |
| 10 | cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir |
| 11 | |
| 12 | dir_list=" |
| 13 | include/ |
| 14 | arch/$SRCARCH/include/ |
| 15 | " |
| 16 | |
| 17 | type cpio > /dev/null |
| 18 | |
| 19 | # Support incremental builds by skipping archive generation |
| 20 | # if timestamps of files being archived are not changed. |
| 21 | |
| 22 | # This block is useful for debugging the incremental builds. |
| 23 | # Uncomment it for debugging. |
| 24 | # if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter; |
| 25 | # else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi |
| 26 | # find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter |
| 27 | |
| 28 | all_dirs= |
| 29 | if [ "$building_out_of_srctree" ]; then |
| 30 | for d in $dir_list; do |
| 31 | all_dirs="$all_dirs $srctree/$d" |
| 32 | done |
| 33 | fi |
| 34 | all_dirs="$all_dirs $dir_list" |
| 35 | |
| 36 | # include/generated/utsversion.h is ignored because it is generated after this |
| 37 | # script is executed. (utsversion.h is unneeded for kheaders) |
| 38 | # |
| 39 | # When Kconfig regenerates include/generated/autoconf.h, its timestamp is |
| 40 | # updated, but the contents might be still the same. When any CONFIG option is |
| 41 | # changed, Kconfig touches the corresponding timestamp file include/config/*. |
| 42 | # Hence, the md5sum detects the configuration change anyway. We do not need to |
| 43 | # check include/generated/autoconf.h explicitly. |
| 44 | # |
| 45 | # Ignore them for md5 calculation to avoid pointless regeneration. |
| 46 | headers_md5="$(find $all_dirs -name "*.h" | |
| 47 | grep -v "include/generated/utsversion.h" | |
| 48 | grep -v "include/generated/autoconf.h" | |
| 49 | xargs ls -l | md5sum | cut -d ' ' -f1)" |
| 50 | |
| 51 | # Any changes to this script will also cause a rebuild of the archive. |
| 52 | this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)" |
| 53 | if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi |
| 54 | if [ -f kernel/kheaders.md5 ] && |
| 55 | [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] && |
| 56 | [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] && |
| 57 | [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then |
| 58 | exit |
| 59 | fi |
| 60 | |
| 61 | echo " GEN $tarfile" |
| 62 | |
| 63 | rm -rf $cpio_dir |
| 64 | mkdir $cpio_dir |
| 65 | |
| 66 | if [ "$building_out_of_srctree" ]; then |
| 67 | ( |
| 68 | cd $srctree |
| 69 | for f in $dir_list |
| 70 | do find "$f" -name "*.h"; |
| 71 | done | cpio --quiet -pd $cpio_dir |
| 72 | ) |
| 73 | fi |
| 74 | |
| 75 | # The second CPIO can complain if files already exist which can happen with out |
| 76 | # of tree builds having stale headers in srctree. Just silence CPIO for now. |
| 77 | for f in $dir_list; |
| 78 | do find "$f" -name "*.h"; |
| 79 | done | cpio --quiet -pdu $cpio_dir >/dev/null 2>&1 |
| 80 | |
| 81 | # Remove comments except SDPX lines |
| 82 | find $cpio_dir -type f -print0 | |
| 83 | xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' |
| 84 | |
| 85 | # Create archive and try to normalize metadata for reproducibility. |
| 86 | tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \ |
| 87 | --owner=0 --group=0 --sort=name --numeric-owner \ |
| 88 | -I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null |
| 89 | |
| 90 | echo $headers_md5 > kernel/kheaders.md5 |
| 91 | echo "$this_file_md5" >> kernel/kheaders.md5 |
| 92 | echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 |
| 93 | |
| 94 | rm -rf $cpio_dir |