2 # SPDX-License-Identifier: GPL-2.0
4 # This script generates an archive consisting of kernel headers
5 # for CONFIG_IKHEADERS.
7 sfile="$(readlink -f "$0")"
10 cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir
14 arch/$SRCARCH/include/
19 # Support incremental builds by skipping archive generation
20 # if timestamps of files being archived are not changed.
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
29 if [ "$building_out_of_srctree" ]; then
30 for d in $dir_list; do
31 all_dirs="$all_dirs $srctree/$d"
34 all_dirs="$all_dirs $dir_list"
36 # include/generated/utsversion.h is ignored because it is generated after this
37 # script is executed. (utsversion.h is unneeded for kheaders)
39 # When Kconfig regenerates include/generated/autoconf.h, its timestamp is
40 # updated, but the contents might be still the same. When any CONFIG option is
41 # changed, Kconfig touches the corresponding timestamp file include/config/*.
42 # Hence, the md5sum detects the configuration change anyway. We do not need to
43 # check include/generated/autoconf.h explicitly.
45 # Ignore them for md5 calculation to avoid pointless regeneration.
46 headers_md5="$(find $all_dirs -name "*.h" |
47 grep -v "include/generated/utsversion.h" |
48 grep -v "include/generated/autoconf.h" |
49 xargs ls -l | md5sum | cut -d ' ' -f1)"
51 # Any changes to this script will also cause a rebuild of the archive.
52 this_file_md5="$(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)" = "$tarfile_md5" ]; then
66 if [ "$building_out_of_srctree" ]; then
70 do find "$f" -name "*.h";
71 done | cpio --quiet -pd $cpio_dir
75 # The second CPIO can complain if files already exist which can happen with out
76 # of tree builds having stale headers in srctree. Just silence CPIO for now.
78 do find "$f" -name "*.h";
79 done | cpio --quiet -pdu $cpio_dir >/dev/null 2>&1
81 # Remove comments except SDPX lines
82 find $cpio_dir -type f -print0 |
83 xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
85 # Create archive and try to normalize metadata for reproducibility.
86 tar "${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
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