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/$tarfile.tmp
14 arch/$SRCARCH/include/
17 # Support incremental builds by skipping archive generation
18 # if timestamps of files being archived are not changed.
20 # This block is useful for debugging the incremental builds.
21 # Uncomment it for debugging.
22 # if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
23 # else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
24 # find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter
27 if [ "$building_out_of_srctree" ]; then
28 for d in $dir_list; do
29 all_dirs="$all_dirs $srctree/$d"
32 all_dirs="$all_dirs $dir_list"
34 # include/generated/compile.h is ignored because it is touched even when none
35 # of the source files changed.
37 # When Kconfig regenerates include/generated/autoconf.h, its timestamp is
38 # updated, but the contents might be still the same. When any CONFIG option is
39 # changed, Kconfig touches the corresponding timestamp file include/config/*.
40 # Hence, the md5sum detects the configuration change anyway. We do not need to
41 # check include/generated/autoconf.h explicitly.
43 # Ignore them for md5 calculation to avoid pointless regeneration.
44 headers_md5="$(find $all_dirs -name "*.h" |
45 grep -v "include/generated/compile.h" |
46 grep -v "include/generated/autoconf.h" |
47 xargs ls -l | md5sum | cut -d ' ' -f1)"
49 # Any changes to this script will also cause a rebuild of the archive.
50 this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
51 if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
52 if [ -f kernel/kheaders.md5 ] &&
53 [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&
54 [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
55 [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
64 if [ "$building_out_of_srctree" ]; then
68 do find "$f" -name "*.h";
69 done | cpio --quiet -pd $cpio_dir
73 # The second CPIO can complain if files already exist which can happen with out
74 # of tree builds having stale headers in srctree. Just silence CPIO for now.
76 do find "$f" -name "*.h";
77 done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
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;'
83 # Create archive and try to normalize metadata for reproducibility.
84 # For compatibility with older versions of tar, files are fed to tar
85 # pre-sorted, as --sort=name might not be available.
86 find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
87 tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
88 --owner=0 --group=0 --numeric-owner --no-recursion \
89 -I $XZ -cf $tarfile -C $cpio_dir/ -T - > /dev/null
91 echo $headers_md5 > kernel/kheaders.md5
92 echo "$this_file_md5" >> kernel/kheaders.md5
93 echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5