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- #!/bin/sh
- # SPDX-License-Identifier: GPL-2.0
- # This script generates an archive consisting of kernel headers
- # for CONFIG_IKHEADERS.
- set -e
- sfile="$(readlink -f "$0")"
- outdir="$(pwd)"
- tarfile=$1
- cpio_dir=$outdir/$tarfile.tmp
- dir_list="
- include/
- arch/$SRCARCH/include/
- "
- # Support incremental builds by skipping archive generation
- # if timestamps of files being archived are not changed.
- # This block is useful for debugging the incremental builds.
- # Uncomment it for debugging.
- # if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
- # else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
- # find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter
- all_dirs=
- if [ "$building_out_of_srctree" ]; then
- for d in $dir_list; do
- all_dirs="$all_dirs $srctree/$d"
- done
- fi
- all_dirs="$all_dirs $dir_list"
- # include/generated/utsversion.h is ignored because it is generated after this
- # script is executed. (utsversion.h is unneeded for kheaders)
- #
- # When Kconfig regenerates include/generated/autoconf.h, its timestamp is
- # updated, but the contents might be still the same. When any CONFIG option is
- # changed, Kconfig touches the corresponding timestamp file include/config/*.
- # Hence, the md5sum detects the configuration change anyway. We do not need to
- # check include/generated/autoconf.h explicitly.
- #
- # Ignore them for md5 calculation to avoid pointless regeneration.
- headers_md5="$(find $all_dirs -name "*.h" |
- grep -v "include/generated/utsversion.h" |
- grep -v "include/generated/autoconf.h" |
- xargs ls -l | md5sum | cut -d ' ' -f1)"
- # Any changes to this script will also cause a rebuild of the archive.
- this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
- if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
- if [ -f kernel/kheaders.md5 ] &&
- [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&
- [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
- [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
- exit
- fi
- echo " GEN $tarfile"
- rm -rf $cpio_dir
- mkdir $cpio_dir
- if [ "$building_out_of_srctree" ]; then
- (
- cd $srctree
- for f in $dir_list
- do find "$f" -name "*.h";
- done | cpio --quiet -L -pd $cpio_dir
- )
- fi
- # The second CPIO can complain if files already exist which can happen with out
- # of tree builds having stale headers in srctree. Just silence CPIO for now.
- for f in $dir_list;
- do find "$f" -name "*.h";
- done | cpio --quiet -L -pdu $cpio_dir >/dev/null 2>&1
- # Remove comments except SDPX lines
- find $cpio_dir -type f -print0 |
- xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
- # Create archive and try to normalize metadata for reproducibility.
- # For compatibility with older versions of tar, files are fed to tar
- # pre-sorted, as --sort=name might not be available.
- find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \
- tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
- --owner=0 --group=0 --numeric-owner --no-recursion \
- -I $XZ -cf $tarfile -C $cpio_dir/ -T - > /dev/null
- echo $headers_md5 > kernel/kheaders.md5
- echo "$this_file_md5" >> kernel/kheaders.md5
- echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
- rm -rf $cpio_dir
|