#!/bin/sh# SPDX-License-Identifier: GPL-2.0 # This script generates an archive consisting of kernel headers# for CONFIG_IKHEADERS.set -esfile="$(readlink -f "$0")"outdir="$(pwd)"tarfile=$1tmpdir=$outdir/${tarfile%/*}/.tmp_dir dir_list="include/arch/$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"	donefiall_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 $all_dirs -name "*.h" -a			\		! -path include/generated/utsversion.h -a	\		! -path include/generated/autoconf.h		|		xargs ls -l | md5sum | cut -d ' ' -f1)" # Any changes to this script will also cause a rebuild of the archive.this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fiif [ -f kernel/kheaders.md5 ] &&	[ "$(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		exitfi echo "  GEN     $tarfile" rm -rf "${tmpdir}"mkdir "${tmpdir}" if [ "$building_out_of_srctree" ]; then	(		cd $srctree		for f in $dir_list			do find "$f" -name "*.h";		done | tar -c -f - -T - | tar -xf - -C "${tmpdir}"	)fi for f in $dir_list;	do find "$f" -name "*.h";done | tar -c -f - -T - | tar -xf - -C "${tmpdir}" # Always exclude include/generated/utsversion.h# Otherwise, the contents of the tarball may vary depending on the build steps.rm -f "${tmpdir}/include/generated/utsversion.h" # Remove comments except SDPX lines# Use a temporary file to store directory contents to prevent find/xargs from# seeing temporary files created by perl.find "${tmpdir}" -type f -print0 > "${tmpdir}.contents.txt"xargs -0 -P8 -n1 \	perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' \	< "${tmpdir}.contents.txt"rm -f "${tmpdir}.contents.txt" # Create archive and try to normalize metadata for reproducibility.tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \    --exclude=".__afs*" --exclude=".nfs*" \    --owner=0 --group=0 --sort=name --numeric-owner --mode=u=rw,go=r,a+X \    -I $XZ -cf $tarfile -C "${tmpdir}/" . > /dev/null echo $headers_md5 > kernel/kheaders.md5echo "$this_file_md5" >> kernel/kheaders.md5echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 rm -rf "${tmpdir}"