#!/bin/bash# 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=$1cpio_dir=$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 $src_file_list -name "*.h" | xargs ls -l > /tmp/src-ls-$iter# find $obj_file_list -name "*.h" | xargs ls -l > /tmp/obj-ls-$iter # include/generated/compile.h is ignored because it is touched even when none# of the source files changed. This causes pointless regeneration, so let us# ignore them for md5 calculation.pushd $srctree > /dev/nullsrc_files_md5="$(find $dir_list -name "*.h"			   |		grep -v "include/generated/compile.h"		   |		grep -v "include/generated/autoconf.h"		   |		xargs ls -l | md5sum | cut -d ' ' -f1)"popd > /dev/nullobj_files_md5="$(find $dir_list -name "*.h"			   |		grep -v "include/generated/compile.h"		   |		grep -v "include/generated/autoconf.h"		   |		xargs ls -l | md5sum | cut -d ' ' -f1)"# Any changes to this script will also cause a rebuild of the archive.this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fiif [ -f kernel/kheaders.md5 ] &&	[ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&	[ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&	[ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] &&	[ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then		exitfi if [ "${quiet}" != "silent_" ]; then       echo "  GEN     $tarfile"fi rm -rf $cpio_dirmkdir $cpio_dir pushd $srctree > /dev/nullfor f in $dir_list;	do find "$f" -name "*.h";done | cpio --quiet -pd $cpio_dirpopd > /dev/null # The second CPIO can complain if files already exist which can# happen with out of tree builds. Just silence CPIO for now.for f in $dir_list;	do find "$f" -name "*.h";done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1 # Remove comments except SDPX linesfind $cpio_dir -type f -print0 |	xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null echo "$src_files_md5" >  kernel/kheaders.md5echo "$obj_files_md5" >> kernel/kheaders.md5echo "$this_file_md5" >> kernel/kheaders.md5echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 rm -rf $cpio_dir