1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3 4# This script generates an archive consisting of kernel headers 5# for CONFIG_IKHEADERS. 6set -e 7sfile="$(readlink -f "$0")" 8outdir="$(pwd)" 9tarfile=$1 10cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir 11 12dir_list=" 13include/ 14arch/$SRCARCH/include/ 15" 16 17if ! command -v cpio >/dev/null; then 18 echo >&2 "***" 19 echo >&2 "*** 'cpio' could not be found." 20 echo >&2 "***" 21 exit 1 22fi 23 24# Support incremental builds by skipping archive generation 25# if timestamps of files being archived are not changed. 26 27# This block is useful for debugging the incremental builds. 28# Uncomment it for debugging. 29# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter; 30# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi 31# find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter 32 33all_dirs= 34if [ "$building_out_of_srctree" ]; then 35 for d in $dir_list; do 36 all_dirs="$all_dirs $srctree/$d" 37 done 38fi 39all_dirs="$all_dirs $dir_list" 40 41# include/generated/utsversion.h is ignored because it is generated after this 42# script is executed. (utsversion.h is unneeded for kheaders) 43# 44# When Kconfig regenerates include/generated/autoconf.h, its timestamp is 45# updated, but the contents might be still the same. When any CONFIG option is 46# changed, Kconfig touches the corresponding timestamp file include/config/*. 47# Hence, the md5sum detects the configuration change anyway. We do not need to 48# check include/generated/autoconf.h explicitly. 49# 50# Ignore them for md5 calculation to avoid pointless regeneration. 51headers_md5="$(find $all_dirs -name "*.h" | 52 grep -v "include/generated/utsversion.h" | 53 grep -v "include/generated/autoconf.h" | 54 xargs ls -l | md5sum | cut -d ' ' -f1)" 55 56# Any changes to this script will also cause a rebuild of the archive. 57this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)" 58if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi 59if [ -f kernel/kheaders.md5 ] && 60 [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] && 61 [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] && 62 [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then 63 exit 64fi 65 66echo " GEN $tarfile" 67 68rm -rf $cpio_dir 69mkdir $cpio_dir 70 71if [ "$building_out_of_srctree" ]; then 72 ( 73 cd $srctree 74 for f in $dir_list 75 do find "$f" -name "*.h"; 76 done | cpio --quiet -pd $cpio_dir 77 ) 78fi 79 80# The second CPIO can complain if files already exist which can happen with out 81# of tree builds having stale headers in srctree. Just silence CPIO for now. 82for f in $dir_list; 83 do find "$f" -name "*.h"; 84done | cpio --quiet -pdu $cpio_dir >/dev/null 2>&1 85 86# Remove comments except SDPX lines 87find $cpio_dir -type f -print0 | 88 xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' 89 90# Create archive and try to normalize metadata for reproducibility. 91tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \ 92 --owner=0 --group=0 --sort=name --numeric-owner \ 93 -I $XZ -cf $tarfile -C $cpio_dir/ . > /dev/null 94 95echo $headers_md5 > kernel/kheaders.md5 96echo "$this_file_md5" >> kernel/kheaders.md5 97echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 98 99rm -rf $cpio_dir 100