1#!/bin/bash 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/$tarfile.tmp 11 12dir_list=" 13include/ 14arch/$SRCARCH/include/ 15" 16 17# Support incremental builds by skipping archive generation 18# if timestamps of files being archived are not changed. 19 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 $src_file_list -name "*.h" | xargs ls -l > /tmp/src-ls-$iter 25# find $obj_file_list -name "*.h" | xargs ls -l > /tmp/obj-ls-$iter 26 27# include/generated/compile.h is ignored because it is touched even when none 28# of the source files changed. This causes pointless regeneration, so let us 29# ignore them for md5 calculation. 30pushd $srctree > /dev/null 31src_files_md5="$(find $dir_list -name "*.h" | 32 grep -v "include/generated/compile.h" | 33 grep -v "include/generated/autoconf.h" | 34 xargs ls -l | md5sum | cut -d ' ' -f1)" 35popd > /dev/null 36obj_files_md5="$(find $dir_list -name "*.h" | 37 grep -v "include/generated/compile.h" | 38 grep -v "include/generated/autoconf.h" | 39 xargs ls -l | md5sum | cut -d ' ' -f1)" 40# Any changes to this script will also cause a rebuild of the archive. 41this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)" 42if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi 43if [ -f kernel/kheaders.md5 ] && 44 [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] && 45 [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] && 46 [ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] && 47 [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then 48 exit 49fi 50 51if [ "${quiet}" != "silent_" ]; then 52 echo " GEN $tarfile" 53fi 54 55rm -rf $cpio_dir 56mkdir $cpio_dir 57 58pushd $srctree > /dev/null 59for f in $dir_list; 60 do find "$f" -name "*.h"; 61done | cpio --quiet -pd $cpio_dir 62popd > /dev/null 63 64# The second CPIO can complain if files already exist which can 65# happen with out of tree builds. Just silence CPIO for now. 66for f in $dir_list; 67 do find "$f" -name "*.h"; 68done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1 69 70# Remove comments except SDPX lines 71find $cpio_dir -type f -print0 | 72 xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' 73 74# Create archive and try to normalize metadata for reproducibility. 75# For compatibility with older versions of tar, files are fed to tar 76# pre-sorted, as --sort=name might not be available. 77find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \ 78 tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \ 79 --owner=0 --group=0 --numeric-owner --no-recursion \ 80 -Jcf $tarfile -C $cpio_dir/ -T - > /dev/null 81 82echo "$src_files_md5" > kernel/kheaders.md5 83echo "$obj_files_md5" >> kernel/kheaders.md5 84echo "$this_file_md5" >> kernel/kheaders.md5 85echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 86 87rm -rf $cpio_dir 88