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 $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter 25 26all_dirs= 27if [ "$building_out_of_srctree" ]; then 28 for d in $dir_list; do 29 all_dirs="$all_dirs $srctree/$d" 30 done 31fi 32all_dirs="$all_dirs $dir_list" 33 34# include/generated/compile.h is ignored because it is touched even when none 35# of the source files changed. This causes pointless regeneration, so let us 36# ignore them for md5 calculation. 37headers_md5="$(find $all_dirs -name "*.h" | 38 grep -v "include/generated/compile.h" | 39 grep -v "include/generated/autoconf.h" | 40 xargs ls -l | md5sum | cut -d ' ' -f1)" 41 42# Any changes to this script will also cause a rebuild of the archive. 43this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)" 44if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi 45if [ -f kernel/kheaders.md5 ] && 46 [ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] && 47 [ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] && 48 [ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then 49 exit 50fi 51 52if [ "${quiet}" != "silent_" ]; then 53 echo " GEN $tarfile" 54fi 55 56rm -rf $cpio_dir 57mkdir $cpio_dir 58 59if [ "$building_out_of_srctree" ]; then 60 pushd $srctree > /dev/null 61 for f in $dir_list 62 do find "$f" -name "*.h"; 63 done | cpio --quiet -pd $cpio_dir 64 popd > /dev/null 65fi 66 67# The second CPIO can complain if files already exist which can happen with out 68# of tree builds having stale headers in srctree. Just silence CPIO for now. 69for f in $dir_list; 70 do find "$f" -name "*.h"; 71done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1 72 73# Remove comments except SDPX lines 74find $cpio_dir -type f -print0 | 75 xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' 76 77# Create archive and try to normalize metadata for reproducibility. 78# For compatibility with older versions of tar, files are fed to tar 79# pre-sorted, as --sort=name might not be available. 80find $cpio_dir -printf "./%P\n" | LC_ALL=C sort | \ 81 tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \ 82 --owner=0 --group=0 --numeric-owner --no-recursion \ 83 -Jcf $tarfile -C $cpio_dir/ -T - > /dev/null 84 85echo $headers_md5 > kernel/kheaders.md5 86echo "$this_file_md5" >> kernel/kheaders.md5 87echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 88 89rm -rf $cpio_dir 90