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 7spath="$(dirname "$(readlink -f "$0")")" 8kroot="$spath/.." 9outdir="$(pwd)" 10tarfile=$1 11cpio_dir=$outdir/$tarfile.tmp 12 13# Script filename relative to the kernel source root 14# We add it to the archive because it is small and any changes 15# to this script will also cause a rebuild of the archive. 16sfile="$(realpath --relative-to $kroot "$(readlink -f "$0")")" 17 18src_file_list=" 19include/ 20arch/$SRCARCH/include/ 21$sfile 22" 23 24obj_file_list=" 25include/ 26arch/$SRCARCH/include/ 27" 28 29# Support incremental builds by skipping archive generation 30# if timestamps of files being archived are not changed. 31 32# This block is useful for debugging the incremental builds. 33# Uncomment it for debugging. 34# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter; 35# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi 36# find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter 37# find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$iter 38 39# include/generated/compile.h is ignored because it is touched even when none 40# of the source files changed. This causes pointless regeneration, so let us 41# ignore them for md5 calculation. 42pushd $kroot > /dev/null 43src_files_md5="$(find $src_file_list -type f | 44 grep -v "include/generated/compile.h" | 45 grep -v "include/generated/autoconf.h" | 46 grep -v "include/config/auto.conf" | 47 grep -v "include/config/auto.conf.cmd" | 48 grep -v "include/config/tristate.conf" | 49 xargs ls -lR | md5sum | cut -d ' ' -f1)" 50popd > /dev/null 51obj_files_md5="$(find $obj_file_list -type f | 52 grep -v "include/generated/compile.h" | 53 grep -v "include/generated/autoconf.h" | 54 grep -v "include/config/auto.conf" | 55 grep -v "include/config/auto.conf.cmd" | 56 grep -v "include/config/tristate.conf" | 57 xargs ls -lR | md5sum | cut -d ' ' -f1)" 58 59if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi 60if [ -f kernel/kheaders.md5 ] && 61 [ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] && 62 [ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] && 63 [ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then 64 exit 65fi 66 67if [ "${quiet}" != "silent_" ]; then 68 echo " GEN $tarfile" 69fi 70 71rm -rf $cpio_dir 72mkdir $cpio_dir 73 74pushd $kroot > /dev/null 75for f in $src_file_list; 76 do find "$f" ! -name "*.cmd" ! -name ".*"; 77done | cpio --quiet -pd $cpio_dir 78popd > /dev/null 79 80# The second CPIO can complain if files already exist which can 81# happen with out of tree builds. Just silence CPIO for now. 82for f in $obj_file_list; 83 do find "$f" ! -name "*.cmd" ! -name ".*"; 84done | cpio --quiet -pd $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 90tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null 91 92echo "$src_files_md5" > kernel/kheaders.md5 93echo "$obj_files_md5" >> kernel/kheaders.md5 94echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5 95 96rm -rf $cpio_dir 97