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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# This script generates an archive consisting of kernel headers
# for CONFIG_IKHEADERS.
set -e
tarfile=$1
srclist=$2
objlist=$3
dir=$(dirname "${tarfile}")
tmpdir=${dir}/.tmp_dir
depfile=${dir}/.$(basename "${tarfile}").d
# generate dependency list.
{
echo
echo "deps_${tarfile} := \\"
sed 's:\(.*\): \1 \\:' "${srclist}"
sed -n '/^include\/generated\/autoconf\.h$/!s:\(.*\): \1 \\:p' "${objlist}"
echo
echo "${tarfile}: \$(deps_${tarfile})"
echo
echo "\$(deps_${tarfile}):"
} > "${depfile}"
rm -rf "${tmpdir}"
mkdir "${tmpdir}"
# shellcheck disable=SC2154 # srctree is passed as an env variable
sed "s:^${srctree}/::" "${srclist}" | tar -c -f - -C "${srctree}" -T - | tar -xf - -C "${tmpdir}"
tar -c -f - -T "${objlist}" | tar -xf - -C "${tmpdir}"
# Remove comments except SDPX lines
# Use a temporary file to store directory contents to prevent find/xargs from
# seeing temporary files created by perl.
find "${tmpdir}" -type f -print0 > "${tmpdir}.contents.txt"
xargs -0 -P8 -n1 \
perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;' \
< "${tmpdir}.contents.txt"
rm -f "${tmpdir}.contents.txt"
# Create archive and try to normalize metadata for reproducibility.
tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
--owner=0 --group=0 --sort=name --numeric-owner --mode=u=rw,go=r,a+X \
-I $XZ -cf $tarfile -C "${tmpdir}/" . > /dev/null
rm -rf "${tmpdir}"
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