mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
synced 2025-01-15 02:05:33 +00:00
41e86fe7eb
CONFIG_IKHEADERS has a reproducibility issue because the contents of kernel/kheaders_data.tar.xz can vary depending on how you build the kernel. If you build the kernel with CONFIG_IKHEADERS enabled from a pristine state, the tarball does not include include/generated/utsversion.h. $ make -s mrproper $ make -s defconfig $ scripts/config -e CONFIG_IKHEADERS $ make -s $ tar Jtf kernel/kheaders_data.tar.xz | grep utsversion However, if you build the kernel with CONFIG_IKHEADERS disabled first and then enable it later, the tarball does include include/generated/utsversion.h. $ make -s mrproper $ make -s defconfig $ make -s $ scripts/config -e CONFIG_IKHEADERS $ make -s $ tar Jtf kernel/kheaders_data.tar.xz | grep utsversion ./include/generated/utsversion.h It is not predictable whether a stale include/generated/utsversion.h remains when kheaders_data.tar.xz is generated. For better reproducibility, include/generated/utsversions.h should always be omitted. It is not necessary for the kheaders anyway. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
104 lines
3.3 KiB
Bash
Executable File
104 lines
3.3 KiB
Bash
Executable File
#!/bin/sh
|
|
# SPDX-License-Identifier: GPL-2.0
|
|
|
|
# This script generates an archive consisting of kernel headers
|
|
# for CONFIG_IKHEADERS.
|
|
set -e
|
|
sfile="$(readlink -f "$0")"
|
|
outdir="$(pwd)"
|
|
tarfile=$1
|
|
cpio_dir=$outdir/${tarfile%/*}/.tmp_cpio_dir
|
|
|
|
dir_list="
|
|
include/
|
|
arch/$SRCARCH/include/
|
|
"
|
|
|
|
if ! command -v cpio >/dev/null; then
|
|
echo >&2 "***"
|
|
echo >&2 "*** 'cpio' could not be found."
|
|
echo >&2 "***"
|
|
exit 1
|
|
fi
|
|
|
|
# Support incremental builds by skipping archive generation
|
|
# if timestamps of files being archived are not changed.
|
|
|
|
# This block is useful for debugging the incremental builds.
|
|
# Uncomment it for debugging.
|
|
# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
|
|
# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
|
|
# find $all_dirs -name "*.h" | xargs ls -l > /tmp/ls-$iter
|
|
|
|
all_dirs=
|
|
if [ "$building_out_of_srctree" ]; then
|
|
for d in $dir_list; do
|
|
all_dirs="$all_dirs $srctree/$d"
|
|
done
|
|
fi
|
|
all_dirs="$all_dirs $dir_list"
|
|
|
|
# include/generated/utsversion.h is ignored because it is generated after this
|
|
# script is executed. (utsversion.h is unneeded for kheaders)
|
|
#
|
|
# When Kconfig regenerates include/generated/autoconf.h, its timestamp is
|
|
# updated, but the contents might be still the same. When any CONFIG option is
|
|
# changed, Kconfig touches the corresponding timestamp file include/config/*.
|
|
# Hence, the md5sum detects the configuration change anyway. We do not need to
|
|
# check include/generated/autoconf.h explicitly.
|
|
#
|
|
# Ignore them for md5 calculation to avoid pointless regeneration.
|
|
headers_md5="$(find $all_dirs -name "*.h" |
|
|
grep -v "include/generated/utsversion.h" |
|
|
grep -v "include/generated/autoconf.h" |
|
|
xargs ls -l | md5sum | cut -d ' ' -f1)"
|
|
|
|
# Any changes to this script will also cause a rebuild of the archive.
|
|
this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
|
|
if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
|
|
if [ -f kernel/kheaders.md5 ] &&
|
|
[ "$(head -n 1 kernel/kheaders.md5)" = "$headers_md5" ] &&
|
|
[ "$(head -n 2 kernel/kheaders.md5 | tail -n 1)" = "$this_file_md5" ] &&
|
|
[ "$(tail -n 1 kernel/kheaders.md5)" = "$tarfile_md5" ]; then
|
|
exit
|
|
fi
|
|
|
|
echo " GEN $tarfile"
|
|
|
|
rm -rf $cpio_dir
|
|
mkdir $cpio_dir
|
|
|
|
if [ "$building_out_of_srctree" ]; then
|
|
(
|
|
cd $srctree
|
|
for f in $dir_list
|
|
do find "$f" -name "*.h";
|
|
done | cpio --quiet -pd $cpio_dir
|
|
)
|
|
fi
|
|
|
|
# The second CPIO can complain if files already exist which can happen with out
|
|
# of tree builds having stale headers in srctree. Just silence CPIO for now.
|
|
for f in $dir_list;
|
|
do find "$f" -name "*.h";
|
|
done | cpio --quiet -pdu $cpio_dir >/dev/null 2>&1
|
|
|
|
# Always exclude include/generated/utsversion.h
|
|
# Otherwise, the contents of the tarball may vary depending on the build steps.
|
|
rm -f "${cpio_dir}/include/generated/utsversion.h"
|
|
|
|
# Remove comments except SDPX lines
|
|
find $cpio_dir -type f -print0 |
|
|
xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
|
|
|
|
# Create archive and try to normalize metadata for reproducibility.
|
|
tar "${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 $cpio_dir/ . > /dev/null
|
|
|
|
echo $headers_md5 > kernel/kheaders.md5
|
|
echo "$this_file_md5" >> kernel/kheaders.md5
|
|
echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
|
|
|
|
rm -rf $cpio_dir
|