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86cdd2fdc4
In commit43d8ce9d65("Provide in-kernel headers to make extending kernel easier") a new mechanism was introduced, for kernels >=5.2, which embeds the kernel headers in the kernel image or a module and exposes them in procfs for use by userland tools. The archive containing the header files has nondeterminism caused by header files metadata. This patch normalizes the metadata and utilizes KBUILD_BUILD_TIMESTAMP if provided and otherwise falls back to the default behaviour. In commitf7b101d330("kheaders: Move from proc to sysfs") it was modified to use sysfs and the script for generation of the archive was renamed to what is being patched. Signed-off-by: Dmitry Goldin <dgoldin+lkml@protonmail.ch> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
85 lines
2.9 KiB
Bash
Executable File
85 lines
2.9 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: GPL-2.0
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# This script generates an archive consisting of kernel headers
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# for CONFIG_IKHEADERS.
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set -e
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sfile="$(readlink -f "$0")"
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outdir="$(pwd)"
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tarfile=$1
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cpio_dir=$outdir/$tarfile.tmp
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dir_list="
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include/
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arch/$SRCARCH/include/
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"
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# Support incremental builds by skipping archive generation
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# if timestamps of files being archived are not changed.
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# This block is useful for debugging the incremental builds.
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# Uncomment it for debugging.
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# if [ ! -f /tmp/iter ]; then iter=1; echo 1 > /tmp/iter;
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# else iter=$(($(cat /tmp/iter) + 1)); echo $iter > /tmp/iter; fi
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# find $src_file_list -name "*.h" | xargs ls -l > /tmp/src-ls-$iter
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# find $obj_file_list -name "*.h" | xargs ls -l > /tmp/obj-ls-$iter
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# include/generated/compile.h is ignored because it is touched even when none
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# of the source files changed. This causes pointless regeneration, so let us
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# ignore them for md5 calculation.
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pushd $srctree > /dev/null
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src_files_md5="$(find $dir_list -name "*.h" |
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grep -v "include/generated/compile.h" |
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grep -v "include/generated/autoconf.h" |
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xargs ls -l | md5sum | cut -d ' ' -f1)"
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popd > /dev/null
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obj_files_md5="$(find $dir_list -name "*.h" |
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grep -v "include/generated/compile.h" |
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grep -v "include/generated/autoconf.h" |
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xargs ls -l | md5sum | cut -d ' ' -f1)"
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# Any changes to this script will also cause a rebuild of the archive.
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this_file_md5="$(ls -l $sfile | md5sum | cut -d ' ' -f1)"
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if [ -f $tarfile ]; then tarfile_md5="$(md5sum $tarfile | cut -d ' ' -f1)"; fi
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if [ -f kernel/kheaders.md5 ] &&
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[ "$(cat kernel/kheaders.md5|head -1)" == "$src_files_md5" ] &&
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[ "$(cat kernel/kheaders.md5|head -2|tail -1)" == "$obj_files_md5" ] &&
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[ "$(cat kernel/kheaders.md5|head -3|tail -1)" == "$this_file_md5" ] &&
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[ "$(cat kernel/kheaders.md5|tail -1)" == "$tarfile_md5" ]; then
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exit
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fi
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if [ "${quiet}" != "silent_" ]; then
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echo " GEN $tarfile"
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fi
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rm -rf $cpio_dir
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mkdir $cpio_dir
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pushd $srctree > /dev/null
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for f in $dir_list;
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do find "$f" -name "*.h";
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done | cpio --quiet -pd $cpio_dir
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popd > /dev/null
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# The second CPIO can complain if files already exist which can
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# happen with out of tree builds. Just silence CPIO for now.
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for f in $dir_list;
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do find "$f" -name "*.h";
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done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
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# Remove comments except SDPX lines
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find $cpio_dir -type f -print0 |
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xargs -0 -P8 -n1 perl -pi -e 'BEGIN {undef $/;}; s/\/\*((?!SPDX).)*?\*\///smg;'
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# Create archive and try to normalize metadata for reproducibility
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tar "${KBUILD_BUILD_TIMESTAMP:+--mtime=$KBUILD_BUILD_TIMESTAMP}" \
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--owner=0 --group=0 --sort=name --numeric-owner \
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-Jcf $tarfile -C $cpio_dir/ . > /dev/null
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echo "$src_files_md5" > kernel/kheaders.md5
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echo "$obj_files_md5" >> kernel/kheaders.md5
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echo "$this_file_md5" >> kernel/kheaders.md5
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echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
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rm -rf $cpio_dir
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