f7b101d330
The kheaders archive consisting of the kernel headers used for compiling bpf programs is in /proc. However there is concern that moving it here will make it permanent. Let us move it to /sys/kernel as discussed [1]. [1] https://lore.kernel.org/patchwork/patch/1067310/#1265969 Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
90 lines
2.7 KiB
Bash
Executable File
90 lines
2.7 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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spath="$(dirname "$(readlink -f "$0")")"
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kroot="$spath/.."
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outdir="$(pwd)"
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tarfile=$1
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cpio_dir=$outdir/$tarfile.tmp
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# Script filename relative to the kernel source root
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# We add it to the archive because it is small and any changes
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# to this script will also cause a rebuild of the archive.
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sfile="$(realpath --relative-to $kroot "$(readlink -f "$0")")"
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src_file_list="
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include/
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arch/$SRCARCH/include/
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$sfile
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"
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obj_file_list="
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include/
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arch/$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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# iter=1
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# if [ ! -f /tmp/iter ]; then echo 1 > /tmp/iter;
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# else; iter=$(($(cat /tmp/iter) + 1)); fi
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# find $src_file_list -type f | xargs ls -lR > /tmp/src-ls-$iter
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# find $obj_file_list -type f | xargs ls -lR > /tmp/obj-ls-$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 $kroot > /dev/null
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src_files_md5="$(find $src_file_list -type f |
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grep -v "include/generated/compile.h" |
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xargs ls -lR | md5sum | cut -d ' ' -f1)"
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popd > /dev/null
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obj_files_md5="$(find $obj_file_list -type f |
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grep -v "include/generated/compile.h" |
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xargs ls -lR | 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|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 $kroot > /dev/null
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for f in $src_file_list;
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do find "$f" ! -name "*.cmd" ! -name ".*";
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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 $obj_file_list;
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do find "$f" ! -name "*.cmd" ! -name ".*";
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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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tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
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echo "$src_files_md5" > kernel/kheaders.md5
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echo "$obj_files_md5" >> kernel/kheaders.md5
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echo "$(md5sum $tarfile | cut -d ' ' -f1)" >> kernel/kheaders.md5
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rm -rf $cpio_dir
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