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kheaders: exclude include/generated/utsversion.h from kheaders_data.tar.xz

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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>
This commit is contained in:
Masahiro Yamada 2024-12-18 19:37:05 +09:00
parent 1f937a4bcb
commit 41e86fe7eb
1 changed files with 4 additions and 0 deletions
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4
kernel/gen_kheaders.sh
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@ -83,6 +83,10 @@ 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;'