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kheaders: make it possible to override TAR

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Commit 86cdd2fdc4 ("kheaders: make headers archive reproducible")
introduced a number of options specific to GNU tar to the `tar`
invocation in `gen_kheaders.sh` script. This causes the script to fail
to work on systems where `tar` is not GNU tar. This can occur e.g.
on recent Gentoo Linux installations that support using bsdtar from
libarchive instead.

Add a `TAR` make variable to make it possible to override the tar
executable used, e.g. by specifying:

  make TAR=gtar

Link: https://bugs.gentoo.org/884061
Reported-by: Sam James <sam@gentoo.org>
Tested-by: Sam James <sam@gentoo.org>
Co-developed-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Michał Górny <mgorny@gentoo.org>
Signed-off-by: Sam James <sam@gentoo.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Michał Górny 2025-07-29 15:24:55 +02:00 committed by Masahiro Yamada
parent 936599ca51
commit 73d210e9fa
2 changed files with 5 additions and 4 deletions
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3
Makefile
View File

@ -543,6 +543,7 @@ LZMA = lzma
LZ4 = lz4
XZ = xz
ZSTD = zstd
TAR = tar
CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
-Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@ -622,7 +623,7 @@ export RUSTC RUSTDOC RUSTFMT RUSTC_OR_CLIPPY_QUIET RUSTC_OR_CLIPPY BINDGEN
export HOSTRUSTC KBUILD_HOSTRUSTFLAGS
export CPP AR NM STRIP OBJCOPY OBJDUMP READELF PAHOLE RESOLVE_BTFIDS LEX YACC AWK INSTALLKERNEL
export PERL PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD
export KGZIP KBZIP2 KLZOP LZMA LZ4 XZ ZSTD TAR
export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS KBUILD_PROCMACROLDFLAGS LDFLAGS_MODULE
export KBUILD_USERCFLAGS KBUILD_USERLDFLAGS

6
kernel/gen_kheaders.sh
View File

@ -30,8 +30,8 @@ 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}"
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
@ -43,7 +43,7 @@ xargs -0 -P8 -n1 \
rm -f "${tmpdir}.contents.txt"
# Create archive and try to normalize metadata for reproducibility.
tar "${timestamp:+--mtime=$timestamp}" \
${TAR} "${timestamp:+--mtime=$timestamp}" \
--owner=0 --group=0 --sort=name --numeric-owner --mode=u=rw,go=r,a+X \
-I "${XZ}" -cf "${tarfile}" -C "${tmpdir}/" . > /dev/null