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Revert "kheaders: make headers archive reproducible"

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This reverts commit 86cdd2fdc4.

Reason: Broke "make allmodconfig" on Android build machines

$ tar: unrecognized option '--sort=name'
Try 'tar --help' or 'tar --usage' for more information.

Signed-off-by: Alistair Delva <adelva@google.com>
Change-Id: I3d406988f23201e5ab824ca7aed215ccc9d43279
This commit is contained in:
Alistair Delva
2019-10-09 15:25:35 -04:00
parent bb6a56a43e
commit 72b09c63e4
2 changed files with 5 additions and 13 deletions
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13
Documentation/kbuild/reproducible-builds.rst
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@@ -16,21 +16,16 @@ the kernel may be unreproducible, and how to avoid them.
Timestamps
----------
The kernel embeds timestamps in three places:
The kernel embeds a timestamp in two places:
* The version string exposed by ``uname()`` and included in
``/proc/version``
* File timestamps in the embedded initramfs
* If enabled via ``CONFIG_IKHEADERS``, file timestamps of kernel
headers embedded in the kernel or respective module,
exposed via ``/sys/kernel/kheaders.tar.xz``
By default the timestamp is the current time and in the case of
``kheaders`` the various files' modification times. This must
be overridden using the `KBUILD_BUILD_TIMESTAMP`_ variable.
If you are building from a git commit, you could use its commit date.
By default the timestamp is the current time. This must be overridden
using the `KBUILD_BUILD_TIMESTAMP`_ variable. If you are building
from a git commit, you could use its commit date.
The kernel does *not* use the ``__DATE__`` and ``__TIME__`` macros,
and enables warnings if they are used. If you incorporate external

5
kernel/gen_kheaders.sh
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@@ -71,10 +71,7 @@ done | cpio --quiet -pd $cpio_dir >/dev/null 2>&1
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 \
-Jcf $tarfile -C $cpio_dir/ . > /dev/null
tar -Jcf $tarfile -C $cpio_dir/ . > /dev/null
echo "$src_files_md5" > kernel/kheaders.md5
echo "$obj_files_md5" >> kernel/kheaders.md5