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author | Bruce Ashfield <bruce.ashfield@gmail.com> | 2020-05-13 10:24:35 -0400 |
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committer | Steve Sakoman <steve@sakoman.com> | 2020-06-01 07:16:00 -1000 |
commit | f511d78164581f80e7b8c592fe88ffbf38738150 (patch) | |
tree | e3809016ed68b3334e35a7ecdae7fbb80d3ee27a /meta | |
parent | bb126c867adbe3eca3f30670e7b2e84bf98e97cf (diff) | |
download | openembedded-core-f511d78164581f80e7b8c592fe88ffbf38738150.tar.gz |
kernel/reproducibility: kernel modules need SOURCE_DATE_EPOCH export
If CONFIG_IKHEADERS is set to =m, then reproducibility issues creep
into the modules build, since the variables we are setting for the
main kernel build are not present.
Since the source code must be available for a possibly git query
on the timestamp, there didn't seem to be an easy way to move the
environment variable setting to a common routine. As such, we
duplicate the block of code that exports the required variables for
reproducible builds. There is a maintenance risk to this, but any
issues should be easy enough to catch.
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 82cdfcdccfedd320ebc0cdc778c7d4966198b96f)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Diffstat (limited to 'meta')
-rw-r--r-- | meta/classes/kernel.bbclass | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass index a724645466..a3990aaf59 100644 --- a/meta/classes/kernel.bbclass +++ b/meta/classes/kernel.bbclass @@ -331,6 +331,21 @@ kernel_do_compile() { do_compile_kernelmodules() { unset CFLAGS CPPFLAGS CXXFLAGS LDFLAGS MACHINE + if [ "${BUILD_REPRODUCIBLE_BINARIES}" = "1" ]; then + # kernel sources do not use do_unpack, so SOURCE_DATE_EPOCH may not + # be set.... + if [ "${SOURCE_DATE_EPOCH}" = "" -o "${SOURCE_DATE_EPOCH}" = "0" ]; then + # The source directory is not necessarily a git repository, so we + # specify the git-dir to ensure that git does not query a + # repository in any parent directory. + SOURCE_DATE_EPOCH=`git --git-dir="${S}/.git" log -1 --pretty=%ct 2>/dev/null || echo "${REPRODUCIBLE_TIMESTAMP_ROOTFS}"` + fi + + ts=`LC_ALL=C date -d @$SOURCE_DATE_EPOCH` + export KBUILD_BUILD_TIMESTAMP="$ts" + export KCONFIG_NOTIMESTAMP=1 + bbnote "KBUILD_BUILD_TIMESTAMP: $ts" + fi if (grep -q -i -e '^CONFIG_MODULES=y$' ${B}/.config); then cc_extra=$(get_cc_option) oe_runmake -C ${B} ${PARALLEL_MAKE} modules CC="${KERNEL_CC} $cc_extra " LD="${KERNEL_LD}" ${KERNEL_EXTRA_ARGS} |