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kernel/reproducibility: kernel modules need SOURCE_DATE_EPOCH export

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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.

(From OE-Core rev: 82cdfcdccfedd320ebc0cdc778c7d4966198b96f)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bruce Ashfield
2020-05-13 10:24:35 -04:00
committed by Richard Purdie
parent 36a0e7e045
commit 68ad047228
1 changed files with 15 additions and 0 deletions
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15
meta/classes/kernel.bbclass
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@@ -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}