From: Bruce Ashfield <bruce.ashfi...@gmail.com>
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.ashfi...@gmail.com>
---
meta/classes/kernel.bbclass | 15 +++++++++++++++
1 file changed, 15 insertions(+)
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}
--
2.19.1
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