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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>
Bruce Ashfield 4 лет назад
Родитель
Сommit
f511d78164
1 измененных файлов с 15 добавлено и 0 удалено
  1. 15 0
      meta/classes/kernel.bbclass

+ 15 - 0
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}