[OE-core] [OE-Core][PATCH 2/2] kernel: Set SOURCE_DATE_EPOCH to kernel git timestamp if not set

[Alex Kiernan]

If SOURCE_DATE_EPOCH is unset (in addition to the existing "0" behaviour)
parse out the top most commit timestamp from the kernel tree to use as the
timestamp.

Signed-off-by: Alex Kiernan <alex.kiernan at gmail.com>
---

 meta/classes/kernel.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index 972ac52..3213b93 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -288,7 +288,7 @@ kernel_do_compile() {
 	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" = "0" ]; then
+		if [ "${SOURCE_DATE_EPOCH}" = "" -o "${SOURCE_DATE_EPOCH}" = "0" ]; then
 			olddir=`pwd`
 			cd ${S}
 			SOURCE_DATE_EPOCH=`git log  -1 --pretty=%ct`
-- 
2.7.4