From 5b5a34737cfc37a4d80da7ad5e158b36ee7ce5b9 Mon Sep 17 00:00:00 2001
From: Sungbo Eo <mans0n@gorani.run>
Date: Sat, 12 Feb 2022 17:01:31 +0900
Subject: [PATCH] build: image: use UTC for zip timestamp

Zip uses DOS timestamp for mtime which is stored in local time and hence
depends on the timezone of the build system. Force zip to use UTC timezone
to make image builds more reproducible.

Signed-off-by: Sungbo Eo <mans0n@gorani.run>
(cherry picked from commit e42764cc5fa364e9fa553903c56191484738965e)
---
 include/image-commands.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 4686c89f61..e20c303b71 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -183,7 +183,7 @@ define Build/zip
 	mkdir $@.tmp
 	mv $@ $@.tmp/$(1)
 
-	zip -j -X \
+	TZ=UTC zip -j -X \
 		$@ $@.tmp/$(if $(1),$(1),$@)
 	rm -rf $@.tmp
 endef