[openwrt/openwrt] tools/firmware-utils: use UTC for image timestamps

[LEDE Commits]

jow pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/34271d38ae9087816219de0bf9ff5197483277e6

commit 34271d38ae9087816219de0bf9ff5197483277e6
Author: Sander Vanheule <sander at svanheule.net>
AuthorDate: Thu Aug 6 22:10:32 2020 +0200

    tools/firmware-utils: use UTC for image timestamps
    
    By using localtime() to determine the timestamp that goes into factory
    images, the resulting image depends on the timezone of the build system.
    Use gmtime() instead, which results in more reproducible images.
    
    Signed-off-by: Sander Vanheule <sander at svanheule.net>
---
 tools/firmware-utils/Makefile                | 2 +-
 tools/firmware-utils/src/addpattern.c        | 2 +-
 tools/firmware-utils/src/tplink-safeloader.c | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/firmware-utils/Makefile b/tools/firmware-utils/Makefile
index ee0ef3a6fd..4fcda7e439 100644
--- a/tools/firmware-utils/Makefile
+++ b/tools/firmware-utils/Makefile
@@ -7,7 +7,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME := firmware-utils
-PKG_RELEASE := 1
+PKG_RELEASE := 2
 
 include $(INCLUDE_DIR)/host-build.mk
 include $(INCLUDE_DIR)/kernel.mk
diff --git a/tools/firmware-utils/src/addpattern.c b/tools/firmware-utils/src/addpattern.c
index 9bc4865335..9791527878 100644
--- a/tools/firmware-utils/src/addpattern.c
+++ b/tools/firmware-utils/src/addpattern.c
@@ -296,7 +296,7 @@ int main(int argc, char **argv)
 		return EXIT_FAILURE;
 	}
 
-	ptm = localtime(&t);
+	ptm = gmtime(&t);
 
 	if (3 != sscanf(version, "v%d.%d.%d", &v0, &v1, &v2)) {
 		fprintf(stderr, "bad version string \"%s\"\n", version);
diff --git a/tools/firmware-utils/src/tplink-safeloader.c b/tools/firmware-utils/src/tplink-safeloader.c
index a5f3ced16d..0af1fe4c6e 100644
--- a/tools/firmware-utils/src/tplink-safeloader.c
+++ b/tools/firmware-utils/src/tplink-safeloader.c
@@ -2079,7 +2079,7 @@ static struct image_partition_entry make_soft_version(uint32_t rev) {
 	else if (time(&t) == (time_t)(-1))
 		error(1, errno, "time");
 
-	struct tm *tm = localtime(&t);
+	struct tm *tm = gmtime(&t);
 
 	s->magic = htonl(0x0000000c);
 	s->zero = 0;