openwrt/tools/mtd-utils/patches/320-mkfs.jffs2-SOURCE_DATE_EPOCH.patch

--- a/jffsX-utils/mkfs.jffs2.c
+++ b/jffsX-utils/mkfs.jffs2.c
@@ -109,7 +109,7 @@ static char *rootdir = default_rootdir;
 static int verbose = 0;
 static int squash_uids = 0;
 static int squash_perms = 0;
-static int fake_times = 0;
+static time_t fixed_timestamp = -1;
 int target_endian = __BYTE_ORDER;
 
 static uint32_t find_hardlink(struct filesystem_entry *e)
@@ -251,8 +251,8 @@ static struct filesystem_entry *add_host
 			mode &= ~(S_ISUID | S_ISGID);
 		}
 	}
-	if (fake_times) {
-		timestamp = 0;
+	if (fixed_timestamp != -1) {
+		timestamp = fixed_timestamp;
 	}
 
 	entry = xcalloc(1, sizeof(struct filesystem_entry));
@@ -1559,6 +1559,20 @@ static void parse_image(void){
 	close(in_fd);
 }
 
+static void set_source_date_epoch() {
+	char *env = getenv("SOURCE_DATE_EPOCH");
+	char *endptr = env;
+	errno = 0;
+	if (env && *env) {
+		fixed_timestamp = strtoull(env, &endptr, 10);
+		if (errno || (endptr && *endptr != '\0')) {
+			fprintf(stderr, "Invalid SOURCE_DATE_EPOCH");
+			exit(1);
+		}
+	}
+}
+
+
 int main(int argc, char **argv)
 {
 	int c, opt;
@@ -1577,6 +1591,7 @@ int main(int argc, char **argv)
 		warn_page_size = 1; /* warn user if page size not 4096 */
 
 	jffs2_compressors_init();
+	set_source_date_epoch();
 
 	while ((opt = getopt_long(argc, argv,
 					"D:d:r:s:o:qUPfh?vVe:lbp::nc:m:x:X:Lty:i:", long_options, &c)) >= 0)
@@ -1627,7 +1642,7 @@ int main(int argc, char **argv)
 				break;
 
 			case 'f':
-				fake_times = 1;
+				fixed_timestamp = 0;
 				break;
 
 			case 'h':