firmware-utils: honor env SOURCE_DATE_EPOCH

[openwrt/openwrt.git] / tools / firmware-utils / src / jcgimage.c

diff --git a/tools/firmware-utils/src/jcgimage.c b/tools/firmware-utils/src/jcgimage.c
index 7755eab1ed32ff9eca1f8dffb05429a35eed9e94..354c26be19b2a242b9bb5509acfdd008c52f73ed 100644 (file)
--- a/tools/firmware-utils/src/jcgimage.c
+++ b/tools/firmware-utils/src/jcgimage.c
@@ -158,6 +158,20 @@ opensize(char *name, size_t *size)
        return fd;
 }
 
+static time_t source_date_epoch = -1;
+static void set_source_date_epoch() {
+       char *env = getenv("SOURCE_DATE_EPOCH");
+       char *endptr = env;
+       errno = 0;
+        if (env && *env) {
+               source_date_epoch = strtoull(env, &endptr, 10);
+               if (errno || (endptr && *endptr != '\0')) {
+                       fprintf(stderr, "Invalid SOURCE_DATE_EPOCH");
+                       exit(1);
+               }
+        }
+}
+
 /*
  * Write the JCG header
  */
@@ -167,6 +181,13 @@ mkjcgheader(struct jcg_header *h, size_t psize, char *version)
        uLong crc;
        uint16_t major = 0, minor = 0;
        void *payload = (void *)h + sizeof(*h);
+       time_t t;
+
+       if (source_date_epoch != -1) {
+               t = source_date_epoch;
+       } else if ((time(&t) == (time_t)(-1))) {
+               err(1, "time call failed");
+       }
 
        if (version != NULL) {
                if (sscanf(version, "%hu.%hu", &major, &minor) != 2) {
@@ -177,7 +198,7 @@ mkjcgheader(struct jcg_header *h, size_t psize, char *version)
        memset(h, 0, sizeof(*h));
        h->jh_magic = htonl(JH_MAGIC);
        h->jh_type  = htonl(1);
-       h->jh_time  = htonl(time(NULL));
+       h->jh_time  = htonl(t);
        h->jh_major = htons(major);
        h->jh_minor = htons(minor);
 
@@ -303,6 +324,7 @@ main(int argc, char **argv)
        /* Make sure the headers have the right size */
        assert(sizeof(struct jcg_header) == 512);
        assert(sizeof(struct uimage_header) == 64);
+       set_source_date_epoch();
 
        while ((c = getopt(argc, argv, "o:k:f:u:v:h")) != -1) {
                switch (c) {