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authorPaul Kocialkowski <contact@paulk.fr>2015-07-26 18:48:15 +0200
committerTom Rini <trini@konsulko.com>2015-07-27 15:03:14 -0400
commitf3f431a712729a1af94d01bd1bfde17a252ff02c (patch)
tree8ce4a040eac05ef88909a5407cacc8b70add84ae /tools
parent9c5748775228f6648a99d1e28acef92012fa031e (diff)
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Reproducible U-Boot build support, using SOURCE_DATE_EPOCH
In order to achieve reproducible builds in U-Boot, timestamps that are defined at build-time have to be somewhat eliminated. The SOURCE_DATE_EPOCH environment variable allows setting a fixed value for those timestamps. Simply by setting SOURCE_DATE_EPOCH to a fixed value, a number of targets can be built reproducibly. This is the case for e.g. sunxi devices. However, some other devices might need some more tweaks, especially regarding the image generation tools. Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
Diffstat (limited to 'tools')
-rw-r--r--tools/default_image.c21
1 files changed, 20 insertions, 1 deletions
diff --git a/tools/default_image.c b/tools/default_image.c
index cf5c0d4..18940af 100644
--- a/tools/default_image.c
+++ b/tools/default_image.c
@@ -88,6 +88,9 @@ static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
struct image_tool_params *params)
{
uint32_t checksum;
+ char *source_date_epoch;
+ struct tm *time_universal;
+ time_t time;
image_header_t * hdr = (image_header_t *)ptr;
@@ -96,9 +99,25 @@ static void image_set_header(void *ptr, struct stat *sbuf, int ifd,
sizeof(image_header_t)),
sbuf->st_size - sizeof(image_header_t));
+ source_date_epoch = getenv("SOURCE_DATE_EPOCH");
+ if (source_date_epoch != NULL) {
+ time = (time_t) strtol(source_date_epoch, NULL, 10);
+
+ time_universal = gmtime(&time);
+ if (time_universal == NULL) {
+ fprintf(stderr, "%s: SOURCE_DATE_EPOCH is not valid\n",
+ __func__);
+ time = 0;
+ } else {
+ time = mktime(time_universal);
+ }
+ } else {
+ time = sbuf->st_mtime;
+ }
+
/* Build new header */
image_set_magic(hdr, IH_MAGIC);
- image_set_time(hdr, sbuf->st_mtime);
+ image_set_time(hdr, time);
image_set_size(hdr, sbuf->st_size - sizeof(image_header_t));
image_set_load(hdr, params->addr);
image_set_ep(hdr, params->ep);