054f3fd57b
OpenWrt uses ancient u-boot thats not reproducible. There are multiple upstream changes that introduce reproducible builds like: 859e92b775fd8ebcfacc591eaf621b677c95b6f7 (not used here - the CMD_DATE/TIMESTAMP functionality seems to be disabled by config) 70d39f57146a6cb94736db39c770c3d95e07bedb f3f431a712729a1af94d01bd1bfde17a252ff02c 2d9efa1227262249d381ed5d9d341cbdba76e62d Instead of changing the Makefile too much this changeset just tries to use the changes in Makefile from current upstream git f5fd45f *Should* fix issue reported by reproducible lede page: https://tests.reproducible-builds.org/lede/lede.html Compile tested only (verified w. hexdump & md5sum) Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>
82 lines
2.6 KiB
Diff
82 lines
2.6 KiB
Diff
From f3f431a712729a1af94d01bd1bfde17a252ff02c Mon Sep 17 00:00:00 2001
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From: Paul Kocialkowski <contact@paulk.fr>
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Date: Sun, 26 Jul 2015 18:48:15 +0200
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Subject: [PATCH] Reproducible U-Boot build support, using SOURCE_DATE_EPOCH
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In order to achieve reproducible builds in U-Boot, timestamps that are defined
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at build-time have to be somewhat eliminated. The SOURCE_DATE_EPOCH environment
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variable allows setting a fixed value for those timestamps.
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Simply by setting SOURCE_DATE_EPOCH to a fixed value, a number of targets can be
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built reproducibly. This is the case for e.g. sunxi devices.
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However, some other devices might need some more tweaks, especially regarding
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the image generation tools.
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Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
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---
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Makefile | 7 ++++---
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README | 12 ++++++++++++
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tools/default_image.c | 21 ++++++++++++++++++++-
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3 files changed, 36 insertions(+), 4 deletions(-)
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--- a/README
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+++ b/README
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@@ -2785,6 +2785,18 @@ Low Level (hardware related) configurati
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that is executed before the actual U-Boot. E.g. when
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compiling a NAND SPL.
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+Reproducible builds
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+-------------------
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+
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+In order to achieve reproducible builds, timestamps used in the U-Boot build
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+process have to be set to a fixed value.
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+
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+This is done using the SOURCE_DATE_EPOCH environment variable.
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+SOURCE_DATE_EPOCH is to be set on the build host's shell, not as a configuration
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+option for U-Boot or an environment variable in U-Boot.
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+
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+SOURCE_DATE_EPOCH should be set to a number of seconds since the epoch, in UTC.
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+
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Building the Software:
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======================
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--- a/tools/default_image.c
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+++ b/tools/default_image.c
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@@ -101,6 +101,9 @@ static void image_set_header (void *ptr,
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struct mkimage_params *params)
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{
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uint32_t checksum;
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+ char *source_date_epoch;
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+ struct tm *time_universal;
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+ time_t time;
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image_header_t * hdr = (image_header_t *)ptr;
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@@ -109,9 +112,25 @@ static void image_set_header (void *ptr,
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sizeof(image_header_t)),
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sbuf->st_size - sizeof(image_header_t));
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+source_date_epoch = getenv("SOURCE_DATE_EPOCH");
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+ if (source_date_epoch != NULL) {
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+ time = (time_t) strtol(source_date_epoch, NULL, 10);
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+
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+ time_universal = gmtime(&time);
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+ if (time_universal == NULL) {
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+ fprintf(stderr, "%s: SOURCE_DATE_EPOCH is not valid\n",
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+ __func__);
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+ time = 0;
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+ } else {
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+ time = mktime(time_universal);
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+ }
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+ } else {
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+ time = sbuf->st_mtime;
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+ }
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+
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/* Build new header */
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image_set_magic (hdr, IH_MAGIC);
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- image_set_time (hdr, sbuf->st_mtime);
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+ image_set_time(hdr, time);
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image_set_size (hdr, sbuf->st_size - sizeof(image_header_t));
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image_set_load (hdr, params->addr);
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image_set_ep (hdr, params->ep);
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