[U-Boot] [PATCH] Reproducible U-Boot build support, using SOURCE_DATE_EPOCH

[Paul Kocialkowski <contact@paulk.fr>]

> I am just on the jump into my holidays, so I have not yet the time
> to test it ... I want to try it for all builds with the scripts
> I posted with my v2 ... but a first fast look into your patch looks
> nice, if it works, it is ok with me ... I am back aprox. july 5th.

Okay, maybe I'll have a go at your scripts then! The idea to coordinate
with Debian developers would be to use their infrastructure to
automatically test as many u-boot targets as possible in an automated
and periodical manner (e.g. once a month), so that we can easily spot
which target is broken or which commit introduced a regression.

> maybe a README entry would be fine ;-)

Good point, that makes sense. I'll craft that in v2. I'll just wait for
some more feedback before sending a new version.

Thanks!

> > It would be nice to have this tested on as many boards as possible to
> > spot other areas that make the binaries not reproducible. However, I
> > doubt this patch will evolve much and other fixes should be sent in
> > subsequent patches.
> >
> >> Signed-off-by: Paul Kocialkowski <contact@paulk.fr>
> >> ---
> >>   Makefile              |  7 ++++---
> >>   tools/default_image.c | 21 ++++++++++++++++++++-
> >>   2 files changed, 24 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/Makefile b/Makefile
> >> index 37cc4c3..71aeac7 100644
> >> --- a/Makefile
> >> +++ b/Makefile
> >> @@ -1231,9 +1231,10 @@ define filechk_version.h
> >>   endef
> >>
> >>   define filechk_timestamp.h
> >> -	(LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \
> >> -	LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \
> >> -	LC_ALL=C date +'#define U_BOOT_TZ "%z"')
> >> +	(SOURCE_DATE="$${SOURCE_DATE_EPOCH:+@$$SOURCE_DATE_EPOCH}"; \
> >> +	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
> >> +	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TIME "%T"'; \
> >> +	LC_ALL=C date -u -d "$${SOURCE_DATE:-now}" +'#define U_BOOT_TZ "%z"' )
> >>   endef
> >>
> >>   $(version_h): include/config/uboot.release FORCE
> >> 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);
> >
> 

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