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

[Vagrant Cascadian]

On 2015-07-20, Paul Kocialkowski wrote:
> 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.
...
> 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

This does effectively hard-code U_BOOT_TZ to UTC; may as well not call
date for setting U_BOOT_TZ. Or conditionally set it to UTC only when
SOURCE_DATE_EPOCH is set?

Any reason not to use the longhand options for date, e.g. --utc and
--date ? They're more readable; are they less portable?


live well,
  vagrant
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