[PATCH] use SOURCE_DATE_EPOCH for timestamp if available

Paul Spooren mail at aparcar.org
Fri May 14 12:18:15 UTC 2021

On 5/14/21 1:42 PM, Holger Levsen wrote:
> Hi Paul,
> is there a public thread where this is being discussed? Or alternativly,
> can I or you re-post this to the rb-general list?

Please see their mail archive:


> On Thu, May 13, 2021 at 11:39:05PM +0200, Paul Spooren wrote:
>> The SOURCE_DATE_EPOCH is an effort of the Reproducible Builds
>> organization to make timestamps/build dates in compiled tools
>> deterministic over several repetitive builds.
>> Busybox shows by default the build date timestamp which changes whenever
>> compiled. To have a reasonable accurate build date while staying
>> reproducible, it's possible to use the *date of last source
>> modification* rather than the current time and date.
>> Further information on SOURCE_DATE_EPOCH are available online [1].
>> This patch modifies `confdata.c` so that the content of the
>> SOURCE_DATE_EPOCH env variable is used as timestamp.
> I wonder why busybox is reproducible on Debian (well, except on i386..),
> see https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/busybox.html
> The Debian package sources don't contain the string SOURCE_DATE_EPOCH...

I haven't checked but I'm guessing they do like Archlinux and OpenWrt, 
simply disabling the timestamp via KCONFIG_NOTIMESTAMP=1.


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