Re: Timestamps in ...-autoloads.el files

[Alex Kost <alezost@gmail.com>]

Ludovic Courtès (2015-11-14 18:03 +0300) wrote:

> Alex Kost <alezost@gmail.com> skribis:
>
>> Ludovic Courtès (2015-11-03 16:27 +0300) wrote:
>
> [...]
>
>>>> +  ;; Avoid non-determinism related to generated timestamps.
>>>> +  (setenv "SOURCE_DATE_EPOCH" "1")
>>>> +
>>>>    ;; The trick is to #:allow-other-keys everywhere, so that each procedure in
>>>>    ;; PHASES can pick the keyword arguments it's interested in.
>>>>    (every (match-lambda
>>>
>>> Yes, as simple as this.
>>
>> Great, thanks!  I see that you used (setenv "SOURCE_DATE_EPOCH" "0") in
>> 'tk-update' commit, so I also changed the value to "0".
>
> Oh, good point.  I don’t know if it matters much (for Python it seems to
> make no difference), but I think “1” is the safest choice because the
> mtime on files in the store is set to 1, not 0.  I’ll fix that in
> ‘tk-update’.

I see, thanks for explaining.

>>>>> Could you also submit it upstream, Cc’ing guix-devel and
>>>>> reproducible-builds@lists.alioth.debian.org?  Hopefully that is
>>>>> acceptable.  (I searched a bit but didn’t find a similar patch by the
>>>>> Debian Reproducible team, but patch-tracker.debian.org is unreachable.)
>>>>
>>>> I'm afraid it's a too hard task for me, sorry.  I wouldn't like to mail
>>>> to so many places.
>>>
>>> Or email only emacs-devel if you prefer.
>>>
>>> An experienced Emacs hacker like you shouldn’t have to be afraid of that.
>>
>> After fighting with myself for all these days, I must admit I'm not
>> brave enough for this task yet, sorry.
>
> You’re not the one to be sorry.  It tells more about the weaknesses of
> the Emacs developer community than about yours.

Oh, no, no; it's totally me.  I have problems with communicating with
people.

> I’ll post it if you don’t mind.

Yes, please, it would be a great relief for me, thank you!

>> From a99fb41a7b84dd28c1a5b3f53cf14ca3c43785e7 Mon Sep 17 00:00:00 2001
>> From: Alex Kost <alezost@gmail.com>
>> Date: Sat, 14 Nov 2015 14:04:43 +0300
>> Subject: [PATCH 1/2] build-system/gnu: Set 'SOURCE_DATE_EPOCH'.
>> MIME-Version: 1.0
>> Content-Type: text/plain; charset=UTF-8
>> Content-Transfer-Encoding: 8bit
>>
>> Suggested by Ludovic Courtès <ludo@gnu.org>.
>>
>> * guix/build/gnu-build-system.scm (gnu-build): Set SOURCE_DATE_EPOCH for
>>   deterministic builds.
>
> [...]
>
>> +  ;; Avoid non-determinism related to generated timestamps.
>> +  (setenv "SOURCE_DATE_EPOCH" "0")
>
> OK with that set to 1.

Fixed and pushed, thanks.

-- 
Alex