GNU bug report logs - #48661
reproducibility: build date in modus-themes.info

Previous Next

To add a comment to this bug, you must first unarchive it, by sending
a message to control AT debbugs.gnu.org, with unarchive 48661 in the body.
You can then email your comments to 48661 AT debbugs.gnu.org in the normal way.

Toggle the display of automated, internal messages from the tracker.

Message #3 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: submit <at> debbugs.gnu.org
Subject: reproducibility: build date in modus-themes.info
Date: Tue, 25 May 2021 17:50:40 -0400

Package: emacs
Version: 28.0.50
Severity: minor

doc/misc/modus-themes.org contains this:

   This manual was built on {{{export-date}}}.

This makes the generated info file non-reproducible (different every build).
Please consider removing this information.

Message #8 received at 48661-done <at> debbugs.gnu.org (full text, mbox):

From: Protesilaos Stavrou <info <at> protesilaos.com>
To: Glenn Morris <rgm <at> gnu.org>, 48661-done <at> debbugs.gnu.org
Subject: Re: bug#48661: reproducibility: build date in modus-themes.info
Date: Wed, 26 May 2021 12:15:19 +0300

On 2021-05-25, 17:50 -0400, Glenn Morris <rgm <at> gnu.org> wrote:

> Package: emacs
> Version: 28.0.50
> Severity: minor
>
> doc/misc/modus-themes.org contains this:
>
>    This manual was built on {{{export-date}}}.
>
> This makes the generated info file non-reproducible (different every build).
> Please consider removing this information.

Thank you!  I just installed the changes as commit 5a762c946e.


-- 
Protesilaos Stavrou
https://protesilaos.com

Message #11 received at 48661 <at> debbugs.gnu.org (full text, mbox):

From: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
To: Glenn Morris <rgm <at> gnu.org>
Cc: info <at> protesilaos.com, 48661 <at> debbugs.gnu.org
Subject: Re: bug#48661: reproducibility: build date in modus-themes.info
Date: Wed, 26 May 2021 12:22:22 +0200

Glenn Morris <rgm <at> gnu.org> writes:

>    This manual was built on {{{export-date}}}.
>
> This makes the generated info file non-reproducible (different every build).
> Please consider removing this information.

Question from the peanut gallery: are timestamp information really
verboten in reproducible builds?  I was led to believe that the
SOURCE_DATE_EPOCH mechanism was introduced to allow programs to keep
embedding this information, while giving packagers the means to assert
reproducibility.

https://reproducible-builds.org/docs/source-date-epoch/

I am not well-versed on the subject of reproducible builds, so I
apologize if I am misunderstanding the state of things; also, since I
don't think the Emacs build system uses the SOURCE_DATE_EPOCH mechanism,
I realize that this idea might be out of scope for this bug report…

Message #14 received at 48661 <at> debbugs.gnu.org (full text, mbox):

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Kévin Le Gouguec <kevin.legouguec <at> gmail.com>
Cc: Glenn Morris <rgm <at> gnu.org>, info <at> protesilaos.com, 48661 <at> debbugs.gnu.org
Subject: Re: bug#48661: reproducibility: build date in modus-themes.info
Date: Wed, 26 May 2021 12:40:11 +0200

On Mai 26 2021, Kévin Le Gouguec wrote:

> Question from the peanut gallery: are timestamp information really
> verboten in reproducible builds?  I was led to believe that the
> SOURCE_DATE_EPOCH mechanism was introduced to allow programs to keep
> embedding this information, while giving packagers the means to assert
> reproducibility.

That requires support for SOURCE_DATE_EPOCH in each place a timestamp is
generated.  For example, gcc does that for __DATE__ and __TIME__.  If
org wants to keep the timestamp it should add support for
SOURCE_DATE_EPOCH.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.