GNU bug report logs - #35511
[PATCH 0/1] Add configure flag to emacs to improve repoducibility

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#35511: closed ([PATCH 0/1] Add configure flag to emacs to
 improve repoducibility)
Date: Tue, 21 May 2019 20:51:02 +0000

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Your message dated Tue, 21 May 2019 22:50:20 +0200
with message-id <87tvdny1kj.fsf <at> gnu.org>
and subject line Re: [bug#35511] [PATCH 0/1] Add configure flag to emacs to improve repoducibility
has caused the debbugs.gnu.org bug report #35511,
regarding [PATCH 0/1] Add configure flag to emacs to improve repoducibility
to be marked as done.

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From: wednesday <jessejohngildersleve <at> zohomail.eu>
To: guix-patches <at> gnu.org
Cc: wednesday <jessejohngildersleve <at> zohomail.eu>
Subject: [PATCH 0/1] Add configure flag to emacs to improve repoducibility
Date: Tue, 30 Apr 2019 22:28:04 +0100

This patch adds the --disable-build-details configure-flag to the emacs package.
By default the emacs binary stores some information about how it was build, as
stated here:
"By default the dumped emacs executable records details such as the build time and host name. Use the --disable-build-details option of configure to suppress these details, so that building and installing Emacs twice from the same sources is more likely to result in identical copies of Emacs."
https://www.gnu.org/software/emacs/manual/html_node/elisp/Building-Emacs.html

There is also this mailing list post about emacs repoducibility:
https://lists.gnu.org/archive/html/emacs-devel/2016-11/msg00711.html

wednesday (1):
  gnu: emacs: Make build more reproducible

 gnu/packages/emacs.scm | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

-- 
2.21.0

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From: Ludovic Courtès <ludo <at> gnu.org>
To: wednesday <jessejohngildersleve <at> zohomail.eu>
Cc: 35511-done <at> debbugs.gnu.org
Subject: Re: [bug#35511] [PATCH 0/1] Add configure flag to emacs to improve
 repoducibility
Date: Tue, 21 May 2019 22:50:20 +0200

Hi wednesday,

wednesday <jessejohngildersleve <at> zohomail.eu> skribis:

> This patch adds the --disable-build-details configure-flag to the emacs package.
> By default the emacs binary stores some information about how it was build, as
> stated here:
> "By default the dumped emacs executable records details such as the build time and host name. Use the --disable-build-details option of configure to suppress these details, so that building and installing Emacs twice from the same sources is more likely to result in identical copies of Emacs."
> https://www.gnu.org/software/emacs/manual/html_node/elisp/Building-Emacs.html
>
> There is also this mailing list post about emacs repoducibility:
> https://lists.gnu.org/archive/html/emacs-devel/2016-11/msg00711.html

This is the right thing to do, applied!

I’m committing a followup that does the same for ‘emacs-minimal’ (even
though ‘emacs-minimal’ has 784 dependent packages, I’m committing to
‘master’ because most of these build in a few seconds.)

I’ve run:

  guix challenge emacs \
    --substitute-urls='https://mirror.hydra.gnu.org https://berlin.guix.gnu.org'

on a commit before this patch, and there’s the ‘.emacs-real’ binary
alongside a dozen of .elc files that differ.  So this may not be the end
of the road, but we should keep monitoring with ‘challenge’ and ‘--check’.

Thank you!

Ludo’.

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