GNU bug report logs - #72232
"make dist" is not reproducible

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Bruno Haible <bruno <at> clisp.org>
Subject: bug#72232: closed (Re: bug#72232: "make dist" is not reproducible)
Date: Sun, 21 Jul 2024 17:46:02 +0000

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Your bug report

#72232: "make dist" is not reproducible

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 72232 <at> debbugs.gnu.org.

-- 
72232: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=72232
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Pádraig Brady <P <at> draigBrady.com>
To: Bruno Haible <bruno <at> clisp.org>, 72232-done <at> debbugs.gnu.org
Cc: Simon Josefsson <simon <at> josefsson.org>
Subject: Re: bug#72232: "make dist" is not reproducible
Date: Sun, 21 Jul 2024 18:44:04 +0100

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On 21/07/2024 17:18, Bruno Haible wrote:
> Hi,
> 
> Subsequent runs of "make dist" in the same environment produce tarballs with
> different contents.
> 
> How to reproduce:
> 
> In a git checkout of coreutils, do:
> 
> $ echo snapshot > .tarball-version
> $ ./configure; make -k maintainer-clean
> $ ./bootstrap
> $ ./configure; make dist
> $ mkdir 1; (cd 1 && tar xf ../*.tar.gz)
> $ make; make dist
> $ mkdir 2; (cd 2 && tar xf ../*.tar.gz)
> $ diff -r -q 1 2
> 
> The last command produces a difference:
> 
> $ diff -r -q 1 2
> Files 1/coreutils-snapshot/.timestamp and 2/coreutils-snapshot/.timestamp differ
> $ cat 1/coreutils-snapshot/.timestamp
> 1721577765
> $ cat 2/coreutils-snapshot/.timestamp
> 1721577832
> 
> Can this be avoided? Can the contents of '.timestamp' always be the same?
> (Wouldn't it be enough to give it a different modification time, each time?)

Right, we should be able to adjust this.
The .timestamp file was added to support reproducible _builds_:
https://github.com/coreutils/coreutils/commit/c1b3d6587
https://reproducible-builds.org/docs/source-date-epoch/

We can just rely on the timestamp of the .tarball-version
to support reproducible _tarballs_.
That's done in the attached, which I'll apply later.

Marking this as done.

thanks,
Pádraig

[coreutils-repro-dist.patch (text/x-patch, attachment)]

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From: Bruno Haible <bruno <at> clisp.org>
To: bug-coreutils <at> gnu.org
Cc: Simon Josefsson <simon <at> josefsson.org>
Subject: "make dist" is not reproducible
Date: Sun, 21 Jul 2024 18:18:06 +0200

Hi,

Subsequent runs of "make dist" in the same environment produce tarballs with
different contents.

How to reproduce:

In a git checkout of coreutils, do:

$ echo snapshot > .tarball-version
$ ./configure; make -k maintainer-clean
$ ./bootstrap
$ ./configure; make dist
$ mkdir 1; (cd 1 && tar xf ../*.tar.gz)
$ make; make dist
$ mkdir 2; (cd 2 && tar xf ../*.tar.gz)
$ diff -r -q 1 2

The last command produces a difference:

$ diff -r -q 1 2
Files 1/coreutils-snapshot/.timestamp and 2/coreutils-snapshot/.timestamp differ
$ cat 1/coreutils-snapshot/.timestamp
1721577765
$ cat 2/coreutils-snapshot/.timestamp
1721577832

Can this be avoided? Can the contents of '.timestamp' always be the same?
(Wouldn't it be enough to give it a different modification time, each time?)

Bruno

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