Hi,

Whilst working on the Reproducible Builds effort [0] we noticed that
paper-icon-theme could not be built reproducibly.

This is caused by jdupes iterating over its arguments using the
filesystem ordering, instead of using their filenames. A patch is
attached that sorts the input prior to passing it to jdupes (using
find, sort and xargs), but it may be more sensible that jdupes does
this itself. Indeed, the jdupes manpage implies that it should do
this, but I leave this up to your (almost certainly more informed)
judgement.

 [0] https://reproducible-builds.org/


Regards,

Hi, Chris.

Thanks for contacting about this. Indeed, it would be better to fix it
upstream. I've opened a bug against jdupes [1] when I realized the
reproducibility issue and the upstream developer acknowledge it, placing
it in the roadmap, though I don't think he had the time to fix it yet.

I just would like to know if you tested the patch? I've seem that it
happens in x86_32 and armhf, but I don't have the hardware to test the
fix. Also would like to ask if I can forward your email to [1] and the
upstream developer.

Thanks for the patch,
Charles

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=975684

Hi Carlos,

Ah yes; in retrospect, I perhaps should have filed this directly
against jdupes myself (or found the existing bug). Thank you for doing
that.

I tested the patch, yes; does it not work for you? The difference
between architectures could simply be a difference in the
reproducibility variations applied on that particular architecture. Or
the differences could be merely an example of the nondeterminism
itself.

Sure, if you think it might help.


Regards,

Hi, Chris.

Actually, I wasn't able to reproduce this issue on my machine. I tested
back when the issue appeared and now that you submitted the patch and
the builds on my machine are identical. I've applied the patch and
pushed it to salsa to execute the CI pipeline. It passed the reprotest
test, so I think it solves the bug - thanks!

This bug should be closed in the next upload.

Cheers,
Charles

Hi Carlos,
ordering issue, it's unsurprising that you could not easily reproduce
it locally.

Unless you use disorderfs or similar, most file systems will happen to
return directory entries in the same order if asked multiple times in
a row — the underlying problem is that this is not defined and/or
deterministic.


Best wishes,

We believe that the bug you reported is fixed in the latest version of
paper-icon-theme, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1005955@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Carlos Henrique Lima Melara <charlesmelara@outlook.com> (supplier of updated paper-icon-theme package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 17 Jul 2022 13:22:46 -0300
Source: paper-icon-theme
Architecture: source
Version: 1.5.0+git20200312.aa3e8af-4
Distribution: unstable
Urgency: medium
Maintainer: Carlos Henrique Lima Melara <charlesmelara@outlook.com>
Changed-By: Carlos Henrique Lima Melara <charlesmelara@outlook.com>
Closes: 1005955
Changes:
 paper-icon-theme (1.5.0+git20200312.aa3e8af-4) unstable; urgency=medium
 .
   * debian/control: bumped Standards-Version to 4.6.1.
   * debian/copyright: updated packaging copyright years.
   * debian/rules: added patch to build reproducible. Thanks to Chris Lamb.
     (Closes: #1005955)
   * debian/watch: updated regex accordingly to new github releases location.
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