Reproducible Builds at FOSDEM 2024 Core Reproducible Builds developer Holger Levsen presented at the main track at FOSDEM on Saturday 3rd February this year in Brussels, Belgium. However, that wasn t the only talk related to Reproducible Builds. However, please see our comprehensive FOSDEM 2024 news post for the full details and links.

Maintainer Perspectives on Open Source Software Security Bernhard M. Wiedemann spotted that a recent report entitled Maintainer Perspectives on Open Source Software Security written by Stephen Hendrick and Ashwin Ramaswami of the Linux Foundation sports an infographic which mentions that 56% of [polled] projects support reproducible builds .

Three new reproducibility-related academic papers A total of three separate scholarly papers related to Reproducible Builds have appeared this month: Signing in Four Public Software Package Registries: Quantity, Quality, and Influencing Factors by Taylor R. Schorlemmer, Kelechi G. Kalu, Luke Chigges, Kyung Myung Ko, Eman Abdul-Muhd, Abu Ishgair, Saurabh Bagchi, Santiago Torres-Arias and James C. Davis (Purdue University, Indiana, USA) is concerned with the problem that:

Package maintainers can guarantee package authorship through software signing [but] it is unclear how common this practice is, and whether the resulting signatures are created properly. Prior work has provided raw data on signing practices, but measured single platforms, did not consider time, and did not provide insight on factors that may influence signing. We lack a comprehensive, multi-platform understanding of signing adoption and relevant factors. This study addresses this gap. (arXiv, full PDF)

Reproducibility of Build Environments through Space and Time by Julien Malka, Stefano Zacchiroli and Th o Zimmermann (Institut Polytechnique de Paris, France) addresses:

[The] principle of reusability [ ] makes it harder to reproduce projects build environments, even though reproducibility of build environments is essential for collaboration, maintenance and component lifetime. In this work, we argue that functional package managers provide the tooling to make build environments reproducible in space and time, and we produce a preliminary evaluation to justify this claim.

The abstract continues with the claim that Using historical data, we show that we are able to reproduce build environments of about 7 million Nix packages, and to rebuild 99.94% of the 14 thousand packages from a 6-year-old Nixpkgs revision. (arXiv, full PDF)
Options Matter: Documenting and Fixing Non-Reproducible Builds in Highly-Configurable Systems by Georges Aaron Randrianaina, Djamel Eddine Khelladi, Olivier Zendra and Mathieu Acher (Inria centre at Rennes University, France):

This paper thus proposes an approach to automatically identify configuration options causing non-reproducibility of builds. It begins by building a set of builds in order to detect non-reproducible ones through binary comparison. We then develop automated techniques that combine statistical learning with symbolic reasoning to analyze over 20,000 configuration options. Our methods are designed to both detect options causing non-reproducibility, and remedy non-reproducible configurations, two tasks that are challenging and costly to perform manually. (HAL Portal, full PDF)

Mailing list highlights From our mailing list this month:

• User cen posted a query asking How to verify a package by rebuilding it locally on Debian which received a followup from Vagrant Cascadian.
• James Addison asked Two questions about build-path reproducibility in Debian regarding the differences in the testing performed by Debian s GitLab continuous integration (CI) pipeline and the Debian-specific testing performed by the Reproducible Builds project itself, and followed this with a separate but related question regarding misconfigured reprotest configurations.

Distribution work In Debian this month, 5 reviews of Debian packages were added, 22 were updated and 8 were removed this month adding to Debian s knowledge about identified issues. A number of issue types were updated as well. [ ][ ][ ][ ] In addition, Roland Clobus posted his 23rd update of the status of reproducible ISO images on our mailing list. In particular, Roland helpfully summarised that all major desktops build reproducibly with bullseye, bookworm, trixie and sid provided they are built for a second time within the same DAK run (i.e. [within] 6 hours) and that there will likely be further work at a MiniDebCamp in Hamburg. Furthermore, Roland also responded in-depth to a query about a previous report
Fedora developer Zbigniew J drzejewski-Szmek announced a work-in-progress script called fedora-repro-build that attempts to reproduce an existing package within a koji build environment. Although the projects README file lists a number of fields will always or almost always vary and there is a non-zero list of other known issues, this is an excellent first step towards full Fedora reproducibility.
Jelle van der Waa introduced a new linter rule for Arch Linux packages in order to detect cache files leftover by the Sphinx documentation generator which are unreproducible by nature and should not be packaged. At the time of writing, 7 packages in the Arch repository are affected by this.
Elsewhere, Bernhard M. Wiedemann posted another monthly update for his work elsewhere in openSUSE.

diffoscope diffoscope is our in-depth and content-aware diff utility that can locate and diagnose reproducibility issues. This month, Chris Lamb made a number of changes such as uploading versions 256, 257 and 258 to Debian and made the following additional changes:

• Use a deterministic name instead of trusting gpg s use-embedded-filenames. Many thanks to Daniel Kahn Gillmor dkg@debian.org for reporting this issue and providing feedback. [ ][ ]
• Don t error-out with a traceback if we encounter struct.unpack-related errors when parsing Python .pyc files. (#1064973). [ ]
• Don t try and compare rdb_expected_diff on non-GNU systems as %p formatting can vary, especially with respect to MacOS. [ ]
• Fix compatibility with pytest 8.0. [ ]
• Temporarily fix support for Python 3.11.8. [ ]
• Use the 7zip package (over p7zip-full) after a Debian package transition. (#1063559). [ ]
• Bump the minimum Black source code reformatter requirement to 24.1.1+. [ ]
• Expand an older changelog entry with a CVE reference. [ ]
• Make test_zip black clean. [ ]

In addition, James Addison contributed a patch to parse the headers from the diff(1) correctly [ ][ ] thanks! And lastly, Vagrant Cascadian pushed updates in GNU Guix for diffoscope to version 255, 256, and 258, and updated trydiffoscope to 67.0.6.

reprotest reprotest is our tool for building the same source code twice in different environments and then checking the binaries produced by each build for any differences. This month, Vagrant Cascadian made a number of changes, including:

• Create a (working) proof of concept for enabling a specific number of CPUs. [ ][ ]
• Consistently use 398 days for time variation rather than choosing randomly and update README.rst to match. [ ][ ]
• Support a new --vary=build_path.path option. [ ][ ][ ][ ]

Website updates There were made a number of improvements to our website this month, including:

• Chris Lamb:
  • Improve the relative sizing of headers. [ ]
  • Re-order and punch up the introduction and documentation on the SOURCE_DATE_EPOCH page. [ ]
  • Update SOURCE_DATE_EPOCH documentation re. datetime.datetime.fromtimestamp. Thanks, James Addison. [ ]
  • Add a post about Reproducible Builds at FOSDEM 2024. [ ]
• Holger Levsen:
  • Update the GNU Guix page to include their reproducibility QA page. [ ]
  • Add Sune Vuorela and Jan-Benedict Glaw to our contributors list. [ ][ ]
• Mattia Rizzolo:
  • Add Sovereign Tech Fund s logo to our sponsors. [ ]
  • Update our sponsors list. [ ]

Reproducibility testing framework The Reproducible Builds project operates a comprehensive testing framework (available at tests.reproducible-builds.org) in order to check packages and other artifacts for reproducibility. In February, a number of changes were made by Holger Levsen:

• Debian-related changes:
  • Temporarily disable upgrading/bootstrapping Debian unstable and experimental as they are currently broken. [ ][ ]
  • Use the 64-bit amd64 kernel on all i386 nodes; no more 686 PAE kernels. [ ]
  • Add an Erlang package set. [ ]
• Other changes:
  • Grant Jan-Benedict Glaw shell access to the Jenkins node. [ ]
  • Enable debugging for NetBSD reproducibility testing. [ ]
  • Use /usr/bin/du --apparent-size in the Jenkins shell monitor. [ ]
  • Revert reproducible nodes: mark osuosl2 as down . [ ]
  • Thanks again to Codethink, for they have doubled the RAM on our arm64 nodes. [ ]
  • Only set /proc/$pid/oom_score_adj to -1000 if it has not already been done. [ ]
  • Add the opemwrt-target-tegra and jtx task to the list of zombie jobs. [ ][ ]

Vagrant Cascadian also made the following changes:

• Overhaul the handling of OpenSSH configuration files after updating from Debian bookworm. [ ][ ][ ]
• Add two new armhf architecture build nodes, virt32z and virt64z, and insert them into the Munin monitoring. [ ][ ] [ ][ ]

In addition, Alexander Couzens updated the OpenWrt configuration in order to replace the tegra target with mpc85xx [ ], Jan-Benedict Glaw updated the NetBSD build script to use a separate $TMPDIR to mitigate out of space issues on a tmpfs-backed /tmp [ ] and Zheng Junjie added a link to the GNU Guix tests [ ]. Lastly, node maintenance was performed by Holger Levsen [ ][ ][ ][ ][ ][ ] and Vagrant Cascadian [ ][ ][ ][ ].

Upstream patches The Reproducible Builds project detects, dissects and attempts to fix as many currently-unreproducible packages as possible. We endeavour to send all of our patches upstream where appropriate. This month, we wrote a large number of such patches, including:

• Philip Rinn:
  • gimagereader (date)
• Bernhard M. Wiedemann:
  • grass (date-related issue)
  • grub2 (filesystem ordering issue)
  • latex2html (drop a non-deterministic log)
  • mhvtl (tar)
  • obs (build-tool issue)
  • ollama (GZip embedding the modification time)
  • presenterm (filesystem-ordering issue)
  • qt6-quick3d (parallelism)
• Chris Lamb:
  • #1064506 filed against geophar.
  • #1064891 filed against pytest-repeat.
  • #1064892 filed against klepto.
• James Addison:
  • #1064519 filed against flask-limiter.
  • python-parsl-doc (disable dynamic argument evaluation by Sphinx autodoc extension)
  • python3-pytest-repeat (remove entry_points.txt creation that varied by shell)
  • python3-selinux (remove packaged direct_url.json file that embeds build path)
  • python3-sepolicy (remove packaged direct_url.json file that embeds build path)
  • #1064575 filed against pyswarms.
  • #1064638 filed against python-x2go.
  • snapd (fix timestamp header in packaged manual-page)
  • zzzeeksphinx (existing RB patch forwarded and merged (with modifications))
• Johannes Schauer Marin Rodrigues:
  • #1063939 filed against fop.

---

If you are interested in contributing to the Reproducible Builds project, please visit our Contribute page on our website. However, you can get in touch with us via:

• IRC: #reproducible-builds on irc.oftc.net.
• Twitter: @ReproBuilds
• Mastodon: @reproducible_builds@fosstodon.org
• Mailing list: rb-general@lists.reproducible-builds.org

m_foo = std::make_shared<SomeQObject>();
/* plenty of lines and function boundaries left out */ 
(void)connect(m_foo.get(), &SomeQObject::someSignal, [m_foo]()  
  /* */
 );

• Keep the connection object (QMetaObject::Connection) around and call disconnect in your destructor. That way the connection gets removed and the lamda object should get removed
• Capture the shared pointer by (const) reference. Capture the shared pointer as a weak pointer. Or as a raw pointer. All of this is safe because whenever the shared pointer gets a refcount of zero, the connection gets taken down with the object.

typedef std::tuple<std::string, QString> Element;
typedef std::vector List;
List list =   std::make_tuple("first", "second"), 
              std::make_tuple("third", "fourth")  ;
std::unique_ptr<TableModel> magic = createTableModel(list);
QTableView view;
view.setModel(magic->model());

std::unique_ptr<ListModel>List>> magic = createListModel(list);
// expose magic->model() to your quickview

Text  
    text: role0
 
Text  
    text: role1
 

auto lines =   std::make_tuple("extra", "extra"),
               std::make_tuple("extra2","extra2")  ;
magic->insertRows(1,lines.begin(), lines.end());

magic->appendRow(std::make_tuple("",""));

magic->removeRow(3,2);

List newList;
// fill list
magic->reset(newList);

for(const Element& e : magic->list())
 
    ...
 

• Sune Vuorela blogged about making Qt documentation reproducible while spending good times in the Alps.

• Scarlett Clark
• Satyam Zode

• texlive-bin/2016.20160513.41080-3 has been uploaded to unstable, featuring support for FORCE_SOURCE_DATE. See the last post for details on it.
• doxygen/1.4.4-1 has been uploaded to unstable, fixing #822197 (upstream bug), which caused some generated html file to contain unreproducible memory addresses of Python objects used at build time.
• debhelper/9.20160618 has been uploaded to unstable, fixing #824490, which instructs ant to not save the username of the build user in the generated files. Original patch by Emmanuel Bourg.
• HW42 reported a long-known (although only internally) bug in our dpkg-buildinfo. this particular bug doesn't affect our current infrastructure, but it's a blocker for having .buildinfo support merged upstream.
• epydoc/3.0.1+dfsg-13 and 3.0.1+dfsg-14 have been uploaded by Kenneth J. Pronovici which fixes nondeterministic ordering issues in generated documentation and removes memory addresses. Original patches (#825968 and #827416) by Sascha Steinbiss.

• Ed Maste sent a patch to have ELF Tool Chain's elfcopy support SOURCE_DATE_EPOCH.
• Ed Maste changed FreeBSD's ar(1) to have a reproducible output by default when invoked with -s.
• Ed Maste merged changes from NetBSD's makefs to FreeBSD's to add a command line option for setting the timestamp.
• Ed Maste reported on FreeBSD package reproducibility details from the investigation for his BSDCan talk, including diffoscope results for the non-reproducible packages.
• Holger Levsen spent some time thinking and documenting how to store package notes and issues in a multi-distribution friendly manner, so that we can share these issues and notes between reproducible efforts across different projects. Thoughts we had about this topic during the Athens meeting last December are included in the updated README.

• adios/1.9.0-10 by Alastair McKinstry.
• airstrike/0.99+1.0pre6a-8 by Markus Koschany, original patch by Reiner Herrmann.
• apt-dater/1.0.3-1 by Patrick Matth i, original patch by Chris Lamb.
• bitlbee/3.4.2-1 by Jelmer Vernoo .
• dar/2.5.5-1 by Laszlo Boszormenyi.
• fastjet/3.0.6+dfsg-2 by Mattia Rizzolo, original patch by Maria Valentina Marin.
• libretro-beetle-pce-fast/0.9.38.7+git20160609-1 by S rgio Benjamim, original patch by Reiner Herrmann.
• libretro-beetle-psx/0.9.38.6+git20151019-2 by S rgio Benjamim, original patch by Reiner Herrmann.
• mx/1.99.4-1 by Ying-Chun Liu.
• python-coverage/4.1+dfsg.1-1 by Ben Finney.
• shiro/1.2.5-1 by Tony Mancill, original patch by Chris Lamb.
• splix/2.0.0+svn315-5 by Didier Raboud.
• u-boot/2016.07~rc1+dfsg1-3 by Vagrant Cascadian, debugging and patch by HW42, patches submitted upstream.

• gcc-mingw-w64/18 by Stephen Kitt.
• gnuplot/5.0.3+dfsg3-6 by Anton Gladky, original patch by Alexis Bienven e.

• ruby2.3/2.3.1-3 by Christian Hofstaedtler, avoids unreproducible rbconfig.rb files by always using bash for building.

• #827109 against asciijump by Reiner Herrmann: sort source files for deterministic linking order.
• #827112 against boswars by Reiner Herrmann: sort source files for deterministic linking order.
• #827114 against overgod by Reiner Herrmann: use C locale for sorting source files.
• #827115 against netpbm by Alexis Bienven e: honour SOURCE_DATE_EPOCH while generating output.
• #827124 against funguloids by Reiner Herrmann: use C locale for sorting files.
• #827145 against scummvm by Reiner Herrmann: don't embed extra fields in zip archive and build with proper host architecture.
• #827150 against netpanzer by Reiner Herrmann: sort source files for deterministic linking order.
• #827172 against reaver by Alexis Bienven e: sort object files for deterministic linking order.
• #827187 against latex2html by Alexis Bienven e: iterate deterministic over Perl hashes; honour SOURCE_DATE_EPOCH for output; strip username from output; sort index keys.
• #827313 against cherrypy3 by Sascha Steinbiss: prevent memory addresses in output.
• #827361 against matplotlib by Alexis Bienven e: honour SOURCE_DATE_EPOCH in output and sort keys while iterating over dict.
• #827382 against dwarfutils by Reiner Herrmann: fix array size, which caused memory from outside a table to be embedded into output.
• #827384 against skytools3 by Sascha Steinbiss: use stable sorting order and remove timestamps from documentation.
• #827419 against ldaptor by Sascha Steinbiss: sort list of input files and prevent home directory from leaking into documentation.
• #827546 against git-buildpackage by Sascha Steinbiss: replace timestamps in documentation with changelog date; prevent temporary paths in documentation.
• #827572 against xprobe by Reiner Herrmann: sort list of object files in static library archives.

• Mattia Rizzolo uploaded pbuilder 0.225 to unstable, providing built-in support for eatmydata. We're planning to use it in armhf and i386 builders where we don't build in tmpfs, to increase the build speed some more.
• Valery Young reworked the appearance of the package page, hopefully making them more intuitive and usable. In the process she changed the script generating them to use a real templating system, thus improving maintenance for the future.
• Holger adjusted the scheduler to reschedule packages in state 'depwait' after two days instead of three.
• Mattia added the bug title next to the bug numbers in the notes.

strcpy_s(dest, strlen(src),src);

#include <utility>
template <typename T> auto foo(const T& t) -> decltype(x.first)

return t.first;

int main()

foo(std::make_pair(1,2));
return 0;

main.cpp(8): error C2672: foo : no matching overloaded function found
main.cpp(8): error C2893: Failed to specialize function template unknown-type foo(const T &)

2 : error: x was not declared in this scope
template <typename T> auto foo(const T& t) -> decltype(x.first)

2 : error: use of undeclared identifier x
template <typename T> auto foo(const T& t) -> decltype(x.first)

example.cpp(2): error: identifier x is undefined
template <typename T> auto foo(const T& t) -> decltype(x.first)

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