FLOSS Project Planets

We are happy to announce the release of GNU Taler v0.13.

GNUnet 0.22.0 released

We are pleased to announce the release of GNUnet 0.22.0.
GNUnet is an alternative network stack for building secure, decentralized and privacy-preserving distributed applications. Our goal is to replace the old insecure Internet protocol stack. Starting from an application for secure publication of files, it has grown to include all kinds of basic protocol components and applications towards the creation of a GNU internet.

This is a new major release. It breaks protocol compatibility with the 0.21.x versions. Please be aware that Git master is thus henceforth (and has been for a while) INCOMPATIBLE with the 0.21.x GNUnet network, and interactions between old and new peers will result in issues. In terms of usability, users should be aware that there are still a number of known open issues in particular with respect to ease of use, but also some critical privacy issues especially for mobile users. Also, the nascent network is tiny and thus unlikely to provide good anonymity or extensive amounts of interesting information. As a result, the 0.22.0 release is still only suitable for early adopters with some reasonable pain tolerance .

Download links

• gnunet-0.22.0.tar.gz ( signature )
• gnunet-0.22.0-meson.tar.gz ( signature ) NEW: Test tarball made using the meson build system.
• gnunet-gtk-0.22.0.tar.gz ( signature )
• gnunet-fuse-0.22.0.tar.gz ( signature )

The GPG key used to sign is: 3D11063C10F98D14BD24D1470B0998EF86F59B6A

Note that due to mirror synchronization, not all links might be functional early after the release. For direct access try http://ftp.gnu.org/gnu/gnunet/

Changes

A detailed list of changes can be found in the git log , the NEWS and the bug tracker . Noteworthy highlights are

• transport :
  • A new experimental HTTP/3 communicator for peer-to-peer transport communicator.
  • New experimental NAT traversal functionality.
• util :
  • An implementation of Hybrid Public Key Encryption (HPKE) and related KEMs which are now used across the stack.
  • An implementation of Elligator used as part of our Diffie-Hellman exchanges and KEMs
• hostlist : The bootstrap URL is changed to https://bootstrap.gnunet.org/v22 and https://bootstrap.gnunet.org/latest for the release and development version (git head), respectively.
• gnunet-hello : A new CLI to import/export connectivity information (HELLOs) of peers manually.
• namestore : Significant zone import performance improvements in preparation for DNS TLD mirror deployments (.se, .nu, etc) .
• messenger :
  • Implementation of discourse subscriptions for live data streaming in chat rooms.
  • New functionality in CLI for the Messenger service to stream data via standard input and output.
• Build System :
  • Build variant to build a monolithic GNUnet library.
  • Cross compile the monolithic library for use on Android devices. An Android prototype can be found in this repository.

Known Issues

• There are known major design issues in the CORE subsystems which will need to be addressed in the future to achieve acceptable usability, performance and security.
• There are known moderate implementation limitations in CADET that negatively impact performance.
• There are known moderate design issues in FS that also impact usability and performance.
• There are minor implementation limitations in SET that create unnecessary attack surface for availability.
• The RPS subsystem remains experimental.

In addition to this list, you may also want to consult our bug tracker at bugs.gnunet.org which lists about 190 more specific issues.

Thanks

This release was the work of many people. The following people contributed code and were thus easily identified: Christian Grothoff, t3sserakt, TheJackiMonster, Pedram Fardzadeh, Shichao, fence, dvn, nullptrderef and Martin Schanzenbach.

Screen is a full-screen window manager that multiplexes a physical
terminal between several processes, typically interactive shells.

The 5.0.0 release includes the following changes to the previous
release 4.9.1:

• Rewritten authentication mechanism
• Add escape %T to show current tty for window
• Add escape %O to show number of currently open windows
• Use wcwdith() instead of UTF-8 hard-coded tables
• New commands:

  - auth [on|off]
    Provides password protection
  - status [top|up|down|bottom] [left|right]
    The status window by default is in bottom-left corner.
    This command can move status messages to any corner of the screen.
  - truecolor [on|off]
  - multiinput
    Input to multiple windows at the same time

• Removed commands:

  - time
  - debug
  - password
  - maxwin
  - nethack

• Fixes:

  - Screen buffers ESC keypresses indefinitely
  - Crashes after passing through a zmodem transfer
  - Fix double -U issue

Release is available for download:
https://ftp.gnu.org/gnu/screen/

Please report any bugs or regressions.
Thanks to everyone who contributed to this release.

Cheers,
Alex

An explanation of Python's two number types (integers and floating point numbers), supported arithmetic operations, and an explanation of operator precedence.

Table of contents

1. Integers
2. Floating point numbers
3. Mixing integers and floating point numbers
4. Arithmetic operations
5. Operator precedence in Python
6. Arithmetic in Python is similar to in math

Integers

Integers are used for representing whole numbers.

>>> 5 5 >>> 0 0 >>> 999999999999 999999999999 >>> -10 -10

Any number that doesn't have a decimal point in it is an integer.

Floating point numbers

Floating point numbers are used …

Read the full article: https://www.pythonmorsels.com/arithmetic-in-python/

We Updated the Drupal User Guide for Drupal 11

Drupal 11 was released recently. Yay. And with it comes a bunch of minor (and sometimes major) changes to the way Drupal works and the need to update the documentation to reflect those changes.

joe Wed, 08/28/2024 - 15:35

Five Ideas for the Drupal Association mherchel Wed, 08/28/2024 - 15:50

Exciting news! Tag1 Consulting is proud to be a module sponsor at DrupalCon Barcelona 2024. Join us from September 24-27 for four days of Drupal innovation, collaboration, and community spirit. Our team will be presenting on Gander, Drupal Core development, LMS, DDEV, and more.

Read more Hank Wed, 08/28/2024 - 10:14

In this article, we delve into the process of migrating Drupal fields, building on the knowledge from previous discussions about Drupal fields and their database structures. We begin by addressing the two key components of field migrations: storage and instance settings. This is the first step in a multi-stage migration process that will ultimately involve four different migrations.

Read more mauricio Wed, 08/28/2024 - 07:41

Scrapy is a robust Python web scraping framework that can manage requests asynchronously, follow links, and parse site content. To store scraped data, you can use MongoDB, a scalable NoSQL database, that stores data in a JSON-like format. Combining Scrapy with MongoDB offers a powerful solution for web scraping projects, leveraging Scrapy’s efficiency and MongoDB’s flexible data storage.

In this tutorial, you’ll learn how to:

• Set up and configure a Scrapy project
• Build a functional web scraper with Scrapy
• Extract data from websites using selectors
• Store scraped data in a MongoDB database
• Test and debug your Scrapy web scraper

If you’re new to web scraping and you’re looking for flexible and scalable tooling, then this is the right tutorial for you. You’ll also benefit from learning this tool kit if you’ve scraped sites before, but the complexity of your project has outgrown using Beautiful Soup and Requests.

To get the most out of this tutorial, you should have basic Python programming knowledge, understand object-oriented programming, comfortably work with third-party packages, and be familiar with HTML and CSS.

By the end, you’ll know how to get, parse, and store static data from the Internet, and you’ll be familiar with several useful tools that allow you to go much deeper.

Get Your Code: Click here to download the free code that shows you how to gather Web data with Scrapy and MongoDB.

Take the Quiz: Test your knowledge with our interactive “Web Scraping With Scrapy and MongoDB” quiz. You’ll receive a score upon completion to help you track your learning progress:

Interactive Quiz

Web Scraping With Scrapy and MongoDB

In this quiz, you'll test your understanding of web scraping with Scrapy and MongoDB. You'll revisit how to set up a Scrapy project, build a functional web scraper, extract data from websites, store scraped data in MongoDB, and test and debug your Scrapy web scraper.

Prepare the Scraper Scaffolding

You’ll start by setting up the necessary tools and creating a basic project structure that will serve as the backbone for your scraping tasks.

While working through the tutorial, you’ll build a complete web scraping project, approaching it as an ETL (Extract, Transform, Load) process:

• Extract data from the website using a Scrapy spider as your web crawler.
• Transform this data, for example by cleaning or validating it, using an item pipeline.
• Load the transformed data into a storage system like MongoDB with an item pipeline.

Scrapy provides scaffolding for all of these processes, and you’ll tap into that scaffolding to learn web scraping following the robust structure that Scrapy provides and that numerous enterprise-scale web scraping projects rely on.

Note: In a Scrapy web scraping project, a spider is a Python class that defines how to crawl a specific website or a group of websites. It contains the logic for making requests, parsing responses, and extracting the desired data.

First, you’ll install Scrapy and create a new Scrapy project, then explore the auto-generated project structure to ensure that you’re well-equipped to proceed with building a performant web scraper.

Install the Scrapy Package

To get started with Scrapy, you first need to install it using pip. Create and activate a virtual environment to keep the installation separate from your global Python installation. Then, you can install Scrapy:

Shell (venv) $ python -m pip install scrapy Copied!

After the installation is complete, you can verify it by running the scrapy command and viewing the output:

Shell (venv) $ scrapy Scrapy 2.11.2 - no active project Usage: scrapy <command> [options] [args] Available commands: bench Run quick benchmark test fetch Fetch a URL using the Scrapy downloader genspider Generate new spider using pre-defined templates runspider Run a self-contained spider (without creating a project) settings Get settings values shell Interactive scraping console startproject Create new project version Print Scrapy version view Open URL in browser, as seen by Scrapy [ more ] More commands available when run from project directory Use "scrapy <command> -h" to see more info about a command Copied!

The command-line (CLI) program should display the help text of Scrapy. This confirms that you installed the package correctly. You’ll next run the highlighted startproject command to create a project.

Create a Scrapy Project

Scrapy is built around projects. Generally, you’ll create a new project for each web scraping project that you’re working on. In this tutorial, you’ll work on scraping a website called Books to Scrape, so you can call your project books.

As you may have already identified in the help text, the framework provides a command to create a new project:

Shell (venv) $ scrapy startproject books Copied! Read the full article at https://realpython.com/web-scraping-with-scrapy-and-mongodb/ »

[ Improve Your Python With 🐍 Python Tricks 💌 – Get a short & sweet Python Trick delivered to your inbox every couple of days. >> Click here to learn more and see examples ]

Drupal GovCon wrapped up with actionable insights from Rod Martin on non-coding solutions for site builders and Bree Benesh on navigating leadership challenges. Explore their sessions for practical strategies to apply in your Drupal projects.

We are looking for the next group of organizers to own and lead the 2026 DjangoCon Europe conference. Could your town - or your football stadium, circus tent, private island or city hall - host this wonderful community event?

DjangoCon Europe is a major pillar of the Django community, as people from across the world meet and share. This includes many qualities that make it a unique event - unconventional and conventional venues, creative happenings, a feast of talks and a dedication to inclusion and diversity.

Hosting a DjangoCon is an ambitious undertaking. It's hard work, but each year it has been successfully run by a team of community volunteers, not all of whom have had previous experience - more important is enthusiasm, organizational skills, the ability to plan and manage budgets, time and people - and plenty of time to invest in the project.

For 2026, we want to kickstart the organization much earlier than in previous years to allow more flexibility for the organizing team, and open up more opportunities for support from our DjangoCon Europe support working group.

Step 1: Submit your expression of interest

If you’re considering organizing DjangoCon Europe (🙌 great!), fill in our DjangoCon Europe 2026 expression of interest form with your contact details. No need to fill in all the information at this stage if you don’t have it all already, we’ll reach out and help you figure it out.

Express your interest in organizing

Step 2: We’re here to help!

We've set up a DjangoCon Europe support working group of previous organizers that you can reach out to with questions about organizing and running a DjangoCon Europe.

The group will be in touch with everyone submitting the expression of interest form, or you can reach out to them directly: european-organizers-support@djangoproject.com

We'd love to hear from you as soon as possible, so your proposal can be finalized and sent to the DSF board by October 6th 2024. The selected hosts will be publicly announced at DjangoCon Europe 2025 by the current organizers.

Step 3: Submitting the proposal

The more detailed and complete your final proposal is, the better. Basic details include:

• Organizing committee members: You won’t have a full team yet, probably, naming just some core team members is enough.
• The legal entity that is intended to run the conference: Even if the entity does not exist yet, please share how you are planning to set it up.
• Dates: See “What dates are possible in 2026?” below. We must avoid conflicts with major holidays, EuroPython, DjangoCon US, and PyCon US.
• Venue(s), including size, number of possible attendees, pictures, accessibility concerns, catering, etc.
• Transport links and accommodation: Can your venue be reached by international travelers?
• Budgets and ticket prices: Talk to the DjangoCon Europe Support group to get help with this, including information on past event budgets.

We also like to see:

• Timelines
• Pictures
• Plans for online participation, and other ways to make the event more inclusive and reduce its environmental footprint
• Draft agreements with providers
• Alternatives you have considered

Have a look at our proposed DjangoCon Europe 2026 Licensing Agreement for the fine print on contractual requirements and involvement of the Django Software Foundation.

Submit your completed proposal by October 6th 2024 via our DjangoCon Europe 2026 expression of interest form, this time filling in as many fields as possible. We look forward to reviewing great proposals that continue the excellence the whole community associates with DjangoCon Europe.

Q&A Can I organize a conference alone?

We strongly recommend that a team of people submit an application.

I/we don’t have a legal entity yet, is that a problem?

Depending on your jurisdiction, this is usually not a problem. But please share your plans about the entity you will use or form in your application.

Do I/we need experience with organizing conferences?

The support group is here to help you succeed. From experience, we know that many core groups of 2-3 people have been able to run a DjangoCon with guidance from previous organizers and help from volunteers.

What is required in order to announce an event?

Ultimately, a contract with the venue confirming the dates is crucial, since announcing a conference makes people book calendars, holidays, buy transportation and accommodation etc. This, however, would only be relevant after the DSF board has concluded the application process. Naturally, the application itself cannot contain any guarantees, but it’s good to check concrete dates with your venues to ensure they are actually open and currently available, before suggesting these dates in the application.

Do we have to do everything ourselves?

No. You will definitely be offered lots of help by the community. Typically, conference organizers will divide responsibilities into different teams, making it possible for more volunteers to join. Local organizers are free to choose which areas they want to invite the community to help out with, and a call will go out through a blog post announcement on djangoproject.com and social media.

What kind of support can we expect from the Django Software Foundation?

The DSF regularly provides grant funding to DjangoCon organizers, to the extent of $6,000 in recent editions. We also offer support via specific working groups:

• The dedicated DjangoCon Europe support working group.
• The social media working group can help you promote the event.
• The Code of Conduct working group works with all event organizers.

In addition, a lot of Individual Members of the DSF regularly volunteer at community events. If your team aren’t Individual Members, we can reach out to them on your behalf to find volunteers.

What dates are possible in 2026?

For 2026, DjangoCon Europe should happen between January 5th and April 27th, or June 4th and June 28th. This is to avoid the following community events’ provisional dates:

• PyCon US 2026: May 2026
• EuroPython 2026: July 2026
• DjangoCon US 2026: September - October 2026
• DjangoCon Africa 2026: August - September 2026

We also want to avoid the following holidays:

• New Year's Day: Wednesday 1st January 2026
• Chinese New Year: Tuesday 17th February 2026
• Eid Al-Fitr: Friday 20th March 2026
• Passover: Wednesday 1st - Thursday 9th April 2026
• Easter: Sunday 5th April 2026
• Eid Al-Adha: Tuesday 26th - Friday 29th May 2026
• Rosh Hashanah: Friday 11th - Sunday 13th September 2026
• Yom Kippur: Sunday 20th - Monday 21st September 2026

What cities or countries are possible?

Any city in Europe. This can be a city or country where DjangoCon Europe has happened in the past (Vigo, Edinburgh, Porto, Copenhagen, Heidelberg, Florence, Budapest, Cardiff, Toulon, Warsaw, Zurich, Amsterdam, Berlin), or a new locale.

References Past calls

• Interested in organizing DjangoCon Europe 2016?
• Could you host DjangoCon Europe 2017?
• DjangoCon Europe 2019 - where will it be?
• Could you host DjangoCon Europe 2023?
• Last Chance for a DjangoCon Europe 2023

PyPy v7.3.17: release of python 2.7 and 3.10

The PyPy team is proud to release version 7.3.17 of PyPy.

This release includes a new RISC-V JIT backend, an improved REPL based on work by the CPython team, and better JIT optimizations of integer operations. Special shout-outs to Logan Chien for the RISC-V backend work, to Nico Rittinghaus for better integer optimization in the JIT, and the CPython team that has worked on the repl.

The release includes two different interpreters:

• PyPy2.7, which is an interpreter supporting the syntax and the features of Python 2.7 including the stdlib for CPython 2.7.18+ (the + is for backported security updates)

• PyPy3.10, which is an interpreter supporting the syntax and the features of Python 3.10, including the stdlib for CPython 3.10.14.

The interpreters are based on much the same codebase, thus the dual release. This is a micro release, all APIs are compatible with the other 7.3 releases. It follows after 7.3.16 release on April 23, 2024.

We recommend updating. You can find links to download the releases here:

https://pypy.org/download.html

We would like to thank our donors for the continued support of the PyPy project. If PyPy is not quite good enough for your needs, we are available for direct consulting work. If PyPy is helping you out, we would love to hear about it and encourage submissions to our blog via a pull request to https://github.com/pypy/pypy.org

We would also like to thank our contributors and encourage new people to join the project. PyPy has many layers and we need help with all of them: bug fixes, PyPy and RPython documentation improvements, or general help with making RPython's JIT even better.

If you are a python library maintainer and use C-extensions, please consider making a HPy / CFFI / cppyy version of your library that would be performant on PyPy. In any case, both cibuildwheel and the multibuild system support building wheels for PyPy.

RISC-V backend for the JIT

PyPy's JIT has added support for generating 64-bit RISC-V machine code at runtime (RV64-IMAD, specifically). So far we are not releasing binaries for any RISC-V platforms, but there are instructions on how to cross-compile binaries.

REPL Improvements

The biggest user-visible change of the release is new features in the repl of PyPy3.10. CPython 3.13 has adopted and extended PyPy's pure-Python repl, adding a number of features and fixing a number or bugs in the process. We have backported and added the following features:

• Prompts and tracebacks use terminal colors, as well as terminal hyperlinks for file names.

• Bracketed paste enable pasting several lines of input into the terminal without auto-indentation getting in the way.

• A special interactive help browser (F1), history browser (F2), explicit paste mode (F3).

• Support for Ctrl-<left/right> to jump over whole words at a time.

See the CPython documentation for further details. Thanks to Łukasz Langa, Pablo Galindo Salgado and the other CPython devs involved in this work.

Better JIT optimizations of integer operations

The optimizers of PyPy's JIT have become much better at reasoning about and optimizing integer operations. This is done with a new "knownbits" abstract domain. In many programs that do bit-manipulation of integers, some of the bits of the integer variables of the program can be statically known. Here's a simple example:

x = a | 1 ... if x & 1: ... else: ...

With the new abstract domain, the JIT can optimize the if-condition to True, because it already knows that the lowest bit of x must be set. This optimization applies to all Python-integers that fit into a machine word (PyPy optimistically picks between two different representations for int, depending on the size of the value). Unfortunately there is very little impact of this change on almost all Python code, because intensive bit-manipulation is rare in Python. However, the change leads to significant performance improvements in Pydrofoil (the RPython-based RISC-V/ARM emulators that are automatically generated from high-level Sail specifications of the respective ISAs, and that use the RPython JIT to improve performance).

PyPy versions and speed.pypy.org

The keen-eyed will have noticed no mention of Python version 3.9 in the releases above. Typically we will maintain only one version of Python3, but due to PyPy3.9 support on conda-forge we maintained multiple versions from the first release of PyPy3.10 in PyPy v7.3.12 (Dec 2022). Conda-forge is sunsetting its PyPy support, which means we can drop PyPy3.9. Since that was the major driver of benchmarks at https://speed.pypy.org, we revamped the site to showcase PyPy3.9, PyPy3.10, and various versions of cpython on the home page. For historical reasons, the "baseline" for comparison is still cpython 3.7.19.

We will keep the buildbots building PyPY3.9 until the end of August, these builds will still be available on the nightly builds tab of the buildbot.

What is PyPy?

PyPy is a Python interpreter, a drop-in replacement for CPython It's fast (PyPy and CPython performance comparison) due to its integrated tracing JIT compiler.

We also welcome developers of other dynamic languages to see what RPython can do for them.

We provide binary builds for:

• x86 machines on most common operating systems (Linux 32/64 bits, Mac OS 64 bits, Windows 64 bits)

• 64-bit ARM machines running Linux (aarch64) and macos (macos_arm64).

PyPy supports Windows 32-bit, Linux PPC64 big- and little-endian, Linux ARM 32 bit, RISC-V RV64IMAFD Linux, and s390x Linux but does not release binaries. Please reach out to us if you wish to sponsor binary releases for those platforms. Downstream packagers provide binary builds for debian, Fedora, conda, OpenBSD, FreeBSD, Gentoo, and more.

What else is new?

For more information about the 7.3.17 release, see the full changelog.

Please update, and continue to help us make pypy better.

Cheers, The PyPy Team

Qt for MCUs 2.5.4 LTS (Long-Term Support) has been released and is available for download. This patch release provides bug fixes and other improvements while maintaining source compatibility with Qt for MCUs 2.5. It does not add any new functionality.

por Paulo Henrique de Lima Santana (phls)

Listamos abaixo os links para os relatos e notícias do Debian Day 2024 realizado em Belém e Poços de Caldas:

• Belém - PA
• Poços de Caldas - MG

Setting up a multilingual website in Drupal opens the door to a global online marketplace, allowing businesses to reach different cultural audiences by presenting content in multiple languages. In this article, we will discuss the process of configuring a multilingual site on Drupal.

Greetings, Pythonistas- thank you so much for supporting the work of the Python Software Foundation (PSF) and the Python community! The current PSF Board has decided to invest more in connecting and serving the global Python community by establishing a forum to have regular conversations. The board members of the PSF with the support of PSF staff are excited to introduce monthly PSF Board Office Hours on the PSF Discord. The Office Hours will be sessions where you can share with us how we can help your community, express your perspectives, and provide feedback for the PSF.

What are the PSF Board Office Hours?

Similar to the PSF Grants Program Office Hours where PSF staff members help to answer questions regarding the PSF Grants Program, during the PSF Board Office Hours you can participate in a text-based live chat with PSF Board Directors. This is a chance to connect, share, and collaborate with the PSF Board and staff to improve our community together. Occasionally, we will have dedicated topics such as PyCon US and the PSF Board Elections for the office hour sessions.

Here is some of the work that we collaborate with staff and volunteers on:

• Promotion and outreach for the Python programming language
• Supporting local Python communities
• Organizing PyCon US
• Diversity and Inclusion in our community
• Support handling of Code of Conduct within our communities
• Support regional Python communities via the PSF Grants Program
• Furthering the mission of the PSF

Unless we have a dedicated topic for a session, you are not limited to talking with us about the above topics, although the discussions should be focused on Python, the PSF, and our community. If you think there’s something we can help with or we should know, we welcome you to come and talk to us!

Joining the office hours

The office hour sessions will take place on the PSF Discord server in the #psf-board channel. If you are new to Discord, make sure to check out a tutorial on how you can download the Discord app and sign up for free– then join us on the PSF Discord! To make the office hours more accessible, the office hours will be scheduled at alternating times so no matter where you are based, you can find a time that is most convenient for you! Here is a list of the dates and times:

• September 10th, 2024: 1pm UTC
• October 8th, 2024: 9pm UTC
• November 12th, 2024: 2pm UTC
• December 10th, 2024: 9pm UTC
• January 14th, 2025: 2pm UTC
• February 11th, 2025: 9pm UTC
• March 11th, 2025: 1pm UTC
• April 8th, 2025:  9pm UTC
• May 13th, 2025: 1pm UTC (Live from PyCon US!)
• June 10th, 2025: 9pm UTC
• July 9th, 2025:  1pm UTC
• August 12th, 2025: 9pm UTC

Each session lasts for an hour. Make sure to check what time these sessions are for you locally so you don't miss out! Sessions after August 13th, 2025, will be announced in the future.
 

Who will be at the office hours?

Some of the board members of the PSF will be attending each office hour, as well as members of the PSF Staff. The list of the PSF Board Directors can be found on our website. We are passionate Python community members who are happy to listen, help, and provide support to you. We are happy to follow up with you if there are any issues we cannot address immediately during the office hour sessions. As always, you can email us at psf-board@python.org with inquiries, feedback, or comments at any time.

A while ago a colleague of mine asked about our crash infrastructure in Plasma and whether I could give some overview on it. This seems very useful to others as well, I thought. Here I am, telling you all about it!

Our crash infrastructure is comprised of a number of different components.

• KCrash: a KDE Framework performing crash interception and prepartion for handover to…
• coredumpd: a systemd component performing process core collection and handover to…
• DrKonqi: a GUI for crashes sending data to…
• Sentry: a web service and UI for tracing and presenting crashes for developers

We’ve looked at KCrash previously. This time we look at coredumpd.

Coredumpd

coredumpd collects all crashes happening on the system, through the core_pattern system. It is shipped as part of systemd and as such mostly available out of the box.

It is fairly sophisticated and can manage the backlog of crashes, so old crashes get cleaned out from time to time. It also tightly integrates with journald giving us a well-defined interface to access crash metadata.

But before we dive into the inner workings of coredumpd, let’s talk about cores.

What are cores?

A core, or more precisely: a core dump file, is a copy of the memory image of a process and its process status (registers, mappings, etc.) in a file. Simply put, it’s like we took a copy of the running process from RAM and stored it in a file. The purpose of such a core is that it allows us to look at a snapshot of the process at that point in time without having the process still running. Using this data, we can perform analysis of the process to figure out what exactly went wrong and how we ended up in that situation.

The advantage is that since the process doesn’t need to be running anymore, we can investigate crashes even hours or days after they happened. That is of particular use when things crash while we are not able to deal with them immediately. For example if Plasma were to crash on logout there’d be no way to deal with it besides stopping the logout, which may not even be possible anymore. Instead we let the crash drop into coredumpd, let it collect a core file, and on next login we can tell the user about the crash.

With that out of the way, it’s time to dump a core!

Core Dumps

We already talked about KCrash and how it intercepts crashes to write some metadata to disk. Once it is done it calls raise() to generate one of those core dumps we just discussed. This actually very briefly turns over control to the kernel which will more or less simply invoke the defined core_pattern process. In our case, coredumpd.

coredumpd will immediately systemd-socket-activate itself and forward the data received from the kernel. In other words: it will start an instance of systemd-coredump@.service and the actual processing will happen in there. The advantage of this is that regular systemd security configuration can be applied as well as cgroup resource control and all that jazz — the core dumping happens in a regular systemd service.

The primary task here is to actually write the dump to a file. In addition, coredumpd will also collect lots of additional metadata besides what is in the core already. Most notably various bits and pieces of /proc information such as cgroup information, mount information, the auxillary vector (auxv), etc.

Once all the data is collected a journald entry is written and the systemd-coredump@.service instance quits again.

The journal entry will contain the metadata as entry fields as well as the path of the core dump on disk, so we can later access it. It essentially serves as a key-value store for the crash data. A severely shortened version looks like this:

Tue 2024-08-27 17:52:27.593233 CEST […] COREDUMP_UID=60106 COREDUMP_GID=60106 COREDUMP_SIGNAL_NAME=SIGSYS COREDUMP_SIGNAL=31 COREDUMP_TIMESTAMP=1724773947000000 COREDUMP_COMM=wine64 COREDUMP_FILENAME=/var/lib/systemd/coredump/core.wine64.….zst … Example

Since this is all rather abstract, we can look at a trivial example to illustrate things a bit better.

Let’s open two terminals. In the first we can watch the journal for the crash to appear.

journalctl -xef SYSLOG_IDENTIFIER=systemd-coredump

In the second terminal we run an instance of sleep in the background, and then trigger a segmentation fault crash.

sleep 99999999999& kill -SEGV $!

In the first terminal you’ll see the crash happening:

Aug 27 15:01:49 ajax systemd-coredump[35535]: Process 35533 (sleep) of user 60106 terminated abnormally with signal 11/SEGV, processing... Aug 27 15:01:49 ajax systemd-coredump[35549]: [🡕] Process 35533 (sleep) of user 60106 dumped core. Stack trace of thread 35533: #0 0x0000729f1b961dc0 n/a (/lib/ld-linux-x86-64.so.2 + 0x1cdc0) ELF object binary architecture: AMD x86-64

So far so interesting. “But where is the additional data from /proc hiding?” you might wonder. We need to look at the verbose entry to see all data.

journalctl -o verbose SYSLOG_IDENTIFIER=systemd-coredump

This actually already concludes coredumpd’s work. In the next post DrKonqi will step onto the stage.

#644 – AUGUST 27, 2024
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Exploring Astrophysics in Python With pandas and Matplotlib

This course uses three problems often covered in introductory astro-physics courses to play in Python. Along the way you’ll learn some astronomy and how to use a variety of datascience libraries like NumPy, Matplotlib, pandas, and pint.
REAL PYTHON course

What’s the Deal With setup.py, pyproject.toml and Wheels?

Packaging in Python has a bit of a history and if you’ve come across the variety of ways of specifying and building packages you might wonder “why?” This article gives you the history and current best practices.
BITECODE

Accelerate Your Data Science Workflows End-to-End Self-Paced Course

Discover how to create, accelerate, and deploy data pipelines with RAPIDS for GPU-accelerated data science workflows. Take this course for free when you join the NVIDIA Developer Program →
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How to Build a Query Language in Python

This guide walks you through how to build a custom query language in Python. The example given is a language to search through song lyrics.
JAMES G

Quiz: Python’s Built-in Exceptions

REAL PYTHON

Quiz: Getting Started With Testing in Python

REAL PYTHON

Articles & Tutorials Build a Blog Using Django, GraphQL, and Vue

In this step-by-step project, you’ll build a blog from the ground up. You’ll turn your Django blog data models into a GraphQL API and consume it in a Vue application for users to read. You’ll end up with an admin site and a user-facing site you can continue to refine for your own use.
REAL PYTHON

Exploring Robotics and Python Through Electronic Projects

Are you interested in learning robotics with Python? Can physical electronics-based projects grow a child’s interest in coding? This week on the show, we speak with author Marwan Alsabbagh about his book “Build Your Own Robot - Using Python, CRICKIT, and Raspberry Pi.”
REAL PYTHON podcast

How Pre-Commit Works

As a user of pre-commit hooks, do you know what happens when you run pre-commit install or why you have to run it in the first place? How does pre-commit actually work with Git? In this article, Stefanie takes you behind the scenes of how your pre-commit setup works.
STEFANIEMOLIN.COM • Shared by Stefanie Molin

Python range(): Represent Numerical Ranges

Master the Python range() function and learn how it works under the hood. You most commonly use ranges in loops. In this tutorial, you’ll learn how to iterate over ranges but also identify when there are better alternatives.
REAL PYTHON

Practices of Reliable Software Design

The author was asked what he would considered if he wrote a in-memory cache. This article talks about the eight principles he would use, many of which he wouldn’t have considered when a younger developer.
TWO WRONGS

Python’s Preprocessor

Every now and then you hear outrageous claims such as “Python has no preprocessor”, well it is there if you’re willing to dig deep enough. Learn how to hack Python’s compile step.
PYDONG

500 Python Interpreters

Work continues on removing and/or optimizing the GIL in Python. This article gives a little history so you can better understand why the GIL is there and what changes are coming.
IZZY MUERTE

Python Top Language of 2024

“Python continues to cement its overall dominance, buoyed by things like popular libraries for hot fields such as A.I.” Read the article to see where other languages have placed.
IEEE SPECTRUM

10 Python Programming Optimization Techniques

Optimization should be your last step, but once you’re there, just what can you do? This article covers ten different techniques that address memory size and code performance.
JAMES ONONIWU

uv: Unified Python Packaging

A new release of of uv is out and it has added a lot of features. This post talks about what is new and how it can simplify your packaging process.
SIMON WILLISON

PyPI Slashes Malware Response Time

“PyPI has drastically improved its malware response times, resolving 90% of issues in under 24 hours and removing 900 projects since March 2024.”
SARAH GOODING

Projects & Code Gists-Gone, a CLI for Bulk Deleting Your Github Gists

GITHUB.COM/BEN-N93 • Shared by Ben Nour

deltadb: A Lightweight Database Built on Polars and Deltalake

GITHUB.COM/UNAME-N

django-public-admin: A Public and Read-Only Django Admin

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sqlfluff: A Modular SQL Linter and Auto-Formatter

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authentik: The Authentication Glue You Need

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Events Weekly Real Python Office Hours Q&A (Virtual)

August 28, 2024
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PyCon PL 2024

August 29 to September 1, 2024
PYCON.ORG

SPb Python Drinkup

August 29, 2024
MEETUP.COM

PythOnRio Meetup

August 31, 2024
PYTHON.ORG.BR

Melbourne Python Users Group, Australia

September 2, 2024
J.MP

EARL 2024

September 4 to September 6, 2024
DATACOVE.CO.UK

PyCon Estonia 2024

September 5 to September 7, 2024
PYCON.EE

Happy Pythoning!
This was PyCoder’s Weekly Issue #644.
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BOSTON (August 27, 2024) -- Free Software Foundation (FSF) Board Member Odile Bénassy has stepped down from the Board after four years of service.

There’s a concept that I’ve heard called by a lot of different names, but my favorite name for it is “the Highlander problem”, which refers to the catchphrase of the campy-yet-still-quite-fun Highlander movie/TV franchise. In Highlander, immortal beings secretly live amongst us and sword-fight each other in hopes of being the last one standing, who will then get to rule the world forever. And when one of them is about to eliminate another, …

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