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Programming Leftovers

Submitted by Roy Schestowitz on Sunday 24th of July 2022 12:18:51 AM Filed under
Development

  • Toolbx — bypassing the immutability of OCI containers | Debarshi's den

    OCI containers are famous for being immutable. Once a container has been created with podman create, it’s attributes can’t be changed anymore. For example, the bind mounts, the environment variables, the namespaces being used, and all the other attributes that can be specified via options to the podman create command. This means that once there’s a Toolbx, it wouldn’t be possible to give it access to a new set of files from the host if the need arose. The Toolbx would have to be deleted and re-created with access to the new paths.

    This is a problem, because a Toolbx is where the user sets up her development and troubleshooting environment. Re-creating a Toolbx might mean reinstalling a number of different packages, tweaking configuration files, redeploying various artifacts and so on. Having to repeat all that in the middle of a long hacking session, just because the container’s attributes need to be tweaked, can be annoying.

    This is unlike Flatpak containers, where it’s possible to override the permissions of a Flatpak either persistently through flatpak override or temporarily during flatpak run.

    Secondly, as the Toolbx code evolves, we want to be able to transparently update existing Toolbxes to enable new features and fix bugs. It would be a real drag if users had to consciously re-create their containers.

  • GSOC 2022: Second Update

    In my previous blog post, I mentioned using the GtkListView for the templates submenu. But, after a few discussions with my mentor @antoniof, we decided to use the GtkListBox to create the custom widget for the new documents creation feature, as it would be easier to implement and there is no need to create a factory for it.

  • Planet Grep now running PtLink

    Almost 2 decades ago, Planet Debian was created using the "planetplanet" RSS aggregator. A short while later, I created Planet Grep using the same software.

    Over the years, the blog aggregator landscape has changed a bit. First of all, planetplanet was abandoned, forked into Planet Venus, and then abandoned again. Second, the world of blogging (aka the "blogosphere") has disappeared much, and the more modern world uses things like "Social Networks", etc, making blogs less relevant these days.

    A blog aggregator community site is still useful, however, and so I've never taken Planet Grep down, even though over the years the number of blogs that was carried on Planet Grep has been reducing. In the past almost 20 years, I've just run Planet Grep on my personal server, upgrading its Debian release from whichever was the most recent stable release in 2005 to buster, never encountering any problems.

    That all changed when I did the upgrade to Debian bullseye, however. Planet Venus is a Python 2 application, which was never updated to Python 3. Since Debian bullseye drops support for much of Python 2, focusing only on Python 3 (in accordance with python upstream's policy on the matter), that means I have had to run Planet Venus from inside a VM for a while now, which works as a short-term solution but not as a long-term one.

  • Looking at project resource use and CI pipelines in GitLab | Philip Withnall

    While at GUADEC I finished a small script which uses the GitLab API to estimate the resource use of a project on GitLab. It looks at the CI pipeline job durations and artifact storage for the project and its forks over a given period, and totals things.

    [...]

    If total pipeline durations are long, either reduce the number of pipeline jobs or speed them up. Speeding them up almost always has no downsides. Reducing the number of jobs is a tradeoff between convenience of development and resource usage. Two ideas for reducing the number of jobs are to make some jobs manual-only, if they are very unlikely to find problems. Or run them on a schedule rather than on every commit, if it’s OK for them to catch problems up to a week after they’re introduced.

    If total artifact storage use is high, store fewer artifacts, or expire them after a week (or so). They are likely not so useful after that point anyway.

    If artifacts are being used to cache build dependencies, then consider moving those dependencies into a pre-built container image instead. It may be cached better between CI runners.

  • Best Alternatives to PhpStorm (Paid & Free) | TechRepublic

    Software development with the PHP programming language is a venture many developers enjoy as long as they have the right integrated development environment (IDE) solution. Among many IDEs available to PHP developers, PhpStorm stands out as one of the most adopted IDEs in software development companies; however, there are alternatives to PhpStorm available for PHP developers to explore. Here is a breakdown of the best PhpStorm alternative to help you make a choice, if you need to expand your IDE tools.

  • Integrated Inconsistencies. | Saif [blogs.perl.org]

    I will get it wrong. I will start off by saying that, not just because I am married and this sentiment has been conjugally programmed in me for years, but because doing things "my way" will not suit everybody. We approach life, programming, drawing from different perspectives, different analogies, and one method however disagreeable to one person, may be perfectly logical to another. Even our own actions and analysis show conflicts. Take a cup of tea. I drink from the top of the cup, but measure from the bottom. Take character position in programming code...we measure lines from the top, then character on that line. But when we write, we write one line at a time, populating columns in a line before going to the next line.

    The same applies to drawing onto a screen. The reason I want to draw on a screen is because I want to be able to draw charts...following the example of Descartes, one plots a point on X,Y coordinates with the origin on the bottom left hand corner. x comes before y. The same screen is drawn from top to bottom, and the print coordinates are described as row, column. with the origin at top left. Then examine what happens if I were to draw an SVG graph according to the Perl Weekly Challenge 165 by Ryan Thompson. How many people realised that the SVG coordinate system the x,y coordinates are not the same as Cartesian coordinates? You did? Well done!...but I dare say plenty of people didn't.

»

More in Tux Machines

today's howtos

  • How to Change Comment Color in Vim – Fix Unreadable Blue Color

    Are you annoyed about the comment color in vim? The dark blue color of the comment is often hard to read. In this tutorial, we learn how to change the comment color in Vim. There are few methods we can use to look vim comment very readable.

  • How to Add Repository to Debian

    APT checks the health of all the packages, and dependencies of the package before installing it. APT fetches packages from one or more repositories. A repository (package source) is basically a network server. The term "package" refers to an individual file with a .deb extension that contains either all or part of an application. The normal installation comes with default repositories configured, but these contain only a few packages out of an ocean of free software available. In this tutorial, we learn how to add the package repository to Debian.

  • Making a Video of a Single Window

    I recently wanted to send someone a video of a program doing some interesting things in a single X11 window. Recording the whole desktop is easy (some readers may remember my post on Aeschylus which does just that) but it will include irrelevant (and possibly unwanted) parts of the screen, leading to unnecessarily large files. I couldn't immediately find a tool which did what I wanted on OpenBSD [1] but through a combination of xwininfo, FFmpeg, and hk I was able to put together exactly what I needed in short order. Even better, I was able to easily post-process the video to shrink its file size, speed it up, and contort it to the dimension requirements of various platforms. Here's a video straight out of the little script I put together: [...]

  • Things You Can And Can’t Do

    And it got me thinking about what you can and can’t do — what you do and don’t have control over.

  • allow-new-zones in BIND 9.16 on CentOS 8 Stream under SELinux

    We run these training systems with SELinux enabled (I wouldn’t, but my colleague likes it :-), and that’s the reason I aborted the lab: I couldn’t tell students how to solve the cause other than by disabling SELinux entirely, but there wasn’t enough time for that.

  • Will the IndieWeb Ever Become Mainstream?

    This is an interesting question, thanks for asking it, Jeremy. I do have some history with the IndieWeb, and some opinions, so let’s dive in.

    The short answer to the question is a resounding no, and it all boils down to the fact that the IndieWeb is really complicated to implement, so it will only ever appeal to developers.

  • How to Install CUPS Print Server on Ubuntu 22.04

    If your business has multiple personal computers in the network which need to print, then we need a device called a print server. Print server act intermediate between PC and printers which accept print jobs from PC and send them to respective printers. CUPS is the primary mechanism in the Unix-like operating system for printing and print services. It can allow a computer to act as a Print server. In this tutorial, we learn how to set up CUPS print server on Ubuntu 22.04.

Open Hardware: XON/XOFF and Raspberry Pi Pico

  • From XON/XOFF to Forward Incremental Search

    In the olden days of computing, software flow control with control codes XON and XOFF was a necessary feature that dumb terminals needed to support. When a terminal received more data than it could display, there needed to be a way for the terminal to tell the remote host to pause sending more data. The control code 19 was chosen for this. The control code 17 was chosen to tell the remote host to resume transmission of data.

  • Raspberry Pi Pico Used in Plug and Play System Monitor | Tom's Hardware

    Dmytro Panin is at it again, creating a teeny system monitor for his MacBook from scratch with help from our favorite microcontroller, the Raspberry Pi Pico. This plug-and-play system monitor (opens in new tab) lets him keep a close eye on resource usage without having to close any windows or launch any third-party programs. The device is Pico-powered and plugs right into the MacBook to function. It has a display screen that showcases a custom GUI featuring four bar graphs that update in real-time to show the performance of different components, including the CPU, GPU, memory, and SSD usage. It makes it possible to see how hard your PC is running at a glance.

Security Leftovers

How to Apply Accent Colour in Ubuntu Desktop

A step-by-step tutorial on how to apply accent colour in Ubuntu desktop (GNOME) with tips for Kubuntu and others. Read more

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