Tag Archives: linux

Virtual Developers Conference by the MSCC

The virtual Developers Conference of the Mauritius Software Craftsmanship Community was live streamed on YouTube on the 9th, 10th and 11th of September 2020. It connected 90 speakers from different parts of the world, not the Mauritius, with hundreds of viewers that showed interest in the various topics.

Dubbed as DevCon, the conference is undoubtedly the biggest event for developers, engineers, sysadmins, designers, bloggers, students and many other enthusiasts in Mauritius. Look for the hashtag #devconmu on Twitter and Facebook and I am pretty you will find out many nice comments about the conference.

Despite technical issues with the sound quality and lags on the live stream on the first day, the team didn't give up and worked harder. The second and third days went on pretty smooth.

I co-hosted in the Kryptone stream. All four streams had comics-themed names, Batcave, Avengers Tower, New Asgard and Kryptone. Each stream had a two hosts, one of them also having the role of director to switch scenes for the live stream.

Comics-themed YouTube live streams
Comics-themed YouTube live streams

After having processed all the recordings individual sessions will be uploaded on the MSCC YouTube channel.

The past years we had great fun in attending the Developers Conference, meet friends, have a beer and rejoice. The pandemic brought sudden changes in how we organise things and a virtual conference in Mauritius was definitely a new thing. No one in the organising team is a professional videographer and yet with a little tinkering we were able to record and live stream this conference. Hosting and directing for nine hours during three days was tiring but still we all had a blast during these days. 🥳

Sandeep Ramgolam blogged about his share of experience during the virtual Developers Conference.

The next event, also a virtual one, by the Mauritius Software Craftsmanship Community, will be the DevFest Mauritius. It is scheduled for November but no date has been set yet.

Stasiek Michalski wins the race for the openSUSE Board

The openSUSE Ad-hoc Board Election is now concluded.

Stasiek Michalski has been elected to join the openSUSE Board. The complete result is as follows:

  • Stasiek Michalski — 160 votes
  • Pierre Böckmann — 70 votes

234 out of 510 eligible members have cast their vote in this election. We recorded 4 blank votes.

We thank both of them for stepping up and running in this election and we congratulate Stasiek for his win.

Lastly, thanks to Edwin Zakaria and Ariez Vachha for their help in the planning of this election.

openSUSE Ad-hoc Board Election 2020

Back in February 2020 Christian Boltz resigned from the openSUSE Board explaining the reasons behind his decision on the project mailing list. His resignation came about two weeks after Sarah Julia Kriesch's resignation from the Board.

The openSUSE Board was left with two vacant seats to be filled. Sarah had been a board member for just about a few weeks after the 2019-2020 board elections. After her resignation, the openSUSE Board decided to appoint Vinzenz Vietzke on the board based on the results of the 2019-2020 board elections. Following that, only one seat remained vacant on the board. However, before the Election Committee could start discussions for an election to fill that vacant seat, about two weeks after Vinzenz's appointment, openSUSE member Pierre Böckmann called for a No-Confidence vote against the current board. It was unprecedented in the community and that put things on halt for a while.

The board election rules state that:

If 20 per cent or more of the openSUSE members require a new board, an election will be held for the complete elected Board seats.

The Election Committee was tasked to find out whether 20% of the community is indeed calling for a re-election. At this point I should disclose that I am an election official in the openSUSE Election Committee and the task given to us was not easy. After much consultation, we finally came up with a way to "measure" this 20% requirement of the election rule. We set up an electronic petition using the voting platform that is used for openSUSE Board elections.

A few days ago the petition ended and the result showed that only 11.6% of the community was in favour of a re-election. That does not satisfy the requirement for a forced re-election and thus an ad-hoc election will be carried to fill the one vacant seat only.

Ariez Vachha announced the ad-hoc board election schedule on the project mailing list and details are also available on the openSUSE wiki.

Starting now and until the 2nd of August openSUSE members wishing to run for this election or nominate someone from the community can do so by sending an email to election-officials@opensuse.org. I wish to remind that only openSUSE members can run for board candidacy and vote in this election.

The Election Committee is composed of Ariez Vachha, Edwin Zakaria and myself.

Podman – unable to pull image

Today, while pulling the latest Nextcloud container image from the docker.io repository I noticed that it is failing. Looking at the read: connection reset by peer error I assume it could be primarily due to network failure; maybe poor quality of the connection.

Note that Mauritius is far from "everywhere" else and connectivity issues are nothing new.

ish@coffee-bar:~> podman pull docker.io/library/nextcloud
Trying to pull docker.io/library/nextcloud...
Getting image source signatures
Copying blob e0276193a084 done  
Copying blob eb2d00c10344 done  
Copying blob 3a60f364b0c5 done  
Copying blob e0d3d1244592 done  
Copying blob f54006e0dc29 done  
Copying blob 8559a31e96f4 done  
Copying blob b22875b95a2a done  
Copying blob f65316e96b10 done  
Copying blob 3e309988c00b done  
Copying blob 0c78caf16ec3 [======================================] 13.1MiB / 13.2MiB
Copying blob 4fc30aae7ee5 done  
Copying blob 37b016cacdc6 done  
Copying blob fd56bf3cc539 done  
Copying blob e3cd35f544b5 done  
Copying blob 467fea8f6f80 done  
Copying blob 0dc7444f9282 done  
Copying blob 547ae6684264 done  
Copying blob 3139b6de5be7 done  
Copying blob 00e77223b529 done  
Copying blob 2b37e3b3a856 done  
  read tcp 192.168.100.6:33536->104.18.124.25:443: read: connection reset by peer
Error: error pulling image "docker.io/library/nextcloud": unable to pull docker.io/library/nextcloud: unable to pull image: Error writing blob: error storing blob to file "/var/tmp/storage720474498/10": read tcp 192.168.100.6:33536->104.18.124.25:443: read: connection reset by peer

Podman does not retry to copy the image in case of failures.

A few days ago there was a suggestion to implement a similar feature in Podman that is present in Buildah, which provides the image copy retry functionality.

For the curious, the implementation can be seen here.

Container images that are pulled by Buildah are stored in the local repository which can also by accessed by Podman, so that's an advantage. I tried pulling the Nextcloud container image using Buildah and it completed successfully.

ish@coffee-bar:~> buildah pull nextcloud
Getting image source signatures
Copying blob e0d3d1244592 done  
Copying blob 8559a31e96f4 done  
Copying blob eb2d00c10344 done  
Copying blob 3a60f364b0c5 done  
Copying blob f54006e0dc29 done  
Copying blob e0276193a084 done  
Copying blob f65316e96b10 done  
Copying blob b22875b95a2a done  
Copying blob 3e309988c00b done  
Copying blob 0c78caf16ec3 done  
Copying blob 4fc30aae7ee5 done  
Copying blob 37b016cacdc6 done  
Copying blob e3cd35f544b5 done  
Copying blob fd56bf3cc539 done  
Copying blob 467fea8f6f80 done  
Copying blob 0dc7444f9282 done  
Copying blob 547ae6684264 done  
Copying blob 2b37e3b3a856 done  
Copying blob 00e77223b529 done  
Copying blob 3139b6de5be7 done  
Copying config 327476ebe3 done  
Writing manifest to image destination
Storing signatures
327476ebe3280c7b570d8463edd136956eab120959976b643cb7dbfaa73f98c1

Now, the downloaded container image is also accessible by Podman.

ish@coffee-bar:~> podman images
REPOSITORY                     TAG      IMAGE ID       CREATED        SIZE
docker.io/libreoffice/online   latest   0586fecfa3c1   28 hours ago   2.84 GB
docker.io/library/nextcloud    latest   327476ebe328   3 days ago     774 MB

To conclude, while we are waiting that a retryCopyImage function is available in Podman, we can use Buildah to pull container images that are troublesome due to network issues.

A quick intro to Podman by Estu Fardani

Estu Fardani is a helpful & jovial fellow whom I met at the openSUSE Asia Summit last year in Bali, Indonesia. Recently, for the openSUSE Virtual Summit, Estu did a short presentation on Podman. His presentation video is available on YouTube and slides deck available on Google Slides.

While I am not a fan of alias docker=podman I believe Estu added that part in his slide below to make the Podman transition a bit smoother for users already familiar with Docker commands.

Slide from Estu's presentation

Note that the latest release of openSUSE Leap, i.e version 15.2, comes with support for Podman through the libcontainers-common package.

Previously, if one needed to experiment with Podman and/or deploy in production then openSUSE Tumbleweed, Kubic or MicroOS were the supported choices. Now, one may deploy Podman containers on their existing Leap infrastructure (after upgrading to the latest version 15.2).

कुछ बातें openSUSE Leap 15.2 के बारे में जानें

२ जुलाई २०२० को openSUSE Leap 15.2 संस्करण उपलब्ध हुआ।

openSUSE Leap एक निशुल्क और लिनक्स-आधारित ऑपरेटिंग सिस्टम है जो आप अपने पीसी, लैपटॉप या सर्वर पर इस्तेमाल कर सकते है। Leap 15.2 और SUSE Linux Enterprise एक समान कोडबेस उपयोग करते है जिस से openSUSE Leap 15.2 की स्थिरता और ज्यादा मज़बूत होती है।

यह विशेष संस्करण कृत्रिम बुद्धिमत्ता, यानी आर्टिफिशियल इंटेलिजेंस, को अधिक आसानी से सुलभ बनाता है। निम्नलिखित पैकेज ऑफिशल रिपॉजिटरीज से प्राप्त किए जा सकते हैं।

इस संस्करण में अधिक कंटेनर टूलस् शामिल है, जैसे कि कुबनेटिस् (जो पहली बार के लिए Leap संस्करण में उपलब्ध हुआ है) हेल्म और सिल्यम

Convert .VOB files to .MP4

I had a bunch of video files in the .VOB format which I copied from a few DVDs a couple of years back. Uploading them on a cloud storage service (e.g Google Drive, OneDrive etc) for safe keeping is nice but not practical since they cannot be played directly through the cloud service's video player. The latter would play .MP4 video files.

FFMPEG comes handy here to convert the video files.

ffmpeg -i bla.vob -b:v 3000k -b:a 256k bla.mp4

I used mediainfo to find the maximum video & audio bit rate.

mediainfo bla.vob

Running Puddletag on Linux distributions with limited Python 2 support

I am a big fan of Puddletag, an audio tag editor for Linux similar to the Mp3tag Windows program. As seen above, Puddletag uses a spreadsheet-like layout which makes it quite unique in the Linux world and matches 100% with how I like tagging to be. Puddletag and I are on the same wavelength and I have been using it for some years now to curate my extensive music collection.

Unfortunately, Puddletag was written in Python 2 and relies on a number of Python 2 libraries. When I upgraded to Fedora Linux 32 a few days ago, I lost a number of those libraries as well as Puddletag (as Python 2 reached its end of life (EOL) on 1st January 2020).

Fortunately, the Linux community came to the rescue and created a corresponding AppImage which works on all new Linux distributions like Fedora 32 or Ubuntu 20.04. Get the AppImage here courtesy of Patsim and have fun!

I’ve tested it in Fedora Linux 32 and it works great!

Libreoffice with Flatpak: Adding dictionaries for other languages

I generally write in either English, French or Mauritian Kreol.

I also use Libreoffice when I need a word processor or a spreadsheet (or, even, sometimes, a drawing software). Lately, I have discovered Flatpak (“The Future of Apps on Linux”) and Flathub (“An App Store for Linux”) and I am sold. Installing the latest version of Libreoffice from Flathub using Flatpak is a simple:

$ flatpak install flathub org.libreoffice.LibreOffice

I have noticed though that this command tends to only install the English dictionaries for spellchecking. I didn’t know how to install more dictionaries to Libreoffice so I asked on the official Flathub forum. And, fortunately, someone from the community pointed me towards the solution. The idea is to get some information about the Libreoffice installation:

$ flatpak info org.libreoffice.LibreOffice

LibreOffice - The LibreOffice productivity suite

ID: org.libreoffice.LibreOffice
Ref: app/org.libreoffice.LibreOffice/x86_64/stable
Arch: x86_64
Branch: stable
Version: 6.4.3.2
License: MPL-2.0
Origin: flathub
Collection: org.flathub.Stable
Installation: system
Installed: 686.0MB
Runtime: org.freedesktop.Platform/x86_64/19.08
Sdk: org.freedesktop.Sdk/x86_64/19.08

Commit: ddcb114395acb30f633a06fd065598ace0fbe4330c49a784a50911b0222f5f95
Parent: fa891c405f685f7859e2bb623b29db5cdb3e9e1d80d8c31f30a5d21edcc9a3eb
Subject: Update to libreoffice-6.4.3.2 (5a34256e) Date: 2020-04-16 18:32:28 +0000

Notice that the runtime is org.freedesktop.Platform/x86_64/19.08 which implies that org.freedesktop.Platform.Locale/x86_64/19.08 contains all the dictionaries. But, as pointed out by stbergmann in the forum,

The *.Locale extensions are special, in that flatpak by default only downloads that part of such an extension that matches the users current system locale, while the –reinstall hack unconditionally downloads all of it. There obviously needs to be usability improvements here, as this appears to be a common issue for users.

And this is the –reinstall hack he is talking about:

$ flatpak install --reinstall flathub org.freedesktop.Platform.Locale/x86_64/19.08

and, after a few seconds, the dictionary issue is cured. Now, in addition to English, you have French plus all the other languages. Enjoy :-)

Managing the Linux /home directory is about to change

systemd 245 came out on the 6th of March 2020.

In this release, among many changes brought, a notable one is that regarding how we see and think of the Linux /home directory. A new service systemd-homed.service has been added, whose role is to manage home directories.

Traditionally, user information on Linux systems have recorded in the /etc/passwd and /etc/shadow files. The former contains details about the user name, id, group id, shell, home directory, among other details, while the latter contains the user password information.

On the other hand systemd-homed.service stores user information in a ~/.identity file in JSON format. The choice of JSON was mainly due to its popularity and easiness to process with the majority of programming languages.

Thus, every directory managed by systemd-homed.service contains both the user information and the user data.

To create, remove or change home directories one would use the homectl command.

$ sudo homectl create john --real-name="John Doe" -G wheel --disk-size=500M

What if you could carry your home directory in a pendrive and work from any (Linux) machine as if you are "home" ?

$ sudo homectl create john --real-name="John Doe" --image-path=/dev/disk/by-id/usb-SanDisk_Ultra_Fit_476fff954b2b5c44-0:0 --tasks-max=500

The above command creates the user john in a pendrive and assigns a maximum of 500 concurrent task to him.

systemd-homed.service also allows you to have an encrypted home directory, but that, I will write about on another day. 😉


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