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Paul Tagliamonte: DNSync MAC Addresses

Planet Ubuntu - Sun, 12/11/2016 - 20:30

I’ve been hacking on a project on and off for my LAN called DNSync. This will take a DNSMasq leases file and sync it to Amazon Route 53.

I’ve added a new feature, which will create A reccords for each MAC address on the LAN.

Since DNSync won’t touch CNAME records, I use CNAME records (manually) to point to the auto-synced A records for services on my LAN (such as my Projector, etc).

Since It’s easy for two machines to have the same name, I’ve decided to add A records for each MAC as well as their client name. They take the fomm of something like ab-cd-ef-ab-cd-ef.by-mac.paultag.house., which is harder to accedentally collide.

Elizabeth K. Joseph: UbuCon EU 2016

Planet Ubuntu - Sun, 12/11/2016 - 17:03

Last month I had the opportunity to travel to Essen, Germany to attend UbuCon EU 2016. Europe has had UbuCons before, but the goal of this one was to make it a truly international event, bringing in speakers like me from all corners of the Ubuntu community to share our experiences with the European Ubuntu community. Getting to catch up with a bunch of my Ubuntu colleagues who I knew would be there and visiting Germany as the holiday season began were also quite compelling reasons for me to attend.

The event formally kicked off Saturday morning with a welcome and introduction by Sujeevan Vijayakumaran, he reported that 170 people registered for the event and shared other statistics about the number of countries attendees were from. He also introduced a member of the UbPorts team, Marius Gripsgård, who announced the USB docking station for Ubuntu Touch devices they were developing, more information in this article on their website: The StationDock.

Following these introductions and announcements, we were joined by Canonical CEO Jane Silber who provided a tour of the Ubuntu ecosystem today. She highlighted the variety of industries where Ubuntu was key, progress with Ubuntu on desktops/laptops, tablets, phones and venturing into the smart Internet of Things (IoT) space. Her focus was around the amount of innovation we’re seeing in the Ubuntu community and from Canonical, and talked about specifics regarding security, updates, the success in the cloud and where Ubuntu Core fits into the future of computing.

I also loved that she talked about the Ubuntu community. The strength of local meetups and events, the free support community that spans a variety of resources, ongoing work by the various Ubuntu flavors. She also spoke to the passion of Ubuntu contributors, citing comics and artwork that community members have made, including the stunning series of release animal artwork by Sylvia Ritter from right there in Germany, visit them here: Ubuntu Animals. I was also super thrilled that she mentioned the Ubuntu Weekly Newsletter as a valuable resource for keeping up with the community, a very small group of folks works very hard on it and that kind of validation is key to sustaining motivation.

The next talk I attended was by Fernando Lanero Barbero on Linux is education, Linux is science. Ubuntu to free educational environments. Fernando works at a school district in Spain where he has deployed Ubuntu across hundreds of computers, reaching over 1200 students in the three years he’s been doing the work. The talk outlined the strengths of the approach, explaining that there was cost savings for his school and also how Ubuntu and open source software is more in line with the school values. One of the key takeaways from his experience was one that I know a lot about from our own Linux in schools experiences here in the US at Partimus: focus on the people, not the technologies. We’re technologists who love Linux and want to promote it, but without engagement, understanding and buy-in from teachers, deployments won’t be successful. A lot of time needs to be spent making assessments of their needs, doing roll-outs slowly and methodically so that the change doesn’t happen to abruptly and leave them in a lurch. He also stressed the importance of consistency with the deployments. Don’t get super creative across machines, use the same flavor for everything, even the same icon set. Not everyone is as comfortable with variation as we are, and you want to make the transition as easy as possible across all the systems.

Laura Fautley (Czajkowski) spoke at the next talk I went to, on Supporting Inclusion & Involvement in a Remote Distributed Team. The Ubuntu community itself is distributed across the globe, so drawing experience from her work there and later at several jobs where she’s had to help manage communities, she had a great list of recommendations as you build out such a team. She talked about being sensitive to time zones, acknowledgement that decisions are sometimes made in social situations rather than that you need to somehow document and share these decisions with the broader community. She was also eager to highlight how you need to acknowledge and promote the achievements in your team, both within the team and to the broader organization and project to make sure everyone feels valued and so that everyone knows the great work you’re doing. Finally, it was interesting to hear some thoughts about remote member on-boarding, stressing the need to have a process so that new contributors and team mates can quickly get up to speed and feel included from the beginning.

I went to a few other talks throughout the two day event, but one of the big reasons for me attending was to meet up with some of my long-time friends in the Ubuntu community and finally meet some other folks face to face. We’ve had a number of new contributors join us since we stopped doing Ubuntu Developer Summits and today UbuCons are the only Ubuntu-specific events where we have an opportunity to meet up.


Laura Fautley, Elizabeth K. Joseph, Alan Pope, Michael Hall

Of course I was also there to give a pair of talks. I first spoke on Contributing to Ubuntu on Desktops (slides) which is a complete refresh of a talk I gave a couple of times back in 2014. The point of that talk was to pull people back from the hype-driven focus on phones and clouds for a bit and highlight some of the older projects that still need contributions. I also spoke on Building a career with Ubuntu and FOSS (slides) which was definitely the more popular talk. I’ve given a similar talk for a couple UbuCons in the past, but this one had the benefit of being given while I’m between jobs. This most recent job search as I sought out a new role working directly with open source again gave a new dimension to the talk, and also made for an amusing intro, “I don’t have a job at this very moment …but without a doubt I will soon!” And in fact, I do have something lined up now.


Thanks to Tiago Carrondo for taking this picture during my talk! (source)

The venue for the conference was a kind of artists space, which made it a bit quirky, but I think worked out well. We had a couple social gatherings there at the venue, and buffet lunches were included in our tickets, which meant we didn’t need to go far or wait on food elsewhere.

I didn’t have a whole lot of time for sight-seeing this trip because I had a lot going on stateside (like having just bought a house!) but I did get to enjoy the beautiful Christmas Market in Essen a few of nights while I was there.

For those of you not familiar with German Christmas Markets (I wasn’t), they close roads downtown and pop up streets of wooden shacks that sell everything from Christmas ornaments and cookies to hot drinks, beers and various hot foods. We went the first night I was in town we met up with several fellow conference-goers and got some fries with mayonnaise, grilled mushrooms with Bearnaise sauce, my first taste of German Glühwein (mulled wine) and hot chocolate. The next night we went was a quick walk through the market that landed us at a steakhouse where we had a late dinner and a couple beers.

The final night we didn’t stay out late, but did get some much anticipated Spanish churros, which inexplicably had sugar rather than the cinnamon I’m used to, as well as a couple more servings of Glühwein, this time in commemorative Christmas mugs shaped like boots!


Clockwise from top left: José Antonio Rey, Philip Ballew, Michael Hall, John and Laura Fautley, Elizabeth K. Joseph

The next morning I was up bright and early to catch a 6:45AM train that started me on my three train journey back to Amsterdam to fly back to Philadelphia.

It was a great little conference and a lot of fun. Huge thanks to Sujeevan for being so incredibly welcoming to all of us, and thanks to all the volunteers who worked for months to make the event happen. Also thanks to Ubuntu community members who donate to the community fund since I would have otherwise had to self-fund to attend.

More photos from the event (and the Christmas Market!) here: https://www.flickr.com/photos/pleia2/albums/72157676958738915

Colin Watson: The sad tale of CVE-2015-1336

Planet Ubuntu - Sun, 12/11/2016 - 16:42

Today I released man-db 2.7.6 (announcement, NEWS, git log), and uploaded it to Debian unstable. The major change in this release was a set of fixes for two security vulnerabilities, one of which affected all man-db installations since 2.3.12 (or 2.3.10-66 in Debian), and the other of which was specific to Debian and its derivatives.

It’s probably obvious from the dates here that this has not been my finest hour in terms of responding to security issues in a timely fashion, and I apologise for that. Some of this is just the usual life reasons, which I shan’t bore you by reciting, but some of it has been that fixing this properly in man-db was genuinely rather complicated and delicate. Since I’ve previously advocated man-db over some of its competitors on the basis of a better security posture, I think it behooves me to write up a longer description.

I took over maintaining man-db over fifteen years ago in slightly unexpected circumstances (I got annoyed with its bug list and made a couple of non-maintainer uploads, and then the previous maintainer died, so I ended up taking over both in Debian and upstream). I was a fairly new developer at the time, and there weren’t a lot of people I could ask questions of, but I did my best to recover as much of the history as I could and learn from it. One thing that became clear very quickly, both from my own inspection and from the bug list, was that most of the code had been written in a rather more innocent time. It was absolutely riddled with dangerous uses of the shell, poor temporary file handling, buffer overruns, and various common-or-garden deficiencies of that kind. I spent several years reworking large swathes of the codebase to be more robust against those kinds of bugs by design, and for example libpipeline came out of that effort.

The most subtle and risky set of problems came from the fact that the man and mandb programs were installed set-user-id to the man user. Part of this was so that man could maintain preformatted “cat pages”, and part of it was so that users could run mandb if the system databases were out of date (this is now much less useful since most package managers, including dpkg, support some kind of trigger mechanism that can run mandb whenever new system-level manual pages are installed). One of the first things I did was to make this optional, and this has been a disabled-by-default debconf option in Debian for a long time now. But it’s still a supported option and is enabled by default upstream, and when running setuid man and mandb need to take care to drop privileges when dealing with user-controlled data and to write files with the appropriate ownership and permissions.

My predecessor had problems related to this such as Debian #26002, and one of the ways they dealt with them was to make /var/cache/man/ set-group-id root, in order that files written to that directory would have consistent group ownership. This always struck me as rather strange and I meant to do something about it at some point, but until the first vulnerability report above I regarded it as mainly a curiosity, since nothing in there was group-writeable anyway. As a result, with the more immediate aim of making the system behave consistently and dealing with bug reports, various bits of code had accreted that assumed that /var/cache/man/ would be man:root 2755, and not all of it was immediately obvious.

This interacted with the second vulnerability report in two ways. Firstly, at some level it caused it because I was dealing with the day-to-day problems rather than thinking at a higher level: a series of bugs led me down the path of whacking problems over the head with a recursive chown of /var/cache/man/ from cron, rather than working out why things got that way in the first place. Secondly, once I’d done that, I couldn’t remove the chown without a much more extensive excursion into all the code that dealt with cache files, for fear of reintroducing those bugs. So although the fix for the second vulnerability is very simple in itself, I couldn’t get there without dealing with the first vulnerability.

In some ways, of course, cat pages are a bit of an anachronism. Most modern systems can format pages quickly enough that it’s not much of an issue. However, I’m loath to drop the feature entirely: I’m generally wary of assuming that just because I have a fast system that everyone does. So, instead, I did what I should have done years ago: make man and mandb set-group-id man as well as set-user-id man, at which point we can simply make all the cache files and directories be owned by man:man and drop the setgid bit on cache directories. This should be simpler and less prone to difficult-to-understand problems.

I expect that my next substantial upstream release will switch to --disable-setuid by default to reduce exposure, though, and distributions can start thinking about whether they want to follow that (Fedora already does, for example). If this becomes widely disabled without complaints then that would be good evidence that it’s reasonable to drop the feature entirely. I’m not in a rush, but if you do need cat pages then now is a good time to write to me and tell me why.

This is the fiddliest set of vulnerabilities I’ve dealt with in man-db for quite some time, so I hope that if there are more then I can get back to my previous quick response time.

Svetlana Belkin: What Programs Do I Use: Manuskript

Planet Ubuntu - Sun, 12/11/2016 - 16:02

Like I said, I try to write fiction which I recently realized that what I was planning to write back in 2009 (gave up in 2013) is more of a Dungeons and Dragons (D&D) world/realm then an original world (now I decided to make it back to one).  But I never really had a way to organize my thoughts/parts expect with individual word processor or .txt files within folders.  I either outline or just write something down in those files.

Recently I came by a program called Manuskript, which is an Open Source clone of Scrivener.  I took the time to review it by video because I found that it would be hard to do it by text:

I have a playlist where I talk about the app along with me creating a D&D campaign with the program.

The main problem of this program that it looks like the development has stalled and maybe is already dead because, “QT Webkit is depracated [and] may have built it on dying tech” (Darrell Breeden, comments on the story on OMG! Ubuntu).  Hopefully it isn’t because none of the other suggested programs are suited for what I’m trying to do with what I’m working on.

Ross Gammon: Manual Tests of Ubuntu Studio Packages

Planet Ubuntu - Sun, 12/11/2016 - 12:51

We have been caught out a few times in the lead up to some of the recent releases of Ubuntu Studio, where we discovered very late that there were problems with a particular package. If you are an experienced Ubuntu Studio user, or you would like to begin helping out in the Ubuntu Studio Developers Team, why not start testing packages for the next release (Zesty 17.04)?

Step 1 – Install the Ubuntu Studio Development Release

It is not recommended to install the development release on a computer where you cannot afford to loose important data. In order of preference, install it on:

  1. A spare computer with lots of audio/video hardware plugged in.
  2. A spare computer.
  3. Your main desktop/laptop computer with a spare hard disk plugged in.
  4. A Virtual Machine on your main desktop/laptop (not really suitable for audio/video applications).

Instructions for installing the Ubuntu Studio Development Release can be found here.

Step 2 – Choose a package to test

The list of Test Cases for Ubuntu Studio Zesty 17.04 can be found on the QA Package Tracker.

Step 3 – Check package versions

It is a good idea to note down the version number of the package in the Ubuntu development release (you will need it when reporting any bugs you find), and also in Debian (and also upstream if you are keen). Let us in the Ubuntu Studio Development Team know if our package is way out of date so that we can look into what is blocking the newer version.

To find the version in Ubuntu use the search form at the bottom of this page. For Debian, use the search form at the bottom of this page. Make sure you search in the right distribution (Ubuntu – Zesty at the moment, Debian – unstable).

Step 4 – Run the test

Click on the package you want to test in the QA package tracker (see screenshot above), and the test case should appear.

Follow the steps of the test case. It is as simple as that. If you are an experienced user of that package, feel free to test further functions. The more bugs we find early in the release cycle, the more chance they will be fixed before the release.

Step 5 – Record the results & report bugs

For this step you will need to have a Launchpad login. Log into the package tracker. You can see the button on the above screen-shot. Record your results (hopefully a “pass”) in the bottom of the tracker. The results will be stored, so feel free to come back and test the same package later and add another result. If you spot a minor bug, then see if it has already been reported in Launchpad, and if not then report it. Add the bug number to the applicable column in your test result. If you cannot complete the test case due to a bug, please mark the test as failed (and add the bug number to the report). Feel free to add as many comments to the test result as you like. In particular, we are interested in your test environment (e.g. laptop/desktop/Virtual Machine), and the version of the package when you tested it.

Step 6 – Improve the Test Cases

If you have got this far, and finished a test, then well done and thank you! You deserve a break. But why stop there? Test a different package. We also need help maintaining the Test Cases. If you spot a mistake in a Test Case, or a note a possible improvement, then report a bug against the manual-tests in Launchpad. If you think we are missing a Test Case for an Ubuntu Studio package, then please also report a bug (after checking that there isn’t already one).

You could also help out further by actually correcting, or creating the Test Case yourself. There are excellent documents on how to do this on the QA wiki here:

Contributing Manual Test Cases


Kubuntu General News: Kubuntu and Linux Mint doing Plasma 5.8 testing

Planet Ubuntu - Sun, 12/11/2016 - 08:02

Since Linux Mint 18 KDE uses the Kubuntu Backports we both thought it would be very productive if we asked both our users to help test our work, bring Plasma 5.8 to both Xenial and Yakkety. This update will also bring updated Frameworks 5.28 and Applications 16.04.3 so your favorite applications like Dolphin, Konsole, Kate will be updated with fixes, new features.

You should have some command line knowledge before testing.
Having a quick read about how to use ppa purge is also a big plus

How to test Plasma 5.8
Plasma 5.8.4 is currently in the Kubuntu Backports Landing PPA.

If your currently on Kubuntu 16.04.1 or 16.10 you can add this ppa with Konsole:
sudo add-apt-repository ppa:kubuntu-ppa/backports-landing

Then update:
sudo apt update

Once that is complete:
sudo apt dist-upgrade

Once everything is done you can reboot.

Aurélien Gâteau: Cat Avatar Generator, the Android app!

Planet Ubuntu - Sat, 12/10/2016 - 11:02

David Revoy, the author of the amazing Pepper & Carrot webcomic, recently published an online cat avatar generator. My kids loved it, so last Sunday I took this as a pretext to do a bit of Android development by building an Android app for it.

It's a bit spartan for now since it was built in one day, but it works. You can get it on Google Play.

If you want to improve it, you can find the source code on GitHub.

Synchronizing cats is complicated

One of the things I wanted to improve was to modify the generator so that entering a name in the app would produce the same cat as David online generator. In this early version I did not copy the way the seed for the random generator is computed, because I knew it would not be enough: PHP and Java do not share the same random number generator.

This week I decided to try to extract the code used in PHP to generate random numbers so that I could re-implement it in my app. I created a PHP sample page which seeded the random generator and printed 3 numbers, then I downloaded PHP 7.1.0 source code, extracted the random code and turned it into a standalone C program doing the same thing my PHP sample page did. After a bit of tweaking I managed to get it to compile and run, but the numbers did not match what my PHP sample produced. After much head scratching and random (sic) experiments, I decided I needed more info so I recompiled PHP 7.1.0, planning to add some log output to understand what was going wrong. Once this was done, I ran my PHP sample using my recompiled PHP 7.1.0 instead of the PHP I had installed via apt... Surprise! the numbers matched my C program!

Since the PHP installed on my machine was 7.0.8, I looked at the changelog for 7.1.0, and found this:

rand() and srand() have now been made aliases to mt_rand() and mt_srand(), respectively. This means that the output for the following functions have changes: rand(), shuffle(), str_shuffle(), and array_rand().

The rationale behind this change is that the output of rand() was weak and system dependent, so did not produce consistent values when ran on different systems... still, that's annoying.

At this point, I am not sure I want to spend more time on trying to synchronize avatars.

Other possible future features

One feature I would love to add is the ability to define contact pictures in my phone based on the generator. My kids on the other hand, would like to pick avatar parts themselves. We'll see what I (or you?) decide to add next.

Jonathan Riddell: KDE neon User LTS Edition Out Now

Planet Ubuntu - Fri, 12/09/2016 - 10:04

KDE Plasma 5.8 is designated an LTS edition with bugfixes and new releases being made for 18 months (rather than the normal four months).  This will please a category of user who don’t want new features on their desktop but do want it to keep working and bugs to be removed.  Because Neon aims to service Plasma and its users in every way we have now created the KDE neon User LTS Edition.

This comes with Plasma 5.8 LTS, updated for new bug fix releases (e.g. 5.8.5 is out at the end of this month) and will not change to Plasma 5.9 when they becomes available.  A common critisism of LTS editions is that it just means users get old versions with known bugs.  KDE neon User LTS Edition comes with the latest KDE Applications and it comes with the latest KDE Frameworks release and Qt 5.7, so all the KDE software we ship is the latest stable version.  Along with other KDE neon editions we’ll also ship the HWE updates for Linux and Mesa when they become available.

For those interested in archive details it’s

deb http://archive.neon.kde.org/user/lts xenial main

Switching from User Edition to User LTS Edition archive is unsupported but will likely work.

KDE Neon is so stable I completely forgot I was using it.

A recent Reddit post gave some pleasing feedback about KDE neon, allow me the indulgence of picking some pleasing quotes from it:

I feel like the KDE neon team has done such a great job with an out-of-the-box experience with this distro that it feels insanely polished.

Jep, I’m even using KDE neon at work. I’ve been able to simply focus on my tasks, and not worry about troubleshooting the OS.

KDE neon cured my distro hopping as well.

KDE neon is the bee’s knees.

Anyone else feel this last should become an official marketing slogan?

by

David Wonderly: Hello world!

Planet Ubuntu - Fri, 12/09/2016 - 09:29

Welcome to WordPress. This is your first post. Edit or delete it, then start writing!

Ubuntu Podcast from the UK LoCo: S09E41 – Pine In The Neck - Ubuntu Podcast

Planet Ubuntu - Thu, 12/08/2016 - 08:00

It’s Season Nine Episode Forty-One of the Ubuntu Podcast! Alan Pope, Mark Johnson, Martin Wimpress and Joe Ressington are connected and speaking to your brain.

We are four once more, thanks to some help from our mate Joe!

In this week’s show:

That’s all for this week! If there’s a topic you’d like us to discuss, or you have any feedback on previous shows, please send your comments and suggestions to show@ubuntupodcast.org or Tweet us or Comment on our Facebook page or comment on our Google+ page or comment on our sub-Reddit.

Dustin Kirkland: A Touch of Class at Sir Ludovic, Bucharest, Romania

Planet Ubuntu - Thu, 12/08/2016 - 07:33
A few weeks ago, I traveled to Bucharest, Romania for a busy week of work, planning the Ubuntu 17.04 (Zesty) cycle.

I did have a Saturday and Sunday to myself, which I spent mostly walking around the beautiful, old city. After visiting the Romanian Athenaeum, I quite randomly stumbled into one truly unique experience. I passed a window shop for "Sir Ludovic Master Suit Maker" which somehow caught my eye.



I travel quite a bit on business, and you'll typically find me wearing a casual sports coat, a button up shirt, nice jeans, cowboy boots, and sometimes cuff links. But occasionally, I feel a little under-dressed, especially in New York City, where a dashing suit still rules the room.

Frankly, everything I know about style and fashion I learned from Derek Zoolander. Just kidding. Mostly.

Anyway, I owned two suits. One that I bought in 2004, for that post-college streak of weddings, and a seersucker suit (which is dandy in New Orleans and Austin, but a bit irreverent for serious client meetings on Wall Street).

So I stepped into Sir Ludovic, merely as a curiosity, and walked out with the most rewarding experience of my week in Romania. Augustin Ladar, the master tailor and proprietor of the shop, greeted me at the door. We then spent the better part of 3 hours, selecting every detail, from the fabrics, to the buttons, to the stylistic differences in the cut and the fit.




Better yet, I absorbed a wealth of knowledge on style and fashion: when to wear blue and when to wear grey, why some people wear pin stripes and others wear checks, authoritative versus friendly style, European versus American versus Asian cuts, what the heck herringbone is, how to tell if the other guy is also wearing hand tailored attire, and so on...

Augustin measured me for two custom tailored suits and two bespoke shirts, on a Saturday. I picked them up 6 days later on a Friday afternoon (paying a rush service fee).

Wow. Simply, wow. Splendid Italian wool fabric, superb buttons, eye-catching color shifting inner linings, and an impeccably precise fit.









I'm headed to New York for my third trip since, and I've never felt more comfortable and confident in these graceful, classy suits. A belated thanks to Augustin. Fabulous work!



Cheers,
Dustin

Alessio Treglia: The new professionals of the interconnected world

Planet Ubuntu - Thu, 12/08/2016 - 07:02

There is an empty chair at the conference table of business professionals, a not assigned place that increasingly demands for the presence of a new type of integration manager. The demands for an ever-increasing specialization, imposed by the modern world, are bringing out with great emphasis the need for an interdisciplinary professional who understands the demands of specialists and who is able to coordinate and to link actions and decisions. This need, often still ignored, is a direct result of the growing complexity of the modern world and the fast communications inside the network.

Complexity” is undoubtedly the most suitable paradigm to characterize the historical and social model of today’s world, in which the interactions and connections between the various areas now form an inextricable network of relations. Since the ’60s and’ 70s a large group of scholars – including the chemist Ilya Prigogine and the physicist Murray Gell-Mann – began to study what would become a true Science of Complexity.

Yet this is not an entirely new concept: the term means “composed of several parts connected to each other and dependent on each other“, exactly as reality, nature, society, and the environment around us. A “complex” mode of thought integrates and considers all contexts, interconnections, interrelationships between the different realities as part of the vision.

What is professionalism? And who are professionals? What can define a professional? <…>

<Read More…[by Fabio Marzocca]>

Nathan Haines: UbuCon Europe 2016

Planet Ubuntu - Wed, 12/07/2016 - 22:04
UbuCon Europe 2016

If there is one defining aspect of Ubuntu, it's community. All around the world, community members and LoCo teams get together not just to work on Ubuntu, but also to teach, learn, and celebrate it. UbuCon Summit at SCALE was a great example of an event that was supported by the California LoCo Team, Canonical, and community members worldwide coming together to make an event that could host presentations on the newest developer technologies in Ubuntu, community discussion roundtables, and a keynote by Mark Shuttleworth, who answered audience questions thoughtfully, but also hung around in the hallway and made himself accessible to chat with UbuCon attendees.

Thanks to the Ubuntu Community Reimbursement Fund, the UbuCon Germany and UbuCon Paris coordinators were able to attend UbuCon Summit at SCALE, and we were able to compare notes, so to speak, as they prepared to expand by hosting the first UbuCon Europe in Germany this year. Thanks to the community fund, I also had the immense pleasure of attending UbuCon Europe. After I arrived, Sujeevan Vijayakumaran picked me up from the airport and we took the train to Essen, where we walked around the newly-opened Weihnachtsmarkt along with Philip Ballew and Elizabeth Joseph from Ubuntu California. I acted as official menu translator, so there were no missed opportunities for bratwurst, currywurst, glühwein, or beer. Happily fed, we called it a night and got plenty of sleep so that we would last the entire weekend long.

UbuCon Europe was a marvelous experience. Friday started things off with social events so everyone could mingle and find shared interests. About 25 people attended the Zeche Zollverein Coal Mine Industrial Complex for a guided tour of the last operating coal extraction and processing site in the Ruhr region and was a fascinating look at the defining industry of the Ruhr region for a century. After that, about 60 people joined in a special dinner at Unperfekthaus, a unique location that is part creative studio, part art gallery, part restaurant, and all experience. With a buffet and large soda fountains and hot coffee/chocolate machine, dinner was another chance to mingle as we took over a dining room and pushed all the tables together in a snaking chain. It was there that some Portuguese attendees first recognized me as the default voice for uNav, which was something I had to get used to over the weekend. There's nothing like a good dinner to get people comfortable together, and the Telegram channel that was established for UbuCon Europe attendees was spread around.

The main event began bright and early on Saturday. Attendees were registered on the fifth floor of Unpefekthaus and received their swag bags full of cool stuff from the event sponsors. After some brief opening statements from Sujeevan, Marcus Gripsgård announced an exciting new Kickstarter campaign that will bring an easier convergence experience to not just most Ubuntu phones, but many Android phones as well. Then, Jane Silber, the CEO of Canonical, gave a keynote that went into detail about where Canonical sees Ubuntu in the future, how convergence and snaps will factor into future plans, and why Canonical wants to see one single Ubuntu on the cloud, server, desktop, laptop, tablet, phone, and Internet of Things. Afterward, she spent some time answering questions from the community, and she impressed me with her willingness to answer questions directly. Later on, she was chatting with a handful of people and it was great to see the consideration and thought she gave to those answers as well. Luckily, she also had a little time to just relax and enjoy herself without the third degree before she had to leave later that day. I was happy to have a couple minutes to chat with her.

Microsoft Deutschland GmbH sent Malte Lantin to talk about Bash on Ubuntu on Windows and how the Windows Subsystem for Linux works, and while jokes about Microsoft and Windows were common all weekend, everyone kept their sense of humor and the community showed the usual respect that’s made Ubuntu so wonderful. While being able to run Ubuntu software natively on Windows makes many nervous, it also excites others. One thing is for sure: it’s convenient, and the prospect of having a robust terminal emulator built right in to Windows seemed to be something everyone could appreciate.

After that, I ate lunch and gave my talk, Advocacy for Advocates, where I gave advice on how to effectively recommend Ubuntu and other Free Software to people who aren’t currently using it or aren’t familiar with the concept. It was well-attended and I got good feedback. I also had a chance to speak in German for a minute, as the ambiguity of the term Free Software in English disappears in German, where freies Software is clear and not confused with kostenloses Software. It’s a talk I’ve given before and will definitely give again in the future.

After the talks were over, there was a raffle and then a UbuCon quiz show where the audience could win prizes. I gave away signed copies of my book, Beginning Ubuntu for Windows and Mac Users, in the raffle, and in fact I won a “xenial xeres” USB drive that looks like an origami squirrel as well as a Microsoft t-shirt. Afterwards was a dinner that was not only delicious with apple crumble for desert, but also free beer and wine, which rarely detracts from any meal.

Sunday was also full of great talks. I loved Marcos Costales’s talk on uNav, and as the video shows, I was inspired to jump up as the talk was about to begin and improvise the uNav-like announcement “You have arrived at the presentation.” With the crowd warmed up from the joke, Marcos took us on a fascinating journey of the evolution of uNav and finished with tips and tricks for using it effectively. I also appreciated Olivier Paroz’s talk about Nextcloud and its goals, as I run my own Nextcloud server. I was sure to be at the UbuCon Europe feedback and planning roundtable and was happy to hear that next year UbuCon Europe will be held in Paris. I’ll have to brush up on my restaurant French before then!

That was the end of UbuCon, but I hadn’t been to Germany in over 13 years so it wasn’t the end of my trip! Sujeevan was kind enough to put up with me for another four days, and he accompanied me on a couple shopping trips as well as some more sightseeing. The highlight was a trip to the Neanderthal Museum in the aptly-named Neandertal, Germany, and then afterward we met his friend (and UbuCon registration desk volunteer!) Philipp Schmidt in Düsseldorf at their Weihnachtsmarkt, where we tried the Feuerzangenbowle, where mulled wine is improved by soaking a block of sugar in rum, then putting it over the wine and lighting the sugarloaf on fire to drip into the wine. After that, we went to the Brauerei Schumacher where I enjoyed not only Schumacher Alt beer, but also the Rhein-style sauerbraten that has been on my to-do list for a decade and a half. (Other variations of sauerbraten—not to mention beer—remain on the list!)

I’d like to thank Sujeevan for his hospitality on top of the tremendous job that he, the German LoCo, and the French LoCo exerted to make the first UbuCon Europe a stunning success. I’d also like to thank everyone who contributed to the Ubuntu Community Reimbursement Fund for helping out with my travel expenses, and everyone who attended, because of course we put everything together for you to enjoy.

St&eacute;phane Graber: Running snaps in LXD containers

Planet Ubuntu - Wed, 12/07/2016 - 07:37

Introduction

The LXD and AppArmor teams have been working to support loading AppArmor policies inside LXD containers for a while. This support which finally landed in the latest Ubuntu kernels now makes it possible to install snap packages.

Snap packages are a new way of distributing software, directly from the upstream and with a number of security features wrapped around them so that these packages can’t interfere with each other or cause harm to your system.

Requirements

There are a lot of moving pieces to get all of this working. The initial enablement was done on Ubuntu 16.10 with Ubuntu 16.10 containers, but all the needed bits are now progressively being pushed as updates to Ubuntu 16.04 LTS.

The easiest way to get this to work is with:

  • Ubuntu 16.10 host
  • Stock Ubuntu kernel (4.8.0)
  • Stock LXD (2.4.1 or higher)
  • Ubuntu 16.10 container with “squashfuse” manually installed in it
Installing the nextcloud snap

First, lets get ourselves an Ubuntu 16.10 container with “squashfuse” installed inside it.

lxc launch ubuntu:16.10 nextcloud lxc exec nextcloud -- apt update lxc exec nextcloud -- apt dist-upgrade -y lxc exec nextcloud -- apt install squashfuse -y

And then, lets install that “nextcloud” snap with:

lxc exec nextcloud -- snap install nextcloud

Finally, grab the container’s IP and access “http://<IP>” with your web browser:

stgraber@castiana:~$ lxc list nextcloud +-----------+---------+----------------------+----------------------------------------------+ | NAME | STATE | IPV4 | IPV6 | +-----------+---------+----------------------+----------------------------------------------+ | nextcloud | RUNNING | 10.148.195.47 (eth0) | fd42:ee2:5d34:25c6:216:3eff:fe86:4a49 (eth0) | +-----------+---------+----------------------+----------------------------------------------+

Installing the LXD snap in a LXD container

First, lets get ourselves an Ubuntu 16.10 container with “squashfuse” installed inside it.
This time with support for nested containers.

lxc launch ubuntu:16.10 lxd -c security.nesting=true lxc exec lxd -- apt update lxc exec lxd -- apt dist-upgrade -y lxc exec lxd -- apt install squashfuse -y

Now lets clear the LXD that came pre-installed with the container so we can replace it by the snap.

lxc exec lxd -- apt remove --purge lxd lxd-client -y

Because we already have a stable LXD on the host, we’ll make things a bit more interesting by installing the latest build from git master rather than the latest stable release:

lxc exec lxd -- snap install lxd --edge

The rest is business as usual for a LXD user:

stgraber@castiana:~$ lxc exec lxd bash root@lxd:~# lxd init Name of the storage backend to use (dir or zfs) [default=dir]: We detected that you are running inside an unprivileged container. This means that unless you manually configured your host otherwise, you will not have enough uid and gid to allocate to your containers. LXD can re-use your container's own allocation to avoid the problem. Doing so makes your nested containers slightly less safe as they could in theory attack their parent container and gain more privileges than they otherwise would. Would you like to have your containers share their parent's allocation (yes/no) [default=yes]? Would you like LXD to be available over the network (yes/no) [default=no]? Would you like stale cached images to be updated automatically (yes/no) [default=yes]? Would you like to create a new network bridge (yes/no) [default=yes]? What should the new bridge be called [default=lxdbr0]? What IPv4 subnet should be used (CIDR notation, “auto” or “none”) [default=auto]? What IPv6 subnet should be used (CIDR notation, “auto” or “none”) [default=auto]? LXD has been successfully configured. root@lxd:~# lxd.lxc launch images:archlinux arch If this is your first time using LXD, you should also run: sudo lxd init To start your first container, try: lxc launch ubuntu:16.04 Creating arch Starting arch root@lxd:~# lxd.lxc list +------+---------+----------------------+-----------------------------------------------+------------+-----------+ | NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS | +------+---------+----------------------+-----------------------------------------------+------------+-----------+ | arch | RUNNING | 10.106.137.64 (eth0) | fd42:2fcd:964b:eba8:216:3eff:fe8f:49ab (eth0) | PERSISTENT | 0 | +------+---------+----------------------+-----------------------------------------------+------------+-----------+

And that’s it, you now have the latest LXD build installed inside a LXD container and running an archlinux container for you. That LXD build will update very frequently as we publish new builds to the edge channel several times a day.

Conclusion

It’s great to have snaps now install properly inside LXD containers. Production users can now setup hundreds of different containers, network them the way they want, setup their storage and resource limits through LXD and then install snap packages inside them to get the latest upstream releases of the software they want to run.

That’s not to say that everything is perfect yet. This is all built on some really recent kernel work, using unprivileged FUSE filesystem mounts and unprivileged AppArmor profile stacking and namespacing. There very likely still are some issues that need to get resolved in order to get most snaps to work identically to when they’re installed directly on the host.

If you notice discrepancies between a snap running directly on the host and a snap running inside a LXD container, you’ll want to look at the “dmesg” output, looking for any DENIED entry in there which would indicate AppArmor rejecting some request from the snap.

This typically indicates either a bug in AppArmor itself or in the way the AppArmor profiles are generated by snapd. If you find one of those issues, you can report it in #snappy on irc.freenode.net or file a bug at https://launchpad.net/snappy/+filebug so it can be investigated.

Extra information

More information on snap packages can be found at: http://snapcraft.io

The main LXD website is at: https://linuxcontainers.org/lxd
Development happens on Github at: https://github.com/lxc/lxd
Mailing-list support happens on: https://lists.linuxcontainers.org
IRC support happens in: #lxcontainers on irc.freenode.net
Try LXD online: https://linuxcontainers.org/lxd/try-it

The Fridge: Ubuntu Weekly Newsletter Issue 490

Planet Ubuntu - Mon, 12/05/2016 - 21:17

Welcome to the Ubuntu Weekly Newsletter. This is issue #490 for the week November 28 – December 4, 2016, and the full version is available here.

In this issue we cover:

The issue of The Ubuntu Weekly Newsletter is brought to you by:

  • Paul White
  • Chris Guiver
  • Elizabeth K. Joseph
  • And many others

If you have a story idea for the Weekly Newsletter, join the Ubuntu News Team mailing list and submit it. Ideas can also be added to the wiki!

Except where otherwise noted, content in this issue is licensed under a Creative Commons Attribution 3.0 License BY SA Creative Commons License

Ubuntu Weekly Newsletter Issue 490

The Fridge - Mon, 12/05/2016 - 21:17

Welcome to the Ubuntu Weekly Newsletter. This is issue #490 for the week November 28 – December 4, 2016, and the full version is available here.

In this issue we cover:

The issue of The Ubuntu Weekly Newsletter is brought to you by:

  • Paul White
  • Chris Guiver
  • Elizabeth K. Joseph
  • And many others

If you have a story idea for the Weekly Newsletter, join the Ubuntu News Team mailing list and submit it. Ideas can also be added to the wiki!

Except where otherwise noted, content in this issue is licensed under a Creative Commons Attribution 3.0 License BY SA Creative Commons License

Seif Lotfy: Playing with .NET (dotnet) and IronFunctions

Planet Ubuntu - Mon, 12/05/2016 - 15:15

Again if you missed it, IronFunctions is open-source, lambda compatible, on-premise, language agnostic, server-less compute service.

While AWS Lambda only supports Java, Python and Node.js, Iron Functions allows you to use any language you desire by running your code in containers.

With Microsoft being one of the biggest players in open source and .NET going cross-platform it was only right to add support for it in the IronFunctions's fn tool.

TL;DR:

The following demos a .NET function that takes in a URL for an image and generates a MD5 checksum hash for it:

Using dotnet with functions

Make sure you downloaded and installed dotnet. Now create an empty dotnet project in the directory of your function:

dotnet new

By default dotnet creates a Program.cs file with a main method. To make it work with IronFunction's fn tool please rename it to func.cs.

mv Program.cs func.cs

Now change the code as you desire to do whatever magic you need it to do. In our case the code takes in a URL for an image and generates a MD5 checksum hash for it. The code is the following:

using System; using System.Text; using System.Security.Cryptography; using System.IO; namespace ConsoleApplication { public class Program { public static void Main(string[] args) { // if nothing is being piped in, then exit if (!IsPipedInput()) return; var input = Console.In.ReadToEnd(); var stream = DownloadRemoteImageFile(input); var hash = CreateChecksum(stream); Console.WriteLine(hash); } private static bool IsPipedInput() { try { bool isKey = Console.KeyAvailable; return false; } catch { return true; } } private static byte[] DownloadRemoteImageFile(string uri) { var request = System.Net.WebRequest.CreateHttp(uri); var response = request.GetResponseAsync().Result; var stream = response.GetResponseStream(); using (MemoryStream ms = new MemoryStream()) { stream.CopyTo(ms); return ms.ToArray(); } } private static string CreateChecksum(byte[] stream) { using (var md5 = MD5.Create()) { var hash = md5.ComputeHash(stream); var sBuilder = new StringBuilder(); // Loop through each byte of the hashed data // and format each one as a hexadecimal string. for (int i = 0; i < hash.Length; i++) { sBuilder.Append(hash[i].ToString("x2")); } // Return the hexadecimal string. return sBuilder.ToString(); } } } }

Note: IO with an IronFunction is done via stdin and stdout. This code

Using with IronFunctions

Let's first init our code to become IronFunctions deployable:

fn init <username>/<funcname>

Since IronFunctions relies on Docker to work (we will add rkt support soon) the <username> is required to publish to docker hub. The <funcname> is the identifier of the function.

In our case we will use dotnethash as the <funcname>, so the command will look like:

fn init seiflotfy/dotnethash

When running the command it will create the func.yaml file required by functions, which can be built by running:

Push to docker fn push

This will create a docker image and push the image to docker.

Publishing to IronFunctions

To publish to IronFunctions run ...

fn routes create <app_name>

where <app_name> is (no surprise here) the name of the app, which can encompass many functions.

This creates a full path in the form of http://<host>:<port>/r/<app_name>/<function>

In my case, I will call the app myapp:

fn routes create myapp Calling

Now you can

fn call <app_name> <funcname>

or

curl http://<host>:<port>/r/<app_name>/<function>

So in my case

echo http://lorempixel.com/1920/1920/ | fn call myapp /dotnethash

or

curl -X POST -d 'http://lorempixel.com/1920/1920/' http://localhost:8080/r/myapp/dotnethash What now?

You can find the whole code in the examples on GitHub. Feel free to join the Iron.io Team on Slack.
Feel free to write your own examples in any of your favourite programming languages such as Lua or Elixir and create a PR :)

Harald Sitter: KDE Framworks 5 Content Snap Techno

Planet Ubuntu - Mon, 12/05/2016 - 09:10

In the previous post on Snapping KDE Applications we looked at the high-level implication and use of the KDE Frameworks 5 content snap to snapcraft snap bundles for binary distribution. Today I want to get a bit more technical and look at the actual building and inner workings of the content snap itself.

The KDE Frameworks 5 snap is a content snap. Content snaps are really just ordinary snaps that define a content interface. Namely, they expose part or all of their file tree for use by another snap but otherwise can be regular snaps and have their own applications etc.

KDE Frameworks 5’s snap is special in terms of size and scope. The whole set of KDE Frameworks 5, combined with Qt 5, combined with a large chunk of the graphic stack that is not part of the ubuntu-core snap. All in all just for the Qt5 and KF5 parts we are talking about close to 100 distinct source tarballs that need building to compose the full frameworks stack. KDE is in the fortunate position of already having builds of all these available through KDE neon. This allows us to simply repack existing work into the content snap. This is for the most part just as good as doing everything from scratch, but has the advantage of saving both maintenance effort and build resources.

I do love automation, so the content snap is built by some rather stringy proof of concept code that automatically translates the needed sources into a working snapcraft.yaml that repacks the relevant KDE neon debs into the content snap.

Looking at this snapcraft.yaml we’ll find some fancy stuff.

After the regular snap attributes the actual content-interface is defined. It’s fairly straight forward and simply exposes the entire snap tree as kde-frameworks-5-all content. This is then used on the application snap side to find a suitable content snap so it can access the exposed content (i.e. in our case the entire file tree).

slots: kde-frameworks-5-slot: content: kde-frameworks-5-all interface: content read: - "."

The parts of the snap itself are where the most interesting things happen. To make things easier to read and follow I’ll only show the relevant excerpts.

The content snap consists of the following parts: kf5, kf5-dev, breeze, plasma-integration.

The kf5 part is the meat of the snap. It tells snapcraft to stage the binary runtime packages of KDE Frameworks 5 and Qt 5. This effectively makes snapcraft pack the named debs along with necessary dependencies into our snap.

kf5: plugin: nil stage-packages: - libkf5coreaddons5 ...

The kf5-dev part looks almost like the kf5 part but has entirely different functionality. Instead of staging the runtime packages it stages the buildtime packages (i.e. the -dev packages). It additionally has a tricky snap rule which excludes everything from actually ending up in the snap. This is a very cool tricky, this effectively means that the buildtime packages will be in the stage and we can build other parts against them, but we won’t have any of them end up in the final snap. After all, they would be entirely useless there.

kf5-dev: after: - kf5 plugin: nil stage-packages: - libkf5coreaddons-dev .... snap: - "-*"

Besides those two we also build two runtime integration parts entirely from scratch breeze and plasma-integration. They aren’t actually needed, but ensure sane functionality in terms of icon theme selection etc. These are ordinary build parts that simply rely on the kf5 and kf5-dev parts to provide the necessary dependencies.

An important question to ask here is how one is meant to build against this now. There is this kf5-dev part, but it does not end up in the final snap where it would be entirely useless anyway as snaps are not used at buildtime. The answer lies in one of the rigging scripts around this. In the snapcraft.yaml we configured the kf5-dev part to stage packages but then excluded everything from being snapped. However, knowing how snapcraft actually goes about its business we can “abuse” its inner workings to make use of the part after all. Before the actual snap is created snapcraft “primes” the snap, this effectively means that all installed trees (i.e. the stages) are combined into one tree (i.e. the primed tree), the exclusion rule of the kf5-dev part is then applied on this tree. Or in other words: the primed tree is the snap before exclusion was applied. Meaning the primed tree is everything from all parts, including the development headers and CMake configs. We pack this tree in a development tarball which we then use on the application side to stage a development environment for the KDE Frameworks 5 snap.

Specifically on the application-side we use a boilerplate part that employs the same trick of stage-everything but snap-nothing to provide the build dependencies while not having anything end up in the final snap.

kde-frameworks-5-dev: plugin: dump snap: [-*] source: http://build.neon.kde.org/job/kde-frameworks-5-release_amd64.snap/lastSuccessfulBuild/artifact/kde-frameworks-5-dev_amd64.tar.xz

Using the KDE Framworks 5 content snap KDE can create application snaps that are a fraction of the size they would be if they contained all dependencies themselves. While this does give up optimization potential by aggregating requirements in a more central fashion it quickly starts paying off given we are saving upwards of 70 MiB per snap.

Application snaps can of course still add more stuff on top or even override things if needed.

Finally, as we approach the end of the year, we begin the season of giving. What would suit the holidays better than giving to the entire world by supporting KDE with a small donation?

Rafael Carreras: Yakkety Yak release parties

Planet Ubuntu - Mon, 12/05/2016 - 06:44

Catalan LoCo Team celebrated on November 5th a release party of the next Ubuntu version, in that case, 16.10 Xenial Xerus, in Ripoll, such a historical place. As always, we started explaining what Ubuntu is and how it adapts to new times and devices.

FreeCad 3D design and Games were both present at the party.

A few weeks later, in December 3rd, we did another release party, this time in Barcelona.

We went to Soko, previously a chocolate factory, that nowadays is a kind of Makers Lab, very excited about free software. First, Josep explained the current developments in Ubuntu and we carried some installations on laptops.

We ate some pizza and had discussions about free software on public administrations. Apart from the usual users who came to install Ubuntu on their computers, the responsible from Soko gave us 10 laptops for Ubuntu installation too. We ended the tasks installing Wine for some Lego to run.

That’s some art that is being made at Soko.

I’m releasing that post because we need some documentation on release parties. If you need some advice on how to manage a release party, you can contact me or anyone in Ubuntu community.

 

Svetlana Belkin: Community Service Learning Within Open * Communities

Planet Ubuntu - Sun, 12/04/2016 - 14:35

As the name implies, “service-learning is an educational approach that combines learning objectives with community service in order to provide a pragmatic, progressive learning experience while meeting societal needs” (Wikipedia).  When you add the “community” part to that definition it changes to, “about leadership development as well as traditional information and skill acquisition” (Janet 1999).

How does this apply to Open * communities?

Simple!  Community service learning is an ideal way to get middle/high school/college students to get involved within the various communities and understand the power of Open *. And also to stay active after their term of community service learning.

This idea came to me just today (as of writing, Nov. 30th) as a thought on what is really Open *.  Not the straightforward definition of it but the the affect Open * creates.  As I stated on my home page of my site, Open * creates a sense of empowerment.  One way is through the actions that create skills and improvements to those skills.  Which skills are those?  Mozilla Learning made a map and description to these skills on their Web Literacy pages.  They are show below also:

Most of these skills along with the ways to gain these skills (read, write, participate) can be used as skills to worked on for community service learning.

As stated above, community service learning is really the focus of gaining skills and leadership skills while (in the Open * sense) contribute to projects that impacts the society of the world.  This is really needed now as there are many local and world issues that Open * can provide solutions too.

I see this as an outreach program for schools and the various organizations/groups such as Ubuntu, System76, Mozilla, and even Linux Padawan.  Unlike Google Summer of Code (GSoC), no one receives a stipend but the idea of having a mentor could be taken from GSoC.  No, not could but should.  Because the student needs someone to guide them, hence Linux Padawan could benefit from this idea.

Having that said, I will try to work out a sample program that could be used and maybe test it with Linux Padawan.  Maybe I could have this ready by spring semester.

Random Fact #1: Simon Quigley, through his middle school, is in a way already doing this type of learning.

Random Fact #2: At one point of time, I wanted to translate that Web Literacy map into one that can be applied to Open *, not just one topic.

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