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Kubuntu: Welcome new Kubuntu Members

Planet Ubuntu - Sun, 11/20/2016 - 15:57

Friday November 18 was a productive day for the Kubuntu Community, as three new people were questioned and then elected into Membership. Welcome Simon Quigley, José Manuel Santamaría, and Walter Lapchynski as they package, work on our tooling, promote Kubuntu and help users.

Read more about Kubuntu Membership here: https://community.kde.org/Kubuntu/Membership

Svetlana Belkin: Ubuntu Community Appreciation Day 2016

Planet Ubuntu - Sun, 11/20/2016 - 11:06

It’s that time of the year where we appreciate the members of our Ubuntu Community, Member or not.

This year I appreciate a group of people and three others.  The group is the one that gone to Ohio Linux Fest this year.  I thank you for all of the fun!

The first person that I appreciate is for his Tweet about me (which explains everything why I choose him), which is  Benjamin Kerensa:

I’m always inspired by @senseopenness she leads and keeps people inspired

— Benjamin Kerensa (@bkerensa) June 9, 2016

The second person is Simon Quigley who is quite an awesome kid.  Over the last year, he has really changed his attitude and even his behavior where it doesn’t not sound like he is a 14 year-old but older.  Because he is a youngster,  he has a good chance that he will get a job within Open Source, development-wise or anything else.

Last but not least, the last person is Pavel Sayekat. Like Simon, he also has improved and now is helping to get his LoCo, Ubuntu Bangladesh, active again.

Keep it up everyone for making the Community the way it is!

Daniel Holbach: Ubuntu Community Appreciation Day

Planet Ubuntu - Sun, 11/20/2016 - 00:26

It’s 20th November 2016, so today marks another Ubuntu Community Appreciation Day. The idea for the event was put together by Ahmed Shams in 2011 and it’s simple but brilliant: once a year (at least), take the time to thank some specific people for their work in Ubuntu.

As I’m at UbuCon Europe this weekend, it’s incredibly easy to pick somebody whose work I’m grateful for. Today I’d like to thank all the event organisers in the Ubuntu world. Without people like Sujeevan Vijayakumaran (in the case of UbuCon Europe), we as a community, wouldn’t be able to get together, learn from each other and have fun together. It takes a set of special skills to organise big and small events, plan ahead, talk to various people and companies, organise sponsors and helpers and it’s something we often take too much for granted.

Thank you everyone who organised the Ubuntu events I’ve been to over the years, no matter if it’s the small meetings in a bar or the crazy big events, like UDSes (thanks Claire, Marianna and Michelle!). You are incredible rockstars and I had some of my best times thanks to you!

Stuart Langridge: None Of Us Are Free

Planet Ubuntu - Fri, 11/18/2016 - 20:28

Well you better listen my sisters and brothers,
‘Cause if you do you can hear
There are voices still calling across the years.
And they’re all crying across the ocean,
And they’re cryin’ across the land,
And they will till we all come to understand.

None of us are free
None of us are free
None of us are free, if one of us is chained
None of us are free

And there are people still in darkness,
And they just can’t see the light.
If you don’t say it’s wrong then that says it right.
We got try to feel for each other, let our brothers know that we care.
Got to get the message, send it out loud and clear

None of us are free
None of us are free
None of us are free, if one of us is chained
None of us are free

Now I swear your salvation isn’t too hard too find,
None of us can find it on our own
We’ve got to join together in spirit, heart and mind
So that every soul who’s suffering will know that they’re not alone

None of us are free
None of us are free
None of us are free, if one of us is chained
None of us are free

If you just look around you,
You’re gonna see what I say.
‘Cause the world is getting smaller each passing day
Now it’s time to start making changes,
And it’s time for us all to realize,
That the truth is shining real bright right before our eyes

None of us are free
None of us are free
None of us are free, if one of us is chained
None of us are free.

Application of this to the year 2016, how you should deal with everything that’s happened this year, and how you should stand with your friends and the people around you… is left as an exercise for the reader.

Aaron Honeycutt: SeaGL 2016

Planet Ubuntu - Fri, 11/18/2016 - 01:00

I’d like to first thank the amazing Ubuntu community for funding this trip to promote all *buntu’s, provide a face to face for Ubuntu, Kubuntu, and Lubuntu contributors to plan the next cycle and more to come!

After the booth was up and running with people from Ubuntu, Kubuntu, Lubuntu. We had machines running Kubuntu, Lubuntu and a few devices with Ubuntu Touch. We were also showing off both gaming on *buntu and how well the Steam Controller works with it.

Currently Kubuntu does not have a Release Manager and as such we have started talking to Lubuntu’s Walter (wxl) as he has been working as Lubuntu’s RM for a few releases. We quickly realized that we don’t have any documentation on how that is handled. Thanks to Walter we now have a great starting point on how releases are normally worked out, we’ll have to see if Kubuntu needs any extra steps but it’s a step in the right direction.

 

Adam Stokes: conjure-up Canonical Kubernetes under LXD today!

Planet Ubuntu - Thu, 11/17/2016 - 16:46

We've just added the Localhost (LXD) cloud type to the list of supported cloud type on which you can deploy The Canonical Distribution of Kubernetes.

What does this mean? Just like with our OpenStack offering you can now have Kubernetes deployed and running all on a single machine. All moving parts are confined inside their own LXD containers and managed by Juju.

It can be surprisingly time-consuming to get Kubernetes from zero to fully deployed. However, with conjure-up and the driving technology underneath, you can get straight Kubernetes on a single system with LXD, or a public cloud such as AWS, GCE, or Azure all in about 20 minutes.

Getting Started

First, we need to configure LXD to be able to host a large number of containers. To do this we need to update the kernel parameters for inotify.

On your system open up /etc/sysctl.conf *(as root) and add the following lines:

fs.inotify.max_user_instances = 1048576 fs.inotify.max_queued_events = 1048576 fs.inotify.max_user_watches = 1048576 vm.max_map_count = 262144

Note: This step may become unnecessary in the future

Next, apply those kernel parameters (you should see the above options echoed back out to you):

$ sudo sysctl -p

Now you’re ready to install conjure-up and deploy Kubernetes.

$ sudo apt-add-repository ppa:juju/stable $ sudo apt-add-repository ppa:conjure-up/next $ sudo apt update $ sudo apt install conjure-up $ conjure-up kubernetes Walkthrough

We all like pictures so the next bit will be a screenshot tour of deploying Kubernetes with conjure-up.

For this walkthrough we are going to create a new controller, select the localhost Cloud type:

Deploy the applications:

Wait for Juju bootstrap to finish:

Wait for our Applications to be fully deployed:

Run the final post processing steps to automatically configure your Kubernetes environment:

Review the final summary screen:

Accessing your Kubernetes

You can access your Kubernetes by running the following:

$ ~/kubectl --kubeconfig=~/.kube/config

Or if you've already run this once it'll create a new config file as shown in the summary screen.

$ ~/kubectl --kubeconfig=~/.kube/config.conjure-up

Or take a look at the Kibana dashboard, visit http://ip.of.your.deployed.kibana.dashboard:

Deploy a Workload

As an example for users unfamiliar with Kubernetes, we packaged an action to both deploy an example and clean itself up.

To deploy 5 replicas of the microbot web application inside the Kubernetes cluster run the following command:

$ juju run-action kubernetes-worker/0 microbot replicas=5

This action performs the following steps:

It creates a deployment titled 'microbots' comprised of 5 replicas defined during the run of the action. It also creates a service named 'microbots' which binds an 'endpoint', using all 5 of the 'microbots' pods.

Finally, it will create an ingress resource, which points at a xip.io domain to simulate a proper DNS service.

To see the result of this action run:

Action queued with id: e55d913c-453d-4b21-8967-44e5d54716a0 $ juju show-action-output e55d913c-453d-4b21-8967-44e5d54716a0 results: address: microbot.10.205.94.34.xip.io status: completed timing: completed: 2016-11-17 20:52:38 +0000 UTC enqueued: 2016-11-17 20:52:35 +0000 UTC started: 2016-11-17 20:52:37 +0000 UTC

Take a look at your newly deployed workload on Kubernetes!

Mother will be so proud.

This covers just a small portion of The Canonical Distribution of Kubernetes, please visit the charmstore for more in-depth documentation.

Ubuntu Podcast from the UK LoCo: S09E38 – Jon’s Second Breakfast - Ubuntu Podcast

Planet Ubuntu - Thu, 11/17/2016 - 08:00

It’s Episode Thirty-Eight of Season-Nine of the Ubuntu Podcast! Alan Pope, Mark Johnson, Martin Wimpress and Jon Spriggs are connected and speaking to your brain.

The same line up as last week are here for another episode.

In this week’s show:

Thing Explainer Competition

The competition was to describe your job, using only the 1000 most common English words using the upgoer5 text editor to help.

To all the software engineers, oncologists, system administrators, electrical engineers, doctors, technical support staff, project managers, games developers, petro-chemical engineers, information security analysts, surgeons, user experience researchers, network engineers, prison wardens, sales personnel, digital forensic analysts, medical technicians, speech therapists, digital artists, DJs, teachers, machinists, translators of ancient texts and would-be astronauts who entered this competition…

Thank you for taking the time to enter and making us laugh!

The winner is Magnus Lindström!

Our congratulations Magnus, who won signed copies of “What If?” and “Thing Explainer” by Randall Munroe (creator of XKCD) with this entry:

The police and others send people who have done bad things to me. I give them a room in my ‘house’ and they are not allowed to leave until I say so. I tell these people not to do bad things again and I also help them with how not to do bad things. I write papers when they do bad things while they are living in my ‘house’ and give them warning. I have some rooms that have little in them where they get to stay if they have been doing really bad things to others or to themselves. Some like to live there because they get food, clean clothes, something to do and help. Some hate it and try to leave even though they are not allowed. If these people have done many bad things in my ‘house’ or tried to leave without checking with me, I can tell them that they have to stay for a longer time.

The runners up

Listen to this episode to hear us read out the runner up entries from:

  • Dave Hingley
  • Ivan Pejić
  • Tai Kedzierski
  • John Garner
  • Jordan [redacted]
  • Surma Saif
  • Katherine Hill
  • Iain Forbes
John Garner’s Thing Explainer Picture

This picture accompanies John Garner’s competition entry. Listen to this episode to hear how he explains what he does.

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.

Daniel Holbach: Ubuntu Online Summit from a snap perspective

Planet Ubuntu - Thu, 11/17/2016 - 01:36

Earlier this week the Ubuntu community was busy with the Ubuntu Online Summit. If you head to the schedule page, you can watch all the sessions which happened.

As I’m interested in snaps a lot, I’d like to highlight some of the sessions which happened there, so if you missed them, you can go back and see what happened there:

  • Intro and keynote by Gustavo Niemeyer
    Gustavo (amongst others projects he is involved with) is one of the lead developers of snapd. During his keynote he gives an overview over what the team has been working on in the last time and explains which features all landed in the snap world recently. It quickly gives you an idea of the pace of development and the breadth of new features which landed.
  • Creating your first snap
    This is a session I gave. Unfortunately Didier couldn’t make it as he had lost his voice in the days before. We both worked together on the content for this. Basically, if you’re new to using and creating snaps, watch this. It’s a series of very simple steps you can follow along and gives you enough background to see the bigger picture.
  • Snap roadmap and Q&A
    This was a fun session with Michael Vogt and Zygmunt Krynicki. They are also both lead developers of snapd and they share a lot of their thoughts in their own very fun and very interesting way. After some discussion of the roadmap, they dived right into the almost endless stream of questions. If you want to get an idea of what’s coming up and some of the more general decisions behind snaps, watch this one.
  • Building snaps in Launchpad
    Colin Watson gave this demo of a beautiful new feature in Launchpad. Starting from a github repo (the source could live elsewhere too), the source is pulled into Launchpad, snaps are built for selected releases of Ubuntu and selected architectures and directly pushed to the store. It’s incredibly easy to set up, complements your CI process and makes building on various architectures and publishing the snaps trivial. Thanks a lot for everybody’s work on this!

The other sessions were great too, this is just what I picked up from the world of snaps.

Enjoy watching the videos and share them please!

Thanks a lot to all the session leads as well!

Ubuntu App Developer Blog: Ubuntu SDK meets snapcraft

Planet Ubuntu - Wed, 11/16/2016 - 08:41

Everyone who has followed Ubuntu lately for sure stumbled across the snappy technology, which does not only bring the new cross-distro packaging format “snap” but also a sandboxing technology for apps, as well as transactional updates that can be rolled back in case of an update going wrong and a new way of installing and upgrading Ubuntu called “Ubuntu Core”.

Together with all those new technologies came new tools that make it possible for app developers to build and pack their applications to target Snappy and Core. The central tool for that is snapcraft and it aims to unite a lot of tasks that were separate before. It can set up your build environment, build your projects and even package it with just one call in the project directory: “snapcraft”.

We took the last few weeks to start the work on supporting those new tools and now we have the first release of the IDE with direct support for building with snapcraft, as well as a basic template to get you started.

New technologies usually come with certain limitations. This one is not an exception and we hope that these issues will be eliminated in the near future.:

  • Snapcraft uses sudo when it needs to install build packages, however that does not work when run from the QtCreator, simply because sudo does not have a console to ask the password on. So make sure build dependencies are installed before building.

  • “Out of source” builds are not yet implemented in snapcraft, but since QtCreator always uses a extra build directory we had to work around that problem. So for now we rsync the full project into a build directory and run the build there.

  • Also incremental builds are yet not supported, so every build is a complete rebuild.

Snapcraft projects are described in a snapcraft.yaml file, so it made sense for us to use it as the project file in the IDE as well, so instead of opening a .pro or CMakeList.txt file the snapcraft.yaml is opened directly. Naturally implementing a completely new project type manager is not a trivial task, so many key features are still missing.

  • Code model support: while completion does work in the file scope, it does not for the full project.

  • Debugging mode: currently the profiling and debugging run modes do not work, so snap projects can only be executed normally.

Those limitations aside it can be already used to create snap packaged applications.

With this new release we consider the IDE as feature complete for the time being. Since the development of snapcraft is moving in a very fast pace we need to let it evolve to a certain degree to be sure new features added to the IDE represent the future way of building with snapcraft.

Jorge Castro: Kubernetes the Easy Way

Planet Ubuntu - Wed, 11/16/2016 - 08:00

If you’re interested in running Kubernetes you’ve probably heard of Kelsey Hightower’s Kubernetes the Hard Way. Exercises like these are important, they highlight the coordination needed between components in modern stacks, and it highlights how far the world has come when it comes to software automation. Could you imagine if you had to set everything up the hard way every time?

Learning is fun

Doing things the hard way is fun, once. After that, I’ve got work to do, and soon after I am looking around to see who else has worked on this problem and how I can best leverage the best open source has to offer.

It reminds me of the 1990’s when I was learning Linux. Sure, as a professional, you need to know systems and how they work, down to the kernel level if need. Having to do those things without a working keyboard or network makes that process much harder. Give me a working computer, and then I can begin. There’s value in learning how the components work together and understanding the architecture of Kubernetes, I encourage everyone to try the hard way at least one time, if anything it’ll make you appreciate the work people are putting into automating all of this for you in a composable and reusable way.

The easy way

I am starting a new series of videos on how we’re making the Canonical Distribution of Kubernetes easy for anyone to deploy on any cloud. All our code is open source and we love pull requests. Our goal is to help people get Kubernetes in as many places as quickly and easily as possible. We’ve incorporated lots of the things people tell us they’re looking for in a production-grade Kubernetes, and we’re always looking to codify those best practices.

Enjoy:

Following these steps will get you a working cluster, in this example I’m deploying to us-east-2, the shiny new AWS region. Subsequent videos will cover how to interact with the cluster and do more things with it.

Ubuntu App Developer Blog: How to create Snap packages of Qt applications

Planet Ubuntu - Wed, 11/16/2016 - 04:19
Introduction

One of the advantages of snap packages is that they are self-contained. When you install a snap, you know that you don’t need to install additional dependencies (besides the automatically-installed core snap that provides the basic operating system layer), and it will simply work on every Linux distribution that supports snaps.

Here, we show how to create self-contained snap packages for Qt-based applications, and we show an additional approach where some of the app dependencies are provided by a separate snap: the Ubuntu app platform snap. The platform snap provides an (optional) approach for the software provider, and can save disk space in some cases. Below we will explain the two approaches to building a snap for Qt-based software: a snap that is self-contained and includes Qt, and one that uses the platform snap, and we show the advantages of each approach. However, before showing these two approaches that you can apply to your own QML code, we demonstrate how to create a snap from deb packages in the Ubuntu archive so that you can get started right away even before you write any code.

We assume that before reading this blog post, you have acquired knowledge about how to use Snapcraft. So if you haven’t, we recommend reading the documentation on snapcraft.io and the snap-codelabs tutorials.

All the commands that are listed below are executed on an Ubuntu 16.04 LTS machine with the stable-phone-overlay PPA enabled. Some of the snapcraft commands may run on other configurations, but for the “Ubuntu App Platform Snap” section it is a hard requirement because the version of Qt - upstream 5.6 long term support version - and other libraries used to build the snap need to match the versions in the ubuntu-app-platform snap. Installing the snap packages works on different versions of Ubuntu and even different Linux distributions. The examples were tested on amd64 architecture with Intel graphics. If you are running this on a different CPU architecture, naturally the architecture in the directory and snap file names listed below must be modified. If you have an Nvidia GPU and use the Nvidia proprietary drivers there can be problems when running some snapped applications, so in that case we currently recommend to use the open source Nouveau drivers.

The examples are also available in a repository linked to from the Evaluation section.

Qt cloud parts - a simple use case

We will demonstrate how to build a simple app snap that includes the Qt release and Ubuntu UI Toolkit (UITK) from the Ubuntu archives. For this example, we use the UITK gallery which is part of the ubuntu-ui-toolkit-examples deb package on classic Ubuntu systems, so no additional code is needed. Because of that, we can simply use the nil plugin and pull in the examples as stage-packages. We create a directory called uitk-gallery which contains only a snapcraft.yaml file with the following contents:

name: uitk-gallery version: '0.1' summary: Showcase gallery that demonstrates the components in the Ubuntu UI Toolkit. description: | See https://developer.ubuntu.com/api/qml/ for the API documentation of the components. grade: devel confinement: strict parts: ubuntu-ui-toolkit-examples: plugin: nil stage-packages: - qmlscene - qml-module-qtqml-models2 - ubuntu-ui-toolkit-examples after: [desktop-qt5] apps: uitk-gallery: command: desktop-launch "qmlscene $SNAP/usr/lib/*/qt5/examples/ubuntu-ui-toolkit/examples/ubuntu-ui-toolkit-gallery/ubuntu-ui-toolkit-gallery.qml" plugs: [unity7, opengl]

(notes: the command line assumes you are on and targeting amd64 system. the plugs line is needed so that you have access to graphical subsystem from your confined app)

Under stage-packages we listed all the packages that need to be pulled from the Ubuntu archive, including their dependencies. ubuntu-ui-toolkit-examples contains all the QML code for the UITK gallery that we want to run using qmlscene. We also included qml-module-qtqml-models2 because some pages of the UITK gallery import QtQml.Models. The line after: [desktop-qt5] fetches the desktop-qt5 part from the remote parts repository. It will automatically pull in Qt 5 from the Ubuntu archive, set-up environment variables, and provide the desktop-launch script that is called to start the app. The snap file can be created simply by going to the uitk-gallery directory which contains the snapcraft.yaml file, and running:

snapcraft

Note that Snapcraft will ask for the sudo password to install the Qt5 dev packages that are required to compile Qt apps, but can be left out if all the dependencies are already present. Running snapcraft will create (on an amd64 machine) the file uitk-gallery_0.1_amd64.snap which can then be installed by:

snap install --dangerous uitk-gallery_0.1_amd64.snap

where the dangerous parameter is required because we are installing an unsigned snap that does not come from the Ubuntu store. Note that you do not need to use sudo if you have logged in with snap login. The UITK gallery can now be launched using:

uitk-gallery

The desktop-qt5 cloud part pulls in the current stable version of Qt of the Ubuntu 16.04 LTS release - 5.5.1 normally or 5.6.1 in the case of stable overlay PPA. To uninstall the UITK gallery snap before going to the next section, run:

snap remove uitk-gallery QML project using parts from the cloud

If your existing QML code is not available as a deb package, then obviously you cannot pull it in from the archive when creating the snap using stage-packages. To show how to include your own QML code, we copy the UITK gallery code to the ubuntu-ui-toolkit-gallery directory inside the snapcraft (uitk-gallery) directory. Go to the parent directory of the uitk-gallery of the previous section, and run:

bzr branch lp:ubuntu-ui-toolkit cp -R ubuntu-ui-toolkit/examples/ubuntu-ui-toolkit-gallery uitk-gallery/

Alternatively, if you have the ubuntu-ui-toolkit-examples package installed, you can run:

cp -R /usr/lib/*/qt5/examples/ubuntu-ui-toolkit/examples/ubuntu-ui-toolkit-gallery/ uitk-gallery/

You should now have both the snapcraft.yaml and the copied ubuntu-ui-toolkit-gallery directory that contains the source code of the UITK gallery under the uitk-gallery. We can now remove the ubuntu-ui-toolkit-examples from the stage-packages in the snapcraft.yaml file. Because that line is removed, the dependencies of the UITK gallery are no longer pulled in automatically, and we must add them to the YAML file, which then becomes:

name: uitk-gallery version: '0.2' summary: Showcase gallery that demonstrates the components in the Ubuntu UI Toolkit. description: | See https://developer.ubuntu.com/api/qml/ for the API documentation of the components. grade: devel confinement: strict parts: ubuntu-ui-toolkit-gallery: plugin: dump source: . stage-packages: - qmlscene - qml-module-qtqml-models2 - qml-module-qt-labs-folderlistmodel - qml-module-qtquick-xmllistmodel - qml-module-ubuntu-components - ubuntu-ui-toolkit-theme - ubuntu-ui-toolkit-tools after: [desktop-qt5] apps: uitk-gallery: command: desktop-launch "qmlscene $SNAP/ubuntu-ui-toolkit-gallery/ubuntu-ui-toolkit-gallery.qml" plugs: [unity7, opengl]

Note that besides the changes in stage-packages, also the location of ubuntu-ui-toolkit-gallery.qml was updated in the uitk-gallery command because the QML files are no longer installed in usr/lib inside the snap, but copied in the root of the snap filesystem. As before, the snap package can be created by executing:

snapcraft

inside the uitk-gallery directory. The UITK gallery can then be installed and started using:

snap install --dangerous uitk-gallery_0.2_amd64.snap uitk-gallery

and uninstalled by:

snap remove uitk-gallery

Now that you have seen how to package the UITK gallery from source into a snap, you can do the same for your own QML application by using the dump plugin with the dependencies as stage-packages. If your application includes C++ code as well, you need to use another plugin, for example the qmake plugin. For that we refer to the Snapcraft tutorials mentioned in the introduction.

For those who like to experiment with newer versions of upstream Qt, we provide qt57 and qt58 cloud parts in the parts repository for Qt 5.7.1 and 5.8 (in development). However, the qt57 and qt58 cloud parts do not yet include a wrapper script similar to desktop-launch, so one must be included with with snap configuration, see for example timostestapp2. When using these cloud parts, you should usually omit any Qt/QML package from stage-packages, as the ones compiled from newer Qt are used directly, and you should also omit the after: [desktop-qt5].

Ubuntu app platform snap

The snap files we created in the previous sections contain everything that is needed in order to run the UITK gallery application, resulting in a snap file of 86MB. Here we will explain how to use the Ubuntu app platform snap when you have multiple app snaps that all use the same Qt version.

Benefits of this approach include disk space saving, download time and bandwidth usage if metered.

When your snap uses the ubuntu-app-platform snap for Qt and other platform libraries, we can remove the stage-packages from the snapcraft.yaml file because (in this case), all the needed libraries are included in ubuntu-app-platform. We must also replace after: [desktop-qt5] by after: [desktop-ubuntu-app-platform]. This will set-up your snap to use the global desktop theme, icon theme, gsettings integration, etc. A more elaborate description of the desktop-ubuntu-app-platform is given in the parts list on the Ubuntu wiki. In the uitk-gallery directory we must currently create a directory where the files from the platform snap can be mounted using the content interface:

mkdir ubuntu-app-platform

and this empty directory (mount point) must be added in the YAML file as well. At this point the directory structure is as follows:

uitk-gallery/ .. snapcraft.yaml .. ubuntu-ui-toolkit-gallery/ .. [gallery contents] .. ubuntu-app-platform/

The whole YAML is:

name: uitk-gallery version: '0.3' summary: Showcase gallery that demonstrates the components in the Ubuntu UI Toolkit. description: | See https://developer.ubuntu.com/api/qml/ for the API documentation of the components. ubuntu-app-platform snap must be installed for this snap to work. grade: devel confinement: strict plugs: platform: # plug name, to be used later interface: content content: ubuntu-app-platform1 # content being mounted and the version, currently 1 target: ubuntu-app-platform # the mount directory created default-provider: ubuntu-app-platform # default content source snap, currently the only provider too parts: ubuntu-ui-toolkit-gallery: plugin: dump source: . after: [desktop-ubuntu-app-platform] snap: [ubuntu-ui-toolkit-gallery, ubuntu-app-platform] apps: uitk-gallery: command: desktop-launch "qmlscene $SNAP/ubuntu-ui-toolkit-gallery/ubuntu-ui-toolkit-gallery.qml" plugs: [platform, unity7, opengl]

Again, the new snap file can be created using:

snapcraft

This time, before we can use the snap, the ubuntu-app-platform snap must be installed and connected to the new uitk-gallery snap. So, execute the following commands:

snap install ubuntu-app-platform snap install --dangerous uitk-gallery_0.3_amd64.snap snap connect uitk-gallery:platform ubuntu-app-platform:platform uitk-gallery

Note that the snaps must be connected before running uitk-gallery for the first time. If uitk-gallery has been executed before the snap connect you will see an error message. To fix the problem, uninstall the uitk-gallery snap, then re-install it and run the snap connect command before executing uitk-gallery. This is a known limitation in snapd which will be resolved soon.

Another note: once support for the default-provider, already defined above, will correctly be implemented in snap, there will no longer be a need to install the platform snap separately - it will be pulled from the store automatically and the interface connects automatically.

Evaluation

We demonstrated three different approaches to creating a UITK gallery snap, which we gave the version numbers 0.1, 0.2 and 0.3. For each of the approaches, the table below lists the time needed for the different stages of a snapcraft run, but the pull and build stages have been combined because when doing pull, some of the prerequisites need to be built already. The all stages row shows the total time when running the snapcraft command in a clean directory, so that all stages are executed sequentially, so the value is less than the sum of the previous rows in the table because in each stage it is not necessary to check completion of the previous stages.

Version (bzr revision)

0.1 (r1)

0.2 (r2)

0.3 (r3)

build (includes pull)

1m49s

1m48s

3.6s

stage

7s

7s

1.5s

prime

33s

34s

1.8s

snap

1m11s

1m13s

1.7s

all stages

3m32s

3m20s

4.0s

install

2.2s

2.4s

1.2s

snap file size

86 MB

86 MB

1.3 MB

The measurements were done on a laptop with an Intel Core i5-6200U CPU with 8 GB RAM and an solid-state drive by running each command three times and listing the average execution time. All build-dependencies were pre-installed so their installation time is not included in the measurements. Note that this table only serves as an illustration, and execution times will vary greatly depending on your system configuration and internet connection, but it can easily be tested on your own hardware by bzr branching revisions r1, r2 and r3 of lp:~tpeeters/+junk/blog-snapping-qt-apps.

The times and file size listed in the last column (version 0.3) do not include downloading and installing the ubuntu-app-platform snap, which is 135 MB (it includes more than just the minimal Qt and UITK dependencies of the UITK gallery). It can be seen that (depending on the internet connection speed, and which files were downloaded already), using the ubuntu-app-platform can speed up the pull and build time when creating a new snap file. However, the most important advantage is the reduction of the sum of the file sizes when installing multiple app snaps that all depend on Qt or other libraries that are part of the platform snap, because the libraries need to be installed only once. The disadvantage of this approach is that the app snap must be built using the exact same Qt (and other libraries) version as the ubuntu-app-platform snap, so the choice whether the snap should be fully self-contained or depend on the platform snap must be made individually for each use case.

Future work

The UITK gallery snap is not yet available in the Ubuntu store, so our next step will be to publish a UITK examples snap that includes the UITK gallery, and to set-up automatic publishing of that snap to different channels when we update the UITK or the examples. We will also evaluate what is the best way to make newer versions of Qt available and determine whether we need to provide prebuilt binaries to replace the qt57 and qt58 cloud parts.

Finally, we will determine which libraries need to be included in the ubuntu-app-platform snap. The plan is to include all APIs that are listed on https://developer.ubuntu.com/api/qml/ and if APIs are missing we will add them to that webpage as well as to the platform snap. Of course, if you think we are forgetting a library that is useful and used in many different applications, please leave a comment below.

Launchpad News: Git-to-Git imports

Planet Ubuntu - Tue, 11/15/2016 - 23:48

Launchpad has had Git-to-Bazaar code imports since 2009, along with imports from a few other systems.  These form part of Launchpad’s original mission to keep track of free software, regardless of where it’s hosted.  They’re also very useful for automatically building other artifacts, such as source package recipes or snap packages, from code hosted elsewhere.  Unfortunately they’re quite complicated: they need to be able to do a full round-trip conversion of every revision from the other version control system, which has made it difficult to add support for Git features such as signed commits or submodules.  Once one of these features is present anywhere in the history of a branch, importing it to Bazaar becomes impossible.  This has been a headache for many users.

We can do better nowadays.  As of last year, we have direct Git hosting support in Launchpad, and we can already build snaps and recipes straight from Git, so we can fulfil our basic goal more robustly now with a lot less code.  So, Launchpad now supports Git-to-Git code imports, also known as Git mirroring.  You can use this to replace many uses of Git-to-Bazaar imports (note that there’s no translations integration yet, and of course you won’t be able to branch the resulting import using bzr).

See our Git documentation for more details.

The Fridge: Ubuntu Weekly Newsletter Issue 487

Planet Ubuntu - Mon, 11/14/2016 - 16:24

Welcome to the Ubuntu Weekly Newsletter. This is issue #487 for the week November 7 – 13, 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:

  • Elizabeth K. Joseph
  • Chris Guiver
  • Simon Quigley
  • Paul White
  • 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 487

The Fridge - Mon, 11/14/2016 - 16:24

Welcome to the Ubuntu Weekly Newsletter. This is issue #487 for the week November 7 – 13, 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:

  • Elizabeth K. Joseph
  • Chris Guiver
  • Simon Quigley
  • Paul White
  • 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

Raphaël Hertzog: Freexian’s report about Debian Long Term Support, October 2016

Planet Ubuntu - Mon, 11/14/2016 - 10:15

Like each month, here comes a report about the work of paid contributors to Debian LTS.

Individual reports

In October, about 175 work hours have been dispatched among 14 paid contributors. Their reports are available:

Evolution of the situation

The number of sponsored hours did not change this month. We still need a couple of supplementary sponsors to reach our objective of funding the equivalent of a full time position.

The security tracker currently lists 34 packages with a known CVE and the dla-needed.txt file 29. The situation improved slightly compared to last month.

Thanks to our sponsors

New sponsors are in bold.

No comment | Liked this article? Click here. | My blog is Flattr-enabled.

Dimitri John Ledkov: /boot less LVM rootfs in Zesty

Planet Ubuntu - Mon, 11/14/2016 - 08:11

On Ubuntu many of the default boot loaders support booting kernels located on LVM volumes. This includes following platforms

  • i686, x86_64 bios grub2
  • arm64, armhf, i686, x86_64 UEFI grub2
  • PReP partitions on IBM PowerPC
  • zipl on IBM zSystems
For all of the above the d-i has been modified in Zesty to create LVM based installations without a dedicated /boot partition. We shall celebrate this achievement. Hopefully this means one doesn't need to remove kernels as much, or care about sizing /boot volume appropriately any more.
If there are more bootloaders in Ubuntu that support booting off LVM, please do get in touch with me. I'm interested if I can safely enable following platforms as well:
  • armhf with u-boot
  • arm64 with u-boot
  • ppc64el with PReP volume
ps. boots pic is from here

Jonathan Riddell: Upgrade for KDE neon Security Issue

Planet Ubuntu - Mon, 11/14/2016 - 04:00

Last month we moved the neon archive to a new server so packages got built on our existing server then uploaded to the new server.  Checking the config it seemed I’d made the nasty error of leaving it open to the world rather than requiring an ssh gateway to access the apt repository, so anyone scanning around could have uploaded packages.  There’s no reason to think that happened but the default in security is to be paranoid for any possibility.  The security advisory is out, the archives have been wiped and all packages in User rebuilt so upgrade now to get the new package builds, or for extra security do a reinstall.  The new User Edition ISO is out and I’ll update the website once that gets mirrored enough.  Developer Editions packages are being rebuild now and go directly into the archives so you should start seeing those appear shortly as they are built. Sorry for the hassle folks, you wouldn’t want us to just hide it I’m sure.

 

by

Aurélien Gâteau: Yokadi 1.1.1

Planet Ubuntu - Mon, 11/14/2016 - 00:01

On Friday last week I released version 1.1.1 of Yokadi, the console-based TODO list system. This new version brings the following changes:

  • Improvements:
    • When listing multiple projects, order them alphabetically.
  • Bug fixes:
    • Fixed parse error if the user sets a time of "17m".
    • When the user edits a task with t_edit and removes a keyword, remove the keyword from the task.
    • Made recurrence code work with dateutil 2.6.0.

Nothing earth-shattering, but a few nice to have. You can get it this new version from Yokadi download page or install it directly with pip3 install yokadi.

Eric Hammond: Alestic.com Blog Infrastructure Upgrade

Planet Ubuntu - Sat, 11/12/2016 - 20:10

publishing new blog posts with “git push”

For the curious, the Alestic.com blog has been running for a while on the Git-backed Static Website Cloudformation stack using the AWS Lambda Static Site Generator Plugin for Hugo.

Not much has changed in the design because I had been using Hugo before. However, Hugo is now automatically run inside of an AWS Lambda function triggered by updates to a CodeCommit Git repository.

It has been a pleasure writing with transparent review and publication processes enabled by Hugo and AWS:

  • When I save a blog post change in my editor (written using Markdown), a local Hugo process on my laptop automatically detects the file change, regenerates static pages, and refreshes the view in my browser.

  • When I commit and push blog post changes to my CodeCommit Git repository, the Git-backed Static Website stack automatically regenerates the static blog site using Hugo and deploys to the live website served by AWS.

Blog posts I don’t want to go public yet can be marked as “draft” using Hugo’s content metadata format.

Bigger site changes can be developed and reviewed in a Git feature branch and merged to “master” when completed, automatically triggering publication.

I love it when technology gets out of my way and lets me be focus on being productive.

Original article and comments: https://alestic.com/2016/11/alestic-blog-stack/

Jeremy Kerr: OpenPOWER console implementations

Planet Ubuntu - Fri, 11/11/2016 - 05:13

I often have folks asking how the text & video consoles work on OpenPOWER machines. Here's a bit of a rundown on how it's implemented, and what may seem a little different from x86 platforms that you may already be used to.

On POWER machines, we get the console up and working super early in the boot process. This means that we can get debug, error and state information out using text console with very little hardware initialisation, and in a human-readable format. So, we tend to use simpler devices for the console output - typically a serial UART - rather than graphical-type consoles, which require a GPU to be up and running. This keeps the initialisation code clean and simple.

However, we still want a facility for admins who are more used to a keyboard & monitor directly plugged-in to have a console facility too. More about that later though.

The majority of OpenPOWER platforms will rely on the attached management controller (BMC) to provide the UART console (as of November 2016: unless you've designed your own OpenPOWER hardware, this will be the case for you). This will be based on ASpeed's AST2400 or AST25xx system-on-chip devices, which provide a few methods of getting console data from the host to the BMC.

Between the host and the BMC, there's a LPC bus. The host is the master of the LPC bus, and the BMC the slave. One of the facilities that the BMC exposes over this bus is a set of UART devices. Each of these UARTs appear as a standard 16550A register set, so having the host interface to a UART is very simple.

As the host is booting, the host firmware will initialise the UART console, and start outputting boot progress data. First, you'll see the ISTEP messages from hostboot, then skiboot's "msglog" output, then the kernel output from the petitboot bootloader.

Because the UART is implemented by the BMC (rather than a real hardware UART), we have a bit of flexibility about what happens to the console data. On a typical machine, there are four ways of getting access to the console:

  • Direct physical connection: using the DB-9 RS232 port on the back of the machine;
  • Over network: using the BMC's serial-over-LAN interface, using something like ipmitool [...] sol activate;
  • Local keyboard/video/mouse: connected to the VGA & USB ports on the back of the machine, or
  • Remote keyboard/video/mouse: using "remote display" functionality provided by the BMC, over the network.

The first option is fairly simple: the RS232 port on the machine is actually controlled by the BMC, and not the host. Typically, the BMC firmware will just transfer data between this port and the LPC UART (which the host is interacting with). Figure 1 shows the path of the console data.

Figure 1: Local UART console.

The second is similar, but instead of the BMC transferring data between the RS232 port and the host UART, it transfers data between a UDP serial-over-LAN session and the host UART. Figure 2 shows the redirection of the console data from the host over LAN.

Figure 2: Remote UART console.

The third and fourth options are a little more complex, but basically involve the BMC rendering the UART data into a graphical format, and displaying that on the VGA port, or sending over the network. However, there are some tricky details involved...

UART-to-VGA mirroring

Earlier, I mentioned that we start the console super-early. This happens way before any VGA devices can be initialised (in fact, we don't have PCI running; we don't even have memory running!). This means that it's not possible to get these super-early console messages out through the VGA device.

In order to be useful in deployments that use VGA-based management though, most OpenPOWER machines have functionality to mirror the super-early UART data out to the VGA port. During this process, it's the BMC that drives the VGA output, and renders the incoming UART text data to the VGA device. Figure 3 shows the flow for this, with the GPU rendering text console to the graphical output.

Figure 3: Local graphical console during early boot.

In the case of remote access to the VGA device, the BMC takes the contents of this rendered graphic and sends it over the network, to a BMC-provided web application. Figure 4 illustrates the redirection to the network.

Figure 4: Remote graphical console during early boot, with graphics sent over the network

This means we have console output, but no console input. That's okay though, as this is purely to report early boot messages, rather than provide any interaction from the user.

Once the host has booted to the point where it can initialise the VGA device itself, it takes ownership of the VGA device (and the BMC relinquishes it). The first software on the host to start interacting with the video device is the Linux driver in petitboot. From there on, video output is coming from the host, rather than the BMC. Because we may have user interaction now, we use the standard host-controlled USB stack for keyboard & mouse control.

Figure 5: Local graphical console later in boot, once the host video driver has started.

Remote VGA console follows the same pattern - the BMC captures the video data that has been rendered by the GPU, and sends it over the network. In this case, the console input is implemented by virtual USB devices on the BMC, which appear as a USB keyboard and mouse to the operating system running on the host.

Figure 6: Remote graphical console later in boot, once the host video driver has started.

Typical console output during boot

Here's a few significant points of the boot process:

3.60212|ISTEP 6. 3 4.04696|ISTEP 6. 4 4.04771|ISTEP 6. 5 10.53612|HWAS|PRESENT> DIMM[03]=00000000AAAAAAAA 10.53612|HWAS|PRESENT> Membuf[04]=0C0C000000000000 10.53613|HWAS|PRESENT> Proc[05]=C000000000000000 10.62308|ISTEP 6. 6

- this is the initial output from hostboot, doing early hardware initialisation in discrete "ISTEP"s

41.62703|ISTEP 21. 1 55.22139|htmgt|OCCs are now running in ACTIVE state 63.34569|ISTEP 21. 2 63.33911|ISTEP 21. 3 [ 63.417465577,5] SkiBoot skiboot-5.4.0 starting... [ 63.417477129,5] initial console log level: memory 7, driver 5 [ 63.417480062,6] CPU: P8 generation processor(max 8 threads/core) [ 63.417482630,7] CPU: Boot CPU PIR is 0x0430 PVR is 0x004d0200 [ 63.417485544,7] CPU: Initial max PIR set to 0x1fff [ 63.417946027,5] OPAL table: 0x300c0940 .. 0x300c0e10, branch table: 0x30002000 [ 63.417951995,5] FDT: Parsing fdt @0xff00000

- here, hostboot has loaded the next firmware stage, skiboot, and we're now executing that.

[ 22.120063542,5] INIT: Waiting for kernel... [ 22.154090827,5] INIT: Kernel loaded, size: 15296856 bytes (0 = unknown preload) [ 22.197485684,5] INIT: 64-bit LE kernel discovered [ 22.218211630,5] INIT: 64-bit kernel entry at 0x20010000, size 0xe96958 [ 22.247596543,5] OCC: All Chip Rdy after 0 ms [ 22.296864319,5] Free space in HEAP memory regions: [ 22.304756431,5] Region ibm,firmware-heap free: 9b4b78 [ 22.322076546,5] Region ibm,firmware-allocs-memory@2000000000 free: 10cd70 [ 22.341542329,5] Region ibm,firmware-allocs-memory@0 free: afec0 [ 22.392470901,5] Total free: 11999144 [ 22.419746381,5] INIT: Starting kernel at 0x20010000, fdt at 0x305dbae8 (size 0x1d251)

next, the skiboot firmware has loaded the petitboot bootloader kernel (in zImage.epapr format), and is setting up memory regions in preparation for running Linux.

zImage starting: loaded at 0x0000000020010000 (sp: 0x0000000020e94ed8) Allocating 0x1545554 bytes for kernel ... gunzipping (0x0000000000000000 <- 0x000000002001d000:0x0000000020e9238b)...done 0x13c0300 bytes Linux/PowerPC load: Finalizing device tree... flat tree at 0x20ea1520 [ 24.074353446,5] OPAL: Switch to little-endian OS -> smp_release_cpus() spinning_secondaries = 159 <- smp_release_cpus() <- setup_system()

we then get the output from the zImage wrapper, which expands the actual kernel code and executes it. In recent firmware builds, the petitboot kernel will suppress most of the Linux boot messages, so we should only see high-priority warnings or error messages.

next up, the petitboot UI will be shown:

Petitboot (v1.2.3-a976d01) 8335-GCA 2108ECA ────────────────────────────────────────────────────────────────────────────── [Disk: sda1 / 590328e2-1095-4fe7-8278-0babaa9b9ca5] Ubuntu, with Linux 4.4.0-47-generic (recovery mode) Ubuntu, with Linux 4.4.0-47-generic Ubuntu [Network: enP3p3s0f3 / 98:be:94:67:c0:1b] Ubuntu 14.04.x installer Ubuntu 16.04 installer test kernel System information System configuration Language Rescan devices Retrieve config from URL *Exit to shell ────────────────────────────────────────────────────────────────────────────── Enter=accept, e=edit, n=new, x=exit, l=language, h=help

During Linux execution, skiboot will retain control of the UART (rather than exposing the LPC registers directly to the host), and provide a method for the Linux kernel to read and write to this console. That facility is provided by the OPAL_CONSOLE_READ and OPAL_CONSOLE_WRITE calls in the OPAL API.

Which one should we use?

We tend to prefer the text-based consoles for managing OpenPOWER machines - either the RS232 port on the machines for local access, or IPMI Serial over LAN (SOL) for remote access. This means that there's much less bandwidth and latency for console connections, and there is a simpler path for the console data. It's also more reliable during low-level debugging, as serial access involves fewer components of the hardware, software and firmware stacks.

That said, the VGA mirroring implementation should still work well, and is also accessible remotely by the current BMC firmware implementations. If your datacenter is not set up for local RS232 connections, you may want to use VGA for local access, and SoL for remote - or whatever works best in your situation.

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