Luggage and RyanAir

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FOSDEM ended yesterday and here I am sitting at Charleroi Airport (also known as “Brussels South”, quite a misleading name given that it’s 80 Km from Brussels).

I have already passed all controls, check-in and everything. While I wait for boarding, I am watching the shameful spectacle of airport personnel (let me reiterate that: airport personnel, not Ryanair’s) enforcing RyanAir’s 10 Kg cabin baggage limit. According to RyanAir, they want to minimize the weight the plane carries to use less fuel. So far, so good.

Here is what I have seen: people who do not carry any baggage (very few, they have probably checked it in because it exceeded size or weight), people who are below the 10 Kg limit and people who are way over it (and have been told to check luggage in). I am OK with those cases.

There is still a fourth case: people who are slightly over 10 Kg.

I’ve seen a woman whose bag was 10.15 Kg to be told to pay 20 EUR to check her bag, or go back to the RyanAir desk to check-in the bag. She opened her bag, took a scarf, put it on and now the bag matched the weight limit.

Yes, RyanAir is charging 20 EUR/Kg for hand baggage from 10 Kg on. What a rip-off.

A couple of East-European girls were about 1 Kg in excess each. They put a couple of extra jumpers on and now baggage was under 10 Kg.

Many people were about 1 Kg in excess. When they were told their suitcase better got lighter or pay 20 to 40 EUR. Most of them just took something (camera, food, slippers, whatever) and put in the pockets of their coats. Fortunately, RyanAir is not charging for body and clothes weight (yet?).

In all those cases the plane will end up transporting the same weight and RyanAir won’t get one more dime, so why RyanAir? Why are you such a shameful company? Why are you enforcing ludicrous and pointless policies? Don’t you know after passing the control everybody just put everything back into the suitcase? Of course you do.

So after watching this ridiculous spectacle go on for a while, I had a devious idea: let’s organize a fat people conference and fly them all over to and from using RyanAir. Further, all of them should carry exactly 10 Kg hand baggage.

Bootstrap your CMake project

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When I talk to people about the CMake build system, they like the fact that it generates native project files for the tools you already use (which makes possible to use distributed compiling, debugging, etc). Next to that, Visual Studio and autotools users complain about bootstrapping not being possible.

If you are using Visual C++, solutions probably work fine for you and it is a fact they work out of the box with VC++. However, do not even try to move to another platform (Linux, Mac…) or another compiler on Windows because it will not work.

If you use autotools, you generate the configure script on your development machine and your users just run it to prepare makefiles. Only a Bourne-compatible shell is required when trying to build. Moving to Windows, particularly Visual C++ will be quite hard.

CMake is in my opinion one of the best build-systems out there but there is one problem: you need to have CMake in order to build a CMake-based project.

Now add third-party dependencies, which probably use a different build-system, to the mix and suddenly building your software has become time-consuming and complex. In terms of money, that translates to lost revenue because there is a high probability people evaluating your software will give up before they even have something to test.

Nokia solves this by distributing Qt binaries for the most popular compilers (MSVC2005, MSVC2008, MinGW). But there is always someone using a different compiler: MSVC2010, a different flavor of MinGW, Embarcadero C++ Builder…

KDE on Windows solves this by having its own “meta-buildsystem” called emerge, which is written in Python, which adds a dependency on Python when you want to build.

Can’t we do better? Can we get all the advantages of CMake yet not depend on CMake being available?

Yes, we can. I tried to do that for Wt and implemented it in the form of winstng. It’s a small batch file for Windows and a Bash shell script (for Unix; I didn’t manage to remove one bashism) which automagically download, build (if needed) and install CMake, all the third-party dependencies, build them, and then download Wt and install it. Everything ends up in a self-contained location which you can move around*. And you do not need administrator permissions. Tested on Windows, Linux and Mac.

*For now that’s only true on Windows, on Unix platforms I have not removed the rpath for some libraries which use build systems other than CMake (namely, OpenSSL).

BTW, if you are at FOSDEM, there is a Wt talk on Sunday, 14.30-15.15: The next desktop is the browser.

FOSDEM 2011

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Another year, another FOSDEM. Yay, I’m attending again! The biggest open source event in Europe, with more than 200 conferences and 5,000 people.

This year I will be talking about KDE on Windows. Sunday, 10.15, CrossDesktop Room (H.1309). If you are interested in helping us with KDE on Windows development, in making use of KDE on Windows for your application, or just want to use your favorite KDE applications on Windows, then you should come.

Request to Linux distributions

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Do not waste my hard disk!

I recently acquired an 2 TB hard disk drive, which I immediately formatted with ext4. Given that mkfs.ext4 defaults to 5% reserved blocks for too, that amounts to 100 GB of lost* space.

Wow. 100 GB. On a desktop machine. For root.

While mkfs belongs to e2fsprogs, I think this requires action on the distributions side. Let me explain.

If you are installing a server, 5% makes perfect sense: there are a lot of logfiles, updates, potential break-ins and other disasters-to-happen for which root-reserved space will be preciously required. 5% is a good choice here. If 5% is too much (or too little), it will not matter: any decent sysadmin knows mkfs.ext4 -m and tune2fs -m (if you don’t, Martin will teach you).

On the other hand, if you are installing Ubuntu on your laptop, you probably don’t know shit about mkfs, tune2fs, 5%, etc. You only know by removing Windows and installing Linux you’ve magically lost 100GB of space. Vanished.

So here is my request to Linux distributions: when installing a distribution in “desktop profile” (i. e. not Debian in “server” profile, RHEL, SLES, Ubuntu Server, etc), DO NOT RESERVE 5% to root. 100 or 200 MEGABYTES should be more than enough.

* Yes, I know it’s not really “lost” but just “unusable by normal users” but that technicality doesn’t matter to 99% of the people out there.

First interview in BehindKDE

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I have started a new series in BehindKDE, the Platforms series. In this series, I will talk with developers of all the platforms KDE is available for: Windows, Mac, BSD, Solaris, Haiku (!), etc. Linux will be included in the form of KDE packagers for several distributions.

The first interview has just been published, it’s a long conversation with Patrick Spendrin (SaroEngels) about KDE on Windows, the technology they (we 🙂 ) are using, its current state and the challenges KDE faces on Windows.

I’m starting contacts with other developers for the next 2-3 interviews. If you want to make a proposal (a developer you’d like to have interviewed, questions you’d ask, etc), please add a comment to this blog post, or contact me by e-mail or IRC.

By popular request: Kopete KIPI plugin

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Should we call it Kipiopete? 😀

Every time I blog about KSnapshot or KIPI, people comment or even e-mail me asking for the same feature: make it possible to send pictures directly to a contact in Kopete.

I thought I’d need to fiddle with Kopete internals, or even wait until KDE Telepathy would be ready, but no: it turned to be very very easy thanks to the rich DBUS interface Kopete implements. Once more, the best way to implement this turned out to be a KIPI plugin, which means you can now also send to your contacts your photos from Digikam, your pictures from Gwenview, etc. Yay!

Mandatory screenshots:

Wait a second! What was that last screenshot? It looks like KSnapshot works on Windows!? Sort of, more on that soon.

A few warnings, though:

  • Facebook does not allow file transfers but Kopete < = 4.5.4 wrongly reports Facebook contacts as being able of accepting files. If you try to send a picture to a Facebook contact, the transfer will fail. This is fixed in Kopete 4.6 (i. e. the KIPI Kopete plugin no longer shows Facebook contacts).
  • For some reason, Pidgin does not accept several files at once. It seems Kopete tries to send them too fast, or something like that. KMess, on the other hand, has no problem accepting all my photo collection at once via MSN Messenger.

KIPI plugin for screenshots.debian.net

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The screenshots.debian.net site is a public repository of screenshots taken from applications contained in the Debian GNU/Linux distribution and its derivates like Ubuntu.

It was created by Cristoph Haas to help people get an impression of what a certain software will look like on your desktop before you install it. Everybody can take screenshots and upload them through the upload form. So far there are about 3100 screenshots, which is actually a small number if you consider Debian Squeeze contains about 15000 source packages

After I hacked a bit on KSnapshot, the KDE snapshot tool, Sune asked me to add an export to screnshots.debian.net command. I had not thought of it before but that looked like a great idea, it would make the process or taking-screenshot, visit-upload-form, upload-each-screen so much easier!. So I started to develop my first KIPI plugin.

Here is the resulting Debian Screenshots plugin, as you would use it in KSnapshot:

Being a KIPI plugin, it is available not only from KSnapshot but also from Digikam, Gwenview and the other applications which support KIPI plugins:

Which makes me think: what about having a debshots (the software powering screenshots.debian.net) installation over at kde.org and have screenshots for all the KDE applications? What do you think? Promo team? Sysadmins? Setting it up shouldn’t be difficult: I’m no Python or Pylons expert (I’m more of a Ruby and Wt C++ guy 🙂 and got it running in a VM in an afternoon, even solving some SQLAlchemy 0.6 issues.

KSnapshot gets social

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When I blogged about the freehand region capture feature I added to KSnapshot a couple of weeks ago, it caught me by surprise that post quickly turned into a wishlist for KSnapshot. I didn’t expect people missed anything in our good old KSnapshot after so many years of development.

Some of the feature requests were very difficult to implement (antialiasing in freehand capture; drop me an e-mail if you know how to do without redrawing the whole selection polygon)[DONE thanks to kdepepo, will be in 4.6] but most of them are pretty reasonable, in my opinion: include mouse pointer, annotations, send to mail, send to Facebook, print, etc.

I quickly started looking into how to e-mail the picture, how to print it, how to send to Facebook, etc, which seemed quite some work. And then Aleix pointed me to a very easy and quick way of getting all those and more in KSnapshot: the KIPI plugins Gwenview, Digikam and others are using.

This is the result:

Now you can send you ksnapshots to Facebook:

Or print your screenshot:

KSnapshot gains free-region capture

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From time to time I need to take a screenshot of some application or a part of my desktop. The obvious solution in KDE is KSnapshot, which is perfect if you want a rectangularly-shaped picture.

Unfortunately, sometimes I want to capture something not rectangular, something which looks more like an ellipse, or even some odd shape. That means I have to take the snapshot, go to Krita, edit and save. Four steps. Ugh.

No more!

I have just committed free-region capture to KSnapshot, which makes possible to capture arbitrary shaps:

Now you can capture only the nice logo from our friends over at the Libre Software World Conference, no need to take a rectangle with a lot of background color:

And this would be the result:

Isn’t it nice?