Category Archives: Architecture logicielle

Stop using GIT for synchronizing files!

Well, this quick blog post is a sort of a quick rant.

That’s the second time I see someone trying to use GIT for binary files synchronization. That’s true, it’s quite easy to create a local GIT repository, then adding a remote is a piece of cake and “TADA” local commits could be pushed to the remote than from there cloned / pulled into another machine. But! Because there’s a really big “BUT”!

Remember for what GIT was designed. That’s right, source file handling, with history and merging. What are source files? They are text files, yes. That’s not binary. GIT can actually compare successive version and only handle diffs (patches). Have you tried using the patch tool with binary files? That makes you laugh, isn’t it! So why using GIT for file sync won’t you also make you laugh? Should I continue now? 😉 Well, I should continue, because GIT also has history. So you’ll force it to store every binary version you ever had, into it’s little .git directory. Is that what you really want?

If file synchronization is needed, then consider rsync, unison or equivalent tools, pretty please.

KWallet needs a serious face-lift ; enter KSecret Service

Users are often confused by the current KWallet system behavior. When their computers start, they enter the KDE session password but just after logging-in, they are prompted yet another password, for something named KWallet. Sometimes, they even see several password prompts from KWallet, depending on their precise desktop configuration.

Some users find that annoying and they file bug reports or, even worse, simply uncheck the “Enable the KDE wallet subsystem” in an attempt to deactivate it as a whole and switch to using some other external tools. Well, these tools are OK, but the KDE experience is affected, as the applications are no longer able to correctly store and retrieve their secrets. And that raises the barrier to entry for some of our potential users, adding negative points against KDE.

The remaining users have now several devices and would like to have their passwords synchronized all over these devices. They won’t find this kind of function and they’ll start using some other external tools, providing cross-device synchronization. That’s another bad point for the KDE experience.

Finally, more advanced users would like to know where their wallet data is stored and they would like to be able to put their wallets in some places of their choice, perhaps in an owncloud synchronized directory.

Enter KSecret Service!

The KDE Wallet system has some design flaws (I’ll write more on that in the future, but right now my post risk to get too long) affecting the security and should be replaced ASAP. Back in 2008 and until or 2011 an initiative was taken by the former KDE Wallet maintainer Michael Leupold and Stef Walter from GNOME to create a interface aiming to replace it. It’s called “Secret Service” and the draft may be found here:

This interface is already implemented by GNOME keyring and AFAICT KDE should also implement this interface if it wanted to enhance users experience.

All these points will be addressed by a new system, aiming to replace KWallet. It’s name is already known – KSecret Service.

I’m in the process of (re)defining it’s architecture and I’ll post it, for feedback, on the KDE developer mailing list as soon as I’ll get something stable enough. I cannot tell more right now – the post is already long enough – but it’s an ambitious plan! And I’m sure you’ll like it!

Qui a dit que C++ était pour les anciens ?

Jeudi aura lieu la convention global C++ – voir ce lien, par exemple. Sur ce billet, nous aurons la surprise de voir que la moitié des inscrits ont moins de 30 ans et que le plus jeune inscrit n’a que 15 ans ! Cela dit, les nouveautés du nouveau standard C++11 mettent Java et C# dans la confusion, voir l’inutilité (mais c’est bien-sûr mon avis). En tout état de cause, le sentiment que j’avais à l’époque où je me suis tourné vers ces deux derniers langages, d’avoir abandonné quelques chose sans retrouver mieux, est entièrement confirmé par ce nouveau standard. A suivre…