Viewing posts for the category SoC
The development of SBackup was very stale for most of this year, mostly because many of the bug/feature that user were requesting required a significant rewrite of the codebase and at the same time I saw how messy the code has become over time. A few people came up and offered some help, but out of that only new icons and a command-line parameter parser were fully developed - other developers just took a task or a an idea and disappeared.
Remote restore fixed. Full planned functionality reached.
All that I planned to do for Simple Backup is done as of version 0.7.
Now I only need to wait for the evaluation from my mentors at Ubuntu and to fix all bugs they and all other users find :D
I also did a bit of refactoring in this release oriented towards less memory usage. Results:
Ok, now the 0.5 release of my Simple Backup suite can now actually restore something from your backups! (both command-line and Gnome interfaces) It now even does automatic backups (and not just claims that it does). It even doesn't store empty folders in the backup. Oh and some usability fixes are also thrown in for no extra charge. :)
Note: due to a small, tiny bug in gnomevfs, restoring files from remote backup locations doesn't work yet. I'll have to do a lot of hacking to get that working :P
This week was a productive for me, but I did run into some unexpected
technical difficulities and thus had to work throught the weekend to
I just did the 0.3 release on freashmeat and sourceforge.
* backend daemon - ok
* GUI configurator - ok
* commandline restore - 50% (need to write a directory extraction
function that is missing from python tarfile module)
* GUI restore - 95% (depends on command line restore)
* GUI to write a backup snapshot to cd - 0%, optional
Of course extensive optimisation, testing and polishing is quite needed too.
I should be able to finish the restore tools tomorrow if no other
major problems occur.
I am behind my planned schedule by allmost two days, mostly because tarfile module for Python is ... not too complete, for example you can only extract files one by one :P
It looks like I will have to implement extraction of directories myself. Of course I will send it to the tarfile upstream authors, along with something heavy ...
Still writing a restore tool :(
Last two hours were spent debugging an interesting problem with TreeView in PyGTK. It was too slow to parse and add all files from a backup snapshot to the tree view at once (not to mention that it took 35 Mb of RAM :P), so I decided to load the tree as needed - I would add the children of a node only when this node gets expanded. So I happily wrote a handler to 'row-expanded' event that does just that - adds some children to the newly expanded node.
Note: as the node cannot expand if it doesn't have some children already, I also add a dummy child to all directory nodes
Then the problem came up - once I enabled my handler, the nodes would not expand anymore: the expansion handles were there, I could click on them and see the CPU being chewed away by the parsing of the 6 Mb nodelist, but nothing changed in the interface - even the dummy node didn't come up.
That confused not only me, but also #pygtk people. I wrote a 15 line simple script to replicate the problem, but everything worked fine there :O. At this point I started commenting stuff out at random and found out that breaking the link between treestore and treeview (recommended in docs to avoid excessive updates) resets the expansion state. Doh.
But it was not the end yet. After that I noticed that the nodes didn't expand on the first try, but only on the second. 8) After some mental mummbo-jummbo I came to an idea that proved to be dumb, but correct. Prepare for a gem boys and girls - if, in the process of execution of row-expanded handler, at at least one point the expanding node has no children (like when you have removed the dummy node, but still haven't added the real ones) - the expansion doesn't happen!
Two bugs^Wfeatures with the same effect. Oh, the fun of debugging never stops :D
Simple Backup Solution 0.1 is out !
With this simple and humble name my SoC project has met the first milestone - I have a fully functioning backend for my backup solution. The GUI is to be done next week.
You can get see the spec here, get the 0.1.1 version here and monitor all my development activity via my online repository. (You can access it with your web browser or with bazaar-ng.)
A Debian package will be uploaded after completion of all planned functionality, i.e. in a couple of weeks.
Currently I am very busy writing my Summer of Code project. You can see my plan on the Ubuntu wiki: http://udu.wiki.ubuntu.com/SimpleBackupSolution and follow my progress in my bazaar-ng repository.
I must say that bazaar-ng is a simple as subversion and as powerful as arch, but as complete as current Xorg package for Ubuntu unstable (aka breezy) ;P
I am writing all of this SoC code in python which is my first real life exposure to this language. I am deeply impressed by the easiness of the language, but slightly depressed by the lack of documentation in some areas, for example python-gnome modules are mostly undocumented. While the simple stuff can be scoped out from some examples, a more advanced use would require much guesswork.
I like that in python everything is an object and that objects with similar interfaces are interchangeable, for example: Tarfile module makes .tar archives. It would really like to write them out to a file, but will also accept a fileobj. It acctually only need this object to have a proper write() function, so a Handle from Gnome-vfs module should do nicely there. That would allow a transparent reading/writing of the resulting .tar to any destination supported by Gnome-VFS.
Now that is cool.
I am writing a backup daemon now. The due date for this is tomorrow. I have local plain file and local .tar backups working. I still have to make Gnome-vfs .tar backups work as intended, make incremental backups work and do some configuration file parsing. Also a simple restore utility must be done 'till tomorrow. I might just make it :)
(GUI tools are scheduled for the next week)
My proposal for the Google Summer of Code was accepted. In this summer I'll be writing http://udu.wiki.ubuntu.com/SimpleBackupSolution
I am so hyped!