Home Home
Sign up | Login

Author Archive

« Older Entries

CLI to upload image to openstack cloud

April 18th, 2012 by

I work on automatic testing of one of our products that creates other projects.
And because there is a lot of clouds everywhere I want to use them too. We
have internally an OpenStack cloud (still Diablo release). So I need to solve
automatic uploading of images built in the Build Service. Below I describe my working version.

(more…)

Tags: , ,
Posted in Programming, Quality Assurance, Uncategorized, Virtualization | No Comments »

Temporary overwrite method for specific task

March 18th, 2011 by

Hi,
today I must solve issue with not well structured code. Problem is that one method return last correct version, but in one specific case it needs to return newest version (even incorrect). There is many calls between top level method which know what needs to call and target method which is called from generic code. Now I need to fix it and code is not well tested and quite sensitive to changes ( this fix is fix of another fix :) . So what is the safest way to change it?
I decide that the best solution which doesn’t change almost nothing ( but is suitable just for maintenance update, for trunk I create better solution ) is temporary overwrite of target method to change its behavior. Now how to do it?
There is simple example:

class T
  def test
    puts "test"
  end

  def lest
    puts "lest"
  end

  def m
    test
  end
end

T.new.m
T.send(:define_method,:m_a) { lest }
T.send(:alias_method, :m_old, :m)
T.send(:alias_method, :m, :m_a)
T.new.m
T.send(:alias_method, :m, :m_old)
T.send(:undef_method, :m_a)
T.send(:undef_method, :m_old)
T.new.m

as you can see after modification class is exact same as before ( except if there is method a, but it is possible to handle it via introspection and dynamic choose of method). I don’t need to change whole stack of calls to add parameter or introduce new singleton class which can have flag.
I hope it help someone with his fix of not so well written piece of software.

Tags: ,
Posted in Miscellaneous | 2 Comments »

Easy scripting actions with susestudio alias new rubygem studio_api

December 23rd, 2010 by

Hi,
Now I work for SLMS ( Suse Lifecycle Management Server ) project. It cooperate with SuSE studio and use its API. I get idea that more people could benefit from easy access to studio API from ruby so I extract functionality and improve behavior, documentation and testing and now there is new rubygem studio_api.
Why you should use this gem?

  • ActiveResource Behavior
  • Actively maintained ( and will be due to SLMS support )
  • Tightly developed with guys from studio team
  • Well documented with yard
  • Good test coverage

(more…)

Tags: , ,
Posted in Miscellaneous | Comments Off

Hackweek 5 – LXDE

June 8th, 2010 by

Hi,

as hackweek continue I want to present my contribution for this year event. My plan is to support our the youngest supported desktop environment LXDE. So I contact our LXDE guy Andrea Florio and he ask lxde developers. Then we communicate directly and I found as the most intersting idea to replace gnome gvfs which is needed to have usable gio interface in glib ( geek-deserialization: allow easy access remote systems, zip archives in file manager like it is part of filesystem). Motivation for replacement is quite big gvfs dependency and system resource requirements. It choose it because I can learn something new, can return to programming in C from Ruby on Rails which is used for webyast and last not least I think it is usable also for another lightweight environment xfce4.

Code can be located in pcman git repository. Idea of implementation is quite simple. Don’t use daemons and special code to handle different backends. Instead use fuse and its already written fs based on fuse. As first I start with ftps and its sshfs implementation. Code for single fs is simple and short. Today I finish first working proof of concept of gvfs extension and its gfile extension. It can query and copy file on gvfs as you can see in file gfusevfs.c where is testing program. Main problem which I still see is that fs is not umounted so it takes some sources, but umount it after file operation can lead to annoying behavior like passing password on each file operation.

I welcome any comments and ideas about this project.

Posted in Desktop | 1 Comment »

Encrypted directory

December 3rd, 2009 by

I have notebook which contain private data and I don’t want anyone to read it even if my notebook will be stolen. Encrypted whole home partition is too much as my home directory contains also svn or git repositories which could anybody read. So I create encrypted directory in home directory which contain all private data and rest is normal accessible. So how to do it? (more…)

Posted in Base System | 1 Comment »

Ruby on rails, Ajax and memory watching

May 14th, 2009 by

As work on webinterface for YaST is in progress we must learn new technologies suitable for web development. WebYast will be written in ruby and ruby on rails framework. Also because WebYast is new interface it could contain AJAX features for better user comfort. Today I found that ajax support in RoR is on good level and with documentation it takes few minutes to create first example which show current used memory on server. It is not connected anyhow to YaST because I want to focus on AJAX.
And here is a code. It update page every fifth second (but not refresh only update div, on bigger page it is really significant):
/views/home/index.html.erb:
<%= javascript_include_tag :defaults %>
<h1>Hello world!</h1>
<%= periodically_call_remote(:url => { :action => 'get_averages' }, :update => 'avg',:frequency => '5') %>
<div id="avg">
Memory usage is X MB </div>
controllers/home_controller.rb:
class HomeController < ApplicationController
   def index
   end
   def get_averages
     output = `free -m` # bash solution - | sed 's/Mem:[^0-9]+[0-9]+[^0-9]+([0-9]+).*$/1/;2q;1d'`
     output = $1 if (output =~ /.*n(.*)n.*n.*n/) #let live second line
     output = $1 if (output =~ /.*:s+S+s+(S+)s+/) #second field
     render :text => "Usage mem is "+output+"MB RAM."
   end
end

And thats all to watch your server usage.

Posted in YaST | Comments Off

Edit system on iso image

April 2nd, 2009 by

I start maintaining yast2-repair and first bug which I start solving is that repair from DVD menu doesn’t work same as from installation menu. Find where is problem and also test if fix is correct is not trivial. I describe below how to modify inst-sys on DVD or software on LiveCD.

(more…)

Posted in Base System, Systems Management | 1 Comment »

Zypper: Improved bash completion and practical usage

February 12th, 2009 by

Because no one reported any bugs to perl-Bootloader, I have some free time. I use it to improve bash completion for zypper, because I find current one have some really annoying things. In short now completion work also for zypper global options, hint also for short version of commands and help name of repo, service and lock, if you use command which takes that as argument. Next few paragraphs contain practical examples how it help improve your command line productivity, how to get it to your system and also some notes how I implement it. (more…)

Posted in Software Management, Usability | 9 Comments »

What changed in perl-Bootloader between 11.0 and 11.1

December 18th, 2008 by

I start with history. After 11.0 I became maintainer of perl-Bootloader (I never before write anything in perl, but know some other scripting language, so it is not so hard learn another one) after Alexander. Problem is that alexander doesn’t have enough time for maintainer it (he is also leader of arch team). This mean I get many unresolved bugs (around 150), because lack of resource prevents fixing it. Also I get some features to implement and some enhancement I found enough useful (some idea start in bug reports or on factory mailing list, so thanks community) to implement it. I describe what succeed and what not in rest of this blog entry. (more…)

Tags:
Posted in Base System | 6 Comments »

New software in build service

November 18th, 2008 by

I try testing xfce4 desktop and find some bugs. But I also find that some really interesting missing in opensuse build service, so I add two new applications to build service (gnome community repository…but now gaupol is available only in my personal repository, because in gnome pygtk wait for python 1.6) – osmo and gaupol.
(more…)

Posted in Build Service, GNOME, Packaging, XFCE | 2 Comments »

« Older Entries