Monthly Archive for Februar, 2009

Since the features of KDE4 were announced I was eager to try out the promised semantik desktop. Since I’ve been working on onologies once, I know that it is a great idea, but sometimes difficult to implement. So I wanted to see how the KDE guys did implement this. Sadly it didn’t work on Debian very well since the Debian packagers, did not – for some very good reasons – package the sesame2 backend for nepomuk which is required to get the most out of strigi/nepomuk. Today I was thinking about nepomuk again and was lucky to find a very good explaination how to get sesame2 for nepomuk running on Debian sid with KDE4.2 form experimental. The post I found is in german, so I’ll give a quick summary of what I’ve done here:

• First you should get your system up-to-date: apt-get update && apt-get upgrade
• Then install the required packages: apt-get install libqt4-dev build-essential cmake subversion qmake strigi-utils sun-java6-jdk sun-java6-jre
• I prefer sun-java6, but you could also use openjdk-6-jre and openjdk-6-jdk instead.
• Now checkout the kdesupport sources: svn co svn://anonsvn.kde.org/home/kde/tags/kdesupport-for-4.2/kdesupport
• Change to the source directory: cd kdesupport/soprano
• Create the build directory for cmake: mkdir build
• Go into the build dir: cd build
• Now you have to properly set JAVA_HOME: export JAVA_HOME=/usr/lib/jvm/java-6-sun, use /usr/lib/jvm/java-6-openjdk for openjdk
• Create the makefiles: cmake ..
• This should emit something like this:

  ---------------------------------------------------------------------------------------
  -- Soprano Components that will be built:
     * Sesame2 storage backend (java-based)                                                                        
  
  -- Soprano Components that will NOT be built:
     * Redland storage backend
     * Raptor RDF parser
     * Raptor RDF serializer
     * The CLucene-based full-text search index library
  ---------------------------------------------------------------------------------------
  -- Configuring done
  -- Generating done

• Now compile using make: make
• And install: sudo make install. Please note that this will install the backend into /usr/local.
• Then you should (re-)move your old redland repository: rm -rf ~/.kde4/share/apps/nepomuk. You’ll loose all your existing metadata (tags, ratings, etc.) this way. So maybe you want to backup this information instead.
• You should stop strigi and nepomuk now in the system settings dialog of KDE.
• Then edit the configuration file in ~/.kde4/share/config/nepomukserverrc with your favourite editor and change it like this:

  [Basic Settings]
  Configured repositories=main
  Start Nepomuk=true
  
  [Service-nepomukmigration1]
  autostart=false
  
  [Service-nepomukstrigiservice]
  autostart=true
  
  [main Settings]
  Storage Dir[$e]=$HOME/.kde4/share/apps/nepomuk/repository/main/
  Used Soprano Backend=sesame2
  rebuilt index for type indexing=true

• Now you can enabled nepomuk and strigi again. Strigi should display an icon in the system area and you should see /usr/bin/nepomukservicestub nepomukstorage eating up a lot ressources.

Of course you can use aptitude instead of apt-get if you like.

Since the features of KDE4 were announced I was eager to try out the promised semantik desktop. Since I’ve been working on onologies once, I know that it is a...