[SM-Discuss] KDE 4 installation (and co-installability with KDE 3)
treeve at scarlet.be
Sun Jan 6 08:50:14 EST 2008
On Sunday 06 January 2008 14:35:42 Juan Carlos Torres wrote:
> Greetings fellow mages!
> Thanks to the fixes done to the KDE 3 kdelibs spell (thanks Treeve and
> Jaka!), I was finally able to test out our kde4 spells (just a few days
> short of KDE 4.0's official release). So far it was been successful,
> although I've only cast the basic modules (kdelibs4, kdepimlibs4, kdebase4,
> I've run a bit into some concerns which I'd like to bring up here,
> specifically about KDE3/Qt3 and KDE4/Qt4 co-installability. I'm not sure
> whether they should be addressed on the spell level (might need a patch or
> change of PATHs), or let the user resolve them themselves (probably with
> some notes on how to do so).
> 1. Qt 4 binaries and libraries
> At most, KDE 4 needs qdbus in order to start. qdbus is only available in Qt
> 4. Currently, we install Qt 4 binaries in /usr/bin/qt4/. However, this path
> is not automatically added to the system path, so qdbus is not found when
> starting a KDE 4. The user can probably just add it to his own path, but he
> will have to do it for every user that will try to start a KDE 4 session.
> No problem if he only has one user.
> I'm not sure about any other Qt3-Qt4 conflicts that might arise, like other
> binaries or libraries (I'm no lib expert in that area yet). But so far I
> haven't run into any yet.
> 2. KDE 4 Session and KDM
> A kde4.desktop file is installed by kdebase-workspace4
> in /usr/share/xsessions/ in order to add a KDE4 entry to KDM's (or probably
> any display manager's) Sessions menu. However, kdmrc is not set by default
> to read from that directory. It reads from the default
> directory /usr/share/apps/kdm/sessions/. It seems that it's possible to
> have multiple directories as the source for session .desktop files, as
> written in the kdmrc file.
> # The directories containing session type definitions in .desktop format.
> # Default is "/usr/share/apps/kdm/sessions"
> # SessionsDirs=/etc/X11/sessions,/usr/share/xsessions
> (I had to uncomment the SessionsDirs line.)
> 3. KDE 4 Home directory
> By default, any both KDE 3 and KDE 4 use the same $KDEHOME directory,
> $HOME/.kde/. I haven't been with Linux and KDE that long to have witnessed
> the other major migrations (like KDE 2 to KDE 3), so I'm not really
> familiar with how distros or KDE itself does the transition. Anyway, if
> both KDE 3 and KDE 4 share the same $KDEHOME directory, this might create
> some conflicts between two versions of the same app (like Konqueror, for
> example). It's entirely possible for the user to set the $KDEHOME directory
> on his own, but he'd have to do it per session, depending on whether he'll
> be logging into KDE 3 or KDE 4.
> Debian/Kubuntu resolves this by patching kdelibs4 to use $HOME/.kde4/ by
> default instead of $HOME/.kde/ (which is going to be used by KDE 3). I'm
> attaching the patch they use. There might be other KDE3-KDE4
> files/directories conflicts involved, but this is the only one I know of.
> Besides, since we install KDE 4 to /opt, I don't think it would be much of
> a problem.
> I'm not really sure if it's something that should be set through the kde4
> spells (since we try to ship with vanilla/defaults, right?) or just let the
> user decide. Anyway, I just thought of bringing it up for those who might
> be interested to know or for those who'll be searching in the future.
> Thanks a lot for your work on Source Mage and the KDE spells. :)
1. add yourself to group kde4
2, telinit enable kdm4
3. edit /etc/sysconfig/facilities and make kdm4 the default default
telinit switch 3
telinit switch 5
you should now get the kde4 login screen with a yellow tinge.
When you login, your $KDEHOME directory will now be .kde4, which keeps
See /etc/profile.d/kde4.sh for more details.
Konqueror, so I have disable this.
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