[CentOS] differences between yum update and yum check-update

[Johnny Hughes]

On Sun, 2006-05-07 at 22:53 +0200, Kai Schaetzl wrote:
> Johnny Hughes wrote on Sun, 07 May 2006 10:49:42 -0500:
> 
> > Assuming what I found to be true ... this is not a bug with yum or 
> > protectbase ... or even I problem with the repos individually ... but a 
> > problem if dag and kbs are used together.   
> 
> It is a problem whenever a package obsoletes another package and that or 
> it's name is in other repos as well.
> 
> > ------------------------------------ 
> > If you want to use Dags repo for clamav: 
> >  
> > in the kbs-CentOS-Extras repo add this line: 
> >  
> > exclude=clamav* 
> 
> Sure, I can do this, but I have to do this without protectbase, anyway.
> 
> > As a side note, this kind of problem happens quite frequently when more 
> > than one repo is used.
> 
> But the whole point of protectbase is that it *protects*, isn't it? I mean 
> in my eyes "protect" means "protect" against replacement by another repo 
> by whatever means. I don't care if it updates, obsoletes or whatever. Why 
> should "obsoletes" be handled different?

Because ... that is a second set of calculations 

In the first set of calculations, all the packages where the names match
up are done .. hmmm, a new package named clamav-db is needed (and there
is nothing protected to prevent that).  In a second set of
calculations ... clamav-db obsoletes something else.

If you try to install it doesn't do it ... NOW ... if the names were the
same (with or without the obsoletes) this would not happen.
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