F8T3 yum update failures

[Michael Schwendt]

On Thu, 18 Oct 2007 13:05:36 -0700, Rick Stevens wrote:

> On Thu, 2007-10-18 at 21:59 +0200, Michael Schwendt wrote:
> > On Thu, 18 Oct 2007 12:37:40 -0700, Rick Stevens wrote:
> > 
> > > Sorry, I just joined the list.  While I did scan the archives, I didn't
> > > see any resolution to F8T3 yum update failures...specifically the one
> > > where kdegraphics and kdebase depend on libIlmImf.so.4.
> > > 
> > > That file exists in both /usr/lib and /usr/lib64 on my system (Opteron)
> > > and I've done a forced update (rpm -Fvh --force --nodeps) for those two
> > > packages yet yum still won't complete the update.
> > > 
> > > Any ideas?
> > 
> > The "fix" you tried is completely incorrect. People around the world
> > propose such "forced updates" again and again, and it seems impossible
> > to stop them from doing so. :( So, takes this advice: Look at *all*
> > packages in the update transaction set, not just the packages that are
> > installed already. Yum complains about files that will be missing
> > *after* applying the updates. An updated package takes away the needed
> > library. It doesn't matter that the library, which is complained
> > about, is installed already. A new package replaces the file with a
> > newer library that is incompatible with other packages. In your case
> > it is the newer OpenEXR-libs package which is ABI-incompatible. Wait
> > for the rebuilds [of the KDE packages] to show up in your favourite
> > mirror of Fedora Development (aka rawhide).
> 
> I'm aware of the dangers of a forced update, so that's not a problem.
> This is also an experimental hamster machine and a full reinstall is
> also no big deal should it be necessary.
> 
> However, it is strange that yum would whine that a library that is
> already installed isn't available, and that kdebase and kdegraphics
> have this weird dependency when it is caused by OpenEXR-libs.
> 
> But then again, yum has some peculiarities.

No. It looks like my comment above is too difficult to understand in
its quickly-typed-in form.

You simply misinterpret Yum's error message. 

Interpret it differently (i.e. correctly).

Yum reports that "_after_ installing the updates, the needed libraries
would be missing".

Once more, it does not matter that you have the library installed
already. An update package removes it, since it replaces it with the
incompatible version that breaks the requirements of the installed
packages.

[To understand Yum's perspective, do "rpm -ql OpenEXR-libs" and
repeat that for the _new_ OpenEXR-libs package that is offered
as an update.]