Re: Bug#148336: apt: problem solver wants to remove frozen-bubble

[Goswin Brederlow <goswin.brederlow@student.uni-tuebingen.de>]

Jason Gunthorpe <jgg@debian.org> writes:

> On Tue, 28 May 2002, Goswin Brederlow wrote: 
> 
> > Since frozen-bubble stands higher in the hirachy of dependencies (it
> > depends on frozen-bubble-lib) apt-get should keep it and resolve its
> > new dependencies, even though that means removing an old and
> > installing a new deb instead of just removing one.
> 
> Er no, that isn't always true.
> 
> I think this is probably just one of those cases that can't be reasonably
> handled automatically.
> 
> Jason

Package: frozen-bubble
Replaces: frozen-bubble-lib
Conflicts: frozen-bubble-lib
Depends: frozen-bubble-data (= 0.9.3-2)

Package: frozen-bubble-lib
Recommends: frozen-bubble

Package: frozen-bubble-data
Recommends: frozen-bubble

The problem solver should not change the installation during upgrade,
not more than neccessary. In this case upgrading frozen-bubble is
clearly the only choice it has:

remove frozen-bubble:
- If it removes frozen-bubble it reduces the system. It will break
  stuff. This should be a big negative score.

install frozen-bubble:
- If it replaces the frozen-bubble-lib with the frozen-bubble nothing
  is changed (since frozen-bubble replaces frozen-bubble-lib). No
  change, no score (or very little)

- If it installs frozen-bubble-data it enlarges the system. Nothing
  old is changed, just some new stuff. It shoudn't fo that, but its
  not so bad. Only a minor negative score applies here.


Overall installing frozen-bubble is by far the lesser evil. How does
the problem solver ever come up with puring frozen-bubble in such a
simple case?


MfG
        Goswin


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