Bug#410695: zope2.7 causqe upgrade failure

[Daniel Burrows <dburrows@debian.org>]

On Thu, Mar 08, 2007 at 09:59:45PM -0800, Steve Langasek <vorlon@debian.org> was heard to say:
> Hi Daniel,
> 
> On Thu, Mar 08, 2007 at 08:32:04AM -0800, Daniel Burrows wrote:
> > > > In all cases it seems unlikely to affect aptitude. If it is capable to
> > > > handle dependencies for prerm's in the circular loop case, it is most
> > > > probably capable to do the same in simpler cases like this one.
> 
> > > I don't know if it's true that aptitude does this, or if some other
> > > difference between apt-get and aptitude means that aptitude tends to be
> > > "luckier".
> 
> >   While I'm not opposed to people having warm happy fuzzy feelings about
> > aptitude, I know of no fundamental reason that it should be immune to
> > this problem.  The issue (as far as I understand it) is the way in which
> > dpkg is invoked, which aptitude completely punts to apt.
> 
> Thanks for the input.
> 
> Do aptitude and apt pass the same number of packages to dpkg at a time?
> Could that be a difference here?  (That was the sort of difference I was
> thinking of in terms of aptitude getting "lucky".)

  Essentially the way it works is: aptitude creates a "fetcher" object,
fills it with the current set of selected packages, then tells it to go
download and install them.  apt-get does the same thing.  TBH, I don't
see why aptitude should work here where apt-get doesn't, unless they
actually install different sets of packages.

  Daniel