Bug#501866: Missing dependancy - libpango1.0-common.prerm uses defoma-app in pkg defoma

[Josselin Mouette]

(Please don’t top-post, it’s hard to follow you.)

Le mercredi 15 octobre 2008 à 10:37 -0400, Higgins, Paul a écrit :
> I'm not sure where the problem lies.  I saw that the packages that
> couldn't find File/Copy.pm seemed to have their dependencies correct,
> but apt and dpkg still allowed perl-modules to break it.  The one
> package I checked closely because it broke the install, libtiff4,
> doesn't seem to depend on doc-base as it should.  
> 
> It seems like there must be some way to make sure the unpack, etc. for
> package perl-modules 5.10.x either leaves the 5.8.x tree alone, or
> waits until it is no longer needed to remove it.

Frankly, I’m tempted to reassign this to dpkg; Policy §7.2 is very clear
on the relationship between prerm scripts and Depends. 

It’s not the first time I’ve seen this, although it usually happens when
there is a dependency cycle: one of the dependencies of a package in the
Depends list can be in a broken state at the time of prerm running. 

Dpkg needs to ensure that all dependencies *and their own dependencies*
are in a clean, installed state when running the prerm script. It
correctly does it for postinst already.

> -----Original Message-----
> From: Josselin Mouette [mailto:joss at debian.org] 
> Sent: Monday, October 13, 2008 04:36
> To: Higgins, Paul; 501866 at bugs.debian.org
> Subject: Re: Bug#501866: Missing dependancy - libpango1.0-common.prerm uses defoma-app in pkg defoma
> 
> Le vendredi 10 octobre 2008 à 22:24 -0400, Paul Higgins a écrit :
> > The prerm  or postrm scripts for these packages use either
> > /usr/bin/defoma-app or /usr/sbin/install-docs (in packages defoma and
> > doc-base).  Those in turn reference files in perl-modules already 
> > removed, causing libtiff4 to abort the install.  In summary:
> > 
> >    fontconfig.prerm, libpango1.prerm, and libwmf0.2-7.postrm
> >    all invoke /usr/bin/defoma-app; which needs File/Copy.pm
> >    from perl-modules.  It was able to continue using the prerm
> >    script from the new package.
> > 
> >    libpng12-0.prerm, libtiff4.prerm, base-passwd.postinst,
> >    cupsys.prerm, and shared-mime-info.prerm invoke
> >    /usr/sbin/install-docs which needs Pod/Usage.pm from perl-modules.
> 
> What exactly are we supposed to change in those packages? They either
> correctly depend on defoma (for defoma-app) or check that install-docs
> is here before launching it.

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