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Old 10-15-2008, 03:20 PM
Josselin Mouette
Default Bug#501866: Missing dependancy - libpango1.0-common.prerm uses defoma-app in pkg defoma

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

Le mercredi 15 octobre 2008 * 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@debian.org]
> Sent: Monday, October 13, 2008 04:36
> To: Higgins, Paul; 501866@bugs.debian.org
> Subject: Re: Bug#501866: Missing dependancy - libpango1.0-common.prerm uses defoma-app in pkg defoma
> Le vendredi 10 octobre 2008 * 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.

: :' : We are debian.org. Lower your prices, surrender your code.
`. `' We will add your hardware and software distinctiveness to
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