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Date: Wed, 26 Nov 2003 19:51:34 +0100 (CET)
From: Andreas Ericsson <exon@....se>
To: owl-users@...ts.openwall.com
Subject: Re: Bug in Postfix remove script
Ah. I see things clearar now. ;)
/Andreas (too tired, too hungry, and still at work)
On Wed, 26 Nov 2003, Solar Designer wrote:
> On Wed, Nov 26, 2003 at 07:27:21PM +0100, Andreas Ericsson wrote:
> > > On Wed, Nov 26, 2003 at 05:44:15PM +0100, Andreas Ericsson wrote:
> > > > > - rmdir /var/spool/postfix/[^m]*
> > > > > + rmdir /var/spool/postfix/[^m]* || true
> > >
> > > > This will cause rpm to happily move on no matter what the error, which
> > > > isn't the intended behaviour.
> > >
> > > Actually it is.
> >
> > Then what's the point of having rpm break on errors?
>
> It depends. In %prep, %build, and %install scripts, we don't want a
> broken package to get built. In %pre, we don't want to install a
> package if we can't do the preparations. However, when it comes to
> %post, %preun, and especially %postun, we most often want to continue
> on errors (this does not imply we ignore them: we may choose to act
> differently or at least to let an error message get displayed).
>
> > > The purpose of this rmdir is to remove directories which are empty,
> > > but leave around those which aren't such that you don't lose your
> > > queued e-mail messages just because you happened to (temporarily?)
> > > uninstall Postfix.
> >
> > And with the fix,
>
> I'm not sure which fix you're referring to here.
>
> > everything but the 'maildrop' directory
>
> This one is a part of the package and will be removed by RPM itself,
> this is why we don't to remove it manually.
>
> (Actually, the entire Postfix package will change as we update to
> 2.0.x and things will be done differently.)
>
> > and any directory the user hasn't got access to
>
> I'm not sure what you mean here.
>
> > will be removed.
> > Isn't that the general idea? (I'm trying to learn something here)
>
> I think I've explained it already: all directories which don't hold
> queued messages are to be removed on uninstall. Those which do are
> left around in case of re-install or for manual removal, -- the admin
> has to make that decision explicitly and the "rmdir" will report any
> such non-empty directory such that the admin will get notified.
>
> > > If you install Postfix but don't use it and just uninstall, then
> > > everything gets removed cleanly.
> >
> > With exception of the rare times when installation halts before or
> > during %post due to some error or the user pressing Ctrl-C because
> > they don't want postfix.
>
> Correct, -- and in that case a harmless error message on uninstall is
> quite normal. In fact, RPM itself can complain too.
>
> --
> Alexander Peslyak <solar@...nwall.com>
> GPG key ID: B35D3598 fp: 6429 0D7E F130 C13E C929 6447 73C3 A290 B35D 3598
> http://www.openwall.com - bringing security into open computing environments
>
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