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Date: Tue, 16 Sep 2003 18:05:07 -0400 (EDT)
From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To: cygwin AT cygwin DOT com
To: Rolf Campbell <Endlisnis AT mailc DOT net>
cc: cygwin AT cygwin DOT com
Subject: Re: Setup installation order?
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On Tue, 16 Sep 2003, Rolf Campbell wrote:

> Igor Pechtchanski wrote:
>
> > On Tue, 16 Sep 2003, Rick Rankin wrote:
> >>I ran into a situation I hadn't seen before a few days ago when I used
> >>setup to update my Cygwin installation from 1.5.3 to 1.5.4. What
> >>happened was that there were several packages, in addition to
> >>cygwin-1.5.4, that had updates available. Setup downloaded the updates,
> >>then uninstalled the old packages, including cygwin-1.5.3. When it went
> >>to install the updates, cygwin-1.5.4 was *not* the first package that
> >>got installed, so any postinstallion scripts failed with a dialog box
> >>from the O/S saying that "Windows cannot find cygwin1.dll in <path
> >>list>" until after cygwin itself was updated. After setup installed the
> >>cygwin package, the rest of the postinstall scripts ran fine.
> >>
> >>Is the cygwin package given any special consideration during the install
> >>process (e.g., last to be uninstalled, first to be (re)installed), or is
> >>this something that's expected to be handled by the dependency list?
> >>I've been perusing the setup sources, but I haven't quite figured out
> >>the dependency processing, yet. So far, I haven't found anything related
> >>via Google searches, either.
> >>
> >>--Rick
> >
> >
> > The setup program simply performs a topological sort of the package
> > dependence graph, and then traverses the packages in that order.  Of
> > course, since the graph is cyclic, topological order is not unique.  In
> > any case, the postinstall scripts should run after *all* the packages are
> > unpacked, so you shouldn't be missing cygwin1.dll on postinstall.
> >
> > However, preremove scripts are run just before the corresponding package
> > is removed (in alphabetical order, IIRC).  This presents a problem, but
> > noone so far has considered it a large enough problem to invest the effort
> > in a fix.  It's likely that you saw this particular problem in your
> > upgrade.  <http://cygwin.com/acronyms/#PTC>.
> >       Igor
>
> Wouldn't it make sence to call each preremove script before any packages
> are actually removed?

It would make sense.  It's currently not done that way.  PTC.
	Igor
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