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From:	Rolf Campbell <Endlisnis AT mailc DOT net>
Subject:	Re: Setup installation order?
Date:	Tue, 16 Sep 2003 17:22:39 -0400
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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?



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