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Re: how to undo an upgrade

On Thu, Nov 30, 2000 at 12:02:52PM +0100, Wichert Akkerman wrote:
> Subject: Re: how to undo an upgrade
> Previously Richard Higson wrote:
> > if invoked-with-option-to-revoke-later-if-Im-not-happy && exists /usr/bin/blah
> >    copy   /usr/bin/blah /somewhere/safe/usr/bin/blah1
> >    untar /from/packaged-v2-blah to /usr/bin/blah
> >    twiddle with status-files
> >    announce success
> > fi
> I hope for people using that feature that this pseudocode is
> incorrect, it doesn't check dependencies on downgrade at all.
It was off the cuff, and very superficial, basically to say that they're not doing
heavy magic for the "revoke/accept" stuff.

The AIX install mechanism is very strong as far as dependancies (pre-requisites) are
concerned, and they go to a lot of trouble to assure that all PFT's 
(program-temporary-fixes) and so on have been applied, and that no "conflicts" 
are raised by a proposed change.

You could find an introduction to the .lpp packages at

Here's a list of "freeware" packages for AIX - take one you know on debian, 
pull it apart and see how it works.

If you download "bull.mklpp-" and "unzip" it, 
it will show you how to prepare .lpp packages, and interact with the AIX
"repository" (like our /var/lib/dpkg/*).

   You don't have to be faster than the Bear that's chasing you.
   You merely need to be faster than the others running with you.
   ... from "Maintaining System Security" ...
Have a nice day ;-) Richard Higson mailto:Richard.Higson@gt.owl.de

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