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Re: postrm::downgrade?

On Wed, Jul 02, 2003 at 03:18:36PM +0800, Niall Young wrote:
> I'm aware you can downgrade packages with
>     `apt-get --force-yes install package=version-revision`
> but this doesn't seem to apply any postrm processing on the existing
> version of the package being replaced.
> How about a postrm::downgrade hook to reverse any changes made in the
> new version's preinst::upgrade so that when the old version's preinst::upgrade
> is applied you're not left with a potential mix of configuration?
> I'm using a custom package pool for deploying software, but we need to
> cleanly rollback if an upgrade doesn't go as expected.  Removing the
> package entirely and reinstalling isn't an option, it needs to be done
> seamlessly - i.e. reverse all changes made in the upgrade.  Is there
> another way?

I should point out that there are a number of changes which _cannot_
be rolled back. Upgrading a libdb database to a new format version is
a good example.

  .''`.  ** Debian GNU/Linux ** | Andrew Suffield
 : :' :  http://www.debian.org/ | Dept. of Computing,
 `. `'                          | Imperial College,
   `-             -><-          | London, UK

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