Seth Vidal wrote:
> the downgrade problems are as follows:
>
> 1. scriptlets are not reversible
> 2. downgrading works provided the user data/user config is not modified by
> an update in a one-way process. (ex: mysql upgrade from 4->5 will convert
> a db, but going back the other way won't fly)
> 3. There are certain processes which no one is ever going to do the work
> to make them reversible: lvm1->lvm2, db transitions, udev migration,
> ext3->ext4.
4. Some KDE applications use kconf_update to upgrade configuration files to
a new syntax. This works per user, the first time the KDE libraries are
used by that user after the upgrade. Other applications may have similar
per-user config file upgrade mechanisms. This is also not easily
reversible.
Kevin Kofler
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