preupgrade F10

Will Woods wwoods at
Sat Mar 21 17:43:49 UTC 2009

On Fri, 2009-03-20 at 18:50 -0400, Gerry Reno wrote:
> Jesse Keating wrote: 
> > On Fri, 2009-03-20 at 14:48 -0400, Gerry Reno wrote:
> >   
> > > My perspective is from the user point of view.   If the user is 
> > > upgrading to a new release let's say and the process goes along for 
> > > quite a while and then decides to bomb out because the rpm version 
> > > needed to be newer then the user becomes confused.  The software should 
> > > take care of this.  So if any package in the whole update requires a 
> > > newer yum/rpm then I think yum should go do that first.
> > >     
> > 
> > Upgrading to a new release is precisely when this will fail.  The "new
> > yum" and "new rpm" would require all the other new packages in order to
> > be functional.  There is no way to use the new yum without the rest of
> > the new stuff.
> > 
> >   
> This then says to me that packagers ought to be completely static and
> not dependent on anything, so that we can actually perform an upgrade
> on them first and then upgrade everything else.   Or alternatively, we
> load a static version to complete the upgrade and then update to the
> shared version.
> To require that the user remember to perform certain preupgrade
> procedures is just asking for lots of user frustration.  Even if you
> put it in bold geezer font you will always have users who just forget,
> or get confused and don't do it.

You're getting confused. These tricks are only required if you're going
to try to run a 'yum upgrade' on a running system to upgrade between
major releases. It's complex, hard to document, error-prone, and doesn't
handle a lot of the special cases that anaconda does.

Running preupgrade requires *none* of these special preparations. It
downloads install images and *only* the packages you need, and then it
boots into the installer. The installer already *has* the newer
kernel/yum/rpm/etc. You don't need to worry about any of these things
with preupgrade.

> The better way is to create software that takes care of these things
> and gives the user a better experience.

We did. It's preupgrade. Give it a try!


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