fast repo updates

[seth vidal]

On Fri, 2006-05-26 at 07:47 -0500, Rex Dieter wrote:
> Mike McLean wrote:
> 
> 
> > This patch allows createrepo to recycle existing metadata so that it
> > only has to scan the rpms that have been changed or added. 
> 
> How is this different than the existing --cachedir option?

It looks like it reads in the old metadata, using its own parser to help
chop them up.

The only part I'm confused by is why it has its own parser to do this.

-sv