Why are there only sometimes images in rawhide?

[Bruno Wolff III]

On Mon, Feb 11, 2008 at 17:00:55 -0500,
  Jesse Keating <jkeating at redhat.com> wrote:
> On Mon, 11 Feb 2008 14:25:43 -0600
> 
> Attempts to make the images are done every night.  Often times things
> conspire to make this attempt fail.  In particular, last night
> system-config-firewall had a bad Requires on usermode, and thus the
> chroots couldn't successfully install anaconda and it's deps in order
> to make the images.

OK, thank makes sense. The next time they show up, I think I'll make a
separate copy of the images. Otherwise when I resync my local copy they go
away, which means falling back to the alpha rescue iso, which may not have
some fixes in it.