Updating an iso image

[Bruno Wolff III]

On Mon, Jan 17, 2011 at 11:48:22 -0700,
  joojee <joojee at gmail.com> wrote:
> I'd like to automate the process of keeping an iso image current with
> updates that are released.  I googled a bit and didn't see anything, but
> does anyone know if there's anything that exists that rsyncs (or whatever)
> the updated packages from an update mirror, determines if there's an
> existing older version of that package in Packages/ and removes that older
> package?

You might want to keep local mirrors and just do periodic rebuilds. Updates
happen often enough, that if current means say within a week, you should
probably just do weekly rebuilds. When you down to a timescale of about a
day, it might be worth checking if updates actually affect your spin before
doing the rebuild.