cd-rom iso image with /etc/apt/sources.list, local repository

["Russell L. Harris" <rlharris@oplink.net>]

Is it possible to configure /etc/apt/sources.list to read a CD-ROM or 
DVD ISO image in place of a physical CD-ROM?  I am thinking in terms of 
mounting the ISO image with the "loop" option of mount, as I do when 
using jigdo-lite to update the image.

Actually, instead of updating a dozen or more CD-ROM images, I switched 
over to DVD images, inasmuch as there are only three.  I do not plan to 
burn DVDs, but this does provide me a local copy of the Debian i386 
"testing" repository with little effort.

I would prefer to switch from DVD images to a Debian i386 "testing" 
repository within the LAN.  Can a local repository be updated as easily 
as CD-ROM and DVD images can be updated with jidgo-lite?  Is there a 
simple HOWTO for a single-architecture, single-distribution local 
repository?

RLH