Description of problem: buildinstall always downloads all packages needed for the install root.  When pungi creates install DVD for Fedora 11, then that is about 350MB, which takes non-ignorable time.  Instead, buildinstall should use a caching mechanism for packages that are required by the install root.  Perhaps the caching could coordinate with the pungi caching (/var/cache/pungi/rawhide/packages, etc.)


Version-Release number of selected component (if applicable):
anaconda-11.5.0.33-1.i586


How reproducible: always


Steps to Reproduce:
1.Compose an install DVD using recipe on manual page for pungi: pungi -c /usr/share/pungi/rawhide-fedora.ks --destdir=... --name myDVD --ver 11
2.Observe network traffic when pungi sub-invokes /usr/lib/anaconda-runtime/buildinstall
3.
  
Actual results: All packages necessary to construct the install root are downloaded by buildinstall, even though many of them are present already in /var/cache/pungi/rawhide/packages, and even though many of them are the same as in previous attempts.


Expected results: buildinstall uses an effective caching mechanism for packages that are required to build the install root.


Additional info:  This may be related to bug 481445 "revisor does not use yum proxy".