Recursing on repos

Hi all,
I would like to do something simple...

I would like a script that:
 disable all repos
 recurse on every repos and enable one repo at once
  retrieve a list from the enabled repo
  disable the repo
  go to the next repo and do the same things.

I coded this, but it do not work

import yum, os, sys
yb = yum.YumBase()
yb.conf.cache = os.geteuid() != 1

for repo in sorted(yb.repos.disableRepo('*')):
 print "----", repo
 yb.repos.enableRepo(repo)
 for enabrepo in yb.repos.listEnabled():
  print "Abilitato ",enabrepo,"\n"
 pkgs = yb.pkgSack.returnPackages()
 for pkg in pkgs:
  print pkg.name, pkg.ver, pkg.rel, pkg.arch, pkg.repo
 yb.repos.disableRepo(repo)
 print "repo disabilitato", repo

I have two kinds of errors.
 first... 
  in every package I receive the same package from the first repo

 second...
  if I remove the sorted in the first for, I receive the error:

Traceback (most recent call last):
  File "yumlist.py", line 10, in <module>
    pkgs = yb.pkgSack.returnPackages()
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 592, in
<lambda>
    pkgSack = property(fget=lambda self: self._getSacks(),
  File "/usr/lib/python2.5/site-packages/yum/__init__.py", line 435, in
_getSacks
    self.repos.populateSack(which=repos)
  File "/usr/lib/python2.5/site-packages/yum/repos.py", line 251, in
populateSack
    sack.populate(repo, mdtype, callback, cacheonly)
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 162, in
populate
    if self._check_db_version(repo, mydbtype):
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 223, in
_check_db_version
    return repo._check_db_version(mdtype)
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 1147, in
_check_db_version
    repoXML = self.repoXML
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 1305, in
<lambda>
    repoXML = property(fget=lambda self: self._getRepoXML(),
  File "/usr/lib/python2.5/site-packages/yum/yumRepo.py", line 1301, in
_getRepoXML
    raise Errors.RepoError, msg
yum.Errors.RepoError: Cannot retrieve repository metadata (repomd.xml)
for repository: kwizart-rawhide-debuginfo. Please verify its path and
try again

I can't understand how to make the pkgs consistent with the repo enabled

Tnx

-- 
Ciao
        Pirla

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