Description of problem:
repos disabled in yum shell (with repo disable) are ignored when listing
available packages and when downloading and installing packages.


Version-Release number of selected component (if applicable):
yum-3.2.4-2.fc7


How reproducible:
always


Steps to Reproduce:
1. create a yum shell which disables some repos
2. add a list available or update command after the repo disable
3. run the shell
  
Actual results:
yum lists or downloads and installs packages from disabled repos


Expected results:
yum should only list or download packages from repos enabled by the
configuration and not disabled in the shell.


Additional info:

For an extreme example this command line gets the expected result:

# yum --disablerepo='*' list available
Loading "downloadonly" plugin
No Repositories Available to Set Up

However the equivalent yum shell lists all available packages from all enabled
repos:

repo disable *
list available
run

On the other hand repo list shows all repos as disabled:

repo disable *
repo list
run

With yum-3.0.6-1.fc6 (on Fedora 6) running the first shell gets the expected result:

...
Setting up Yum Shell
Setting up repositories
No Repositories Available to Set Up
...