Bug 150352

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Description of problem:
In setting up an nfs root tree for a diskless cluster (warewulf) I use
yum --installroot to specify the nfsroot path to which yum needs to
install the system. It was found that yum.repos.d/ did not exist in my
nfsroot path so yum searched the normal /etc/yum.repos.d/ path and
found the repo configuration for the server. By creating the
yum.repos.d dir in the installroot path yum no longer searched the
normal path. So with no yum.repos.d path created yum is not properly
processing the --installroot option.

Version-Release number of selected component (if applicable):
yum-2.1.12-0.fc3

How reproducible:
Always

Steps to Reproduce:
1. create a basic root tree:
mkdir -p /vnfs/dev/
mkdir -p /vnfs/etc/warewulf/
mkdir -p /vnfs/etc/warewulf/
mkdir -p /vnfs/var/lib/rpm
rpm --initdb --dbpath /vnfs/var/lib/rpm

2. Create a yum.conf file in the /vnfs/etc/ dir:
cat <<EOF >/vnfs/etc/yum.conf
[main]
cachedir=/var/cache/yum
debuglevel=2
logfile=/var/log/yum.log
pkgpolicy=newest
distroverpkg=redhat-release
exactarch=1

[base]
name=Fedora Core $releasever - $basearch - Base
baseurl=http://192.168.0.8/~burnin/mirror/fedora/$releasever/$basearch/os/
enabled=1
gpgcheck=0

EOF

3. Attempt a yum install on the new root tree:

yum --installroot /vnfs SysVinit


Actual Results:  The repos in the yum.conf from the installroot path
will be setup as expected and yum will then try to setup any repos it
finds in /etc/yum.repos.d/


Expected Results:  yum should only setup repos which are found in the
specified installroot path. If there is no yum.repos.d dir in the
installroot path then it should not look further.

Additional info: