Description of problem:
RHEL5.1 Virtualisation host, when installing a Fedora 8 para-virt guest fails
with a traceback, even though the install tree URL is correct.

Version-Release number of selected component (if applicable):
python-virtinst-0.103.0

How reproducible:
100%

Steps to Reproduce:
Install RHEL5 update 1 , add Virtualisation Platform and boot to the dom0
kernel.Using the Virtualisation Manager GUII tool, begin a new guest
installation. Select 'Parra Virtualised, and entre a valid installation tree
URL, ie :

http://mirror.pacific.net.au/linux/fedora/linux/releases/8/Fedora/ x86_64/os/
  
Actual results:
A trace back error appears:

Unable to complete install: 'Could not find an installable distribution the
install location'

Unable to complete install 'exceptions.RuntimeError Could not find an
installable distribution the install location
Traceback (most recent call last):
 File "/usr/share/virt-manager/virtManager/create.py", line 681, in do_install
   dom = guest.start_install(False, meter = meter)
 File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 647, in
start_install
   tmpfiles = self._prepare_install_location(meter)
 File "/usr/lib/python2.4/site-packages/virtinst/ParaVirtGuest.py", line 65, in
_prepare_install_location
   (kernelfn,initrdfn,args) = DistroManager.acquireKernel(self.location, meter,
scratchdir=self.scratchdir, type=self.type)
 File "/usr/lib/python2.4/site-packages/virtinst/DistroManager.py", line 573, in
acquireKernel
   progresscb=progresscb, distro=distro, scratchdir=scratchdir)
 File "/usr/lib/python2.4/site-packages/virtinst/DistroManager.py", line 562, in
_storeForDistro
   raise RuntimeError, "Could not find an installable distribution the install
location"
RuntimeError: Could not find an installable distribution the install location

Expected results:
Fedora 8 parra-virtualised installation should be possible.

Additional info:
Simple change to the /usr/lib/python2.4/site-packages/virtinst/DistroManager.py
file that is already in Fedora 8's python-virtinst RPM fixes the problem. At
line about 205 add code to look for the fedora.css file:

...,
# Fedora distro check
class FedoraImageStore(RedHatImageStore):
   def isValidStore(self, fetcher, progresscb):
       if fetcher.hasFile("fedora.css", progresscb):
           logging.debug("Detected a Fedora distro")
           return True
       if fetcher.hasFile("Fedora", progresscb):
           logging.debug("Detected a Fedora distro")
           return True
       return False