(sorry, in a hurry, this will be a very succint report)

[root@localhost ~]# sh test.sh
+ tree=http://download.fedoraproject.org/pub/fedora/linux/releases/15/Everything/x86_64/os
+ virt-install --connect=qemu:///system --network=bridge:br0 --initrd-inject=/export/fed-minimal.ks '--extra-args=ks=file:/fed-minimal.ks       console=tty0 console=ttyS0,115200' --name=f15testbox --disk /var/lib/libvirt/images/f15testbox.img,size=20 --ram 2048 --vcpus=2 --check-cpu --accelerate --hvm --location=http://download.fedoraproject.org/pub/fedora/linux/releases/15/Everything/x86_64/os --nographics
Traceback (most recent call last):
  File "/usr/sbin/virt-install", line 36, in <module>
    import virtinst
  File "/usr/lib/python2.7/site-packages/virtinst/__init__.py", line 32, in <module>
    from Guest import Guest, XenGuest
  File "/usr/lib/python2.7/site-packages/virtinst/Guest.py", line 40, in <module>
    import DistroInstaller
  File "/usr/lib/python2.7/site-packages/virtinst/DistroInstaller.py", line 31, in <module>
    import OSDistro
  File "/usr/lib/python2.7/site-packages/virtinst/OSDistro.py", line 1019
    versionfile = fetcher.acquireFile("VERSION", progresscb)
                                                           ^
TabError: inconsistent use of tabs and spaces in indentation