Description of problem:
doing an install on a system that already has disks partitioned and choosing to
use the existing disks leads to partitioning configuration in ks.cfg which
doesn't reproduce the install.

Version-Release number of selected component (if applicable):
pykickstart-0.43-1.el5
anaconda-11.1.2.105-1


How reproducible:
always

Steps to Reproduce: (using xen for example)
1. Install the system choosing default partitioning
2. Make a note on partitions used
3. After install reboot and start a second install
4. Chose customized disk layout and assign mountpoints/fs type for the existing
partitions.
5. Finish the install and grab the resulting anaconda-ks.cfg 

Actual results:
generated ks.cfg will not reproduce the install

Expected results:
generated ks.cfg will reproduce the install


Additional info:
kistart configuration from Xen guest with one disk 4GB

initial install (autopart)
---------------------------------------------------------------------
clearpart --all --drives=xvda
part /boot --fstype ext3 --size=100 --ondisk=xvda
part pv.2 --size=0 --grow --ondisk=xvda
volgroup VolGroup00 --pesize=32768 pv.2
logvol swap --fstype swap --name=LogVol01 --vgname=VolGroup00 --size=528 --grow
--maxsize=1056
logvol / --fstype ext3 --name=LogVol00 --vgname=VolGroup00 --size=1024 --grow
---------------------------------------------------------------------

second install
---------------------------------------------------------------------
clearpart --linux
part /boot --fstype ext3 --onpart xvda1
part pv.2 --noformat --onpart xvda2
volgroup VolGroup00 --noformat --useexisting --pesize=32768 pv.2
logvol swap --useexisting --fstype swap --name=LogVol01 --vgname=VolGroup00
--size=1056
logvol / --useexisting --fstype ext3 --name=LogVol00 --vgname=VolGroup00 --size=2816
---------------------------------------------------------------------

note the --onpart options which are just fine. However the clearpart line
removes all partitions so in the next step they can't be found. I get an error
dialog saying that partition xvda1 can't be found.

If you remove the clearpart line it's ok.