In order to fully support filesystem encryption in anaconda for 5.3, we also need to backport the pykickstart chunks from rawhide.
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Created attachment 310812 [details] support block device encryption
Dave committed this yesterday, and it should be fixed in the next build of pykickstart.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2009-0221.html