I still haven't figured it out yet, but it sounds like Liraz knows how to do it. If you figure it out, please post directions. See the post at the link below.
http://www.turnkeylinux.org/forum/general/20100819/turnkey-linux-and-tklpatch
More information about text formats
XenServer-ready tar.gz filesystems to ISO Conversion Process
I still haven't figured it out yet, but it sounds like Liraz knows how to do it. If you figure it out, please post directions. See the post at the link below.
http://www.turnkeylinux.org/forum/general/20100819/turnkey-linux-and-tklpatch