error on trying to upgrade really old darwinports install

[Frank Even]

Is there a method for upgrading an old darwinports install that was
installed on a MacBookPro that has been upgraded from 10.4 to 10.5?

I'm trying to run the selfupdate, it fails.  I've found some
references to changing "darwinports" in the rsync commands to
"macports," I've done that, but I'm failing with the same error
basically.

bash-3.2# port version
Version: 1.320

Here are the results of a failed "port -vd selfupdate"

DEBUG: couldn't open
"/opt/local/var/db/dports/sources/rsync.rsync.macports.org_dpupdate1/base/config/dp_version":
no such file or directory
    while executing
"open [file join $dp_base_path config/dp_version] r"
    (procedure "darwinports::selfupdate" line 45)
    invoked from within
"darwinports::selfupdate [array get global_options]"
Error: /opt/local/bin/port: selfupdate failed: couldn't open
"/opt/local/var/db/dports/sources/rsync.rsync.macports.org_dpupdate1/base/config/dp_version":
no such file or directory


I'd prefer not to have to blow it away and start from scratch, but if
needed, I can.  If so, then I would ask what is the best/standard
method for cleaning up the ports and installing a fresh "MacPorts?"

Thanks,
Frank