pkgdb.db: unexpected file type or format

[Jeffrey Goldberg]

Yesterday I moved from 6.2-RELENG to 7-RELENG and everything worked  
fine (though I do have a few questions about mergemaster that I'll ask  
later).

As suggested on this list, I started to rebuild all of my ports.

I started  with

   portupgrade -f '<2007-11-01 12:00'

and all seemed to go well until I realized that I should have added "-- 
batch" to that.  So I interrupted the process and restarted with


   portupgrade -f --batch '<2007-11-01 12:00'

This has been running apparently just fine overnight, but then I  
noticed that after building each port, they didn't get installed  
because I was getting an error like

  /var/db/pkg/pkgdb.db: unexpected file type or format -- Invalid  
argument

So I stopped things again and tried to fix pkgdb.db

$ sudo pkgdb -v -F
--->  Checking the package registry database
/var/db/pkg/pkgdb.db: unexpected file type or format -- Invalid argument
$ sudo file /var/db/pkg/pkgdb.db
/var/db/pkg/pkgdb.db: Berkeley DB 1.85 (Hash, version 2, native byte- 
order)

What should I do now.  I suppose that my problem was with interrupting  
the portupgrade the first time 'round.  But is there anything I can do  
to fix this.

-j