--dbpath DIRECTORY
              Use  the  database  in  DIRECTORY  rather  than the default path
              /var/lib/rpm
 
       --root DIRECTORY
              Use the file system tree rooted at DIRECTORY for all operations.
              Note  that this means the database within DIRECTORY will be used
              for dependency checks  and  any  scriptlet(s)  (e.g.   %post  if
              installing, or %prep if building, a package) will be run after a
              chroot(2) to DIRECTORY.