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Description of problem:
There's one corner case issue remaining with -C:

$ mkdir test
$ cd test
$ mkdir packages
$ createrepo -v -C .
repo is up to date
$ createrepo .

Saving Primary metadata
Saving file lists metadata
Saving other metadata
Generating sqlite DBs
Sqlite DBs complete
$ rpm -V createrepo
$ rpm -q createrepo
createrepo-0.9.9-15.el6.noarch
$

This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.

commit f0020c470935cbb98ed4c53ef8ae24952e799a01
Author: Zdeněk Pavlas <zpavlas>
Date:   Fri Dec 14 11:20:21 2012 +0100

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0879.html