Recently the branch naming scheme of Fedora / EPEL packages has changed. Details about the change can be found on the Dist_Git_Branch_Proposal page. This landing page exists to provide users with information they need regarding the change.
What Changed?
Branch names of package repositories in the Fedora Project's git server.
How have they changed?
This change has removed the /master suffix from our "top level" branches. For example, the top level f15/master has become just f15.
Topic Branches
If a repository has topic branches that build upon the legacy top level branch name, such as f15/rebase these will be renamed as well, however in this case the / char will be translated to a - resulting in f15-rebase.
What do I need to do?
An updated fedpkg has been produced that will help you make use of the new branch names. First make sure you have the newest version of fedora-packager installed. After the conversion, fedpkg will detect local clones that make use of the old naming style and stop you from attempting to use them. It will direct you to use the fedpkg-fixbranches.py script to update your clone for the new naming scheme.
This script will prune local data about your repo, fetch new data, rename local branches, and update repo configuration for branch tracking. Once it finishes you will be able to work normally.
Who do I talk to if I need help?
Fedora systems administrators can assist you via #fedora-admin should you run into any trouble.