Fedora Ruby packaging Tools (ferut) is set of tools to help with packagin of Ruby on Fedora. These tools are very utilitarian and there is no guarantee they will work for you.
Prepare development snapshot using mock tool and adjust a few bits in the ruby.spec file, such as revision and versions of bundled packages.
Fix Ruby patches to apply cleanly.
Renames specified patch in a way git format-patch would do, extracting
required information from Subject: line.
The whole idea was discussed here and Git might provide some better plumbing for this tool.