On Fedora 21+ Oh-My-Vagrant is now available as a COPR:
https://copr.fedoraproject.org/coprs/purpleidea/oh-my-vagrant/
https://ttboj.wordpress.com/2015/07/08/oh-my-vagrant-mainstream-mode-and-copr-rpms/

For CentOS/RHEL 7+ it is almost as easy to install. Please read:
https://ttboj.wordpress.com/2015/08/11/vagrant-and-oh-my-vagrant-on-rhel7/

Happy Hacking!
