repoman is a [portage](http://en.wikipedia.org/wiki/Portage_(software) tool to check an overlay for best practice and deprecation.
It's used on aegypius overlay to run tests on travis-ci
It should work with most of continuous integration platforms that can run docker containers.
- /overlay
docker pull aegypius/repoman
docker run -v /path/to/overlay:/overlay aegypius/repoman
You can found more information by running
docker run -it aegypius/repoman repoman --help