repo is a project developed by google to help their devs with developing the Android OS. https://code.google.com/p/git-repo/
I thought repo might be a good way for libretro devs to keep all the code from all the various libretro projects up to date on their machines. I’ve set up a manifest.xml file that manages this here: https://github.com/libretro/libretro-manifest The README.md there goes over basic usage and explains how you can configure repo it to pull the code for a single libretro core you might be developing from your own personal repository.
using the repo tool is a replacement for running for running libretro-fetch.sh it results in the exact same file structure on your machine while offering a few key advantages as described in the README.md