Eclipse uses GitHub as a source of mirrors.
GitHub populates the mirrors from a script that generates a list of repositories from project metadata:
The script is run manually on a periodic basis. We nudge GitHub every once-in-a-while to run the script and update the mirrors.
The script uses the project metadata as specified in the Developer Portal. The implementation is quite robust; you can specify your project's Git repositories (one per line) in any of the following formats:
- git://egit.eclipse.org/* (EGit project only)
(Note that you'll have to replace the wildcards above with absolute values for each of your project's repositories; do not include wildcard characters in the values you specify).
The script (and other uses of this information at eclipse.org) will normalize the value you provide into an appropriate value.