configuration variables are created.
--mirror::
- Set up a mirror of the remote repository. This implies `--bare`.
+ Set up a mirror of the source repository. This implies `--bare`.
+ Compared to `--bare`, `--mirror` not only maps local branches of the
+ source to local branches of the target, it maps all refs (including
+ remote branches, notes etc.) and sets up a refspec configuration such
+ that all these refs are overwritten by a `git remote update` in the
+ target repository.
--origin <name>::
-o <name>::