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
+ remote-tracking 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.