.git/objects/info/alternates to share the objects
with the source repository. The resulting repository
starts out without any object of its own.
++
+*NOTE*: this is a possibly dangerous operation; do *not* use
+it unless you understand what it does. If you clone your
+repository using this option, then delete branches in the
+source repository and then run linkgit:git-gc[1] using the
+'--prune' option in the source repository, it may remove
+objects which are referenced by the cloned repository.
+
+
--reference <repository>::
If the reference repository is on the local machine