.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 using the
+ '--prune' option in the source repository, it may remove
+ objects which are referenced by the cloned repository.
If the reference repository is on the local machine