Copy changesets from a remote repository instance to a local one.

The pull operation is also used for synchronization between two repository instances. Specifically, this operation happens from the perspective of a local repository instance that wants to copy some changesets from a remote repository instance. Usually, the remote instance is the one from which the local instance was originally cloned.

Note that the two repository instances are not necessarily identical after the pull. We may have constrained the pull (by instructing the VCS to only pull some of the remote changes). Or the local instance may contain things that are not in the remote instance. In order to completely synchronize two instances, you would have to pull everything from the remote instance and then push everything from the local instance.