NewRepo constructs a repo mirror which will sync itself.

has been read (cloned); no attempt made to write.

no attempt made to clone it yet.

configuration is empty.

has been written to, so ready to sync.

Checkout is a local working clone of the remote repo.

CommitAction - struct holding commit information.

Config holds some values we use when working in the working clone of a repo.

Remote points at a git repo somewhere.

GitRepoStatus represents the progress made synchronising with a git repo.