InsecureSkipCheckVerifySSH controls whether the client verifies the SSH server's certificate or host key.

SetModTime is a boolean indicating whether os.FileInfos representing files should have their ModTime set (which can be slow on large repositories).

A CrossRepo is a git repository that can be used in cross-repo operations (e.g., as the head repository for a cross-repo diff in another git repository's CrossRepoDiff method, or as the 2nd repo in a CrossRepoMergeBase call).