ClonerUsingGitExec uses a local git install, as opposed to say, some remote API, to obtain a local clone of a remote repo.

DoNothingCloner returns a cloner that only sets cloneDir field in the repoSpec.

NewRepoSpecFromURL parses git-like urls.

RepoSpec specifies a git repository and a branch and path therein.

Cloner is a function that can clone a git repo.