Do executes the provided Wrapper on each repository, operating asynchronously by default.

DoAsync always operates asynchronously regardless of configuration.

DoSync always operates synchronously regardless of configuration.

Exec creates a new CallFunc to execute the given command and arguments, streaming Stdout and Stderr to the channel and returning error status.

Wrap each provided CallFunc into a new Wrapper that executes them in the provided order before closing the channel and terminating.

CallFunc defines an atomic unit of work on a repository.

Wrapper defines all work to be performed on a repository.