Builder builds a list of observers suitable for single-shot c4t corpus-builder binaries.

Copier builds a list of observers suitable for observing file copies in single-shot binaries.

Coverage builds a list of observers suitable for observing coverage testbed generation.

DirectorInstance builds a list of director-instance compatible observers suitable for single-shot binaries.

MachNode builds a list of observers suitable for observing machine node actions in single-shot binaries.

NewBar creates a new observer.

Perturber builds a list of observers suitable for single-shot c4t perturber binaries.

Planner builds a list of observers suitable for single-shot c4t planner binaries.

Bar is a builder observer that uses a progress bar.

Logger lifts a Logger to an observer.