The current PipelinePlugin.
A filename to use for the FIFO.
FileExistsException if a FIFO with the same filename already exists, suggesting concurrent conflicting instances of the program (or merely a zombie FIFO after a crash), and a new filename could not be invented.
FileTypeMismatchException if a file or directory exists with the same name as the FIFO we want to create, and a new filename could not be invented.
Resolves the filename of the FIFO to use.