ReadSubjectFile is a low-level function for reading a subject file with path path, relative to directory root.

RecipeDir gets the normalised recipe directory under root and for architecture ID-string arch.

DirCompiles is the normalised directory for compile results.

DirRecipes is the normalised directory for recipe results.

FileBin is the normalised name for output binaries.

FileCompileLog is the normalised name for compilation logs.

FileFuzzLitmus is the normalised name for post-fuzz litmus tests.

FileFuzzTrace is the normalised name for fuzzer traces.

FileOrigLitmus is the normalised name for pre-fuzz litmus tests.

TarSuffix is the extension used by the saver when saving tarballs, and presumed by archive-transparent file readers.

ErrMissingFile occurs when we request a subject file but it isn't available.