Specifies for a given directory dir
directories_generated_from = None
, jenga will assume dir
exists.
If directories_generated_from = Some path
, then path
must be a prefix of dir
,
and jenga will create all the ancestors of dir
and descendants of path
(both inclusive) as needed.
These values are assumed to be consistent, ie if the specification for dir
states
directories_generated_from = Some path
, then the specification for any directory
below path
(inclusive) must state the same.