Find the context root. Designed for internal use
context_root_get(root, db = NULL)An object; either a character string (interpreted as a
path), a context_root object (such as returned by this
function) or a list/environment object with a root
element that is a context_root object.
Optionally, a copy of the storr database (if already opened). Do not specify this unless you definitely have the correct database in hand.