pub async fn disk(inbox: Receiver<Val>, back: Sender<Event>)Expand description
('host disk): ('write path text), answering 'ok.
A second peer rather than a second verb on files, because a peer is the
unit of granting and a host may want reads without writes. It creates
nothing but the file: a missing directory is an error, since a mistyped
path would otherwise get a tree instead of a complaint.