Code review comment for lp://qastaging/~alan-griffiths/mir/make-endpoint-accessible-option

> okay overall, althoug I guess I like "globally-rw-file" over "arw-file". We
> might also want to control based on unix groups, and not need such broad
> permission

Well, the option could take a string we search for u|g|o|a - any votes?

--rw-file arg (=a) Make socket filename rw
                                        (equivalent to chmod <arg>=rw)