It's somewhat specific to our situation, but the idea is that if you
`9fs server' and you know that there's always a specific file in the
server's root,
if (test -e /n/server/known_file)
foo /n/server
will execute foo only if the 9fs really worked.
--- Begin Message ---
| There was a problem locally wherein losing a file server connection
| was making replica/scan think that all the files had vanished. I've
| taken measures to prevent it happening in future,
What sort of measures? I mean, is there a general purpose strategy that
you used, or is this a special case?
--- End Message ---
