From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <c2fcd790e1ba2a621584dba594b8d0ea@quintile.net>
From: "Steve Simon" <steve@quintile.net>
Date: Fri, 22 Oct 2010 13:01:21 +0100
To: 9fans@9fans.net
MIME-Version: 1.0
Content-Type: text/plain; charset="US-ASCII"
Content-Transfer-Encoding: 7bit
Subject: [9fans] import/export -B
Topicbox-Message-UUID: 6c4bf578-ead6-11e9-9d60-3106f5b1d025

I am a little confused by import/export -B (backwards).

The only bit I don't get is why you have to supply a mountpoint to import.
Surely import will always be running from listen and as such it will not
be in any useful namespace so why mount anything?

from the manpage:

          Suppose that the machine moscvax has access to a private
          file server containing public web pages that need to be
          served by the less-trusted server webvax.  Webvax runs the
          following listener (see listen(8)) on TCP port 999:

               #!/bin/rc
               import -B -s rowebfs /usr/web /bin/restarthttpd

          When moscvax boots, it runs

               exportfs -R -r /usr/web -B tcp!webvax!999

          to serve a read-only copy of /usr/web to webvax.  When
          webvax gets the call, import mounts the served tree onto its
          own /usr/web and then runs /bin/restarthttpd to restart
          httpd(8).

It seems to me that my restarthpptd script will be
		'unmount /usr/web; chmod 600 /srv/rowebfs'

I find it strange that the mountpoint is not optional (as long as -s srv names exists).

perhaps I am missing somthing? or maybe its just a quirk?

-Steve