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IMPORT(4)							     IMPORT(4)

       import - import a name space from a remote system

       import [ options ] system file [ mountpoint ]

       import -m [ options ] system mountpoint

       import -B [ options ] mountpoint [ cmd [ args ...  ] ]

       Import  allows an arbitrary file on a remote system to be imported into
       the local name space.  Usually file is a	 directory,  so	 the  complete
       file tree under the directory is made available.

       A  process is started on the remote machine, with authority of the user
       of import, to perform work for the local machine using the  exportfs(4)
       service.	 The default port used is TCP 17007.  If mountpoint is omitted
       import uses the name of the remote file as the local mount point.

       The options are:

       -a -b -c -C
	      Control the construction of union directories, as in  mount  and
	      bind(1).	Only valid when file is a directory.

       -A     Skip the authentication protocol.	 This is useful for connecting
	      to foreign systems like Inferno.

       -B     Run in ``backwards'' mode, described below.

       -E enc Push an authentication protocol on its network connection.   The
	      supported	 protocols  are	 clear	(the default, no protocol) and
	      ssl.  There are plans to make tls available.

       -e 'enc auth'
	      Specify the encryption and authentication algorithms to use  for
	      encrypting  the  wire  traffic  (see  ssl(3)).  The defaults are
	      rc4_256 and sha1.

       -k keypattern
	      Use keypattern to select a key to	 authenticate  to  the	remote
	      side (see auth(2)).

       -o -O  These  equivalent flags run import in a pre-9P2000 compatibility
	      mode to import from ancient servers.

       -p     Push the aan(8) filter onto the connection  to  protect  against
	      temporary network outages.

       -s name
	      Post the connection's mountable file descriptor as /srv/name.

       The  -m	option mounts a file exported by exportfs(4) with its -r or -S
       options, which skip the part of its protocol that allows	 the  importer
       to  specify  the	 file  to  export.  Instead, the file or name space is
       selected by exportfs, and import mounts it on mountpoint as  guided  by
       the other options.

       The  -B option runs import in ``backwards'' mode.  In this mode, import
       runs a p9any authentication (as server)	over  its  file	 descriptor  0
       (expected  to  be  an  incoming	network	 connection from exportfs -B),
       mounts the connection onto mntpt, and optionally runs cmd args.

       Assume a machine	 kremvax  that	has  IP	 interfaces  for  the  company
       intranet	 and  the global internet mounted on /net and /net.alt respecā€
       tively.	Any machine inside the company	can  get  telnet  out  to  the
       global internet using:

	      import -a kremvax /net.alt
	      telnet /net.alt/tcp!ucbvax

       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:

	      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).


       bind(1), ssl(3), exportfs(4), srv(4), aan(8), listen(8), cs in ndb(8)

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