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IMPORT(4)                  Kernel Interfaces Manual                  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 se‐
       lected 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 (ex‐
       pected  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  in‐
       tranet  and  the  global  internet mounted on /net and /net.alt respec‐
       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)