0f58e47551
exportfs -d logs 9p traffic to /tmp/exportdb. -f allows writing to a different file. exportfs silently continues if it doesn't have permissions to create or write to /tmp/exportdb. These are poor behaviors. A better default is to write to stderr, since it is 9P debug info that is better immediately printed, and not user info that is better handled by syslog(). As a result, -f is obsolete and thus removed. Redirect responsibility is now on rc. As a side effect, rc will fail if it doesn't have permissions to write. exportfs(4) is updated to reflect all changes and with a better Synopsis. oexportfs is changed to match exportfs. oexportfs(4) is updated to reflect all changes. The Synopsis is not changed due to the number of flags. Removed -f from iostats. iostats(4) is updated to reflect all changes. ---
181 lines
3 KiB
Plaintext
181 lines
3 KiB
Plaintext
.TH EXPORTFS 4
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.SH NAME
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exportfs, srvfs \- file server plumbing
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.SH SYNOPSIS
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.B exportfs
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[
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.B -dsR
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]
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[
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.B -m
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.I msize
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]
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[
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.B -r
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.I root
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]
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[
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.B -P
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.I patternfile
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]
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[
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.B -S
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.I srvfile
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]
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.PP
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.B srvfs
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[
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.B -dR
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]
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[
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.B -p
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.I perm
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]
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[
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.B -P
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.I patternfile
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] [
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.B -e
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.I exportprog
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]
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.I name
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.I path
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.SH DESCRIPTION
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.I Exportfs
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is a user level file server that allows Plan 9 cpu servers, rather
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than file servers, to export portions of a name space.
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It is usually started by other programs such as
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.IR rcpu (1)
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after a secure channel has been established.
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.I Exportfs
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then acts as a relay file server: operations in the imported file
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tree are executed on the remote server and the results returned. This
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gives the appearance of exporting a name space from a remote machine
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into a local file tree.
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.PP
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The options are:
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.TP
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.B -d
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Log all 9P traffic to standard error.
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.TP
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.B -P \fIpatternfile
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Restrict the set of exported files.
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.I Patternfile
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contains one regular expression per line,
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to be matched against path names
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relative to the current working directory
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and starting with
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.BR / .
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For a file to be exported, all lines with a prefix
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.B +
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must match and all those with prefix
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.B -
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must not match.
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.TP
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.B -R
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Make the served name space read only.
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.TP
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.B -r \fIroot
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Serve the name space rooted at
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.IR root .
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.TP
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.B -S \fIservice
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Serve the result of mounting
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.IR service .
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A separate mount is used for each
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.IR attach (5)
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message,
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to correctly handle servers in which each mount
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corresponds to a different client
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.IR e.g. , (
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.IR rio (4)).
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.TP
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.B -s
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equivalent to
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.B -r
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.BR / ;
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kept for compatibility.
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.TP
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.B -m \fImsize
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Set the maximum message size that
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.I exportfs
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should offer to send (see
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.IR version (5));
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this helps tunneled
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9P connections to avoid unnecessary fragmentation.
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.PD
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.PP
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.I Srvfs
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invokes
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.I exportprog
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(default
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.BR /bin/exportfs )
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to create a mountable file system from a name space
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and posts it at
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.BI /srv/ name ,
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which is created with mode
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.I perm
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(default 0600).
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The name space is the directory tree rooted at
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.IR path .
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The
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.BR -d ,
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.BR -P ,
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and
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.B -R
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options, if present, are relayed to
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.IR exportprog .
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.SH EXAMPLES
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To export the archive of one user for one month, except for secrets,
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.IP
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.EX
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cd /n/dump
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echo '+ ^/(2003(/10..(/usr(/glenda/?)?)?)?)?' > /tmp/pattern
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echo '- \e.(aes|pgp)$' >> /tmp/pattern
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exportfs -P /tmp/pattern
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.EE
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.LP
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Use
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.I srvfs
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to enable mounting of an FTP file system (see
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.IR ftpfs (4))
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in several windows,
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or to publish a
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.B /proc
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(see
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.IR proc (3))
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with a broken process so a remote person may debug the program:
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.IP
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.EX
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srvfs ftp /n/ftp
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srvfs broke /mnt/term/proc
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.EE
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.LP
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Use
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.I srvfs
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to obtain a copy of a service to be manipulated directly
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by a user program like
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.IR nfsserver (8):
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.IP
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.EX
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srvfs nfs.boot /srv/boot
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aux/nfsserver -f /srv/nfs.boot
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.EE
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.LP
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Use
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.I srvfs
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to spy on all accesses to a particular subtree:
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.IP
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.EX
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srvfs -d spy /
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tail -f /tmp/exportdb &
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mount /srv/spy /n/spy
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cd /n/spy; ls
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.EE
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.SH SOURCE
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.B /sys/src/cmd/exportfs
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.br
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.B /sys/src/cmd/srvfs.c
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.SH SEE ALSO
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.IR rcpu (1)
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