c4d9468ea0
Avoid using parenthesis enclosure macros (.Pq and .Po/.Pc) with plain text. Not only this slows down the mdoc(7) processing significantly, but it also has an undesired (in this case) effect of disabling hyphenation within the entire enclosed block.
320 lines
9.3 KiB
Groff
320 lines
9.3 KiB
Groff
.\"
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.\" Copyright (c) 1997-1999 Erez Zadok
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.\" Copyright (c) 1989 Jan-Simon Pendry
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.\" Copyright (c) 1989 Imperial College of Science, Technology & Medicine
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.\" Copyright (c) 1989 The Regents of the University of California.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Jan-Simon Pendry at Imperial College, London.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgment:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: hlfsd.8,v 1.2 1999/01/10 21:54:32 ezk Exp $
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.\" $FreeBSD$
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.\"
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.\" HLFSD was written at Columbia University Computer Science Department, by
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.\" Erez Zadok <ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@smarts.com>
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.\" It is distributed under the same terms and conditions as AMD.
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.\"
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.Dd September 14, 1993
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.Dt HLFSD 8
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.Os
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.Sh NAME
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.Nm hlfsd
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.Nd home-link file system daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl fhnpvC
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.Op Fl a Ar alt_dir
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.Bk -words
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.Op Fl c Ar cache-interval
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.Ek
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.Op Fl g Ar group
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.Bk -words
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.Op Fl i Ar reload-interval
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.Ek
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.Op Fl l Ar logfile
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.Bk -words
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.Op Fl o Ar mount-options
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.Op Fl x Ar log-options
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.Op Fl D Ar debug-options
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.Op Fl P Ar password-file
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.Ek
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.Op linkname Op subdir
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.Sh DESCRIPTION
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.Nm
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is a daemon which implements a filesystem containing a symbolic link to
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subdirectory within a user's home directory, depending on the user
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which accessed that link. It was primarily designed to redirect
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incoming mail to users' home directories, so that it can read from
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anywhere.
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.Pp
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.Nm
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operates by mounting itself as an
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.Tn NFS
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server for the directory containing
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.Ar linkname ,
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which defaults to
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.Pa /hlfs/home .
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Lookups within that directory are handled by
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.Nm hlfsd ,
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which uses the password map to determine how to resolve the lookup. The
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directory will be created if it doesn't already exist. The symbolic link will
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be to the accessing user's home directory, with
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.Ar subdir
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appended to it. If not specified,
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.Ar subdir
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defaults to
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.Pa .hlfsdir .
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This directory will also be created if it does not already exist.
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.Pp
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A
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.Er SIGHUP
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will flush the internal caches, and reload the password map. It will also
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close and reopen the log file, to enable the original log file to be removed
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or rotated. A
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.Er SIGUSR1
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will cause it to dump its internal table of user IDs and home directories to
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the file
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.Pa /usr/tmp/hlfsd.dump.XXXXXX .
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.Sh OPTIONS
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.Bl -tag -width Ds
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.It Fl a Ar alt_dir
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Alternate directory. The name of the directory to which
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the symbolic link returned by
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.Nm
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will point, if it cannot access the home directory of the user. This
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defaults to
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.Pa /var/hlfs .
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This directory will be created if it doesn't exist. It is expected
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that either users will read these files, or the system administrators
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will run a script to resend this
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.Dq lost mail
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to its owner.
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.It Fl c Ar cache-interval
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Caching interval.
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.Nm
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will cache the validity of home directories for this interval, in
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seconds. Entries which have been verified within the last
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.Ar cache-interval
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seconds will not be verified again, since the operation could
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be expensive, and the entries are most likely still valid.
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After the interval has expired,
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.Nm
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will re-verify the validity of the user's home directory, and
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reset the cache time-counter. The default value for
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.Ar cache-interval
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is 300 seconds
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(5 minutes).
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.It Fl f
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Force fast startup. This option tells
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.Nm
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to skip startup-time consistency checks such as existence of mount
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directory, alternate spool directory, symlink to be hidden under the
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mount directory, their permissions and validity.
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.It Fl g Ar group
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Set the special group
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.Va HLFS_GID
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to
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.Ar group .
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Programs such as
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.Ic comsat ,
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(which access the mailboxes of other users)
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must be setgid
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.Va HLFS_GID
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to work properly. The default group is
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.Dq hlfs .
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If no group is provided, and there is no group
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.Dq hlfs ,
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this feature is disabled.
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.It Fl h
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Help. Print a brief help message, and exit.
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.It Fl i Ar reload-interval
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Map-reloading interval. Each
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.Ar reload-interval
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seconds,
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.Nm
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will reload the password map.
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.Nm
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needs the password map for the UIDs and home directory pathnames.
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.Nm
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schedules a
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.Va SIGALRM
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to reload the password maps. A
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.Va SIGHUP
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sent to
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.Nm
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will force it to reload the maps immediately. The default value for
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.Ar reload-interval
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is 900 seconds
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(15 minutes).
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.It Fl l Ar logfile
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Specify a log file to which
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.Nm
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will record events. If
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.Pa logfile
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is the string
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.Pa syslog
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then the log messages will be sent to the system log daemon by
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.Xr syslog 3 ,
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using the
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.Va LOG_DAEMON
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facility. This is also the default.
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.It Fl n
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No verify.
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.Nm
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will not verify the validity of the symbolic link it will be
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returning, or that the user's home directory contains
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sufficient disk-space for spooling. This can speed up
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.Nm
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at the cost of possibly returning symbolic links to home
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directories which are not currently accessible or are full.
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By default,
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.Nm
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validates the symbolic-link in the background.
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The
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.Fl n
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option overrides the meaning of the
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.Fl c
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option, since no caching is necessary.
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.It Fl o Ar mount-options
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Mount options. Mount options which
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.Nm
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will use to mount itself on top of
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.Pa dirname .
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By default,
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.Ar mount-options
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is set to
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.Qq ro .
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If the system supports symbolic-link caching, default
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options are set to
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.Qq ro,nocache .
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.It Fl p
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Prints
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.Va PID .
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Outputs the process-id of
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.Nm
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to standard output where it can be saved into a file.
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.It Fl v
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Version. Displays version information to standard error.
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.It Fl x Ar log-options
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Specify run-time logging options. The options are a comma separated
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list chosen from: fatal, error, user, warn, info, map, stats, all.
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.It Fl C
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Force
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.Nm
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to run on systems that cannot turn off the NFS attribute-cache. Use of
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this option on those systems is discouraged, as it may result in loss
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or misdelivery of mail. The option is ignored on systems that can turn
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off the attribute-cache.
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.It Fl D Ar log-options
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Select from a variety of debugging options. Prefixing an
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option with the string
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.Qq no
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reverses the effect of that option. Options are cumulative.
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The most useful option is
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.Em all .
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Since this option is only used for debugging other options are not
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documented here. A fuller description is available in the program
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source. A
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.Va SIGUSR1
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sent to
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.Nm
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will cause it to dump its internal password map to the file
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.Pa /usr/tmp/hlfsd.dump.XXXXXX .
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.It Fl P Ar password-file
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Read the user-name, user-id, and home directory information from the file
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.Ar password-file .
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Normally,
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.Nm
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will use
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.Xr getpwent 3
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to read the password database. This option allows you to override the
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default database, and is useful if you want to map users' mail files to a
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directory other than their home directory. Only the username, uid, and
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home-directory fields of the file
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.Ar password-file
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are read and checked. All other fields are ignored. The file
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.Ar password-file
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must be compliant with
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.Ux
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System 7 colon-delimited format
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.Xr passwd 5 .
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.El
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.Sh FILES
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.Bl -tag -width /axx
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.It Pa /hlfs
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directory under which
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.Nm
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mounts itself and manages the symbolic link
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.Pa home .
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.It Pa .hlfsdir
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default sub-directory in the user's home directory, to which the
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.Pa home
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symbolic link returned by
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.Nm
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points.
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.It Pa /var/hlfs
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directory to which
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.Pa home
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symbolic link returned by
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.Nm
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points if it is unable to verify the that
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user's home directory is accessible.
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.El
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.Sh SEE ALSO
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.Xr mail 1 ,
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.Xr getgrent 3 ,
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.Xr getpwent 3 ,
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.Xr mtab 5 ,
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.Xr passwd 5 ,
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.Xr amd 8 ,
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.Xr cron 8 ,
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.Xr mount 8 ,
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.Xr sendmail 8 ,
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.Xr umount 8
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.Rs
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.%T HLFSD: Delivering Email to Your $HOME
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.%B Proc. LISA-VII, The 7th Usenix System Administration Conference
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.%D November 1993
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.Re
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.Sh AUTHORS
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.An Erez Zadok Aq ezk@cs.columbia.edu ,
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Department of Computer Science, Columbia University,
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New York, USA.
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.Pp
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.An Alexander Dupuy Aq dupuy@smarts.com ,
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System Management ARTS, White Plains, New York, USA.
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 3.0 .
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