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HLFSD(8)		FreeBSD	System Manager's Manual		      HLFSD(8)

     hlfsd -- home-link	file system daemon

     hlfsd [-fhnpvC] [-a alt_dir] [-c cache-interval] [-g group]
	   [-i reload-interval]	[-l logfile] [-o mount-options]
	   [-x log-options] [-D	debug-options] [-P password-file]
	   [linkname [subdir]]

     This daemon is obsolete.  Users are advised to use	autofs(5) instead.

     The hlfsd utility is a daemon which implements a file system containing a
     symbolic link to subdirectory within a user's home	directory, depending
     on	the user which accessed	that link.  It was primarily designed to redi-
     rect incoming mail	to users' home directories, so that it can read	from

     The hlfsd utility operates	by mounting itself as an NFS server for	the
     directory containing linkname, which defaults to /hlfs/home.  Lookups
     within that directory are handled by hlfsd, which uses the	password map
     to	determine how to resolve the lookup.  The directory will be created if
     it	does not already exist.	 The symbolic link will	be to the accessing
     user's home directory, with subdir	appended to it.	 If not	specified,
     subdir defaults to	.hlfsdir.  This	directory will also be created if it
     does not already exist.

     A SIGTERM sent to hlfsd will cause	it to shutdown.	 A SIGHUP will flush
     the internal caches, and reload the password map.	It will	also close and
     reopen the	log file, to enable the	original log file to be	removed	or ro-
     tated.  A SIGUSR1 will cause it to	dump its internal table	of user	IDs
     and home directories to the file /usr/tmp/hlfsd.dump.XXXXXX.

     -a	alt_dir
	     Alternate directory.  The name of the directory to	which the sym-
	     bolic link	returned by hlfsd will point, if it cannot access the
	     home directory of the user.  This defaults	to /var/hlfs.  This
	     directory will be created if it does not exist.  It is expected
	     that either users will read these files, or the system adminis-
	     trators will run a	script to resend this "lost mail" to its

     -c	cache-interval
	     Caching interval.	The hlfsd utility will cache the validity of
	     home directories for this interval, in seconds.  Entries which
	     have been verified	within the last	cache-interval seconds will
	     not be verified again, since the operation	could be expensive,
	     and the entries are most likely still valid.  After the interval
	     has expired, hlfsd	will re-verify the validity of the user's home
	     directory,	and reset the cache time-counter.  The default value
	     for cache-interval	is 300 seconds (5 minutes).

     -f	     Force fast	startup.  This option tells hlfsd to skip startup-time
	     consistency checks	such as	existence of mount directory, alter-
	     nate spool	directory, symlink to be hidden	under the mount	direc-
	     tory, their permissions and validity.

     -g	group
	     Set the special group HLFS_GID to group.  Programs	such as
	     comsat(8),	(which access the mailboxes of other users) must be
	     setgid HLFS_GID to	work properly.	The default group is "hlfs".
	     If	no group is provided, and there	is no group "hlfs", this fea-
	     ture is disabled.

     -h	     Help.  Print a brief help message,	and exit.

     -i	reload-interval
	     Map-reloading interval.  Each reload-interval seconds, hlfsd will
	     reload the	password map.  The hlfsd utility needs the password
	     map for the UIDs and home directory pathnames.  The hlfsd utility
	     schedules a SIGALRM to reload the password	maps.  A SIGHUP	sent
	     to	hlfsd will force it to reload the maps immediately.  The de-
	     fault value for reload-interval is	900 seconds (15	minutes).

     -l	logfile
	     Specify a log file	to which hlfsd will record events.  If logfile
	     is	the string "syslog" then the log messages will be sent to the
	     system log	daemon by syslog(3), using the LOG_DAEMON facility.
	     This is also the default.

     -n	     No	verify.	 The hlfsd utility will	not verify the validity	of the
	     symbolic link it will be returning, or that the user's home di-
	     rectory contains sufficient disk-space for	spooling.  This	can
	     speed up hlfsd at the cost	of possibly returning symbolic links
	     to	home directories which are not currently accessible or are
	     full.  By default,	hlfsd validates	the symbolic-link in the back-
	     ground.  The -n option overrides the meaning of the -c option,
	     since no caching is necessary.

     -o	mount-options
	     Mount options.  Mount options which hlfsd will use	to mount it-
	     self on top of dirname.  By default, mount-options	is set to
	     "ro".  If the system supports symbolic-link caching, default op-
	     tions are set to "ro,nocache".

     -p	     Print PID.	 Outputs the process ID	of hlfsd to standard output
	     where it can be saved into	a file.

     -v	     Version.  Displays	version	information to standard	error.

     -x	log-options
	     Specify run-time logging options.	The options are	a comma	sepa-
	     rated list	chosen from: fatal, error, user, warn, info, map,
	     stats, all.

     -C	     Force hlfsd to run	on systems that	cannot turn off	the NFS	attri-
	     bute-cache.  Use of this option on	those systems is discouraged,
	     as	it may result in loss or mis-delivery of mail.	The option is
	     ignored on	systems	that can turn off the attribute-cache.

     -D	log-options
	     Select from a variety of debugging	options.  Prefixing an option
	     with the string "no" reverses the effect of that option.  Options
	     are cumulative.  The most useful option is	"all".	Since this op-
	     tion is only used for debugging other options are not documented
	     here.  A fuller description is available in the program source.
	     A SIGUSR1 sent to hlfsd will cause	it to dump its internal	pass-
	     word map to the file /usr/tmp/hlfsd.dump.XXXXXX.

     -P	password-file
	     Read the user-name, user-id, and home directory information from
	     the file password-file.  Normally,	hlfsd will use getpwent(3) to
	     read the password database.  This option allows you to override
	     the default database, and is useful if you	want to	map users'
	     mail files	to a directory other than their	home directory.	 Only
	     the username, uid,	and home-directory fields of the file
	     password-file are read and	checked.  All other fields are ig-
	     nored.  The file password-file must otherwise be compliant	with
	     UNIX System 7 colon-delimited format passwd(5).

     /hlfs	directory under	which hlfsd mounts itself and manages the sym-
		bolic link home.

     .hlfsdir	default	sub-directory in the user's home directory, to which
		the home symbolic link returned	by hlfsd points.

     /var/hlfs	directory to which home	symbolic link returned by hlfsd	points
		if it is unable	to verify the that user's home directory is

     mail(1), getgrent(3), getpwent(3),	mnttab(4), passwd(4), mtab(5), amd(8),
     automount(8), cron(8), mount(8), sendmail(8), umount(8)

     "HLFSD: Delivering	Email to Your $HOME", Proc. LISA-VII, The 7th Usenix
     System Administration Conference, November	1993.

     "am-utils"	info(1)	entry.

     Erez Zadok, Linux NFS and Automounter Administration, Sybex, 2001,	ISBN

     The hlfsd utility appeared	in FreeBSD 3.0.

     Erez Zadok	<>, Computer Science Department, Stony	Brook
     University, Stony Brook, New York,	USA.

     Alexander Dupuy <>, System	Management ARTS, White Plains,
     New York, USA.

     Other authors and contributors to am-utils	are listed in the AUTHORS file
     distributed with am-utils.

FreeBSD	13.0		       February	26, 2016		  FreeBSD 13.0


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