1 # $NetBSD: rc.subr,v 1.67 2006/10/07 11:25:15 elad Exp $
4 # Copyright (c) 1997-2004 The NetBSD Foundation, Inc.
7 # This code is derived from software contributed to The NetBSD Foundation
10 # Redistribution and use in source and binary forms, with or without
11 # modification, are permitted provided that the following conditions
13 # 1. Redistributions of source code must retain the above copyright
14 # notice, this list of conditions and the following disclaimer.
15 # 2. Redistributions in binary form must reproduce the above copyright
16 # notice, this list of conditions and the following disclaimer in the
17 # documentation and/or other materials provided with the distribution.
19 # THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 # ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 # BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 # POSSIBILITY OF SUCH DAMAGE.
32 # functions used by various rc scripts
35 : ${RC_PID:=$$}; export RC_PID
38 # Operating System dependent/independent variables
41 if [ -n "${_rc_subr_loaded}" ]; then
48 SYSCTL_N="${SYSCTL} -n"
50 PROTECT="/usr/bin/protect"
52 IDCMD="if [ -x $ID ]; then $ID -un; fi"
61 # List vars matching pattern.
65 set | { while read LINE; do
68 "$LINE"|*[!a-zA-Z0-9_]*) continue ;;
74 # set_rcvar [var] [defval] [desc]
76 # Echo or define a rc.conf(5) variable name. Global variable
79 # If no argument is specified, echo "${name}_enable".
81 # If only a var is specified, echo "${var}_enable".
83 # If var and defval are specified, the ${var} is defined as
84 # rc.conf(5) variable and the default value is ${defvar}. An
85 # optional argument $desc can also be specified to add a
86 # description for that.
93 0) echo ${name}_enable ;;
94 1) echo ${1}_enable ;;
96 debug "set_rcvar: \$$1=$2 is added" \
97 " as a rc.conf(5) variable."
99 rcvars="${rcvars# } $_var"
100 eval ${_var}_defval=\"$2\"
102 eval ${_var}_desc=\"$*\"
107 # set_rcvar_obsolete oldvar [newvar] [msg]
108 # Define obsolete variable.
109 # Global variable $rcvars_obsolete is used.
115 debug "set_rcvar_obsolete: \$$1(old) -> \$$2(new) is defined"
117 rcvars_obsolete="${rcvars_obsolete# } $1"
118 eval ${1}_newvar=\"$2\"
120 eval ${_var}_obsolete_msg=\"$*\"
124 # force_depend script [rcvar]
125 # Force a service to start. Intended for use by services
126 # to resolve dependency issues.
127 # $1 - filename of script, in /etc/rc.d, to run
128 # $2 - name of the script's rcvar (minus the _enable)
132 local _depend _dep_rcvar
135 _dep_rcvar="${2:-$1}_enable"
137 [ -n "$rc_fast" ] && ! checkyesno always_force_depends &&
138 checkyesno $_dep_rcvar && return 0
140 /etc/rc.d/${_depend} forcestatus >/dev/null 2>&1 && return 0
142 info "${name} depends on ${_depend}, which will be forced to start."
143 if ! /etc/rc.d/${_depend} forcestart; then
144 warn "Unable to force ${_depend}. It may already be running."
151 # Test $1 variable, and warn if not set to YES or NO.
152 # Return 0 if it's "yes" (et al), nonzero otherwise.
157 debug "checkyesno: $1 is set to $_value."
160 # "yes", "true", "on", or "1"
161 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
165 # "no", "false", "off", or "0"
166 [Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
170 warn "\$${1} is not set properly - see rc.conf(5)."
178 # print the list in reverse order
184 _revlist="$_revfile $_revlist"
190 # If booting directly to multiuser or $always is enabled,
191 # send SIGTERM to the parent (/etc/rc) to abort the boot.
192 # Otherwise just exit.
199 # "yes", "true", "on", or "1"
200 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
207 if [ "$autoboot" = yes -o "$always" = true ]; then
208 echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
215 # mount_critical_filesystems type
216 # Go through the list of critical filesystems as provided in
217 # the rc.conf(5) variable $critical_filesystems_${type}, checking
218 # each one to see if it is mounted, and if it is not, mounting it.
220 mount_critical_filesystems()
222 eval _fslist=\$critical_filesystems_${1}
223 for _fs in $_fslist; do
226 while read what _on on _type type; do
227 if [ $on = $_fs ]; then
234 mount $_fs >/dev/null 2>&1
241 # check_pidfile pidfile procname [interpreter]
242 # Parses the first line of pidfile for a PID, and ensures
243 # that the process is running and matches procname.
244 # Prints the matching PID upon success, nothing otherwise.
245 # interpreter is optional; see _find_processes() for details.
252 if [ -z "$_pidfile" -o -z "$_procname" ]; then
253 err 3 'USAGE: check_pidfile pidfile procname [interpreter]'
255 if [ ! -f $_pidfile ]; then
256 debug "pid file ($_pidfile): not readable."
259 read _pid _junk < $_pidfile
260 if [ -z "$_pid" ]; then
261 debug "pid file ($_pidfile): no pid in file."
264 _find_processes $_procname ${_interpreter:-.} '-p '"$_pid"
268 # check_process procname [interpreter]
269 # Ensures that a process (or processes) named procname is running.
270 # Prints a list of matching PIDs.
271 # interpreter is optional; see _find_processes() for details.
277 if [ -z "$_procname" ]; then
278 err 3 'USAGE: check_process procname [interpreter]'
280 _find_processes $_procname ${_interpreter:-.} '-ax'
284 # _find_processes procname interpreter psargs
285 # Search for procname in the output of ps generated by psargs.
286 # Prints the PIDs of any matching processes, space separated.
288 # If interpreter == ".", check the following variations of procname
289 # against the first word of each command:
291 # `basename procname`
292 # `basename procname` + ":"
293 # "(" + `basename procname` + ")"
294 # "[" + `basename procname` + "]"
296 # If interpreter != ".", read the first line of procname, remove the
297 # leading #!, normalise whitespace, append procname, and attempt to
298 # match that against each command, either as is, or with extra words
299 # at the end. As an alternative, to deal with interpreted daemons
300 # using perl, the basename of the interpreter plus a colon is also
301 # tried as the prefix to procname.
305 if [ $# -ne 3 ]; then
306 err 3 'USAGE: _find_processes procname interpreter psargs'
313 if [ $_interpreter != "." ]; then # an interpreted script
314 _script="${_chroot}${_chroot:+/}$_procname"
315 if [ -r "$_script" ]; then
316 read _interp < $_script # read interpreter name
319 _interp=${_interp#\#!} # strip #!
323 shift # drop env to get real name
326 if [ $_interpreter != $1 ]; then
327 warn "\$command_interpreter $_interpreter != $1"
331 warn "no shebang line in $_script"
336 warn "cannot read shebang line from $_script"
339 _interp="$* $_procname" # cleanup spaces, add _procname
342 _fp_match='case "$_argv" in
343 ${_interp}|"${_interp} "*|"[${_interpbn}]"|"${_interpbn}: ${_procname}"*)'
344 else # a normal daemon
345 _procnamebn=${_procname##*/}
346 _fp_args='_arg0 _argv'
347 _fp_match='case "$_arg0" in
348 $_procname|$_procnamebn|${_procnamebn}:|"(${_procnamebn})"|"[${_procnamebn}]")'
352 $PS 2>/dev/null -o pid= -o jid= -o command= $_psargs"' |
353 while read _npid _jid '"$_fp_args"'; do
355 if [ "$JID" -eq "$_jid" ];
356 then echo -n "$_pref$_npid";
363 # debug "in _find_processes: proccheck is ($_proccheck)."
367 # sort_lite [-b] [-n] [-k POS] [-t SEP]
368 # A lite version of sort(1) (supporting a few options) that can be used
369 # before the real sort(1) is available (e.g., in scripts that run prior
370 # to mountcritremote). Requires only shell built-in functionality.
374 local funcname=sort_lite
375 local sort_sep="$IFS" sort_ignore_leading_space=
376 local sort_field=0 sort_strict_fields= sort_numeric=
377 local nitems=0 skip_leading=0 trim=
380 while getopts bnk:t: flag; do
382 b) sort_ignore_leading_space=1 ;;
383 n) sort_numeric=1 sort_ignore_leading_space=1 ;;
384 k) sort_field="${OPTARG%%,*}" ;; # only up to first comma
385 # NB: Unlike sort(1) only one POS allowed
386 t) sort_sep="$OPTARG"
387 if [ ${#sort_sep} -gt 1 ]; then
388 echo "$funcname: multi-character tab \`$sort_sep'" >&2
396 shift $(( $OPTIND - 1 ))
398 # Create transformation pattern to trim leading text if desired
399 case "$sort_field" in
400 ""|[!0-9]*|*[!0-9.]*)
401 echo "$funcname: invalid sort field \`$sort_field'" >&2
405 skip_leading=${sort_field#*.} sort_field=${sort_field%%.*}
406 while [ ${skip_leading:-0} -gt 1 ] 2> /dev/null; do
407 trim="$trim?" skip_leading=$(( $skip_leading - 1 ))
411 # Copy input to series of local numbered variables
412 # NB: IFS of NULL preserves leading whitespace
414 while IFS= read -r LINE || [ "$LINE" ]; do
415 nitems=$(( $nitems + 1 ))
416 local src_$nitems="$LINE"
420 # Sort numbered locals using insertion sort
422 local curitem curitem_orig curitem_mod curitem_haskey
423 local dest dest_orig dest_mod dest_haskey
426 while [ $i -le $nitems ]; do
427 curitem_haskey=1 # Assume sort field (-k POS) exists
428 eval curitem=\"\$src_$i\"
429 curitem_mod="$curitem" # for modified comparison
430 curitem_orig="$curitem" # for original comparison
432 # Trim leading whitespace if desired
433 if [ "$sort_ignore_leading_space" ]; then
434 while case "$curitem_orig" in
435 [$IFS]*) : ;; *) false; esac
437 curitem_orig="${curitem_orig#?}"
439 curitem_mod="$curitem_orig"
442 # Shift modified comparison value if sort field (-k POS) is > 1
444 while [ $n -gt 1 ]; do
445 case "$curitem_mod" in
447 # Cut text up-to (and incl.) first separator
448 curitem_mod="${curitem_mod#*[$sort_sep]}"
450 # Skip NULLs unless strict field splitting
451 [ "$sort_strict_fields" ] ||
452 [ "${curitem_mod%%[$sort_sep]*}" ] ||
457 # Asked for a field that doesn't exist
458 curitem_haskey= break
463 # Trim trailing words if sort field >= 1
464 [ $sort_field -ge 1 -a "$sort_numeric" ] &&
465 curitem_mod="${curitem_mod%%[$sort_sep]*}"
467 # Apply optional trim (-k POS.TRIM) to cut leading characters
468 curitem_mod="${curitem_mod#$trim}"
470 # Determine the type of modified comparison to use initially
471 # NB: Prefer numerical if requested but fallback to standard
472 case "$curitem_mod" in
473 ""|[!0-9]*) # NULL or begins with non-number
475 [ "$sort_numeric" ] && curitem_mod=0
478 if [ "$sort_numeric" ]; then
480 curitem_mod="${curitem_mod%%[!0-9]*}"
481 # NB: trailing non-digits removed
482 # otherwise numeric comparison fails
488 # If first time through, short-circuit below position-search
489 if [ $i -le 1 ]; then
496 # Find appropriate element position
500 dest_haskey=$curitem_haskey
501 eval dest=\"\$dest_$d\"
502 dest_mod="$dest" # for modified comparison
503 dest_orig="$dest" # for original comparison
505 # Trim leading whitespace if desired
506 if [ "$sort_ignore_leading_space" ]; then
507 while case "$dest_orig" in
508 [$IFS]*) : ;; *) false; esac
510 dest_orig="${dest_orig#?}"
512 dest_mod="$dest_orig"
515 # Shift modified value if sort field (-k POS) is > 1
517 while [ $n -gt 1 ]; do
520 # Cut text up-to (and incl.) 1st sep
521 dest_mod="${dest_mod#*[$sort_sep]}"
523 # Skip NULLs unless strict fields
524 [ "$sort_strict_fields" ] ||
525 [ "${dest_mod%%[$sort_sep]*}" ] ||
530 # Asked for a field that doesn't exist
536 # Trim trailing words if sort field >= 1
537 [ $sort_field -ge 1 -a "$sort_numeric" ] &&
538 dest_mod="${dest_mod%%[$sort_sep]*}"
540 # Apply optional trim (-k POS.TRIM), cut leading chars
541 dest_mod="${dest_mod#$trim}"
543 # Determine type of modified comparison to use
544 # NB: Prefer numerical if requested, fallback to std
546 ""|[!0-9]*) # NULL or begins with non-number
548 [ "$sort_numeric" ] && dest_mod=0
551 if [ "$sort_numeric" ]; then
553 dest_mod="${dest_mod%%[!0-9]*}"
554 # NB: kill trailing non-digits
555 # for numeric comparison safety
561 # Break if we've found the proper element position
562 if [ "$curitem_haskey" -a "$dest_haskey" ]; then
563 if [ "$dest_mod" = "$curitem_mod" ]; then
564 [ "$dest_orig" ">" "$curitem_orig" ] &&
566 elif [ "$dest_mod" $gt "$curitem_mod" ] \
572 [ "$dest_orig" ">" "$curitem_orig" ] && break
575 # Break if we've hit the end
576 [ $d -ge $i ] && break
581 # Shift remaining positions forward, making room for new item
583 while [ $n -ge $d ]; do
584 # Shift destination item forward one placement
585 eval dest_$(( $n + 1 ))=\"\$dest_$n\"
590 if [ $i -eq 1 ]; then
591 local dest_1="$curitem"
593 local dest_$d="$curitem"
599 # Print sorted results
601 while [ $d -le $nitems ]; do
602 eval echo \"\$dest_$d\"
608 # wait_for_pids pid [pid ...]
609 # spins until none of the pids exist
613 local _list _prefix _nlist _j
616 if [ -z "$_list" ]; then
623 if kill -0 $_j 2>/dev/null; then
624 _nlist="${_nlist}${_nlist:+ }$_j"
625 [ -n "$_prefix" ] && sleep 1
628 if [ -z "$_nlist" ]; then
632 echo -n ${_prefix:-"Waiting for PIDS: "}$_list
634 pwait $_list 2>/dev/null
636 if [ -n "$_prefix" ]; then
642 # get_pidfile_from_conf string file
644 # Takes a string to search for in the specified file.
645 # Ignores lines with traditional comment characters.
649 # if get_pidfile_from_conf string file; then
650 # pidfile="$_pidfile_from_conf"
652 # pidfile='appropriate default'
655 get_pidfile_from_conf()
657 if [ -z "$1" -o -z "$2" ]; then
658 err 3 "USAGE: get_pidfile_from_conf string file ($name)"
661 local string file line
663 string="$1" ; file="$2"
665 if [ ! -s "$file" ]; then
666 err 3 "get_pidfile_from_conf: $file does not exist ($name)"
671 *[#\;]*${string}*) continue ;;
672 *${string}*) break ;;
676 if [ -n "$line" ]; then
678 _pidfile_from_conf="/${line%%[\"\;]*}"
686 # If rc_quiet is set (usually as a result of using faststart at
687 # boot time) check if rc_startmsgs is enabled.
691 if [ -n "$rc_quiet" ]; then
692 checkyesno rc_startmsgs
699 # run_rc_command argument
700 # Search for argument in the list of supported commands, which is:
701 # "start stop restart rcvar status poll ${extra_commands}"
702 # If there's a match, run ${argument}_cmd or the default method
705 # If argument has a given prefix, then change the operation as follows:
708 # fast Skip the pid check, and set rc_fast=yes, rc_quiet=yes
709 # force Set ${rcvar} to YES, and set rc_force=yes
710 # one Set ${rcvar} to YES
711 # quiet Don't output some diagnostics, and set rc_quiet=yes
713 # The following globals are used:
715 # Name Needed Purpose
716 # ---- ------ -------
717 # name y Name of script.
719 # command n Full path to command.
720 # Not needed if ${rc_arg}_cmd is set for
723 # command_args n Optional args/shell directives for command.
725 # command_interpreter n If not empty, command is interpreted, so
726 # call check_{pidfile,process}() appropriately.
728 # desc n Description of script.
730 # extra_commands n List of extra commands supported.
732 # pidfile n If set, use check_pidfile $pidfile $command,
733 # otherwise use check_process $command.
734 # In either case, only check if $command is set.
736 # procname n Process name to check for instead of $command.
738 # rcvar n This is checked with checkyesno to determine
739 # if the action should be run.
741 # ${name}_program n Full path to command.
742 # Meant to be used in /etc/rc.conf to override
745 # ${name}_chroot n Directory to chroot to before running ${command}
746 # Requires /usr to be mounted.
748 # ${name}_chdir n Directory to cd to before running ${command}
749 # (if not using ${name}_chroot).
751 # ${name}_flags n Arguments to call ${command} with.
752 # NOTE: $flags from the parent environment
753 # can be used to override this.
755 # ${name}_env n Environment variables to run ${command} with.
757 # ${name}_env_file n File to source variables to run ${command} with.
759 # ${name}_fib n Routing table number to run ${command} with.
761 # ${name}_nice n Nice level to run ${command} at.
763 # ${name}_oomprotect n Don't kill ${command} when swap space is exhausted.
765 # ${name}_user n User to run ${command} as, using su(1) if not
766 # using ${name}_chroot.
767 # Requires /usr to be mounted.
769 # ${name}_group n Group to run chrooted ${command} as.
770 # Requires /usr to be mounted.
772 # ${name}_groups n Comma separated list of supplementary groups
773 # to run the chrooted ${command} with.
774 # Requires /usr to be mounted.
776 # ${name}_prepend n Command added before ${command}.
778 # ${name}_login_class n Login class to use, else "daemon".
780 # ${name}_limits n limits(1) to apply to ${command}.
782 # ${rc_arg}_cmd n If set, use this as the method when invoked;
783 # Otherwise, use default command (see below)
785 # ${rc_arg}_precmd n If set, run just before performing the
786 # ${rc_arg}_cmd method in the default
787 # operation (i.e, after checking for required
788 # bits and process (non)existence).
789 # If this completes with a non-zero exit code,
790 # don't run ${rc_arg}_cmd.
792 # ${rc_arg}_postcmd n If set, run just after performing the
793 # ${rc_arg}_cmd method, if that method
794 # returned a zero exit code.
796 # required_dirs n If set, check for the existence of the given
797 # directories before running a (re)start command.
799 # required_files n If set, check for the readability of the given
800 # files before running a (re)start command.
802 # required_modules n If set, ensure the given kernel modules are
803 # loaded before running a (re)start command.
804 # The check and possible loads are actually
805 # done after start_precmd so that the modules
806 # aren't loaded in vain, should the precmd
807 # return a non-zero status to indicate a error.
808 # If a word in the list looks like "foo:bar",
809 # "foo" is the KLD file name and "bar" is the
810 # module name. If a word looks like "foo~bar",
811 # "foo" is the KLD file name and "bar" is a
812 # egrep(1) pattern matching the module name.
813 # Otherwise the module name is assumed to be
814 # the same as the KLD file name, which is most
815 # common. See load_kld().
817 # required_vars n If set, perform checkyesno on each of the
818 # listed variables before running the default
821 # Default behaviour for a given argument, if no override method is
824 # Argument Default behaviour
825 # -------- -----------------
826 # start if !running && checkyesno ${rcvar}
830 # rc_pid=$(check_pidfile $pidfile $command)
832 # rc_pid=$(check_process $command)
833 # kill $sig_stop $rc_pid
834 # wait_for_pids $rc_pid
835 # ($sig_stop defaults to TERM.)
837 # reload Similar to stop, except use $sig_reload instead,
838 # and doesn't wait_for_pids.
839 # $sig_reload defaults to HUP.
840 # Note that `reload' isn't provided by default,
841 # it should be enabled via $extra_commands.
843 # restart Run `stop' then `start'.
845 # status Show if ${command} is running, etc.
847 # poll Wait for ${command} to exit.
849 # rcvar Display what rc.conf variable is used (if any).
851 # enabled Return true if the service is enabled.
853 # describe Show the service's description
855 # extracommands Show the service's extra commands
857 # Variables available to methods, and after run_rc_command() has
862 # rc_arg Argument to command, after fast/force/one processing
865 # rc_flags Flags to start the default command with.
866 # Defaults to ${name}_flags, unless overridden
867 # by $flags from the environment.
868 # This variable may be changed by the precmd method.
870 # rc_pid PID of command (if appropriate)
872 # rc_fast Not empty if "fast" was provided (q.v.)
874 # rc_force Not empty if "force" was provided (q.v.)
876 # rc_quiet Not empty if "quiet" was provided
883 if [ -z "$name" ]; then
884 err 3 'run_rc_command: $name is not set.'
887 # Don't repeat the first argument when passing additional command-
888 # line arguments to the command subroutines.
895 fast*) # "fast" prefix; don't check pid
896 rc_arg=${rc_arg#fast}
900 force*) # "force" prefix; always run
903 rc_arg=${rc_arg#${_rc_prefix}}
904 if [ -n "${rcvar}" ]; then
908 one*) # "one" prefix; set ${rcvar}=yes
910 rc_arg=${rc_arg#${_rc_prefix}}
911 if [ -n "${rcvar}" ]; then
915 quiet*) # "quiet" prefix; omit some messages
917 rc_arg=${rc_arg#${_rc_prefix}}
922 eval _override_command=\$${name}_program
923 command=${_override_command:-$command}
925 _keywords="start stop restart rcvar enabled describe extracommands $extra_commands"
928 _procname=${procname:-${command}}
930 # setup pid check command
931 if [ -n "$_procname" ]; then
932 if [ -n "$pidfile" ]; then
933 _pidcmd='rc_pid=$(check_pidfile '"$pidfile $_procname $command_interpreter"')'
935 _pidcmd='rc_pid=$(check_process '"$_procname $command_interpreter"')'
937 _keywords="${_keywords} status poll"
940 if [ -z "$rc_arg" ]; then
944 if [ "$rc_arg" = "enabled" ] ; then
949 if [ -n "$flags" ]; then # allow override from environment
952 eval rc_flags=\$${name}_flags
954 eval _chdir=\$${name}_chdir _chroot=\$${name}_chroot \
955 _nice=\$${name}_nice _user=\$${name}_user \
956 _group=\$${name}_group _groups=\$${name}_groups \
957 _fib=\$${name}_fib _env=\$${name}_env \
958 _prepend=\$${name}_prepend _login_class=\${${name}_login_class:-daemon} \
959 _limits=\$${name}_limits _oomprotect=\$${name}_oomprotect \
960 _env_file=\$${name}_env_file
962 if [ -n "$_env_file" ] && [ -r "${_env_file}" ]; then # load env from file
968 if [ -n "$_user" ]; then # unset $_user if running as that user
969 if [ "$_user" = "$(eval $IDCMD)" ]; then
974 [ -z "$autoboot" ] && eval $_pidcmd # determine the pid if necessary
976 for _elem in $_keywords; do
977 if [ "$_elem" != "$rc_arg" ]; then
980 # if ${rcvar} is set, $1 is not "rcvar" and not "describe"
981 # and ${rc_pid} is not set, then run
982 # checkyesno ${rcvar}
983 # and return if that failed
985 if [ -n "${rcvar}" -a "$rc_arg" != "rcvar" -a "$rc_arg" != "stop" \
986 -a "$rc_arg" != "describe" ] ||
987 [ -n "${rcvar}" -a "$rc_arg" = "stop" -a -z "${rc_pid}" ]; then
988 if ! checkyesno ${rcvar}; then
989 if [ -n "${rc_quiet}" ]; then
992 echo -n "Cannot '${rc_arg}' $name. Set ${rcvar} to "
993 echo -n "YES in /etc/rc.conf or use 'one${rc_arg}' "
994 echo "instead of '${rc_arg}'."
999 if [ $rc_arg = "start" -a -z "$rc_fast" -a -n "$rc_pid" ]; then
1000 if [ -z "$rc_quiet" ]; then
1001 echo 1>&2 "${name} already running? " \
1007 # if there's a custom ${XXX_cmd},
1008 # run that instead of the default
1010 eval _cmd=\$${rc_arg}_cmd \
1011 _precmd=\$${rc_arg}_precmd \
1012 _postcmd=\$${rc_arg}_postcmd
1014 if [ -n "$_cmd" ]; then
1015 _run_rc_precmd || return 1
1016 _run_rc_doit "$_cmd $rc_extra_args" || return 1
1021 case "$rc_arg" in # default operations...
1024 if [ -n "$desc" ]; then
1030 echo "$extra_commands"
1034 _run_rc_precmd || return 1
1035 if [ -n "$rc_pid" ]; then
1036 echo "${name} is running as pid $rc_pid."
1038 echo "${name} is not running."
1045 if [ ! -x "${_chroot}${_chroot:+/}${command}" ]; then
1046 warn "run_rc_command: cannot run $command"
1050 if ! _run_rc_precmd; then
1051 warn "failed precmd routine for ${name}"
1055 # setup the full command to run
1057 check_startmsgs && echo "Starting ${name}."
1058 if [ -n "$_chroot" ]; then
1061 ${_nice:+nice -n $_nice }\
1062 ${_fib:+setfib -F $_fib }\
1063 ${_env:+env $_env }\
1064 chroot ${_user:+-u $_user }${_group:+-g $_group }${_groups:+-G $_groups }\
1065 $_chroot $command $rc_flags $command_args"
1067 _cd="${_chdir:+cd $_chdir && }"
1069 ${_fib:+setfib -F $_fib }\
1070 ${_env:+env $_env }\
1071 $command $rc_flags $command_args"
1072 if [ -n "$_user" ]; then
1073 _doit="su -m $_user -c 'sh -c \"$_doit\"'"
1075 if [ -n "$_nice" ]; then
1076 if [ -z "$_user" ]; then
1077 _doit="sh -c \"$_doit\""
1079 _doit="nice -n $_nice $_doit"
1081 if [ -n "$_prepend" ]; then
1082 _doit="$_prepend $_doit"
1086 # Prepend default limits
1087 _doit="$_cd limits -C $_login_class $_limits $_doit"
1089 # run the full command
1091 if ! _run_rc_doit "$_doit"; then
1092 warn "failed to start ${name}"
1096 # finally, run postcmd
1102 if [ -z "$rc_pid" ]; then
1103 [ -n "$rc_fast" ] && return 0
1108 _run_rc_precmd || return 1
1110 # send the signal to stop
1112 echo "Stopping ${name}."
1113 _doit=$(_run_rc_killcmd "${sig_stop:-TERM}")
1114 _run_rc_doit "$_doit" || return 1
1116 # wait for the command to exit,
1118 wait_for_pids $rc_pid
1124 if [ -z "$rc_pid" ]; then
1129 _run_rc_precmd || return 1
1131 _doit=$(_run_rc_killcmd "${sig_reload:-HUP}")
1132 _run_rc_doit "$_doit" || return 1
1138 # prevent restart being called more
1139 # than once by any given script
1141 if ${_rc_restart_done:-false}; then
1144 _rc_restart_done=true
1146 _run_rc_precmd || return 1
1148 # run those in a subshell to keep global variables
1149 ( run_rc_command ${_rc_prefix}stop $rc_extra_args )
1150 ( run_rc_command ${_rc_prefix}start $rc_extra_args )
1152 [ $_return -ne 0 ] && [ -z "$rc_force" ] && return 1
1158 _run_rc_precmd || return 1
1159 if [ -n "$rc_pid" ]; then
1160 wait_for_pids $rc_pid
1167 if [ -n "$desc" ]; then
1173 # Get unique vars in $rcvar $rcvars
1174 for _v in $rcvar $rcvars; do
1176 $_v\ *|\ *$_v|*\ $_v\ *) ;;
1177 *) v="${v# } $_v" ;;
1181 # Display variables.
1183 if [ -z "$_v" ]; then
1187 eval _desc=\$${_v}_desc
1188 eval _defval=\$${_v}_defval
1191 eval echo \"$_v=\\\"\$$_v\\\"\"
1192 # decode multiple lines of _desc
1193 while [ -n "$_desc" ]; do
1196 echo "# $_h ${_desc%%^^*}"
1201 echo "# $_h ${_desc}"
1206 echo "# (default: \"$_defval\")"
1217 # Apply protect(1) to the PID if ${name}_oomprotect is set.
1220 # We cannot use protect(1) inside jails.
1221 if [ -n "$_oomprotect" ] && [ -f "${PROTECT}" ] &&
1222 [ "$(sysctl -n security.jail.jailed)" -eq 0 ]; then
1223 pid=$(check_process $command)
1224 case $_oomprotect in
1226 ${PROTECT} -i -p ${pid}
1229 ${PROTECT} -p ${pid}
1239 echo 1>&2 "$0: unknown directive '$rc_arg'."
1245 # Helper functions for run_rc_command: common code.
1246 # They use such global variables besides the exported rc_* ones:
1249 # ------------------
1256 check_required_before "$rc_arg" || return 1
1258 if [ -n "$_precmd" ]; then
1259 debug "run_rc_command: ${rc_arg}_precmd: $_precmd $rc_extra_args"
1260 eval "$_precmd $rc_extra_args"
1263 # If precmd failed and force isn't set, request exit.
1264 if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
1269 check_required_after "$rc_arg" || return 1
1276 if [ -n "$_postcmd" ]; then
1277 debug "run_rc_command: ${rc_arg}_postcmd: $_postcmd $rc_extra_args"
1278 eval "$_postcmd $rc_extra_args"
1286 debug "run_rc_command: doit: $*"
1290 # If command failed and force isn't set, request exit.
1291 if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
1298 _run_rc_notrunning()
1302 if [ -n "$pidfile" ]; then
1303 _pidmsg=" (check $pidfile)."
1307 echo 1>&2 "${name} not running?${_pidmsg}"
1314 _cmd="kill -$1 $rc_pid"
1315 if [ -n "$_user" ]; then
1316 _cmd="su -m ${_user} -c 'sh -c \"${_cmd}\"'"
1322 # run_rc_script file arg
1323 # Start the script `file' with `arg', and correctly handle the
1324 # return value from the script.
1325 # If `file' ends with `.sh' and lives in /etc/rc.d, ignore it as it's
1326 # an old-style startup file.
1327 # If `file' ends with `.sh' and does not live in /etc/rc.d, it's sourced
1328 # into the current environment if $rc_fast_and_loose is set; otherwise
1329 # it is run as a child process.
1330 # If `file' appears to be a backup or scratch file, ignore it.
1331 # Otherwise if it is executable run as a child process.
1337 if [ -z "$_file" -o -z "$_arg" ]; then
1338 err 3 'USAGE: run_rc_script file arg'
1341 unset name command command_args command_interpreter \
1342 extra_commands pidfile procname \
1343 rcvar rcvars rcvars_obsolete required_dirs required_files \
1345 eval unset ${_arg}_cmd ${_arg}_precmd ${_arg}_postcmd
1348 /etc/rc.d/*.sh) # no longer allowed in the base
1349 warn "Ignoring old-style startup script $_file"
1351 *[~#]|*.OLD|*.bak|*.orig|*,v) # scratch file; skip
1352 warn "Ignoring scratch file $_file"
1354 *) # run in subshell
1355 if [ -x $_file ]; then
1356 if [ -n "$rc_fast_and_loose" ]; then
1359 ( trap "echo Script $_file interrupted >&2 ; kill -QUIT $$" 3
1360 trap "echo Script $_file interrupted >&2 ; exit 1" 2
1361 trap "echo Script $_file running >&2" 29
1362 set $_arg; . $_file )
1370 # load_rc_config [service]
1371 # Source in the configuration file(s) for a given service.
1372 # If no service is specified, only the global configuration
1373 # file(s) will be loaded.
1377 local _name _rcvar_val _var _defval _v _msg _new _d
1380 if ${_rc_conf_loaded:-false}; then
1383 if [ -r /etc/defaults/rc.conf ]; then
1384 debug "Sourcing /etc/defaults/rc.conf"
1385 . /etc/defaults/rc.conf
1387 elif [ -r /etc/rc.conf ]; then
1388 debug "Sourcing /etc/rc.conf (/etc/defaults/rc.conf doesn't exist)."
1391 _rc_conf_loaded=true
1394 # If a service name was specified, attempt to load
1395 # service-specific configuration
1396 if [ -n "$_name" ] ; then
1397 for _d in /etc ${local_startup}; do
1399 if [ -f ${_d}/rc.conf.d/"$_name" ]; then
1400 debug "Sourcing ${_d}/rc.conf.d/$_name"
1401 . ${_d}/rc.conf.d/"$_name"
1402 elif [ -d ${_d}/rc.conf.d/"$_name" ] ; then
1404 for _rc in ${_d}/rc.conf.d/"$_name"/* ; do
1405 if [ -f "$_rc" ] ; then
1406 debug "Sourcing $_rc"
1414 # Set defaults if defined.
1415 for _var in $rcvar $rcvars; do
1416 eval _defval=\$${_var}_defval
1417 if [ -n "$_defval" ]; then
1418 eval : \${$_var:=\$${_var}_defval}
1422 # check obsolete rc.conf variables
1423 for _var in $rcvars_obsolete; do
1425 eval _msg=\$${_var}_obsolete_msg
1426 eval _new=\$${_var}_newvar
1431 if [ -z "$_new" ]; then
1434 eval $_new=\"\$$_var\"
1435 if [ -z "$_msg" ]; then
1436 _msg="Use \$$_new instead."
1439 warn "\$$_var is obsolete. $_msg"
1446 # load_rc_config_var name var
1447 # Read the rc.conf(5) var for name and set in the
1448 # current shell, using load_rc_config in a subshell to prevent
1449 # unwanted side effects from other variable assignments.
1451 load_rc_config_var()
1453 if [ $# -ne 2 ]; then
1454 err 3 'USAGE: load_rc_config_var name var'
1457 load_rc_config '$1' >/dev/null;
1458 if [ -n "${'$2'}" -o "${'$2'-UNSET}" != "UNSET" ]; then
1459 echo '$2'=\'\''${'$2'}\'\'';
1466 # Print a usage string for $0, with `commands' being a list of
1471 echo -n 1>&2 "Usage: $0 [fast|force|one|quiet]("
1475 echo -n 1>&2 "$_sep$_elem"
1483 # err exitval message
1484 # Display message to stderr and log to the syslog, and exit with exitval.
1491 if [ -x /usr/bin/logger ]; then
1492 logger "$0: ERROR: $*"
1494 echo 1>&2 "$0: ERROR: $*"
1500 # Display message to stderr and log to the syslog.
1504 if [ -x /usr/bin/logger ]; then
1505 logger "$0: WARNING: $*"
1507 echo 1>&2 "$0: WARNING: $*"
1512 # Display informational message to stdout and log to syslog.
1517 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
1518 if [ -x /usr/bin/logger ]; then
1519 logger "$0: INFO: $*"
1528 # If debugging is enabled in rc.conf output message to stderr.
1529 # BEWARE that you don't call any subroutine that itself calls this
1535 [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
1536 if [ -x /usr/bin/logger ]; then
1537 logger "$0: DEBUG: $*"
1539 echo 1>&2 "$0: DEBUG: $*"
1545 # backup_file action file cur backup
1546 # Make a backup copy of `file' into `cur', and save the previous
1547 # version of `cur' as `backup'.
1549 # The `action' keyword can be one of the following:
1551 # add `file' is now being backed up (and is possibly
1552 # being reentered into the backups system). `cur'
1555 # update `file' has changed and needs to be backed up.
1556 # If `cur' exists, it is copied to `back'
1557 # and then `file' is copied to `cur'.
1559 # remove `file' is no longer being tracked by the backups
1560 # system. `cur' is moved `back'.
1572 if [ -f $_cur ]; then
1576 chown root:wheel $_cur
1584 # make_symlink src link
1585 # Make a symbolic link 'link' to src from basedir. If the
1586 # directory in which link is to be created does not exist
1587 # a warning will be displayed and an error will be returned.
1588 # Returns 0 on success, 1 otherwise.
1592 local src link linkdir _me
1595 linkdir="`dirname $link`"
1596 _me="make_symlink()"
1598 if [ -z "$src" -o -z "$link" ]; then
1599 warn "$_me: requires two arguments."
1602 if [ ! -d "$linkdir" ]; then
1603 warn "$_me: the directory $linkdir does not exist."
1606 if ! ln -sf $src $link; then
1607 warn "$_me: unable to make a symbolic link from $link to $src"
1613 # devfs_rulesets_from_file file
1614 # Reads a set of devfs commands from file, and creates
1615 # the specified rulesets with their rules. Returns non-zero
1616 # if there was an error.
1618 devfs_rulesets_from_file()
1620 local file _err _me _opts
1622 _me="devfs_rulesets_from_file"
1625 if [ -z "$file" ]; then
1626 warn "$_me: you must specify a file"
1629 if [ ! -e "$file" ]; then
1630 debug "$_me: no such file ($file)"
1634 # Disable globbing so that the rule patterns are not expanded
1635 # by accident with matching filesystem entries.
1638 debug "reading rulesets from file ($file)"
1646 rulenum=`expr "$line" : "\[.*=\([0-9]*\)\]"`
1647 if [ -z "$rulenum" ]; then
1648 warn "$_me: cannot extract rule number ($line)"
1652 rulename=`expr "$line" : "\[\(.*\)=[0-9]*\]"`
1653 if [ -z "$rulename" ]; then
1654 warn "$_me: cannot extract rule name ($line)"
1658 eval $rulename=\$rulenum
1659 debug "found ruleset: $rulename=$rulenum"
1660 if ! /sbin/devfs rule -s $rulenum delset; then
1666 rulecmd="${line%%"\#*"}"
1667 # evaluate the command incase it includes
1669 if [ -n "$rulecmd" ]; then
1670 debug "adding rule ($rulecmd)"
1671 if ! eval /sbin/devfs rule -s $rulenum $rulecmd
1679 if [ $_err -ne 0 ]; then
1680 debug "error in $_me"
1684 case $_opts in *f*) ;; *) set +f ;; esac
1688 # devfs_init_rulesets
1689 # Initializes rulesets from configuration files. Returns
1690 # non-zero if there was an error.
1692 devfs_init_rulesets()
1695 _me="devfs_init_rulesets"
1697 # Go through this only once
1698 if [ -n "$devfs_rulesets_init" ]; then
1699 debug "$_me: devfs rulesets already initialized"
1702 for file in $devfs_rulesets; do
1703 if ! devfs_rulesets_from_file $file; then
1704 warn "$_me: could not read rules from $file"
1708 devfs_rulesets_init=1
1709 debug "$_me: devfs rulesets initialized"
1713 # devfs_set_ruleset ruleset [dir]
1714 # Sets the default ruleset of dir to ruleset. The ruleset argument
1715 # must be a ruleset name as specified in devfs.rules(5) file.
1716 # Returns non-zero if it could not set it successfully.
1721 [ -n "$1" ] && eval rs=\$$1 || rs=
1722 [ -n "$2" ] && devdir="-m "$2"" || devdir=
1723 _me="devfs_set_ruleset"
1725 if [ -z "$rs" ]; then
1726 warn "$_me: you must specify a ruleset number"
1729 debug "$_me: setting ruleset ($rs) on mount-point (${devdir#-m })"
1730 if ! /sbin/devfs $devdir ruleset $rs; then
1731 warn "$_me: unable to set ruleset $rs to ${devdir#-m }"
1737 # devfs_apply_ruleset ruleset [dir]
1738 # Apply ruleset number $ruleset to the devfs mountpoint $dir.
1739 # The ruleset argument must be a ruleset name as specified
1740 # in a devfs.rules(5) file. Returns 0 on success or non-zero
1741 # if it could not apply the ruleset.
1743 devfs_apply_ruleset()
1746 [ -n "$1" ] && eval rs=\$$1 || rs=
1747 [ -n "$2" ] && devdir="-m "$2"" || devdir=
1748 _me="devfs_apply_ruleset"
1750 if [ -z "$rs" ]; then
1751 warn "$_me: you must specify a ruleset"
1754 debug "$_me: applying ruleset ($rs) to mount-point (${devdir#-m })"
1755 if ! /sbin/devfs $devdir rule -s $rs applyset; then
1756 warn "$_me: unable to apply ruleset $rs to ${devdir#-m }"
1762 # devfs_domount dir [ruleset]
1763 # Mount devfs on dir. If ruleset is specified it is set
1764 # on the mount-point. It must also be a ruleset name as specified
1765 # in a devfs.rules(5) file. Returns 0 on success.
1771 [ -n "$2" ] && rs=$2 || rs=
1772 _me="devfs_domount()"
1774 if [ -z "$devdir" ]; then
1775 warn "$_me: you must specify a mount-point"
1778 debug "$_me: mount-point is ($devdir), ruleset is ($rs)"
1779 if ! mount -t devfs dev "$devdir"; then
1780 warn "$_me: Unable to mount devfs on $devdir"
1783 if [ -n "$rs" ]; then
1785 devfs_set_ruleset $rs $devdir
1786 devfs -m $devdir rule applyset
1791 # Provide a function for normalizing the mounting of memory
1792 # filesystems. This should allow the rest of the code here to remain
1793 # as close as possible between 5-current and 4-stable.
1796 # $3 = (optional) extra mdmfs flags
1799 if [ -n "$3" ]; then
1802 /sbin/mdmfs $flags -s $1 ${mfs_type} $2
1805 # Code common to scripts that need to load a kernel module
1806 # if it isn't in the kernel yet. Syntax:
1807 # load_kld [-e regex] [-m module] file
1808 # where -e or -m chooses the way to check if the module
1809 # is already loaded:
1810 # regex is egrep'd in the output from `kldstat -v',
1811 # module is passed to `kldstat -m'.
1812 # The default way is as though `-m file' were specified.
1815 local _loaded _mod _opt _re
1817 while getopts "e:m:" _opt; do
1820 m) _mod="$OPTARG" ;;
1821 *) err 3 'USAGE: load_kld [-e regex] [-m module] file' ;;
1824 shift $(($OPTIND - 1))
1825 if [ $# -ne 1 ]; then
1826 err 3 'USAGE: load_kld [-e regex] [-m module] file'
1830 if [ -n "$_re" ]; then
1831 if kldstat -v | egrep -q -e "$_re"; then
1835 if kldstat -q -m "$_mod"; then
1840 if ! kldload "$1"; then
1841 warn "Unable to load kernel module $1"
1844 info "$1 kernel module loaded."
1847 debug "load_kld: $1 kernel module already loaded."
1852 # ltr str src dst [var]
1853 # Change every $src in $str to $dst.
1854 # Useful when /usr is not yet mounted and we cannot use tr(1), sed(1) nor
1855 # awk(1). If var is non-NULL, set it to the result.
1858 local _str _src _dst _out _com _var
1866 for _com in ${_str}; do
1867 if [ -z "${_out}" ]; then
1870 _out="${_out}${_dst}${_com}"
1873 if [ -n "${_var}" ]; then
1874 setvar "${_var}" "${_out}"
1880 # Creates a list of providers for GELI encryption.
1883 local devices devices2
1884 local provider mountpoint type options rest
1886 # Create list of GELI providers from fstab.
1887 while read provider mountpoint type options rest ; do
1888 case ":${options}" in
1897 case ":${provider}" in
1902 # Skip swap devices.
1903 if [ "${type}" = "swap" -o "${options}" = "sw" -o "${noauto}" = "yes" ]; then
1906 devices="${devices} ${provider}"
1911 # Append providers from geli_devices.
1912 devices="${devices} ${geli_devices}"
1914 for provider in ${devices}; do
1915 provider=${provider%.eli}
1916 provider=${provider#/dev/}
1917 devices2="${devices2} ${provider}"
1923 # Originally, root mount hold had to be released before mounting
1924 # the root filesystem. This delayed the boot, so it was changed
1925 # to only wait if the root device isn't readily available. This
1926 # can result in rc scripts executing before all the devices - such
1927 # as graid(8), or USB disks - can be accessed. This function can
1928 # be used to explicitly wait for root mount holds to be released.
1931 local wait waited holders
1935 holders="$(sysctl -n vfs.root_mount_hold)"
1936 if [ -z "${holders}" ]; then
1939 if [ ${waited} -eq 0 ]; then
1940 echo -n "Waiting ${root_hold_delay}s" \
1941 "for the root mount holders: ${holders}"
1945 if [ ${waited} -ge ${root_hold_delay} ]; then
1950 waited=$(($waited + 1))
1954 # Find scripts in local_startup directories that use the old syntax
1956 find_local_scripts_old() {
1959 for dir in ${local_startup}; do
1960 if [ -d "${dir}" ]; then
1961 for file in ${dir}/[0-9]*.sh; do
1962 grep '^# PROVIDE:' $file >/dev/null 2>&1 &&
1964 zlist="$zlist $file"
1966 for file in ${dir}/[!0-9]*.sh; do
1967 grep '^# PROVIDE:' $file >/dev/null 2>&1 &&
1969 slist="$slist $file"
1975 find_local_scripts_new() {
1977 for dir in ${local_startup}; do
1978 if [ -d "${dir}" ]; then
1979 for file in `grep -l '^# PROVIDE:' ${dir}/* 2>/dev/null`; do
1982 *) if [ -x "$file" ]; then
1983 local_rc="${local_rc} ${file}"
1992 # check_required_{before|after} command
1993 # Check for things required by the command before and after its precmd,
1994 # respectively. The two separate functions are needed because some
1995 # conditions should prevent precmd from being run while other things
1996 # depend on precmd having already been run.
1998 check_required_before()
2004 for _f in $required_vars; do
2005 if ! checkyesno $_f; then
2006 warn "\$${_f} is not enabled."
2007 if [ -z "$rc_force" ]; then
2013 for _f in $required_dirs; do
2014 if [ ! -d "${_f}/." ]; then
2015 warn "${_f} is not a directory."
2016 if [ -z "$rc_force" ]; then
2022 for _f in $required_files; do
2023 if [ ! -r "${_f}" ]; then
2024 warn "${_f} is not readable."
2025 if [ -z "$rc_force" ]; then
2036 check_required_after()
2042 for _f in $required_modules; do
2044 *~*) _args="-e ${_f#*~} ${_f%%~*}" ;;
2045 *:*) _args="-m ${_f#*:} ${_f%%:*}" ;;
2048 if ! load_kld ${_args}; then
2049 if [ -z "$rc_force" ]; then
2061 # Return true if security.jail.$mib exists and set to 1.
2068 if _v=$(${SYSCTL_N} "security.jail.$_mib" 2> /dev/null); then
2076 # check_kern_features mib
2077 # Return existence of kern.features.* sysctl MIB as true or
2078 # false. The result will be cached in $_rc_cache_kern_features_
2079 # namespace. "0" means the kern.features.X exists.
2081 check_kern_features()
2085 [ -n "$1" ] || return 1;
2086 eval _v=\$_rc_cache_kern_features_$1
2087 [ -n "$_v" ] && return "$_v";
2089 if ${SYSCTL_N} kern.features.$1 > /dev/null 2>&1; then
2090 eval _rc_cache_kern_features_$1=0
2093 eval _rc_cache_kern_features_$1=1
2098 # check_namevarlist var
2099 # Return "0" if ${name}_var is reserved in rc.subr.
2101 _rc_namevarlist="program chroot chdir env flags fib nice user group groups prepend"
2106 for _v in $_rc_namevarlist; do
2115 # _echoonce var msg mode
2116 # mode=0: Echo $msg if ${$var} is empty.
2117 # After doing echo, a string is set to ${$var}.
2119 # mode=1: Echo $msg if ${$var} is a string with non-zero length.
2123 local _var _msg _mode
2129 1) [ -n "$_var" ] && echo "$_msg" ;;
2130 *) [ -z "$_var" ] && echo -n "$_msg" && eval "$1=finished" ;;
2134 # If the loader env variable rc.debug is set, turn on debugging. rc.conf will
2135 # still override this, but /etc/defaults/rc.conf can't unconditionally set this
2136 # since it would undo what we've done here.
2137 if kenv -q rc.debug > /dev/null ; then