[CFT] multiple instance support in rc.d script

Hiroki Sato hrs at FreeBSD.org
Fri Oct 17 03:08:38 UTC 2014


[Please reply to freebsd-rc@]

Hi,

 I would like your feedback and testers of the attached patch.  This
 implements multiple instance support in rc.d scripts.  You can try it
 by replacing /etc/rc.subr with the attached one.

 More details are as follow.  Typically, an rc.d/foo script has the
 following structure and rc.conf variables:

   /etc/rc.d/foo:
   ----
   name=foo
   rcvar=foo_enable
   ...
   load_rc_command $name
   run_rc_command $*
   ----

   /etc/rc.conf:
   ----
   foo_enable="YES"
   foo_flags="-f -l -a -g"
   ----

 The above supports one instance for one script.  After replacing
 rc.subr, you can specify additional instances in rc.conf:

   /etc/rc.conf:
   ----
   foo_instances="one two"

   foo_one_enable="YES"
   foo_one_flags="-f -l -a -g"

   foo_two_enable="YES"
   foo_two_flags="-F -L -A -G"
   ----

 $foo_instances defines instances by space-separated list of instance
 names, and rc.conf variables for them are something like
 ${name}_${instname}_enable.  The following command

  # service foo start

 starts foo_one and foo_two with the specified flags.  Instances can
 be specified in the following form:

  # service foo start:one

 or multiple instances in a particular order:

  # service foo start:two,one

 Basically, no change is required for the rc.d/foo script itself.
 However, there is a problem that default values of the instantiated
 variables are not defined.

 For example, if an rc.d/script uses $foo_mode, you need to define
 $foo_one_mode.  The default value of $foo_mode is usually defined in
 etc/defaults/rc.conf for rc.d scripts in the base system and ":
 ${foo_mode:=value}" idiom in scripts from Ports Collection.  So all
 of the variables should be defined for each instance, too.  As you
 noticed, this is not easy without editing the script itself.

 To alleviate this, set_rcvar() can be used:

   /etc/rc.d/foo:
   ----
   name=foo
   rcvar=foo_enable

   set_rcvar foo_enable		YES		"Enable $name"
   set_rcvar foo_program	"/tmp/test"	"Command for $name"
   ...
   load_rc_command $name
   run_rc_command $*
   ----

 The three arguments are varname, default value, and description.  If
 a variable is defined by set_rcvar(), default values instantiated
 variables will be set automatically---foo_one_program is set by
 foo_program if it is not defined.

 This approach still has another problem.  set_rcvar() is not
 supported in all branches, so a script using it does not work in old
 supported branches.  One solution which can be used for scripts in
 Ports Collection is adding both definitions before and after
 load_rc_command() until EoL of old branches like this:

   /etc/rc.d/foo:
   ----
   name=foo
   rcvar=foo_enable

   if type set_rcvar >/dev/null 2>&1; then
	set_rcvar foo_enable	YES		"Enable $name"
	set_rcvar foo_program	"/tmp/test"	"Command for $name"
   fi
   ...
   load_rc_command $name

   # will be removed after all supported branches have set_rcvar().
   if ! type set_rcvar >/dev/null 2>&1; then
	: ${foo_enable:="YES"}
	: ${foo_program:="/tmp/test"}
	for _i in $foo_instances; do
		for _j in enable program; do
			eval : \${foo_${_i}_enable:=\$foo_$_j}
		done
	done
   fi

   run_rc_command $*
   ----

 This is a bit ugly but should work fine.

 I am using this patch to invoke multiple named (caching
 server/contents server) and syslogd (local only/listens INET/INET6
 socket only) daemons.  While $foo_instances is designed as a
 user-defined knob, this can be applied to software which need to
 invoke multiple/different daemons which depend on each other in a
 script, too.

 I am feeling this patch still needs more careful review from others.
 Any comments are welcome.  Thank you.

-- Hiroki
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# $NetBSD: rc.subr,v 1.67 2006/10/07 11:25:15 elad Exp $
# $FreeBSD: head/etc/rc.subr 272976 2014-10-12 02:42:36Z hrs $
#
# Copyright (c) 1997-2004 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Luke Mewburn.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# rc.subr
#	functions used by various rc scripts
#

: ${RC_PID:=$$}; export RC_PID

#
#	Operating System dependent/independent variables
#

if [ -z "${_rc_subr_loaded}" ]; then

_rc_subr_loaded="YES"

SYSCTL="/sbin/sysctl"
SYSCTL_N="${SYSCTL} -n"
SYSCTL_W="${SYSCTL}"
ID="/usr/bin/id"
IDCMD="if [ -x $ID ]; then $ID -un; fi"
PS="/bin/ps -ww"
JID=`$PS -p $$ -o jid=`

#
#	functions
#	---------

# list_vars pattern
#	List vars matching pattern.
#
list_vars()
{
	set | { while read LINE; do
		var="${LINE%%=*}"
		case "$var" in
		"$LINE"|*[!a-zA-Z0-9_]*) continue ;;
		$1) echo $var
		esac
	done; }
}

# set_rcvar [var] [defval] [desc]
#
#	Echo or define a rc.conf(5) variable name.  Global variable
#	$rcvars is used.
#
#	If no argument is specified, echo "${name}_enable".
#
#	If only a var is specified, echo "${var}_enable".
#
#	If var and defval are specified, the ${var} is defined as
#	rc.conf(5) variable and the default value is ${defvar}.  An
#	optional argument $desc can also be specified to add a
#	description for that.
#
set_rcvar()
{
	local _var

	case $# in
	0)	echo ${name}_enable ;;
	1)	echo ${1}_enable ;;
	*)
		debug "set_rcvar: \$$1=$2 is added" \
		    " as a rc.conf(5) variable."
		_var=$1
		rcvars="${rcvars# } $_var"
		eval ${_var}_defval=\"$2\"
		shift 2
		eval ${_var}_desc=\"$*\"
	;;
	esac
}

# set_rcvar_obsolete oldvar [newvar] [msg]
#	Define obsolete variable.
#	Global variable $rcvars_obsolete is used.
#
set_rcvar_obsolete()
{
	local _var
	_var=$1
	debug "set_rcvar_obsolete: \$$1(old) -> \$$2(new) is defined"

	rcvars_obsolete="${rcvars_obsolete# } $1"
	eval ${1}_newvar=\"$2\"
	shift 2
	eval ${_var}_obsolete_msg=\"$*\"
}

#
# force_depend script [rcvar]
#	Force a service to start. Intended for use by services
#	to resolve dependency issues.
#	$1 - filename of script, in /etc/rc.d, to run
#	$2 - name of the script's rcvar (minus the _enable)
#
force_depend()
{
	local _depend _dep_rcvar

	_depend="$1"
	_dep_rcvar="${2:-$1}_enable"

	[ -n "$rc_fast" ] && ! checkyesno always_force_depends &&
	    checkyesno $_dep_rcvar && return 0

	/etc/rc.d/${_depend} forcestatus >/dev/null 2>&1 && return 0

	info "${name} depends on ${_depend}, which will be forced to start."
	if ! /etc/rc.d/${_depend} forcestart; then
		warn "Unable to force ${_depend}. It may already be running."
		return 1
	fi
}

#
# checkyesno var
#	Test $1 variable, and warn if not set to YES or NO.
#	Return 0 if it's "yes" (et al), nonzero otherwise.
#
checkyesno()
{
	eval _value=\$${1}
	debug "checkyesno: $1 is set to $_value."
	case $_value in

		#	"yes", "true", "on", or "1"
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		return 0
		;;

		#	"no", "false", "off", or "0"
	[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
		return 1
		;;
	*)
		warn "\$${1} is not set properly - see rc.conf(5)."
		return 1
		;;
	esac
}

#
# reverse_list list
#	print the list in reverse order
#
reverse_list()
{
	_revlist=
	for _revfile; do
		_revlist="$_revfile $_revlist"
	done
	echo $_revlist
}

# stop_boot always
#	If booting directly to multiuser or $always is enabled,
#	send SIGTERM to the parent (/etc/rc) to abort the boot.
#	Otherwise just exit.
#
stop_boot()
{
	local always

	case $1 in
		#	"yes", "true", "on", or "1"
        [Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		always=true
		;;
	*)
		always=false
		;;
	esac
	if [ "$autoboot" = yes -o "$always" = true ]; then
		echo "ERROR: ABORTING BOOT (sending SIGTERM to parent)!"
		kill -TERM ${RC_PID}
	fi
	exit 1
}

#
# mount_critical_filesystems type
#	Go through the list of critical filesystems as provided in
#	the rc.conf(5) variable $critical_filesystems_${type}, checking
#	each one to see if it is mounted, and if it is not, mounting it.
#
mount_critical_filesystems()
{
	eval _fslist=\$critical_filesystems_${1}
	for _fs in $_fslist; do
		mount | (
			_ismounted=false
			while read what _on on _type type; do
				if [ $on = $_fs ]; then
					_ismounted=true
				fi
			done
			if $_ismounted; then
				:
			else
				mount $_fs >/dev/null 2>&1
			fi
		)
	done
}

#
# check_pidfile pidfile procname [interpreter]
#	Parses the first line of pidfile for a PID, and ensures
#	that the process is running and matches procname.
#	Prints the matching PID upon success, nothing otherwise.
#	interpreter is optional; see _find_processes() for details.
#
check_pidfile()
{
	_pidfile=$1
	_procname=$2
	_interpreter=$3
	if [ -z "$_pidfile" -o -z "$_procname" ]; then
		err 3 'USAGE: check_pidfile pidfile procname [interpreter]'
	fi
	if [ ! -f $_pidfile ]; then
		debug "pid file ($_pidfile): not readable."
		return
	fi
	read _pid _junk < $_pidfile
	if [ -z "$_pid" ]; then
		debug "pid file ($_pidfile): no pid in file."
		return
	fi
	_find_processes $_procname ${_interpreter:-.} '-p '"$_pid"
}

#
# check_process procname [interpreter]
#	Ensures that a process (or processes) named procname is running.
#	Prints a list of matching PIDs.
#	interpreter is optional; see _find_processes() for details.
#
check_process()
{
	_procname=$1
	_interpreter=$2
	if [ -z "$_procname" ]; then
		err 3 'USAGE: check_process procname [interpreter]'
	fi
	_find_processes $_procname ${_interpreter:-.} '-ax'
}

#
# _find_processes procname interpreter psargs
#	Search for procname in the output of ps generated by psargs.
#	Prints the PIDs of any matching processes, space separated.
#
#	If interpreter == ".", check the following variations of procname
#	against the first word of each command:
#		procname
#		`basename procname`
#		`basename procname` + ":"
#		"(" + `basename procname` + ")"
#		"[" + `basename procname` + "]"
#
#	If interpreter != ".", read the first line of procname, remove the
#	leading #!, normalise whitespace, append procname, and attempt to
#	match that against each command, either as is, or with extra words
#	at the end.  As an alternative, to deal with interpreted daemons
#	using perl, the basename of the interpreter plus a colon is also
#	tried as the prefix to procname.
#
_find_processes()
{
	if [ $# -ne 3 ]; then
		err 3 'USAGE: _find_processes procname interpreter psargs'
	fi
	_procname=$1
	_interpreter=$2
	_psargs=$3

	_pref=
	if [ $_interpreter != "." ]; then	# an interpreted script
		_script="${_chroot}${_chroot:+/}$_procname"
		if [ -r "$_script" ]; then
			read _interp < $_script	# read interpreter name
			case "$_interp" in
			\#!*)
				_interp=${_interp#\#!}	# strip #!
				set -- $_interp
				case $1 in
				*/bin/env)
					shift	# drop env to get real name
					;;
				esac
				if [ $_interpreter != $1 ]; then
					warn "\$command_interpreter $_interpreter != $1"
				fi
				;;
			*)
				warn "no shebang line in $_script"
				set -- $_interpreter
				;;
			esac
		else
			warn "cannot read shebang line from $_script"
			set -- $_interpreter
		fi
		_interp="$* $_procname"		# cleanup spaces, add _procname
		_interpbn=${1##*/}
		_fp_args='_argv'
		_fp_match='case "$_argv" in
		    ${_interp}|"${_interp} "*|"[${_interpbn}]"|"${_interpbn}: ${_procname}"*)'
	else					# a normal daemon
		_procnamebn=${_procname##*/}
		_fp_args='_arg0 _argv'
		_fp_match='case "$_arg0" in
		    $_procname|$_procnamebn|${_procnamebn}:|"(${_procnamebn})"|"[${_procnamebn}]")'
	fi

	_proccheck="\
		$PS 2>/dev/null -o pid= -o jid= -o command= $_psargs"' |
		while read _npid _jid '"$_fp_args"'; do
			'"$_fp_match"'
				if [ "$JID" -eq "$_jid" ];
				then echo -n "$_pref$_npid";
				_pref=" ";
				fi
				;;
			esac
		done'

#	debug "in _find_processes: proccheck is ($_proccheck)."
	eval $_proccheck
}

# sort_lite [-b] [-n] [-k POS] [-t SEP]
#	A lite version of sort(1) (supporting a few options) that can be used
#	before the real sort(1) is available (e.g., in scripts that run prior
#	to mountcritremote). Requires only shell built-in functionality.
#
sort_lite()
{
	local funcname=sort_lite
	local sort_sep="$IFS" sort_ignore_leading_space=
	local sort_field=0 sort_strict_fields= sort_numeric=
	local nitems=0 skip_leading=0 trim=

	local OPTIND flag
	while getopts bnk:t: flag; do
		case "$flag" in
		b) sort_ignore_leading_space=1 ;;
		n) sort_numeric=1 sort_ignore_leading_space=1 ;;
		k) sort_field="${OPTARG%%,*}" ;; # only up to first comma
			# NB: Unlike sort(1) only one POS allowed
		t) sort_sep="$OPTARG"
		   if [ ${#sort_sep} -gt 1 ]; then
		   	echo "$funcname: multi-character tab \`$sort_sep'" >&2
		   	return 1
		   fi
		   sort_strict_fields=1
		   ;;
		\?) return 1 ;;
		esac
	done
	shift $(( $OPTIND - 1 ))

	# Create transformation pattern to trim leading text if desired
	case "$sort_field" in
	""|[!0-9]*|*[!0-9.]*)
		echo "$funcname: invalid sort field \`$sort_field'" >&2
		return 1
		;;
	*.*)
		skip_leading=${sort_field#*.} sort_field=${sort_field%%.*}
		while [ ${skip_leading:-0} -gt 1 ] 2> /dev/null; do
			trim="$trim?" skip_leading=$(( $skip_leading - 1 ))
		done
	esac

	# Copy input to series of local numbered variables
	# NB: IFS of NULL preserves leading whitespace
	local LINE
	while IFS= read -r LINE || [ "$LINE" ]; do
		nitems=$(( $nitems + 1 ))
		local src_$nitems="$LINE"
	done

	#
	# Sort numbered locals using insertion sort
	#
	local curitem curitem_orig curitem_mod curitem_haskey
	local dest dest_orig dest_mod dest_haskey
	local d gt n
	local i=1
	while [ $i -le $nitems ]; do
		curitem_haskey=1 # Assume sort field (-k POS) exists
		eval curitem=\"\$src_$i\"
		curitem_mod="$curitem" # for modified comparison
		curitem_orig="$curitem" # for original comparison

		# Trim leading whitespace if desired
		if [ "$sort_ignore_leading_space" ]; then
			while case "$curitem_orig" in
				[$IFS]*) : ;; *) false; esac
			do
				curitem_orig="${curitem_orig#?}"
			done
			curitem_mod="$curitem_orig"
		fi

		# Shift modified comparison value if sort field (-k POS) is > 1
		n=$sort_field
		while [ $n -gt 1 ]; do
			case "$curitem_mod" in
			*[$sort_sep]*)
				# Cut text up-to (and incl.) first separator
				curitem_mod="${curitem_mod#*[$sort_sep]}"

				# Skip NULLs unless strict field splitting
				[ "$sort_strict_fields" ] ||
					[ "${curitem_mod%%[$sort_sep]*}" ] ||
					[ $n -eq 2 ] ||
					continue
				;;
			*)
				# Asked for a field that doesn't exist
				curitem_haskey= break
			esac
			n=$(( $n - 1 ))
		done

		# Trim trailing words if sort field >= 1
		[ $sort_field -ge 1 -a "$sort_numeric" ] &&
			curitem_mod="${curitem_mod%%[$sort_sep]*}"

		# Apply optional trim (-k POS.TRIM) to cut leading characters
		curitem_mod="${curitem_mod#$trim}"

		# Determine the type of modified comparison to use initially
		# NB: Prefer numerical if requested but fallback to standard
		case "$curitem_mod" in
		""|[!0-9]*) # NULL or begins with non-number
			gt=">"
			[ "$sort_numeric" ] && curitem_mod=0
			;;
		*)
			if [ "$sort_numeric" ]; then
				gt="-gt"
				curitem_mod="${curitem_mod%%[!0-9]*}"
					# NB: trailing non-digits removed
					# otherwise numeric comparison fails
			else
				gt=">"
			fi
		esac

		# If first time through, short-circuit below position-search
		if [ $i -le 1 ]; then
			d=0
		else
			d=1
		fi

		#
		# Find appropriate element position
		#
		while [ $d -gt 0 ]
		do
			dest_haskey=$curitem_haskey
			eval dest=\"\$dest_$d\"
			dest_mod="$dest" # for modified comparison
			dest_orig="$dest" # for original comparison

			# Trim leading whitespace if desired
			if [ "$sort_ignore_leading_space" ]; then
				while case "$dest_orig" in
					[$IFS]*) : ;; *) false; esac
				do
					dest_orig="${dest_orig#?}"
				done
				dest_mod="$dest_orig"
			fi

			# Shift modified value if sort field (-k POS) is > 1
			n=$sort_field
			while [ $n -gt 1 ]; do
				case "$dest_mod" in
				*[$sort_sep]*)
					# Cut text up-to (and incl.) 1st sep
					dest_mod="${dest_mod#*[$sort_sep]}"

					# Skip NULLs unless strict fields
					[ "$sort_strict_fields" ] ||
					    [ "${dest_mod%%[$sort_sep]*}" ] ||
					    [ $n -eq 2 ] ||
					    continue
					;;
				*)
					# Asked for a field that doesn't exist
					dest_haskey= break
				esac
				n=$(( $n - 1 ))
			done

			# Trim trailing words if sort field >= 1
			[ $sort_field -ge 1 -a "$sort_numeric" ] &&
				dest_mod="${dest_mod%%[$sort_sep]*}"

			# Apply optional trim (-k POS.TRIM), cut leading chars
			dest_mod="${dest_mod#$trim}"

			# Determine type of modified comparison to use
			# NB: Prefer numerical if requested, fallback to std
			case "$dest_mod" in
			""|[!0-9]*) # NULL or begins with non-number
				gt=">"
				[ "$sort_numeric" ] && dest_mod=0
				;;
			*)
				if [ "$sort_numeric" ]; then
					gt="-gt"
					dest_mod="${dest_mod%%[!0-9]*}"
						# NB: kill trailing non-digits
						# for numeric comparison safety
				else
					gt=">"
				fi
			esac

			# Break if we've found the proper element position
			if [ "$curitem_haskey" -a "$dest_haskey" ]; then
				if [ "$dest_mod" = "$curitem_mod" ]; then
					[ "$dest_orig" ">" "$curitem_orig" ] &&
						break
				elif [ "$dest_mod" $gt "$curitem_mod" ] \
					2> /dev/null
				then
					break
				fi
			else
				[ "$dest_orig" ">" "$curitem_orig" ] && break
			fi

			# Break if we've hit the end
			[ $d -ge $i ] && break

			d=$(( $d + 1 ))
		done

		# Shift remaining positions forward, making room for new item
		n=$i
		while [ $n -ge $d ]; do
			# Shift destination item forward one placement
			eval dest_$(( $n + 1 ))=\"\$dest_$n\"
			n=$(( $n - 1 ))
		done

		# Place the element
		if [ $i -eq 1 ]; then
			local dest_1="$curitem"
		else
			local dest_$d="$curitem"
		fi

		i=$(( $i + 1 ))
	done

	# Print sorted results
	d=1
	while [ $d -le $nitems ]; do
		eval echo \"\$dest_$d\"
		d=$(( $d + 1 ))
	done
}

#
# wait_for_pids pid [pid ...]
#	spins until none of the pids exist
#
wait_for_pids()
{
	local _list _prefix _nlist _j

	_list="$@"
	if [ -z "$_list" ]; then
		return
	fi
	_prefix=
	while true; do
		_nlist="";
		for _j in $_list; do
			if kill -0 $_j 2>/dev/null; then
				_nlist="${_nlist}${_nlist:+ }$_j"
				[ -n "$_prefix" ] && sleep 1
			fi
		done
		if [ -z "$_nlist" ]; then
			break
		fi
		_list=$_nlist
		echo -n ${_prefix:-"Waiting for PIDS: "}$_list
		_prefix=", "
		pwait $_list 2>/dev/null
	done
	if [ -n "$_prefix" ]; then
		echo "."
	fi
}

#
# get_pidfile_from_conf string file
#
#	Takes a string to search for in the specified file.
#	Ignores lines with traditional comment characters.
#
# Example:
#
# if get_pidfile_from_conf string file; then
#	pidfile="$_pidfile_from_conf"
# else
#	pidfile='appropriate default'
# fi
#
get_pidfile_from_conf()
{
	if [ -z "$1" -o -z "$2" ]; then
		err 3 "USAGE: get_pidfile_from_conf string file ($name)"
	fi

	local string file line

	string="$1" ; file="$2"

	if [ ! -s "$file" ]; then
		err 3 "get_pidfile_from_conf: $file does not exist ($name)"
	fi

	while read line; do
		case "$line" in
		*[#\;]*${string}*)	continue ;;
		*${string}*)		break ;;
		esac
	done < $file

	if [ -n "$line" ]; then
		line=${line#*/}
		_pidfile_from_conf="/${line%%[\"\;]*}"
	else
		return 1
	fi
}

#
# check_startmsgs
#	If rc_quiet is set (usually as a result of using faststart at
#	boot time) check if rc_startmsgs is enabled.
#
check_startmsgs()
{
	if [ -n "$rc_quiet" ]; then
		checkyesno rc_startmsgs
	else
		return 0
	fi
}

#
# run_rc_command argument
#	Search for argument in the list of supported commands, which is:
#		"start stop restart rcvar status poll ${extra_commands}"
#	If there's a match, run ${argument}_cmd or the default method
#	(see below).
#	_run_rc_command0() is the main routine and run_rc_command() is
#	a wrapper to handle multiple instances.
#
#
#	If argument has a given prefix, then change the operation as follows:
#		Prefix	Operation
#		------	---------
#		fast	Skip the pid check, and set rc_fast=yes, rc_quiet=yes
#		force	Set ${rcvar} to YES, and set rc_force=yes
#		one	Set ${rcvar} to YES
#		quiet	Don't output some diagnostics, and set rc_quiet=yes
#
#	The following globals are used:
#
#	Name		Needed	Purpose
#	----		------	-------
#	name		y	Name of script.
#
#	command		n	Full path to command.
#				Not needed if ${rc_arg}_cmd is set for
#				each keyword.
#
#	command_args	n	Optional args/shell directives for command.
#
#	command_interpreter n	If not empty, command is interpreted, so
#				call check_{pidfile,process}() appropriately.
#
#	desc		n	Description of script.
#
#	extra_commands	n	List of extra commands supported.
#
#	pidfile		n	If set, use check_pidfile $pidfile $command,
#				otherwise use check_process $command.
#				In either case, only check if $command is set.
#
#	procname	n	Process name to check for instead of $command.
#
#	rcvar		n	This is checked with checkyesno to determine
#				if the action should be run.
#
#	${name}_program	n	Full path to command.
#				Meant to be used in /etc/rc.conf to override
#				${command}.
#
#	${name}_chroot	n	Directory to chroot to before running ${command}
#				Requires /usr to be mounted.
#
#	${name}_chdir	n	Directory to cd to before running ${command}
#				(if not using ${name}_chroot).
#
#	${name}_flags	n	Arguments to call ${command} with.
#				NOTE:	$flags from the parent environment
#					can be used to override this.
#
#	${name}_env	n	Environment variables to run ${command} with.
#
#	${name}_fib	n	Routing table number to run ${command} with.
#
#	${name}_nice	n	Nice level to run ${command} at.
#
#	${name}_pidfile	n	This to be used in /etc/rc.conf to override
#				${pidfile}.
#
#	${name}_user	n	User to run ${command} as, using su(1) if not
#				using ${name}_chroot.
#				Requires /usr to be mounted.
#
#	${name}_group	n	Group to run chrooted ${command} as.
#				Requires /usr to be mounted.
#
#	${name}_groups	n	Comma separated list of supplementary groups
#				to run the chrooted ${command} with.
#				Requires /usr to be mounted.
#
#	${name}_prepend	n	Command added before ${command}.
#
#	${rc_arg}_cmd	n	If set, use this as the method when invoked;
#				Otherwise, use default command (see below)
#
#	${rc_arg}_precmd n	If set, run just before performing the
#				${rc_arg}_cmd method in the default
#				operation (i.e, after checking for required
#				bits and process (non)existence).
#				If this completes with a non-zero exit code,
#				don't run ${rc_arg}_cmd.
#
#	${rc_arg}_postcmd n	If set, run just after performing the
#				${rc_arg}_cmd method, if that method
#				returned a zero exit code.
#
#	required_dirs	n	If set, check for the existence of the given
#				directories before running a (re)start command.
#
#	required_files	n	If set, check for the readability of the given
#				files before running a (re)start command.
#
#	required_modules n	If set, ensure the given kernel modules are
#				loaded before running a (re)start command.
#				The check and possible loads are actually
#				done after start_precmd so that the modules
#				aren't loaded in vain, should the precmd
#				return a non-zero status to indicate a error.
#				If a word in the list looks like "foo:bar",
#				"foo" is the KLD file name and "bar" is the
#				module name.  If a word looks like "foo~bar",
#				"foo" is the KLD file name and "bar" is a
#				egrep(1) pattern matching the module name.
#				Otherwise the module name is assumed to be
#				the same as the KLD file name, which is most
#				common.  See load_kld().
#
#	required_vars	n	If set, perform checkyesno on each of the
#				listed variables before running the default
#				(re)start command.
#
#	Default behaviour for a given argument, if no override method is
#	provided:
#
#	Argument	Default behaviour
#	--------	-----------------
#	start		if !running && checkyesno ${rcvar}
#				${command}
#
#	stop		if ${pidfile}
#				rc_pid=$(check_pidfile $pidfile $command)
#			else
#				rc_pid=$(check_process $command)
#			kill $sig_stop $rc_pid
#			wait_for_pids $rc_pid
#			($sig_stop defaults to TERM.)
#
#	reload		Similar to stop, except use $sig_reload instead,
#			and doesn't wait_for_pids.
#			$sig_reload defaults to HUP.
#			Note that `reload' isn't provided by default,
#			it should be enabled via $extra_commands.
#
#	restart		Run `stop' then `start'.
#
#	status		Show if ${command} is running, etc.
#
#	poll		Wait for ${command} to exit.
#
#	rcvar		Display what rc.conf variable is used (if any).
#
#	enabled		Return true if the service is enabled.
#
#	Variables available to methods, and after run_rc_command() has
#	completed:
#
#	Variable	Purpose
#	--------	-------
#	rc_arg		Argument to command, after fast/force/one processing
#			performed
#
#	rc_flags	Flags to start the default command with.
#			Defaults to ${name}_flags, unless overridden
#			by $flags from the environment.
#			This variable may be changed by the precmd method.
#
#	rc_pid		PID of command (if appropriate)
#
#	rc_fast		Not empty if "fast" was provided (q.v.)
#
#	rc_force	Not empty if "force" was provided (q.v.)
#
#	rc_quiet	Not empty if "quiet" was provided
#
#
run_rc_command()
{
	local _act _instances _name _desc _rcvar

	_act=$1
	shift
	eval _instances=\$${name}_instances

	# Check if instance is specified, e.g. "start:instance,...".
	case ${_act%:*} in
	$_act)	;;			# no instance specified
	*)
		_instances=$(echo ${_act#*:} | tr "," " ")
		_act=${_act%:*}
	;;
	esac

	# Use reverse order for stop.
	case $_act in
	*stop)	_instances=$(reverse_list $_instances) ;;
	esac

	case $_instances in
	"")
		_name=$name
		_inst=
		_run_rc_command0 $_act "$@"
	;;
	*)
		_name=$name
		_desc=$desc
		_rcvar=$rcvar
		for _inst in $_instances; do
			# Use a subshell to preserve variables.
			(
			name=${_name}_$_inst
			eval desc=\"$_desc\${${name}_desc+:\ }\$${name}_desc\"
			rcvar=${_rcvar%_enable}_${_inst}_enable
			_run_rc_command0 $_act "$@"
			)
		done
	;;
	esac
}

getnameparam()
{

	eval echo \${$1_$_inst${_inst:+_}$2-\$$1_$2}
}

_run_rc_command0()
{
	_return=0
	rc_arg=$1
	if [ -z "$name" ]; then
		err 3 'run_rc_command: $name is not set.'
	fi

	# Don't repeat the first argument when passing additional command-
	# line arguments to the command subroutines.
	#
	shift 1
	rc_extra_args="$*"

	_rc_prefix=
	case "$rc_arg" in
	fast*)				# "fast" prefix; don't check pid
		rc_arg=${rc_arg#fast}
		rc_fast=yes
		rc_quiet=yes
		;;
	force*)				# "force" prefix; always run
		rc_force=yes
		_rc_prefix=force
		rc_arg=${rc_arg#${_rc_prefix}}
		if [ -n "${rcvar}" ]; then
			eval ${rcvar}=YES
		fi
		;;
	one*)				# "one" prefix; set ${rcvar}=yes
		_rc_prefix=one
		rc_arg=${rc_arg#${_rc_prefix}}
		if [ -n "${rcvar}" ]; then
			eval ${rcvar}=YES
		fi
		;;
	quiet*)				# "quiet" prefix; omit some messages
		_rc_prefix=quiet
		rc_arg=${rc_arg#${_rc_prefix}}
		rc_quiet=yes
		;;
	esac

	if [ -z "$command" ]; then
		command=$(getnameparam $_name program)
	fi
	if [ -z "$pidfile" ]; then
		pidfile=$(getnameparam $_name pidfile)
	fi

	_keywords="start stop restart rcvar enabled $extra_commands"
	rc_pid=
	_pidcmd=
	_procname=${procname:-${command}}

					# setup pid check command
	if [ -n "$_procname" ]; then
		if [ -n "$pidfile" ]; then
			_pidcmd='rc_pid=$(check_pidfile '"$pidfile $_procname $command_interpreter"')'
		else
			_pidcmd='rc_pid=$(check_process '"$_procname $command_interpreter"')'
		fi
		if [ -n "$_pidcmd" ]; then
			_keywords="${_keywords} status poll"
		fi
	fi

	if [ -z "$rc_arg" ]; then
		rc_usage $_keywords
	fi

	if [ "$rc_arg" = "enabled" ] ; then
		checkyesno ${rcvar}
		return $?
	fi

	if [ -n "$flags" ]; then	# allow override from environment
		rc_flags=$flags
	else
		rc_flags=$(getnameparam $_name flags)
	fi
	_chdir=$(getnameparam $_name chdir)
	_chroot=$(getnameparam $_name chroot)
	_nice=$(getnameparam $_name nice)
	_user=$(getnameparam $_name user)
	_group=$(getnameparam $_name group)
	_groups=$(getnameparam $_name groups)
	_env=$(getnameparam $_name env)
	_prepend=$(getnameparam $_name prepend)

	if [ -n "$_user" ]; then	# unset $_user if running as that user
		if [ "$_user" = "$(eval $IDCMD)" ]; then
			unset _user
		fi
	fi

	[ -z "$autoboot" ] && eval $_pidcmd	# determine the pid if necessary

	for _elem in $_keywords; do
		if [ "$_elem" != "$rc_arg" ]; then
			continue
		fi
					# if ${rcvar} is set, $1 is not "rcvar"
					# and ${rc_pid} is not set, then run
					#	checkyesno ${rcvar}
					# and return if that failed
					#
		if [ -n "${rcvar}" -a "$rc_arg" != "rcvar" -a "$rc_arg" != "stop" ] ||
		    [ -n "${rcvar}" -a "$rc_arg" = "stop" -a -z "${rc_pid}" ]; then
			if ! checkyesno ${rcvar}; then
				if [ -n "${rc_quiet}" ]; then
					return 0
				fi
				echo -n "Cannot '${rc_arg}' $name. Set ${rcvar} to "
				echo -n "YES in /etc/rc.conf or use 'one${rc_arg}' "
				echo "instead of '${rc_arg}'."
				return 0
			fi
		fi

					# if there's a custom ${XXX_cmd},
					# run that instead of the default
					#
		_cmd=$(getnameparam $rc_arg cmd)
		_precmd=$(getnameparam $rc_arg precmd)
		_postcmd=$(getnameparam $rc_arg postcmd)

		if [ -n "$_cmd" ]; then
			_run_rc_precmd || return 1
			_run_rc_doit "$_cmd $rc_extra_args" || return 1
			_run_rc_postcmd
			return $_return
		fi

		case "$rc_arg" in	# default operations...

		status)
			_run_rc_precmd || return 1
			if [ -n "$rc_pid" ]; then
				echo "${name} is running as pid $rc_pid."
			else
				echo "${name} is not running."
				return 1
			fi
			_run_rc_postcmd
			;;

		start)
			if [ -z "$rc_fast" -a -n "$rc_pid" ]; then
				if [ -z "$rc_quiet" ]; then
					echo 1>&2 "${name} already running? " \
					    "(pid=$rc_pid)."
				fi
				return 1
			fi

			if [ ! -x "${_chroot}${_chroot:+/}${command}" ]; then
				warn "run_rc_command: cannot run $command"
				return 1
			fi

			if ! _run_rc_precmd; then
				warn "failed precmd routine for ${name}"
				return 1
			fi

					# setup the full command to run
					#
			check_startmsgs && echo "Starting ${name}."
			if [ -n "$_chroot" ]; then
				_doit="\
${_nice:+nice -n $_nice }\
${_fib:+setfib -F $_fib }\
${_env:+env $_env }\
chroot ${_user:+-u $_user }${_group:+-g $_group }${_groups:+-G $_groups }\
$_chroot $command $rc_flags $command_args"
			else
				_doit="\
${_chdir:+cd $_chdir && }\
${_fib:+setfib -F $_fib }\
${_env:+env $_env }\
$command $rc_flags $command_args"
				if [ -n "$_user" ]; then
				    _doit="su -m $_user -c 'sh -c \"$_doit\"'"
				fi
				if [ -n "$_nice" ]; then
					if [ -z "$_user" ]; then
						_doit="sh -c \"$_doit\""
					fi
					_doit="nice -n $_nice $_doit"
				fi
				if [ -n "$_prepend" ]; then
					_doit="$_prepend $_doit"
				fi
			fi

					# run the full command
					#
			if ! _run_rc_doit "$_doit"; then
				warn "failed to start ${name}"
				return 1
			fi

					# finally, run postcmd
					#
			_run_rc_postcmd
			;;

		stop)
			if [ -z "$rc_pid" ]; then
				[ -n "$rc_fast" ] && return 0
				_run_rc_notrunning
				return 1
			fi

			_run_rc_precmd || return 1

					# send the signal to stop
					#
			echo "Stopping ${name}."
			_doit=$(_run_rc_killcmd "${sig_stop:-TERM}")
			_run_rc_doit "$_doit" || return 1

					# wait for the command to exit,
					# and run postcmd.
			wait_for_pids $rc_pid

			_run_rc_postcmd
			;;

		reload)
			if [ -z "$rc_pid" ]; then
				_run_rc_notrunning
				return 1
			fi

			_run_rc_precmd || return 1

			_doit=$(_run_rc_killcmd "${sig_reload:-HUP}")
			_run_rc_doit "$_doit" || return 1

			_run_rc_postcmd
			;;

		restart)
					# prevent restart being called more
					# than once by any given script
					#
			if ${_rc_restart_done:-false}; then
				return 0
			fi
			_rc_restart_done=true

			_run_rc_precmd || return 1

			# run those in a subshell to keep global variables
			( run_rc_command ${_rc_prefix}stop $rc_extra_args )
			( run_rc_command ${_rc_prefix}start $rc_extra_args )
			_return=$?
			[ $_return -ne 0 ] && [ -z "$rc_force" ] && return 1

			_run_rc_postcmd
			;;

		poll)
			_run_rc_precmd || return 1
			if [ -n "$rc_pid" ]; then
				wait_for_pids $rc_pid
			fi
			_run_rc_postcmd
			;;

		rcvar)
			echo -n "# $name"
			if [ -n "$desc" ]; then
				echo " : $desc"
			else
				echo ""
			fi
			echo "#"

			# Display variables.
			for _v in $(getinstlist $_name "$_inst" $rcvar $rcvars);
			do
				if [ -z "$_v" ]; then
					continue
				fi

				eval _desc=\$${_v}_desc
				eval _defval=\$${_v}_defval
				eval _val=\$$_v

				case $_defval in
				$_val)
					_e=
					_m=
				;;
				*)
					_e="	# (default: \"$_defval\")"
					_m="(*)"
				;;
				esac
				echo "# $_v$_m${_desc+: }$_desc"
				eval echo \"$_v=\\\"\$$_v\\\"\" \$_e
			done
			echo ""
			;;

		*)
			rc_usage $_keywords
			;;

		esac
		return $_return
	done

	echo 1>&2 "$0: unknown directive '$rc_arg'."
	rc_usage $_keywords
	# not reached
}

#
# Helper functions for run_rc_command: common code.
# They use such global variables besides the exported rc_* ones:
#
#	name	       R/W
#	------------------
#	_precmd		R
#	_postcmd	R
#	_return		W
#
_run_rc_precmd()
{
	check_required_before "$rc_arg" || return 1

	if [ -n "$_precmd" ]; then
		debug "run_rc_command: ${rc_arg}_precmd: $_precmd $rc_extra_args"
		eval "$_precmd $rc_extra_args"
		_return=$?

		# If precmd failed and force isn't set, request exit.
		if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
			return 1
		fi
	fi

	check_required_after "$rc_arg" || return 1

	return 0
}

_run_rc_postcmd()
{
	if [ -n "$_postcmd" ]; then
		debug "run_rc_command: ${rc_arg}_postcmd: $_postcmd $rc_extra_args"
		eval "$_postcmd $rc_extra_args"
		_return=$?
	fi
	return 0
}

_run_rc_doit()
{
	debug "run_rc_command: doit: $*"
	eval "$@"
	_return=$?

	# If command failed and force isn't set, request exit.
	if [ $_return -ne 0 ] && [ -z "$rc_force" ]; then
		return 1
	fi

	return 0
}

_run_rc_notrunning()
{
	local _pidmsg

	if [ -n "$pidfile" ]; then
		_pidmsg=" (check $pidfile)."
	else
		_pidmsg=
	fi
	echo 1>&2 "${name} not running?${_pidmsg}"
}

_run_rc_killcmd()
{
	local _cmd

	_cmd="kill -$1 $rc_pid"
	if [ -n "$_user" ]; then
		_cmd="su -m ${_user} -c 'sh -c \"${_cmd}\"'"
	fi
	echo "$_cmd"
}

#
# run_rc_script file arg
#	Start the script `file' with `arg', and correctly handle the
#	return value from the script.
#	If `file' ends with `.sh', it's sourced into the current environment
#	when $rc_fast_and_loose is set, otherwise it is run as a child process.
#	If `file' appears to be a backup or scratch file, ignore it.
#	Otherwise if it is executable run as a child process.
#
run_rc_script()
{
	_file=$1
	_arg=$2
	if [ -z "$_file" -o -z "$_arg" ]; then
		err 3 'USAGE: run_rc_script file arg'
	fi

	unset	name command command_args command_interpreter \
		extra_commands pidfile procname \
		rcvar rcvars rcvars_obsolete required_dirs required_files \
		required_vars
	eval unset ${_arg}_cmd ${_arg}_precmd ${_arg}_postcmd

	case "$_file" in
	/etc/rc.d/*.sh)			# no longer allowed in the base
		warn "Ignoring old-style startup script $_file"
		;;
	*[~#]|*.OLD|*.bak|*.orig|*,v)	# scratch file; skip
		warn "Ignoring scratch file $_file"
		;;
	*)				# run in subshell
		if [ -x $_file ]; then
			if [ -n "$rc_fast_and_loose" ]; then
				set $_arg; . $_file
			else
				( trap "echo Script $_file interrupted >&2 ; kill -QUIT $$" 3
				  trap "echo Script $_file interrupted >&2 ; exit 1" 2
				  trap "echo Script $_file running >&2" 29
				  set $_arg; . $_file )
			fi
		fi
		;;
	esac
}

#
# uniqlist var list
#	Put a list into $var with duplicate words removed.
#
uniqlist()
{
	local _uv _v

	_uv=
	for _v in "$@"; do
		case $_uv in
		$_v|$_v\ *|*\ $_v|*\ $_v\ *) ;;
		*)	_uv="${_uv# }${_uv:+ }$_v" ;;
		esac
	done
	echo "$_uv"
}
#
# createinstlist() name inst list
#	Generate a variable list with the instance name.
#
createinstlist()
{
	local _name _inst _v

	_name=$1
	_inst=$2
	shift 2
	for _v in $(uniqlist "$@"); do
		echo "${_name}_${_inst}${_inst+_}${_v#${_name}_}"
	done
}
#
# getinstlist() name inst list
#	Get a variable list only with the instance name.
#
getinstlist()
{
	local _name _inst _v _l

	_name=$1
	_inst=$2
	shift 2
	_l=
	for _v in $(uniqlist "$@"); do
		case $_v in
		${_name}${_inst:+_}${_inst}_*)	_l="${_l# }${_l:+ }$_v" ;;
		esac
	done
	uniqlist $_l
}

#
# load_rc_config name
#	Source in the configuration file for a given name.
#	load_rc_config0() is the main routine and load_rc_config() is
#	a wrapper to handle multiple instances.
#
load_rc_config()
{
	local _instances _inst _name _rcvars _defval _desc _k _v _ul

	# XXX: normalization
	ltr "$name" "-" "_" name
	ltr "$1"    "-" "_" _name
	_load_rc_config0 $_name

	eval _instances=\$${_name}_instances
	_rcvars=$rcvars

	for _inst in $_instances; do
		# Set default values for ${_name}_$_inst.

		for _k in $(uniqlist $_rcvars); do
			# _k includes _name
			eval _defval=\${${_k}_defval}
			eval _desc=\${${_k}_desc}
			set_rcvar $(createinstlist $_name $_inst $_k) \
			    "$_defval" "$_desc"
		done
		for _k in $_rc_namevarlist; do
			if [ "$_k" = "instances" ]; then
				continue
			fi
			_k=${_name}_$_k
			# _k includes _name
			eval _defval=\${${_k}_defval}
			eval _desc=\${${_k}_desc}
			if [ -n "$_defval" ]; then
				set_rcvar $(createinstlist $_name $_inst $_k) \
				    "$_defval" "$_desc"
			fi
		done
		_load_rc_config0 ${_name}_$_inst
	done
}

_load_rc_config0()
{
	local _name _rcvar_val _var _defval _v _msg _new _d
	_name=$1
	if [ -z "$_name" ]; then
		err 3 'USAGE: load_rc_config name'
	fi

	if ${_rc_conf_loaded:-false}; then
		:
	else
		if [ -r /etc/defaults/rc.conf ]; then
			debug "Sourcing /etc/defaults/rc.conf"
			. /etc/defaults/rc.conf
			source_rc_confs
		elif [ -r /etc/rc.conf ]; then
			debug "Sourcing /etc/rc.conf (/etc/defaults/rc.conf doesn't exist)."
			. /etc/rc.conf
		fi
		_rc_conf_loaded=true
	fi

	for _d in /etc ${local_startup%*/rc.d}; do
		if [ -f ${_d}/rc.conf.d/"$_name" ]; then
			debug "Sourcing ${_d}/rc.conf.d/$_name"
			. ${_d}/rc.conf.d/"$_name"
		elif [ -d ${_d}/rc.conf.d/"$_name" ] ; then
			local _rc
			for _rc in ${_d}/rc.conf.d/"$_name"/* ; do
				if [ -f "$_rc" ] ; then
					debug "Sourcing $_rc"
					. "$_rc"
				fi
			done
		fi
	done

	# Set defaults if defined.
	for _var in $rcvar $rcvars; do
		eval _defval=\$${_var}_defval
		if [ -n "$_defval" ]; then
			eval : \${$_var:=\$${_var}_defval}
		fi
	done

	# check obsolete rc.conf variables
	for _var in $rcvars_obsolete; do
		eval _v=\$$_var
		eval _msg=\$${_var}_obsolete_msg
		eval _new=\$${_var}_newvar
		case $_v in
		"")
			;;
		*)
			if [ -z "$_new" ]; then
				_msg="Ignored."
			else
				eval $_new=\"\$$_var\"
				if [ -z "$_msg" ]; then
					_msg="Use \$$_new instead."
				fi
			fi
			warn "\$$_var is obsolete.  $_msg"
			;;
		esac
	done
}

#
# load_rc_config_var name var
#	Read the rc.conf(5) var for name and set in the
#	current shell, using load_rc_config in a subshell to prevent
#	unwanted side effects from other variable assignments.
#
load_rc_config_var()
{
	if [ $# -ne 2 ]; then
		err 3 'USAGE: load_rc_config_var name var'
	fi
	eval $(eval '(
		load_rc_config '$1' >/dev/null;
                if [ -n "${'$2'}" -o "${'$2'-UNSET}" != "UNSET" ]; then
			echo '$2'=\'\''${'$2'}\'\'';
		fi
	)' )
}

#
# rc_usage commands
#	Print a usage string for $0, with `commands' being a list of
#	valid commands.
#
rc_usage()
{
	echo -n 1>&2 "Usage: $0 [fast|force|one|quiet]("

	_sep=
	for _elem; do
		echo -n 1>&2 "$_sep$_elem"
		_sep="|"
	done
	echo 1>&2 ")"
	exit 1
}

#
# err exitval message
#	Display message to stderr and log to the syslog, and exit with exitval.
#
err()
{
	exitval=$1
	shift

	if [ -x /usr/bin/logger ]; then
		logger "$0: ERROR: $*"
	fi
	echo 1>&2 "$0: ERROR: $*"
	exit $exitval
}

#
# warn message
#	Display message to stderr and log to the syslog.
#
warn()
{
	if [ -x /usr/bin/logger ]; then
		logger "$0: WARNING: $*"
	fi
	echo 1>&2 "$0: WARNING: $*"
}

#
# info message
#	Display informational message to stdout and log to syslog.
#
info()
{
	case ${rc_info} in
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		if [ -x /usr/bin/logger ]; then
			logger "$0: INFO: $*"
		fi
		echo "$0: INFO: $*"
		;;
	esac
}

#
# debug message
#	If debugging is enabled in rc.conf output message to stderr.
#	BEWARE that you don't call any subroutine that itself calls this
#	function.
#
debug()
{
	case ${rc_debug} in
	[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
		if [ -x /usr/bin/logger ]; then
			logger "$0: DEBUG: $*"
		fi
		echo 1>&2 "$0: DEBUG: $*"
		;;
	esac
}

#
# backup_file action file cur backup
#	Make a backup copy of `file' into `cur', and save the previous
#	version of `cur' as `backup' or use rcs for archiving.
#
#	This routine checks the value of the backup_uses_rcs variable,
#	which can be either YES or NO.
#
#	The `action' keyword can be one of the following:
#
#	add		`file' is now being backed up (and is possibly
#			being reentered into the backups system).  `cur'
#			is created and RCS files, if necessary, are
#			created as well.
#
#	update		`file' has changed and needs to be backed up.
#			If `cur' exists, it is copied to to `back' or
#			checked into RCS (if the repository file is old),
#			and then `file' is copied to `cur'.  Another RCS
#			check in done here if RCS is being used.
#
#	remove		`file' is no longer being tracked by the backups
#			system.  If RCS is not being used, `cur' is moved
#			to `back', otherwise an empty file is checked in,
#			and then `cur' is removed.
#
#
backup_file()
{
	_action=$1
	_file=$2
	_cur=$3
	_back=$4

	if checkyesno backup_uses_rcs; then
		_msg0="backup archive"
		_msg1="update"

		# ensure that history file is not locked
		if [ -f $_cur,v ]; then
			rcs -q -u -U -M $_cur
		fi

		# ensure after switching to rcs that the
		# current backup is not lost
		if [ -f $_cur ]; then
			# no archive, or current newer than archive
			if [ ! -f $_cur,v -o $_cur -nt $_cur,v ]; then
				ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
				rcs -q -kb -U $_cur
				co -q -f -u $_cur
			fi
		fi

		case $_action in
		add|update)
			cp -p $_file $_cur
			ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
			rcs -q -kb -U $_cur
			co -q -f -u $_cur
			chown root:wheel $_cur $_cur,v
			;;
		remove)
			cp /dev/null $_cur
			ci -q -f -u -t-"$_msg0" -m"$_msg1" $_cur
			rcs -q -kb -U $_cur
			chown root:wheel $_cur $_cur,v
			rm $_cur
			;;
		esac
	else
		case $_action in
		add|update)
			if [ -f $_cur ]; then
				cp -p $_cur $_back
			fi
			cp -p $_file $_cur
			chown root:wheel $_cur
			;;
		remove)
			mv -f $_cur $_back
			;;
		esac
	fi
}

# make_symlink src link
#	Make a symbolic link 'link' to src from basedir. If the
#	directory in which link is to be created does not exist
#	a warning will be displayed and an error will be returned.
#	Returns 0 on success, 1 otherwise.
#
make_symlink()
{
	local src link linkdir _me
	src="$1"
	link="$2"
	linkdir="`dirname $link`"
	_me="make_symlink()"

	if [ -z "$src" -o -z "$link" ]; then
		warn "$_me: requires two arguments."
		return 1
	fi
	if [ ! -d "$linkdir" ]; then
		warn "$_me: the directory $linkdir does not exist."
		return 1
	fi
	if ! ln -sf $src $link; then
		warn "$_me: unable to make a symbolic link from $link to $src"
		return 1
	fi
	return 0
}

# devfs_rulesets_from_file file
#	Reads a set of devfs commands from file, and creates
#	the specified rulesets with their rules. Returns non-zero
#	if there was an error.
#
devfs_rulesets_from_file()
{
	local file _err _me _opts
	file="$1"
	_me="devfs_rulesets_from_file"
	_err=0

	if [ -z "$file" ]; then
		warn "$_me: you must specify a file"
		return 1
	fi
	if [ ! -e "$file" ]; then
		debug "$_me: no such file ($file)"
		return 0
	fi

	# Disable globbing so that the rule patterns are not expanded
	# by accident with matching filesystem entries.
	_opts=$-; set -f

	debug "reading rulesets from file ($file)"
	{ while read line
	do
		case $line in
		\#*)
			continue
			;;
		\[*\]*)
			rulenum=`expr "$line" : "\[.*=\([0-9]*\)\]"`
			if [ -z "$rulenum" ]; then
				warn "$_me: cannot extract rule number ($line)"
				_err=1
				break
			fi
			rulename=`expr "$line" : "\[\(.*\)=[0-9]*\]"`
			if [ -z "$rulename" ]; then
				warn "$_me: cannot extract rule name ($line)"
				_err=1
				break;
			fi
			eval $rulename=\$rulenum
			debug "found ruleset: $rulename=$rulenum"
			if ! /sbin/devfs rule -s $rulenum delset; then
				_err=1
				break
			fi
			;;
		*)
			rulecmd="${line%%"\#*"}"
			# evaluate the command incase it includes
			# other rules
			if [ -n "$rulecmd" ]; then
				debug "adding rule ($rulecmd)"
				if ! eval /sbin/devfs rule -s $rulenum $rulecmd
				then
					_err=1
					break
				fi
			fi
			;;
		esac
		if [ $_err -ne 0 ]; then
			debug "error in $_me"
			break
		fi
	done } < $file
	case $_opts in *f*) ;; *) set +f ;; esac
	return $_err
}

# devfs_init_rulesets
#	Initializes rulesets from configuration files. Returns
#	non-zero if there was an error.
#
devfs_init_rulesets()
{
	local file _me
	_me="devfs_init_rulesets"

	# Go through this only once
	if [ -n "$devfs_rulesets_init" ]; then
		debug "$_me: devfs rulesets already initialized"
		return
	fi
	for file in $devfs_rulesets; do
		if ! devfs_rulesets_from_file $file; then
			warn "$_me: could not read rules from $file"
			return 1
		fi
	done
	devfs_rulesets_init=1
	debug "$_me: devfs rulesets initialized"
	return 0
}

# devfs_set_ruleset ruleset [dir]
#	Sets the default ruleset of dir to ruleset. The ruleset argument
#	must be a ruleset name as specified in devfs.rules(5) file.
#	Returns non-zero if it could not set it successfully.
#
devfs_set_ruleset()
{
	local devdir rs _me
	[ -n "$1" ] && eval rs=\$$1 || rs=
	[ -n "$2" ] && devdir="-m "$2"" || devdir=
	_me="devfs_set_ruleset"

	if [ -z "$rs" ]; then
		warn "$_me: you must specify a ruleset number"
		return 1
	fi
	debug "$_me: setting ruleset ($rs) on mount-point (${devdir#-m })"
	if ! /sbin/devfs $devdir ruleset $rs; then
		warn "$_me: unable to set ruleset $rs to ${devdir#-m }"
		return 1
	fi
	return 0
}

# devfs_apply_ruleset ruleset [dir]
#	Apply ruleset number $ruleset to the devfs mountpoint $dir.
#	The ruleset argument must be a ruleset name as specified
#	in a devfs.rules(5) file.  Returns 0 on success or non-zero
#	if it could not apply the ruleset.
#
devfs_apply_ruleset()
{
	local devdir rs _me
	[ -n "$1" ] && eval rs=\$$1 || rs=
	[ -n "$2" ] && devdir="-m "$2"" || devdir=
	_me="devfs_apply_ruleset"

	if [ -z "$rs" ]; then
		warn "$_me: you must specify a ruleset"
		return 1
	fi
	debug "$_me: applying ruleset ($rs) to mount-point (${devdir#-m })"
	if ! /sbin/devfs $devdir rule -s $rs applyset; then
		warn "$_me: unable to apply ruleset $rs to ${devdir#-m }"
		return 1
	fi
	return 0
}

# devfs_domount dir [ruleset]
#	Mount devfs on dir. If ruleset is specified it is set
#	on the mount-point. It must also be a ruleset name as specified
#	in a devfs.rules(5) file. Returns 0 on success.
#
devfs_domount()
{
	local devdir rs _me
	devdir="$1"
	[ -n "$2" ] && rs=$2 || rs=
	_me="devfs_domount()"

	if [ -z "$devdir" ]; then
		warn "$_me: you must specify a mount-point"
		return 1
	fi
	debug "$_me: mount-point is ($devdir), ruleset is ($rs)"
	if ! mount -t devfs dev "$devdir"; then
		warn "$_me: Unable to mount devfs on $devdir"
		return 1
	fi
	if [ -n "$rs" ]; then
		devfs_init_rulesets
		devfs_set_ruleset $rs $devdir
		devfs -m $devdir rule applyset
	fi
	return 0
}

# Provide a function for normalizing the mounting of memory
# filesystems.  This should allow the rest of the code here to remain
# as close as possible between 5-current and 4-stable.
#   $1 = size
#   $2 = mount point
#   $3 = (optional) extra mdmfs flags
mount_md()
{
	if [ -n "$3" ]; then
		flags="$3"
	fi
	/sbin/mdmfs $flags -s $1 md $2
}

# Code common to scripts that need to load a kernel module
# if it isn't in the kernel yet. Syntax:
#   load_kld [-e regex] [-m module] file
# where -e or -m chooses the way to check if the module
# is already loaded:
#   regex is egrep'd in the output from `kldstat -v',
#   module is passed to `kldstat -m'.
# The default way is as though `-m file' were specified.
load_kld()
{
	local _loaded _mod _opt _re

	while getopts "e:m:" _opt; do
		case "$_opt" in
		e) _re="$OPTARG" ;;
		m) _mod="$OPTARG" ;;
		*) err 3 'USAGE: load_kld [-e regex] [-m module] file' ;;
		esac
	done
	shift $(($OPTIND - 1))
	if [ $# -ne 1 ]; then
		err 3 'USAGE: load_kld [-e regex] [-m module] file'
	fi
	_mod=${_mod:-$1}
	_loaded=false
	if [ -n "$_re" ]; then
		if kldstat -v | egrep -q -e "$_re"; then
			_loaded=true
		fi
	else
		if kldstat -q -m "$_mod"; then
			_loaded=true
		fi
	fi
	if ! $_loaded; then
		if ! kldload "$1"; then
			warn "Unable to load kernel module $1"
			return 1
		else
			info "$1 kernel module loaded."
		fi
	else
		debug "load_kld: $1 kernel module already loaded."
	fi
	return 0
}

# ltr str src dst [var]
#	Change every $src in $str to $dst.
#	Useful when /usr is not yet mounted and we cannot use tr(1), sed(1) nor
#	awk(1). If var is non-NULL, set it to the result.
ltr()
{
	local _str _src _dst _out _com _var
	_str="$1"
	_src="$2"
	_dst="$3"
	_var="$4"
	_out=""

	local IFS="${_src}"
	for _com in ${_str}; do
		if [ -z "${_out}" ]; then
			_out="${_com}"
		else
			_out="${_out}${_dst}${_com}"
		fi
	done
	if [ -n "${_var}" ]; then
		setvar "${_var}" "${_out}"
	else
		echo "${_out}"
	fi
}

# Creates a list of providers for GELI encryption.
geli_make_list()
{
	local devices devices2
	local provider mountpoint type options rest

	# Create list of GELI providers from fstab.
	while read provider mountpoint type options rest ; do
		case ":${options}" in
		:*noauto*)
			noauto=yes
			;;
		*)
			noauto=no
			;;
		esac

		case ":${provider}" in
		:#*)
			continue
			;;
		*.eli)
			# Skip swap devices.
			if [ "${type}" = "swap" -o "${options}" = "sw" -o "${noauto}" = "yes" ]; then
				continue
			fi
			devices="${devices} ${provider}"
			;;
		esac
	done < /etc/fstab

	# Append providers from geli_devices.
	devices="${devices} ${geli_devices}"

	for provider in ${devices}; do
		provider=${provider%.eli}
		provider=${provider#/dev/}
		devices2="${devices2} ${provider}"
	done

	echo ${devices2}
}

# Find scripts in local_startup directories that use the old syntax
#
find_local_scripts_old() {
	zlist=''
	slist=''
	for dir in ${local_startup}; do
		if [ -d "${dir}" ]; then
			for file in ${dir}/[0-9]*.sh; do
				grep '^# PROVIDE:' $file >/dev/null 2>&1 &&
				    continue
				zlist="$zlist $file"
			done
			for file in ${dir}/[!0-9]*.sh; do
				grep '^# PROVIDE:' $file >/dev/null 2>&1 &&
				    continue
				slist="$slist $file"
			done
		fi
	done
}

find_local_scripts_new() {
	local_rc=''
	for dir in ${local_startup}; do
		if [ -d "${dir}" ]; then
			for file in `grep -l '^# PROVIDE:' ${dir}/* 2>/dev/null`; do
				case "$file" in
				*.sample) ;;
				*)	if [ -x "$file" ]; then
						local_rc="${local_rc} ${file}"
					fi
					;;
				esac
			done
		fi
	done
}

# check_required_{before|after} command
#	Check for things required by the command before and after its precmd,
#	respectively.  The two separate functions are needed because some
#	conditions should prevent precmd from being run while other things
#	depend on precmd having already been run.
#
check_required_before()
{
	local _f

	case "$1" in
	start)
		for _f in $required_vars; do
			if ! checkyesno $_f; then
				warn "\$${_f} is not enabled."
				if [ -z "$rc_force" ]; then
					return 1
				fi
			fi
		done

		for _f in $required_dirs; do
			if [ ! -d "${_f}/." ]; then
				warn "${_f} is not a directory."
				if [ -z "$rc_force" ]; then
					return 1
				fi
			fi
		done

		for _f in $required_files; do
			if [ ! -r "${_f}" ]; then
				warn "${_f} is not readable."
				if [ -z "$rc_force" ]; then
					return 1
				fi
			fi
		done
		;;
	esac

	return 0
}

check_required_after()
{
	local _f _args

	case "$1" in
	start)
		for _f in $required_modules; do
			case "${_f}" in
				*~*)	_args="-e ${_f#*~} ${_f%%~*}" ;;
				*:*)	_args="-m ${_f#*:} ${_f%%:*}" ;;
				*)	_args="${_f}" ;;
			esac
			if ! load_kld ${_args}; then
				if [ -z "$rc_force" ]; then
					return 1
				fi
			fi
		done
		;;
	esac

	return 0
}

# check_jail mib
#	Return true if security.jail.$mib exists and set to 1.

check_jail()
{
	local _mib _v

	_mib=$1
	if _v=$(${SYSCTL_N} "security.jail.$_mib" 2> /dev/null); then
		case $_v in
		1)	return 0;;
		esac
	fi
	return 1
}

# check_kern_features mib
#	Return existence of kern.features.* sysctl MIB as true or
#	false.  The result will be cached in $_rc_cache_kern_features_
#	namespace.  "0" means the kern.features.X exists.

check_kern_features()
{
	local _v

	[ -n "$1" ] || return 1;
	eval _v=\$_rc_cache_kern_features_$1
	[ -n "$_v" ] && return "$_v";

	if ${SYSCTL_N} kern.features.$1 > /dev/null 2>&1; then
		eval _rc_cache_kern_features_$1=0
		return 0
	else
		eval _rc_cache_kern_features_$1=1
		return 1
	fi
}

# check_namevarlist var
#	Return "0" if ${name}_var is reserved in rc.subr.

_rc_namevarlist="program chroot chdir env flags fib nice user group groups prepend"
check_namevarlist()
{
	local _v

	for _v in $_rc_namevarlist; do
	case $1 in
	$_v)	return 0 ;;
	esac
	done

	return 1
}

# _echoonce var msg mode
#	mode=0: Echo $msg if ${$var} is empty.
#	        After doing echo, a string is set to ${$var}.
#
#	mode=1: Echo $msg if ${$var} is a string with non-zero length.
#
_echoonce()
{
	local _var _msg _mode
	eval _var=\$$1
	_msg=$2
	_mode=$3

	case $_mode in
	1)	[ -n "$_var" ] && echo "$_msg" ;;
	*)	[ -z "$_var" ] && echo -n "$_msg" && eval "$1=finished" ;;
	esac
}

fi # [ -z "${_rc_subr_loaded}" ]

_rc_subr_loaded=:
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