Backout this commit since it breaks startup and some scripts in

certain conditions. I haven't been able to find a better solution yet:

    - Set a two read-only variables (${prefix} and ${etcdir}). This is
    especially useful when using /etc/rc.d scripts with third-party
    software installed from ports.
    - Fix rc.d/sshd to work with openssh from ports using ${etcdir}
    instead of hardcoded /etc.
    - Reflect prefix/etcdir changes in rc.subr.8.

        src/etc/rc.d/sshd: rev 1.9 -> 1.10
        src/etc/rc.subr: rev 1.51 -> 1.52
        src/share/man/man8/rc.subr.8: rev 1.11 -> 1.12

Approved by:	cperciva (mentor)

etc/rc.d/sshd

@@ -19,8 +19,6 @@ extra_commands="keygen reload"
 
 timeout=300
 
-load_rc_config $name
-
 user_reseed()
 {
 	(
@@ -49,46 +47,47 @@ sshd_keygen()
 	umask 022
 
 	# Can't do anything if ssh is not installed
-	[ -x ${prefix}/bin/ssh-keygen ] || {
-		warn "${prefix}/bin/ssh-keygen does not exist."
+	[ -x /usr/bin/ssh-keygen ] || {
+		warn "/usr/bin/ssh-keygen does not exist."
 		return 1
 	}
 
-	if [ -f ${etcdir}/ssh/ssh_host_key ]; then
+	if [ -f /etc/ssh/ssh_host_key ]; then
 		echo "You already have an RSA host key" \
-		    "in ${etcdir}/ssh/ssh_host_key"
+		    "in /etc/ssh/ssh_host_key"
 		echo "Skipping protocol version 1 RSA Key Generation"
 	else
-		${prefix}/bin/ssh-keygen -t rsa1 -b 1024 \
-		    -f ${etcdir}/ssh/ssh_host_key -N ''
+		/usr/bin/ssh-keygen -t rsa1 -b 1024 \
+		    -f /etc/ssh/ssh_host_key -N ''
 	fi
 
-	if [ -f ${etcdir}/ssh/ssh_host_dsa_key ]; then
+	if [ -f /etc/ssh/ssh_host_dsa_key ]; then
 		echo "You already have a DSA host key" \
-		    "in ${etcdir}/ssh/ssh_host_dsa_key"
+		    "in /etc/ssh/ssh_host_dsa_key"
 		echo "Skipping protocol version 2 DSA Key Generation"
 	else
-		${prefix}/bin/ssh-keygen -t dsa -f ${etcdir}/ssh/ssh_host_dsa_key -N ''
+		/usr/bin/ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key -N ''
 	fi
 
-	if [ -f ${etcdir}/ssh/ssh_host_rsa_key ]; then
+	if [ -f /etc/ssh/ssh_host_rsa_key ]; then
 		echo "You already have a RSA host key" \
-		    "in ${etcdir}/ssh/ssh_host_rsa_key"
+		    "in /etc/ssh/ssh_host_rsa_key"
 		echo "Skipping protocol version 2 RSA Key Generation"
 	else
-		${prefix}/bin/ssh-keygen -t rsa -f ${etcdir}/ssh/ssh_host_rsa_key -N ''
+		/usr/bin/ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key -N ''
 	fi
 	)
 }
 
 sshd_precmd()
 {
-	if [ ! -f ${etcdir}/ssh/ssh_host_key -o \
-	    ! -f ${etcdir}/ssh/ssh_host_dsa_key -o \
-	    ! -f ${etcdir}/ssh/ssh_host_rsa_key ]; then
+	if [ ! -f /etc/ssh/ssh_host_key -o \
+	    ! -f /etc/ssh/ssh_host_dsa_key -o \
+	    ! -f /etc/ssh/ssh_host_rsa_key ]; then
 		user_reseed
 		run_rc_command keygen
 	fi
 }
 
+load_rc_config $name
 run_rc_command "$1"

etc/rc.subr

@@ -506,6 +506,9 @@ run_rc_command()
 		;;
 	esac
 
+	eval _override_command=\$${name}_program
+	command=${command:+${_override_command:-$command}}
+
 	_keywords="start stop restart rcvar $extra_commands"
 	rc_pid=
 	_pidcmd=
@@ -873,8 +876,6 @@ run_rc_script()
 #
 load_rc_config()
 {
-	local _tmp
-
 	_name=$1
 	if [ -z "$_name" ]; then
 		err 3 'USAGE: load_rc_config name'
@@ -893,35 +894,9 @@ load_rc_config()
 		fi
 		_rc_conf_loaded=true
 	fi
-
-	eval _override_command=\$${name}_program
-	command=${command:+${_override_command:-$command}}
-	
-	if [ -z "${command}" ]; then
-		_tmp=`/bin/realpath $0`
-		prefix=${_tmp%/etc/rc.d/*}/
-	else
-		prefix=${command%/*bin/*}/
-	fi
-	if [ "${prefix}" = "/" -o "${prefix}" = "/usr/" ] ; then
-		etcdir="/etc"
-	else
-		etcdir="${prefix}etc"
-	fi
-
-	# XXX - Deprecated
-	if [ -f /etc/rc.conf.d/${_name} -a ${etcdir} != "/etc" ]; then
+	if [ -f /etc/rc.conf.d/"$_name" ]; then
 		debug "Sourcing /etc/rc.conf.d/${_name}"
-		warn "Warning: /etc/rc.conf.d/${_name} is deprecated, please use ${etcdir}/rc.conf.d/${_name} instead."
-		if [ -f ${etcdir}/rc.conf.d/${_name} ]; then
-			warn "Warning: Both /etc/rc.conf.d/${_name} and ${etcdir}/rc.conf.d/${_name} exist."
-		fi
-		. /etc/rc.conf.d/${_name}
-	fi
-
-	if [ -f ${etcdir}/rc.conf.d/${_name} ]; then
-		debug "Sourcing ${etcdir}/rc.conf.d/${_name}"
-		. ${etcdir}/rc.conf.d/${_name}
+		. /etc/rc.conf.d/"$_name"
 	fi
 
 	# XXX - Deprecated variable name support

share/man/man8/rc.subr.8

@@ -332,38 +332,12 @@ which is not always the case.
 Source in the configuration files for
 .Ar name .
 First,
-.Pa /etc/defaults/rc.conf
-and
 .Pa /etc/rc.conf
-are sourced if they have not yet been read in.
+is sourced if it has not yet been read in.
 Then,
-.Va etcdir
-is set to
-.Pa /etc
-if
-.Va command Ap s
-prefix (or
-.Va ${name} Ns Va _program Ap s
-if it is defined) is
-.Pa /
-or
-.Pa /usr ,
-otherwise
-.Va etcdir
-is set to
-.Pa ${prefix} Ns Pa /etc .
-Once those variables are set accordingly,
-.Pa /etc/rc.conf.d/ Ns Va ${name}
-is sourced if the file exists (but it is deprecated if
-.Va etcdir
-is different than
-.Pa /etc )
-and then
-.Pa ${etcdir} Ns Pa /defaults/ Ns Va ${name}
-and
-.Va ${etcdir} Ns Pa /rc.conf.d/ Ns Va ${name}
-are sourced if these files exist.
-All these files may also contain other variable assignments to override
+.Pa /etc/rc.conf.d/ Ns Ar name
+is sourced if it is an existing file.
+The latter may also contain other variable assignments to override
 .Ic run_rc_command
 arguments defined by the calling script, to provide an easy
 mechanism for an administrator to override the behaviour of a given