#	$OpenBSD: install.sub,v 1.248 2002/07/18 00:36:44 krw Exp $
#	$NetBSD: install.sub,v 1.5.2.8 1996/09/02 23:25:02 pk Exp $
#
# Copyright (c) 1997-2002 Todd Miller, Theo de Raadt, Ken Westerback
# All rights reserved.
#
# 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.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#	This product includes software developed by Todd Miller and
#	Theo de Raadt
# 4. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
#
# Copyright (c) 1996 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Jason R. Thorpe.
#
# 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.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#        This product includes software developed by the NetBSD
#        Foundation, Inc. and its contributors.
# 4. Neither the name of The NetBSD Foundation nor the names of its
#    contributors may be used to endorse or promote products derived
#    from this software without specific prior written permission.
#
# 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 REGENTS 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.
#

# OpenBSD install/upgrade script common subroutines and initialization code

# Include machine-dependent functions and definitions.
#
# The following functions must be provided:
#	md_congrats()		  - display friendly message
#	md_installboot()	  - install boot-blocks on disk
#	md_prep_disklabel()	  - label the root disk
#	md_set_term()		  - set up terminal
#
# The following variables can be provided if required:
#	MDTERM      - 'vt220' assumed if not provided
#	MDFSTYPE    - nothing assumed if not provided
#	MDFSOPTS    - nothing assumed if not provided
#	MDDISKDEVS  - '/^[sw]d[0-9][0-9]* /s/ .*//p' assumed if not provided
#	MDCDDEVS    - '/^cd[0-9][0-9]* /s/ .*//p'    assumed if not provided
#	MDXAPERTURE - if not empty, set machdep.allowaperture=value in sysctl.conf
. install.md

set_term() {
	[ "$TERM" ] && return
	ask "Specify terminal type:" ${MDTERM:-vt220}
	TERM=$resp
	export TERM

	md_set_term
}

welcome_banner() {
	cat << __EOT

Welcome to the OpenBSD/${ARCH} ${VERSION_MAJOR}.${VERSION_MINOR} ${MODE} program.

This program will help you ${MODE} OpenBSD in a simple and rational way.
__EOT

	if [ "$MODE" = "upgrade" ]; then
		cat << __EOT

As a reminder, installing the 'etc' binary set is NOT recommended.
Once the rest of your system has been upgraded, you should manually
merge any changes to files in the 'etc' set into those files which
already exist on your system.
__EOT
	else
		cat << __EOT

You'll be asked several questions, and it would probably be useful to
have your disk's hardware manual, the installation notes, and a
calculator handy.
__EOT
	fi

	cat << __EOT

As with anything that modifies your disk's contents, this program can
cause SIGNIFICANT data loss, and you are advised to make sure your
data is backed up before beginning the installation process.

Default answers are displayed in brackets after the questions. You can
hit Control-C at any time to quit, but if you do so at a prompt, you
may have to hit return. Also, quitting in the middle of an ${MODE} may
leave your system in an inconsistent state.

If you hit Control-C and restart the ${MODE}, the ${MODE} program will
remember many of your old answers.

At any prompt except password prompts you can run a shell command by
typing '!foo', or escape to a shell by typing '!'.
__EOT
}

get_dkdevs() {
	bsort `sed -ne "${MDDISKDEVS:-/^[sw]d[0-9][0-9]* /s/ .*//p}" /var/run/dmesg.boot`
}

get_cddevs() {
	bsort `sed -ne "${MDCDDEVS:-/^cd[0-9][0-9]* /s/ .*//p}" /var/run/dmesg.boot`
}

get_ifdevs() {
	/sbin/ifconfig -a | egrep -v '^([[:space:]]|(lo|enc|gre|ppp|sl|tun|bridge)[[:digit:]])' | cutword -t: 1
}

# Ask for a password, saving the input in $resp.
#    Display $1 as the prompt.
#    *Don't* allow the '!' options that ask does.
#    *Don't* echo input.
askpass() {
	set -o noglob
	stty -echo
	read resp?"$1 "
	stty echo
	set +o noglob
	echo
}

# Ask for user input.
#
#    $1    = the question to ask the user
#    $2    = the default answer
#
# Save the user input (or the default) in $resp.
#
# Allow the user to escape to shells ('!') or execute commands
# ('!foo') before entering the input.
ask() {
	echo -n "$1 "
	[ $# -lt 2 ] || echo -n "[$2] "

	set -o noglob
	while : ; do
		read resp
		case $resp in
		!)	echo "Type 'exit' to return to install."
			sh
			;;
		!*)	eval ${resp#?}
			;;
		*)	: ${resp:=$2}
			break
			;;
		esac
	done
	set +o noglob
}

# Ask for user input until a non-empty reply is entered.
#
#    $1    = the question to ask the user
#    $2    = the default answer
#
# Save the user input (or the default) in $resp.
ask_until () {
	resp=
	while [ -z "$resp" ] ; do
		ask "$1" "$2"
	done
}

# Ask for the user to select a device from a list generated by scanning
# /var/run/dmesg.boot, and make the device if it doesn't exist.
#
# $1 = question to ask
# $2 = list of devices from /var/run/dmesg.boot scan
# $3 = default device
#
# $resp holds device selected at exit, or 'done'
ask_fordev () {
	local _query=$1 _devs=$2 _defdev=$3

	[ "$_defdev" ] || _defdev=done

	resp=
	while [ -z "$resp" ]; do
		echo "\nAvailable devices are:\n\n${_devs}\n"
		ask "$_query (or done)" "$_defdev"

		if isin $resp $_devs ; then
			makedev $resp || resp=
		elif [ "$resp" != "done" ]; then
			echo "\n'$resp' does not exist."
			resp=
		fi
	done
}

# test the first argument against the remaining ones, return success on a match
isin() {
	local	_a=$1 _b

	shift
	for _b; do
		[ "$_a" = "$_b" ] && return 0
	done
	return 1
}

# add first argument to list formed by the remaining arguments
# adds to the tail if the element does not already exist
addel() {
	local	_a=$1 _b _seen=false

	shift
	for _b; do
		echo "$_b"
		[ "$_a" = "$_b" ] && _seen=true
	done

	$_seen || echo "$_a"
}

# remove all occurrences of first argument from list formed by
# the remaining arguments
rmel() {
	local	_a=$1 _b

	shift
	for _b; do
		[ "$_a" != "$_b" ] && echo "$_b"
	done
}

# read lines on stdin, return Nth element of each line, like cut(1)
cutword () {
	local _a _n _oifs=$IFS

	# optional field separator
	case $1 in
	-t?*) IFS=${1#-t}; shift;;
	esac

	_n=$1
	while read _a; do
		set -- $_a
		[ "$1" ] || break
		eval echo \$$_n
	done
	IFS=$_oifs
}

# read a line of data, return last element. Equiv. of awk '{print $NF}'.
cutlast () {
	read _a; set -- $_a
	[ $# -gt 0 ] || return
	eval echo \$\{$#\}
}

bsort() {
	local _l _a=$1 _b

	case $# in
	0) return;;
	1) echo $1; return;;
	esac

	shift
	for _b; do
		if [[ "$_a" != "$_b" ]] ; then
			if [[ "$_a" > "$_b" ]] ; then
				_l="$_a $_l"; _a=$_b
			else
				_l="$_b $_l"
			fi
		fi
	done

	echo -n $_a

	# Prevent a trailing blank on the output, and thus a bad value
	# for cutlast or cutword, by outputting blanks only when $_l
	# has values to sort.

	if [[ -n "$_l" ]] ; then
		echo -n " "
		bsort $_l
	fi
}

# log in via ftp to host $1 as user $2 with password $3
# and return a list of all files in the directory $4 on stdout
ftp_list_files() {
	ftp ${_ftp_active} -V -n "$1" << __EOT
user "$2" "$3"
cd "$4"
ls
quit
__EOT
}

# $1 is the mountpoint the local directory will be relative to.
# $2 is the default directory
get_setsdir() {
	local _mp=$1 _dir=$2 _mounted
	
	SETSDIR=

	_mounted=`mount | sed -ne "/\(.*\)\/\(${_mp#/}\)\/*\(.*\) type.*/s//\/\3/p"`

	if [ -z "$_mounted" ]; then
	    echo "No filesystems mounted at or below ${_mp}."
	    return
	fi

	while : ; do
		ask "Enter the pathname where the sets are stored (or '?')" "$_dir"
		case $resp in
		"?")	cat << __EOT
The following filesystems are mounted at or below ${_mp} and are therefore
possible sources for ${MODE} sets:

${_mounted}

__EOT
			continue
			;;
		"")	;;
		*)	if [ -d "${_mp}/${resp}" ]; then
				SETSDIR=${_mp}/${resp}
				return
			fi
			echo "The directory '${resp}' does not exist."
			;;
		esac

		ask "\nRe-enter pathname?" y
		case $resp in
		y*|Y*)	;;
		*)	break
			;;
		esac
	done
}

makedev() {
	local _d=$1

	if [ ! -c /dev/r${_d}c ]; then
		if [ -r /dev/MAKEDEV ]; then
			(cd /dev; sh MAKEDEV $_d)
		else
			echo "Device nodes for $_d are missing, and MAKEDEV"
			echo "does not exist to create them with.  Sorry."
			false
		fi
	fi
}

get_rootdisk() {
	local _defdsk

	ROOTDISK=

	_defdsk=`echo $DKDEVS | cutlast`
	[ "$_defdsk" = "$DKDEVS" ] || _defdsk=

	cat << __EOT

The installation program needs to know which disk to consider the root disk.
Note the unit number may be different than the unit number you used in the
boot program (especially on a machine with multiple disk controllers).
__EOT
	ask_fordev "Which disk is the root disk?" "$DKDEVS" "$_defdsk"
	[ "$resp" = "done" ] && exit

	ROOTDISK=$resp
	ROOTDEV=${ROOTDISK}a
}

# Create an entry in the hosts file. If an entry with the
# same symbolic name already exists, delete it.
# $1 - IP address
# $2 - symbolic name
addhostent() {
	sed "/ $2\$/d" /tmp/hosts > /tmp/hosts.new
	mv /tmp/hosts.new /tmp/hosts

	echo "$1 $2" >> /tmp/hosts
}

# Create a hostname.* file for the interface.
# $1 - interface name
# $2 - interface symbolic name
# $3 - interface IP address
# $4 - interface netmask
# $5 - (optional) interface media directives
addifconfig() {
	if [ "$3" = "dhcp" ]; then
		echo "dhcp NONE NONE NONE $5" > /tmp/hostname.$1
		addhostent 127.0.0.1 $2
	else
		echo "inet $3 $4 NONE $5" > /tmp/hostname.$1
		addhostent $3 $2
	fi
}

# Show selection list and get user response to give question
# in global _resp.
#
# $1 = full list to display
# $2 = list of already selected elements
# $3 = question to ask user
do_selection_list() {
	local _next _elem

	for _elem in $1; do
		if isin $_elem $2; then
			echo -n "	[X] "
		else
			echo -n "	[ ] "
			: ${_next:=$_elem}
		fi
		echo $_elem
	done
	: ${_next:=done}

	ask "\n$3 (or 'done')" "$_next"
}

configure_all_interfaces() {
	local _ifsdone _ifs

	while : ; do
		cat << __EOT

You may configure the following network interfaces (the interfaces
marked with [X] have been successfully configured):

__EOT
		do_selection_list "$IFDEVS" "$_ifsdone" "Configure which interface?"

		case $resp in
		"done")	break	
			;;
		*)	_ifs=$resp
			if isin $_ifs $IFDEVS ; then
				if configure_ifs $_ifs ; then
					_ifsdone="$_ifs $_ifsdone"
				fi
			else
				echo "Invalid response: '$resp' is not in list"
			fi
			;;
		esac
	done
}

configure_ifs() {
	local _up _if_name=$1 _if_ip _if_mask
	local _if_symname _if_extra _hostname
	local _dhcp_prompt

	set -- `ifconfig $_if_name | sed -n '
		1s/.*<UP,.*$/UP/p
		1s/.*<.*>*$/DOWN/p
		/media:/s/^.*$//
		/status:/s/^.*$//
		/inet/s/--> [0-9.][0-9.]*//
		/inet/s/netmask//
		/inet/s/broadcast//
		/inet/s/inet// p'`

	_up=$1
	_if_ip=$2
	_if_mask=$3

	[ $_up = "UP" ] && ifconfig $_if_name delete down

	[ -x /sbin/dhclient ] && _dhcp_prompt=" (or 'dhcp')"

	# Get IP address
	resp=
	while [ -z "$resp" ] ; do
		ask "IP address${_dhcp_prompt}?" "$_if_ip"
		if [ ! -x /sbin/dhclient -a "$resp" == "dhcp" ]; then
			echo "DHCP is not supported."
			resp=
		fi
	done
	_if_ip=$resp

	# Get symbolic name
	_hostname=`hostname`
	ask_until "Symbolic (host) name?" "$_hostname"
	_if_symname=$resp

	# Get netmask
	if [ "$_if_ip" != "dhcp" ]; then
		ask_until "Netmask?" "${_if_mask:=255.255.255.0}"
		_if_mask=$resp
	fi

	if [ "`ifconfig -m ${_if_name} | sed -n '/media/p'`" ]; then
		cat << __EOT
Your use of the network interface may require non-default
media directives. The default media is:
__EOT
		ifconfig -m ${_if_name} | sed -n '
			/supported/D
			/media:/p'
		echo "This is a list of supported media:"
		ifconfig -m ${_if_name} | sed -n '
			/media:/D
			s/^	//
			/media/p'
		cat << __EOT
If the default is not satisfactory, and you wish to use another
media, copy that line from above (e.g. "media 100baseTX")
__EOT
		ask "Media directives?"
		_if_extra=$resp
	fi

	# Configure the interface. If it
	# succeeds, add it to the permanent
	# network configuration info.
	if [ "$_if_ip" = "dhcp" ]; then
		ifconfig ${_if_name} down ${_if_extra}
		cat > /etc/dhclient.conf << __EOT
initial-interval 1;
send host-name "$_hostname";
request subnet-mask, broadcast-address, routers,
	domain-name, domain-name-servers, host-name;
__EOT
		dhclient -1 ${_if_name}

		set -- `ifconfig $_if_name | sed -n '
			1s/.*<UP,.*$/UP/p
			1s/.*<.*>*$/DOWN/p
			/media:/s/^.*$//
			/status:/s/^.*$//
			/inet/s/--> [0-9.][0-9.]*//
			/inet/s/netmask//
			/inet/s/broadcast//
			/inet/s/inet// p'`

		if [ $1 = "UP" -a $2 = "0.0.0.0" ]; then
			echo "hostname-associated DHCP attempt for $_if_name failed..."
			ifconfig $_if_name delete down

			cat > /etc/dhclient.conf << __EOT
initial-interval 1;
request subnet-mask, broadcast-address, routers,
	domain-name, domain-name-servers, host-name;
__EOT
			dhclient -1 ${_if_name}
			set -- `ifconfig $_if_name | sed -n '
				1s/.*<UP,.*$/UP/p
				1s/.*<.*>*$/DOWN/p
				/media:/s/^.*$//
				/status:/s/^.*$//
				/inet/s/--> [0-9.][0-9.]*//
				/inet/s/netmask//
				/inet/s/broadcast//
				/inet/s/inet// p'`

			if [ $1 = "UP" -a $2 = "0.0.0.0" ]; then
				echo "free-roaming DHCP attempt for $_if_name failed."
				ifconfig $_if_name delete down
				return 1
			else
				echo "DHCP attempt for $_if_name successful."
				addifconfig ${_if_name} ${_if_symname} ${_if_ip}
				return 0
			fi
		else
			echo "DHCP configuration of $_if_name successful."
			addifconfig ${_if_name} ${_if_symname} ${_if_ip}
			return 0
		fi
	else
		ifconfig ${_if_name} down
		if ifconfig ${_if_name} inet \
			${_if_ip} \
			netmask ${_if_mask} ${_if_extra} up
			then
			addifconfig ${_if_name} ${_if_symname} ${_if_ip} ${_if_mask} "$_if_extra"
			return 0
		fi
	fi
	return 1
}

# Returns true if $1 contains only alphanumerics
isalphanumeric() {
	local _n
	_n=$1
	while [ ${#_n} != 0 ]; do
		case $_n in
		[A-Za-z0-9]*)	;;
		*)		return 1;;
		esac
		_n=${_n#?}
	done
	return 0
}

# Much of this is gratuitously stolen from /etc/netstart.
enable_network() {
	# Check for required network related files
	for _netfile in hosts myname; do
		if [ ! -f /mnt/etc/${_netfile} ]; then
			echo "ERROR: no /mnt/etc/${_netfile}!"
			return 1
		fi
	done

	# Copy any required or optional files found
	for _netfile in hosts myname dhclient.conf resolv.conf resolv.conf.tail protocols services; do
		if [ -f /mnt/etc/${_netfile} ]; then
			cp /mnt/etc/${_netfile} /etc/${_netfile}
		fi
	done

	hostname=`cat /etc/myname`
	hostname $hostname

	DIDNET=y

	# set the address for the loopback interface
	ifconfig lo0 inet localhost

	# use loopback, not the wire
	route -n add -host $hostname localhost > /dev/null
	route -n add -net 127 127.0.0.1 -reject > /dev/null

	# configure all of the non-loopback interfaces which we know about.
	# refer to hostname.if(5)
	for hn in /mnt/etc/hostname.*; do
		# Strip off /mnt/etc/hostname. prefix
		if=${hn#/mnt/etc/hostname.}

		# Interface names must be alphanumeric only. We check to avoid
		# configuring backup or temp files, and to catch the "*" case.
		if ! isalphanumeric "$if"; then
			continue
		fi
		ifconfig $if > /dev/null 2>&1
		if [ $? -ne 0 ]; then
			continue
		fi

		# Now parse the hostname.* file
		while :; do
			if [ "$cmd2" ]; then
				# we are carrying over from the 'read dt dtaddr' last time
				set -- $cmd2
				af=$1 name=$2 mask=$3 bcaddr=$4 ext1=$5 cmd2=
				# make sure and get any remaining args in ext2, like the read below
				i=1; while [ i -lt 6 -a -n "$1" ]; do shift; let i=i+1; done
				ext2="$@"
			else
				# read the next line or exit the while loop
				read af name mask bcaddr ext1 ext2 || break
			fi
			# $af can be "dhcp", "up", "rtsol", an address family, commands, or
			# a comment.
			case $af in
			"#"*|"!"*|"bridge"|""|"rtsol")
				# skip comments, user commands, bridges,
				# IPv6 rtsol and empty lines
				continue
				;;
			"dhcp")	[ "$name" = "NONE" ] && name=
				[ "$mask" = "NONE" ] && mask=
				[ "$bcaddr" = "NONE" ] && bcaddr=
				ifconfig $if $name $mask $bcaddr $ext1 $ext2 down
				cmd="dhclient $if"
				;;
			"up")
				# The only one of these guaranteed to be set is $if
				# the remaining ones exist so that media controls work
				cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
				;;
			*)	read dt dtaddr
				if [ "$name" = "alias" ]; then
					# perform a 'shift' of sorts
					alias=$name
					name=$mask
					mask=$bcaddr
					bcaddr=$ext1
					ext1=$ext2
					ext2=
				else
					alias=
				fi
				cmd="ifconfig $if $af $alias $name "
				case $dt in
				dest)	cmd="$cmd $dtaddr"
					;;
				[a-z!]*)
					cmd2="$dt $dtaddr"
					;;
				esac
				if [ ! -n "$name" ]; then
					echo "/mnt/etc/hostname.$if: invalid network configuration file"
					return
				fi
				case $af in
				inet)	[ "$mask" ] && cmd="$cmd netmask $mask"
					if [ "$bcaddr" -a "$bcaddr" != "NONE" ]; then
						cmd="$cmd broadcast $bcaddr"
					fi
					[ "$alias" ] && rtcmd="; route -n add -host $name 127.0.0.1"
					;;
				inet6)
					# Ignore IPv6 setup
					continue
					;;
				*)	cmd="$cmd $mask $bcaddr"
				esac
				cmd="$cmd $ext1 $ext2$rtcmd" rtcmd=
				;;
			esac
			eval "$cmd"
		done < /mnt/etc/hostname.$if
	done

	# /mnt/etc/mygate, if it exists, contains the name of my gateway host
	# that name must be in /etc/hosts.
	if [ -f /mnt/etc/mygate ]; then
		route delete default > /dev/null 2>&1
		route -n add -host default `cat /mnt/etc/mygate`
	fi

	# Get FQDN after any DHCP manipulation of resolv.conf is done
	get_fqdn /etc/resolv.conf

	# Display results...
	echo "Network interface configuration:"
	ifconfig -am

	# enable the resolver if resolv.conf is available
	if [ -f /etc/resolv.conf ]; then
		route show
		echo "\nResolver enabled."
	else
		route -n show
		echo "\nResolver not enabled."
	fi

	return 0
}

# Do globbing on the selection and parse +/-, sets the global
# GET_FILES appropriately.
glob_selection() {
	local _selection=$1 _src=$2
	local _action _nomatch _f

	# Change +/- into add/remove, but ignore bare '+' or '-'
	_action=addel
	case $_selection in
	""|+|-)	return
		;;
	+*)	_selection=${_selection#?}
		;;
	-*)	_selection=${_selection#?}
		_action=rmel
		;;
	esac

	[ "$_selection" = "all" ] && _selection=*

	set -o noglob
	for _f in $SETS; do
		eval "case $_f in
		$_selection)
			GET_FILES=\`$_action $_f \$GET_FILES\`
			_nomatch=false
			;;
		esac"
	done
	set +o noglob

	if $_nomatch; then
		cat << __EOT
The file

    '${_src}/${_selection}'

does not exist. Check to make sure you entered the name properly.
__EOT
	fi
}

# Set global SETS to either
#     1) a list of sets found in both $1 and $THESETS, where
#        $2 is the location that generated the list of files in $1.
# or
#     2) a list of .tgz or .tar.gz files found in $2
get_sets () {
	local _f _file_list=$1 _src=$2

	SETS=

	for _f in $THESETS ; do
		if [ "$_f" = "kernel" ]; then
			if isin bsd $_file_list; then
				SETS="$SETS bsd"
			fi
		elif isin ${_f}${VERSION}.tar.gz $_file_list; then
			SETS="$SETS ${_f}${VERSION}.tar.gz"
		elif isin ${_f}${VERSION}.tgz $_file_list; then
			SETS="$SETS ${_f}${VERSION}.tgz"
		fi
	done

	if [ -z "$SETS" ]; then
		cat << __EOT
The directory

    '${_src}'

contains no OpenBSD ${VERSION_MAJOR}.${VERSION_MINOR} ${MODE} sets.
__EOT
		ask "Search for other *.tar.gz and *.tgz files?" y
		case $resp in
		n*|N*)	return ;;
		esac
		# *.tar.gz and *.tgz are possible sets
		for _f in $_file_list ; do
			case $_f in
			*.tar.gz|*.tgz)	SETS="$SETS ${_f}"
			esac
		done
	fi

	if [ -z "$SETS" ]; then
		ask "There are no *.tar.gz or *.tgz files in ${_src}.\nSee a directory listing?" y
		case $resp in
		n*|N*)	return ;;
		esac
		echo "\n${_file_list}\n"
		return
	fi
}

# Set global GET_FILES to the list of sets requested by the user.
# $1 = list of files available in source directory or url.
# $2 = source directory or url
get_get_files () {
	local _files=$1 _src=$2

	GET_FILES=

	get_sets "$_files" "$_src"

	[ "$SETS" ] || return

	cat << __EOT

You will now be asked which sets to ${MODE}. Some of these sets are required
for your ${MODE} and some are optional. You will want at least the
base and bsd sets. Consult the installation notes if you are not sure
which sets are required!
__EOT
	# Set the default list of files
	for _f in $SETS ; do
		# $SETS contains only .tgz and .tar.gz file names and 'bsd'.
		case $_f in
		base*|bsd|comp*|etc*|game*|man*|misc*)
			isin $_f $SETSDONE || GET_FILES=`addel $_f $GET_FILES`
			;;
		esac
	done

	# Allow the user to select/de-select additional sets
	while : ; do
		cat << __EOT

The following sets are available. Enter a filename, 'all' to select
all the sets, or 'done'. You may de-select a set by prepending a '-'
to its name.

__EOT
		do_selection_list "$SETS" "$GET_FILES" "File Name?"

		[ "$resp" = "done" ] && break

		glob_selection "$resp" "$_src"
	done
}

# Install the list of files in the global GET_FILES from the source
# named in $1. Display an error message for failed installs so the
# user will know to try again.
install_get_files () {
	local _f _src=$1

	ask "Ready to ${MODE} sets?" y
	case $resp in 
	n*|N*)	return ;;
	esac

	echo
	for _f in $GET_FILES ; do
		echo "Getting ${_f} ..."
		case $_f in
		*.tar.gz|*.tgz)
			ftp ${_ftp_active} -o - -V -m "${_src}/${_f}" | tar zxpf - -C /mnt
			;;
		*)
			ftp ${_ftp_active} -o "/mnt/${_f}" -V -m "${_src}/${_f}"
			;;
		esac
		if [ $? -ne 0 ]; then
			echo "'${_f}' did not install correctly."
		else
			SETSDONE=`addel ${_f} ${SETSDONE}`
		fi
	done
}

# Encode $1 as specified for usercodes and passwords in RFC 1738
# section 3.1, and now supported by our in-tree ftp:
#
#    ':' -> '%3a'
#    '@' -> '%40'
#    '/' -> '%2f'
#
# *NOTE* quotes around $1 are required to preserve trailing or
# embeddded blanks in usercodes and passwords!
encode_for_url() {
	echo "$1" | sed -e 's/:/%3a/g' -e 's/@/%40/g' -e 's/\//%2f/g'
}

# Get several parameters from the user, and xfer
# files from the server.
# $1 = url type (ftp or http)
# Note:	_ftp_server_ip, _ftp_server_dir, _ftp_server_login,
#	_ftp_server_password, and _ftp_active must be global.
install_url() {
	local _f _file_list _url_type=$1 _url_base _url_login _url_pass _oifs

	donetconfig

	cat << __EOT

This is an automated ${_url_type}-based installation process. You will be asked
questions and then the files will be retrieved iteratively via ${_url_type}.

__EOT
	# Proxy the connections?
	: ${_proxy_host:=none}

	ask "HTTP/FTP proxy URL? (e.g. 'http://proxy:8080', or 'none')" "$_proxy_host"
	if [ "$resp" = "none" ]; then
		unset _proxy_host ftp_proxy http_proxy
	else
		_proxy_host=$resp
		export ftp_proxy=${_proxy_host}
		export http_proxy=${_proxy_host}
	fi
	if [ "$_url_type" = "ftp" -a -z "$ftp_proxy" ]; then
		# Use active mode ftp? (irrelevant if using a proxy)
		case $_ftp_active in
		-A)	resp=y ;;
		*)	resp=n ;;
		esac

		cat << __EOT
By default, ftp will attempt a passive connection and fall back to a normal
(active) connection if that does not work. However, there are some very
old ftp servers that claim to support passive mode, but really do not.
In this case, you should explicitly request an active session.
__EOT
		ask "Do you want to use active ftp?" "$resp"
		case $resp in
		y*|Y*)	_ftp_active=-A ;;
		*)	unset _ftp_active ;;
		esac
	fi

	# Provide a list of possible servers
	: ${_ftp_getlist:=y}

	ask "Do you want a list of potential ${_url_type} servers?" "$_ftp_getlist"
	case $resp in
	n*|N*)	_ftp_getlist=n
		;;
	*)
		_ftp_getlist=y
		# ftp.openbsd.org == 129.128.5.191 and will remain at
		# that address for the forseeable future.
		ftp ${_ftp_active} -V -a -o /tmp/ftplist ftp://129.128.5.191/pub/OpenBSD/${VERSION_MAJOR}.${VERSION_MINOR}/ftplist > /dev/null
		grep "^${_url_type}:" /tmp/ftplist | cat -n | less -XE
		;;
	esac

	# Get server IP address or hostname
	resp=
	while [ -z "$resp" ] ; do
		if [ ! -f /tmp/ftplist ]; then
			eval ask \"Server IP address, or hostname?\" \"\$_${_url_type}_server_ip\"
			continue;
		fi
	
		eval ask \"Server IP address, hostname, or list#?\" \"\$_${_url_type}_server_ip\"

		case $resp in
		"?")
			grep "^${_url_type}:" /tmp/ftplist | cat -n | less -XE
			resp=
			;;
		+([0-9]))
			maxlines=`grep "^${_url_type}:" /tmp/ftplist | sed -ne '$='`

			if [ $maxlines -lt $resp -o $resp -lt 1 ]; then
				echo "There is no ${resp}th line in the list."
			else	
				tline=`grep "^${_url_type}:" /tmp/ftplist | sed -ne "${resp}p"`
				url=`echo $tline | sed -e "s/^${_url_type}:\/\///" |
					cutword -t' ' 1 | cutword -t' ' 1`
				host=`echo $url | cutword -t/ 1`
				path=`echo $url | sed -e "s/^${host}\///"`
				path=${path}/${VERSION_MAJOR}.${VERSION_MINOR}/${ARCH}
				eval _${_url_type}_server_ip=$host
				eval _${_url_type}_server_dir=$path
				echo "Using	$tline"
			fi

			# Always do it again, just to double check
			resp=
			;;
		*)
			;;
		esac
	done

	eval _${_url_type}_server_ip=$resp

	# Get server directory
	if [ "$_url_type" = "ftp" -a -z "$_ftp_server_dir" ] ; then
		# Default ftp dir
		_ftp_server_dir=pub/OpenBSD/${VERSION_MAJOR}.${VERSION_MINOR}/${ARCH}
	fi

	eval ask_until \"Server directory?\" \"\$_${_url_type}_server_dir\"
	eval _${_url_type}_server_dir=$resp

	if [ "$_url_type" = "ftp" ]; then
		# Get login name, setting IFS to nothing so trailing or
		# embedded blanks are preserved!
		_oifs=$IFS
		IFS=
		ask_until "Login?" "${_ftp_server_login:=anonymous}"
		_ftp_server_login=$resp

		# Get password unless anonymous
		_ftp_server_password=root@`hostname`.$FQDN
		if [ "$_ftp_server_login" != "anonymous" ]; then
			resp=
			while [ -z "$resp" ] ; do
				askpass "Password (will not echo):"
			done
			_ftp_server_password=$resp
		fi
		IFS=$_oifs
	fi

	# Build up the base url since it is so nasty...
	if [ "$_url_type" = "ftp" -a "$_ftp_server_login" != "anonymous" ]; then
		_url_login=`encode_for_url "$_ftp_server_login"`
		_url_pass=`encode_for_url "$_ftp_server_password"`
		_url_base=ftp://${_url_login}:${_url_pass}@${_ftp_server_ip}/${_ftp_server_dir}
	else
		eval _url_base=${_url_type}://\$_${_url_type}_server_ip/\$_${_url_type}_server_dir
	fi

	# Get list of files from the server.
	# XXX - check for nil $_file_list and deal
	if [ "$_url_type" = "ftp" -a -z "$ftp_proxy" ] ; then
		_file_list=`ftp_list_files "$_ftp_server_ip" "$_ftp_server_login" "$_ftp_server_password" "$_ftp_server_dir"`
	else
		# Assumes index file is "index.txt" for http (or proxy)
		# We can't use index.html since the format is server-dependent
		_file_list=`ftp -o - -V "${_url_base}/index.txt" | sed 's/
//'`
	fi

	get_get_files "$_file_list" "`eval echo \\$_${_url_type}_server_dir`"

	# User may have selected no files
	[ "$GET_FILES" ] || return

	cat << __EOT

Fetching files via ${_url_type} may take a long time, especially over a slow
network connection.
__EOT

	install_get_files "$_url_base"
}

# $1 - mount point directory is relative to
# $2 - default directory
install_mounted_fs() {
	local _f

	get_setsdir "$1" "$2"

	[ -d "$SETSDIR" ] || return

	get_get_files "`ls -l ${SETSDIR}`" "$SETSDIR"

	# User may have selected no files
	[ "$GET_FILES" ] || return

	install_get_files "file:$SETSDIR"
}

install_cdrom() {
	local _drive _part _fstype _directory _n

	# Get the cdrom device info
	if [ -z "$CDDEVS" ]; then
		echo "No CD-ROM devices are available."
		return
	fi

	cat << __EOT

Please make sure the CD is in the CD-ROM drive and select
the device containing the CD with the installation sets.
__EOT

	ask_fordev "Which CD-ROM contains the installation media?" "$CDDEVS" "`echo $CDDEVS | cutword 1`"
	[ "$resp" = "done" ] && return

	_drive=$resp

	# If it is an ISO9660 CD-ROM, we don't need to ask any other questions
	_n=0
	until disklabel $_drive >/tmp/label.$_drive 2>&1; do
		# Try up to 6 times to access the CD
		if egrep -q '(Input/output error)|(sector size 0)' /tmp/label.$_drive; then
			_n=$(( $_n + 1 ))
			if [ _n -le 5 ]; then
				echo "I/O error accessing $_drive; retrying"
				sleep 10
			else
				echo "Cannot access $_drive."
				return
			fi
		else
			break
		fi
	done

	echo
	if grep -q '^ *c: .*ISO9660' /tmp/label.$_drive; then
		_fstype=cd9660
		_part=c
	else
		# Get partition from user
		resp=
		while [ -z "$resp" ] ; do
			ask "CD-ROM partition to mount? (normally 'c')" c
			case $resp in
			[a-p])
				_part=$resp
				;;
			*)	echo "Invalid response: $resp"
				# force loop to repeat
				resp=
				;;
			esac
		done

		# Ask for filesystem type
		cat << __EOT

There are two CD-ROM filesystem types currently supported by this program:
cd9660		ISO-9660
ffs		Berkeley Fast Filesystem

__EOT
		resp=
		while [ -z "$resp" ] ; do
			ask "Which filesystem type?" cd9660
			case $resp in
			cd9660|ffs)
				_fstype=$resp
				;;
			*)	echo "Invalid response: '$resp'"
				# force loop to repeat
				resp=
				;;
			esac
		done
	fi

	rm -f /tmp/label.$_drive

	# Mount the CD-ROM
	if ! mount -t ${_fstype} -o ro /dev/${_drive}${_part} /mnt2 ; then
		echo "Cannot mount CD-ROM drive."
		return
	fi

	install_mounted_fs /mnt2 "${VERSION_MAJOR}.${VERSION_MINOR}/${ARCH}"
	umount -f /mnt2 > /dev/null 2>&1
}

mount_a_disk() {
	# Mount a disk on /mnt2. The set of disk devices to choose from
	# is $DKDEVS.
	# returns 0 on success, 1 on failure

	local _drive _def_partition _partition_range _partition
	local _fstype _fsopts

	cat << __EOT

Please select the disk device containing the partition with the
installation sets.
__EOT

	ask_fordev "Which is the disk with the installation sets?" "$DKDEVS"
	[ "$resp" = "done" ] && return 1

	_drive=$resp

	# Get partition
	cat << __EOT

The following partitions have been found on $_drive:

__EOT
	disklabel $_drive 2>/dev/null | grep '^  .:'
	echo
	_likely_partition_range=`disklabel $_drive 2>/dev/null | \
		sed -n	-e '/swap/s/.*//' -e '/unused/s/.*//' \
			-e '/^  .:/{s/^  \(.\).*/\1/;H;}' \
			-e '${g;s/\n//g;s/^/[/;s/$/]/p;}'`
	_partition_range=`disklabel $_drive 2>/dev/null | \
		sed -n	-e '/^  .:/{s/^  \(.\).*/\1/;H;}' \
			-e '${g;s/\n//g;s/^/[/;s/$/]/p;}'`
	_def_partition=`echo $_likely_partition_range | \
		sed -n 's/^\[\(.\).*\]/\1/p'`
	if [ -z "$_def_partition" ]; then
		_def_partition=`echo $_partition_range | \
			sed -n 's/^\[\(.\).*\]/\1/p'`
		if [ -z "$_def_partition" ]; then
			echo "There are no usable partitions on that disk"
			return 1
		fi
	fi

	resp=
	while [ -z "$resp" ]; do
		ask "Partition?" "$_def_partition"
		case $resp in
		$_partition_range)
			_partition=$resp
			;;
		*)	echo "Invalid response: $resp"
			# force loop to repeat
			resp=
			;;
		esac
	done

	# Ask for filesystem type
	cat << __EOT

The following filesystem types are supported:
default		(deduced from the disklabel)
ffs
$MDFSTYPE
__EOT

	resp=
	while [ -z "$resp" ]; do
		ask "Which filesystem type?" default
		case $resp in
		default)
			;;
		ffs)	_fstype="-t ffs"
			_fsopts=async
			;;
		$MDFSTYPE)
			_fstype="-t $resp"
			_fsopts=$MDFSOPTS
			;;
		*)	echo "Invalid response: $resp"
			# force loop to repeat
			resp=
			;;
		esac
	done

	# Mount the disk read-only
	if ! mount $_fstype -o ro,$_fsopts /dev/${_drive}${_partition} /mnt2; then
		echo "Cannot mount disk."
		return 1
	fi

	return 0
}

install_disk() {
	if mount_a_disk; then
		install_mounted_fs /mnt2
		umount -f /mnt2 > /dev/null 2>&1
	fi
}

install_nfs() {
	# Can we actually mount NFS filesystems?
	if [ ! -f /sbin/mount_nfs ]; then
		echo "/sbin/mount_nfs not found. Cannot mount NFS filesystems."
		return
	fi

	donetconfig

	# Get the IP address of the server
	ask_until "Server IP address or hostname?" "$_nfs_server_ip"
	_nfs_server_ip=$resp

	# Get server path to mount
	ask_until "Filesystem on server to mount?" "$_nfs_server_path"
	_nfs_server_path=$resp

	# Determine use of TCP
	ask "Use TCP transport? (only works with capable NFS server)" n
	case $resp in
	y*|Y*)	_nfs_tcp=-T
		;;
	*)	_nfs_tcp=
		;;
	esac

	# Mount the server
	if ! mount_nfs $_nfs_tcp -o ro ${_nfs_server_ip}:${_nfs_server_path} /mnt2 ; then
		echo "Cannot mount NFS server."
		return
	fi

	install_mounted_fs /mnt2
	umount -f /mnt2 > /dev/null 2>&1
}

install_tape() {
	local _xcmd

	# Get the name of the tape from the user.
	cat << __EOT

The installation program needs to know which tape device to use. Make
sure you use a "no rewind on close" device.

__EOT
	ask_until "Name of tape device?" "${TAPE##*/}"
	TAPE=/dev/${resp##*/}
	if [ ! -c $TAPE ]; then
		echo "$TAPE does not exist or is not a character special file."
		return
	fi
	export TAPE

	# Rewind the tape device
	echo -n "Rewinding ${TAPE} (mt rewind)..."
	if ! mt rewind ; then
		echo "FAILED."
		return
	fi
	echo "done."

	# Get the file number
	resp=
	while [ -z "$resp" ]; do
		ask "File number?"
		case $resp in
		[1-9]*)	_nskip=$(( $resp - 1 ))
			;;
		*)	echo "Invalid file number ${resp}."
			# force loop to repeat
			resp=
			;;
		esac
	done

	# Skip to correct file.
	if [ $_nskip -ne 0 ]; then
		echo -n "Skipping to source file (mt fsf ${_nskip})..."
		if ! mt fsf $_nskip ; then
			echo "FAILED. Could not skip $_nskip files."
			return
		fi
		echo "done."
	fi

cat << __EOT

There are 2 different ways the file can be stored on tape:

1) an image of a gzipped tar file
2) a standard tar image

__EOT

	resp=
	while [ -z "$resp" ]; do
		ask "Which way is it?" 1
		case $resp in
		1)	_xcmd="tar -zxvpf -"
			;;
		2)	_xcmd="tar -xvpf -"
			;;
		*)	echo "Invalid response: $resp."
			# force loop to repeat
			resp=
			;;
		esac
		( cd /mnt; dd if=$TAPE | $_xcmd )
	done
	echo "Extraction complete."
}

set_timezone() {
	local _zoneroot=/mnt/usr/share/zoneinfo/ _zonepath

	# If the timezone directory structure is not
	# available, return immediately.

	[ ! -d $_zoneroot ] && return

	cat << __EOT

Select a time zone for your location. Timezones are represented on the system
by a directory structure rooted in "/usr/share/timezone". Most timezones can
be selected by entering a token like "CET" or "GMT-6". Other zones are
grouped by continent or country, with detailed zone information separated by
a slash ("/"), e.g. "US/Pacific" or "Canada/Mountain".

__EOT

	if [ -L /mnt/etc/localtime ]; then
		TZ=`ls -l /mnt/etc/localtime 2>/dev/null | cutlast`
		TZ=${TZ#${_zoneroot#/mnt}}
	fi

	: ${TZ:=GMT}

	while : ; do
		_zonepath=$_zoneroot

		ask "What timezone are you in? ('?' for list)" "$TZ"

		if [ "$resp" = "?" ]; then
			ls -F ${_zonepath}
			continue;
		fi

		_zonepath=${_zonepath}${resp}

		while [ -d "$_zonepath" ]; do
			echo -n "Select a sub-timezone of "
			ask "'${_zonepath#$_zoneroot}' ('?' for list):"
			if [ "$resp" = "?" ]; then
				ls -F ${_zonepath}
			else
				_zonepath=${_zonepath}/${resp}
			fi
		done

		if [ -f "$_zonepath" ]; then
			TZ=${_zonepath#$_zoneroot}
			echo "You have selected timezone '$TZ'".
			ln -sf /usr/share/zoneinfo/$TZ /mnt/etc/localtime
			return
		fi

		echo -n "'${_zonepath#$_zoneroot}'"
		echo " is not a valid timezone on this system."
	done
}

sane_install() {
	if [ ! -s /mnt/bsd ]; then
		cat << __EOT

Warning, no kernel (/mnt/bsd) installed! You did not unpack a file set
containing a kernel -- this is needed to boot. Please note that the install
kernel is *not* suitable for general use.
__EOT
	elif [ ! -f /mnt/bin/cat ]; then
		cat << __EOT

You still do not have a /bin/cat in your filesystem (i.e. a sample random file
which you probably want). This seems to indicate that you are still missing
important distribution files.
__EOT
	elif [ ! -x /mnt/dev/MAKEDEV ]; then
		cat << __EOT

No /dev/MAKEDEV has been installed yet.
__EOT

	elif [ ! -d /mnt/etc -o ! -d /mnt/usr/share/zoneinfo -o ! -d /mnt/dev ]; then
		cat << __EOT

One or more of /etc, /usr/share/zoneinfo or /dev is missing. Did you
forget to extract a required set?
__EOT
	else
		return 0
	fi

	cat << __EOT

You will now be given the chance to install the missing set(s). You can
enter '!' at the prompt to escape to a shell and fix things by hand if you wish.

__EOT

	return 1
}

# Ask the user for locations of sets, and then install whatever sets the
# user selects from that location. Repeat as many times as the user
# needs to get all desired sets.
install_sets() {
 	cat << __EOT

You will now be asked for the location of the ${MODE} sets you want to
use, and then which sets to actually use. These steps will repeat
until you are satisfied that all the sets you want have been
loaded. Thus you will be able to load sets from multiple locations,
and you can recover from some errors.

__EOT

	while : ; do
		cat << __EOT
Sets can be located on a

	(m)ounted filesystem
	(c)drom, (d)isk or (t)ape device
	(f)tp, (n)fs or (h)ttp server

__EOT
		ask "Where are the ${MODE} sets you want to use? (m, c, f, etc.)"

		case $resp in
		c*|C*)	install_cdrom
			;;
		d*|D*)	install_disk
			;;
		f*|F*)	install_url ftp
			;;
		h*|H*)	install_url http
			;;
		m*|M*)	install_mounted_fs /mnt
			;;
		n*|N*)	install_nfs
			;;
		t*|T*)	install_tape
			;;
		*)	echo "Invalid response: $resp"
			;;
		esac

		# Give the user the opportunity to extract more sets.

		ask "\nExtract more sets?" n
		case $resp in
		n*|N*)	# Perform sanity checks...
			sane_install && break
			ask "\nDo you want to extract more sets?" y
			case $resp in 
			n*|N*)	break
				;;
			esac
			;;
		esac
	done
}

# Create a /etc/fstab from /tmp/fstab. Ensure /etc/fstab
#	1) contains only ffs filesystems
#	2) contains only filesystems without the 'noauto' option
#	3) contains no 'softdep' options
#	4) mounts all filesystems relative to /mnt
#
# If no /etc/fstab is created, do not proceed with install/upgrade.
munge_fstab() {
	local _dev _mp _fstype _opt _rest

	while read _dev _mp _fstype _opt _rest; do
		# Skip comment lines.
		case $_dev in
		\#*)	continue ;;
		esac

		# Skip noauto filesystems.
		case $_opt in
		*noauto*)
			continue ;;
		esac

		# Skip filesystems we can't mount.
		[ -f "/sbin/mount_${_fstype}" ] || continue

		# Remove any softdep options, as soft updates are not
		# available in the ramdisk kernels.
		_opt="$(echo ${_opt} | \
			sed -e 's/^softdep$//; s/^softdep,//; s/,softdep,/,/; s/,softdep$//;')"

		# Mount non-ffs filesystems read-only
		[ "$_fstype" = "ffs" ] || \
			_opt="$(echo ${_opt} | \
				sed -e 's/^rw$/ro/; s/^rw,/ro,/; s/,rw,/,ro,/; s/,rw$/,ro/')"

		# Avoid '/mnt/' in root fs entry in munged fstab
		[ "$_mp" = "/" ] && _mp=

		# Write fs entry in fstab.
		echo $_dev /mnt$_mp $_fstype $_opt $_rest

	done < /tmp/fstab > /etc/fstab
	
	# If no /etc/fstab was created, we have nowhere to ${MODE} to.
	if [ ! -s /etc/fstab ]; then
		echo "Unable to create valid /etc/fstab."
		exit
	fi
}

# Must mount filesystems manually, one at a time, so we can make
# sure the mount points exist.
mount_fs() {
	local _async=$1 _dev _mp _fstype _opt _rest

	while read _dev _mp _fstype _opt _rest; do
		# If not the root filesystem, make sure the mount
		# point is present.
		[ "$_mp" = "/mnt" ] || mkdir -p $_mp

		# Mount the filesystem. If the mount fails, exit.
		if ! mount -v -t $_fstype $_async -o $_opt $_dev $_mp ; then
			# In addition to the error message displayed by mount ...
			cat << __EOT

FATAL ERROR:	Cannot mount filesystems. Double-check your configuration
		and restart the ${MODE}.

__EOT
			exit
		fi
	done < /etc/fstab
}

# Script is exiting. Clean up as much as possible.
cleanup_on_exit() {
	echo "\nCleaning up..."

	# Kill any running dhclient, so a restart will not
	# find /dev/bpf0 busy.

	if [ -f /var/run/dhclient.pid ]; then
		echo "Stopping dhclient"
		kill -HUP `sed -ne "1p" /var/run/dhclient.pid` > /dev/null 2>&1
		rm -f /var/run/dhclient.pid
	fi

	if [ -f /etc/fstab ]; then
		umount -av
	elif [ ! "`df /`" = "`df /mnt`" ]; then
		umount -v /mnt
	fi

	echo "Done."
}

# Remount all filesystems in /etc/fstab with the options from
# /etc/fstab, i.e. without any options such as async which
# may have been used in the first mount.
remount_fs() {
	local _dev _mp _fstype _opt _rest

	while read _dev _mp _fstype _opt _rest; do
		mount -u -o $_opt $_dev $_mp ||	exit
	done < /etc/fstab
}

# Preen all filesystems in /etc/fstab that have a /sbin/fsck_XXX,
# showing individual results, but skipping $ROOTDEV. This was already
# fsck'ed successfully.
#
# Exit if any fsck's fail (but do them all before exiting!).
check_fs() {
	local _dev _mp _fstype _rest _badfsck=0 _root=$1

	echo "Checking non-root filesystems..."

	while read _dev _mp _fstype _rest; do
		[ "$_dev" != "$_root" ] || continue
		[ -f "/sbin/fsck_$_fstype" ] || continue
		echo -n "fsck -p ${_dev}..."
		if ! fsck -fp ${_dev} > /dev/null 2>&1; then
			echo "FAILED. You must fsck this device manually."
			_fail=y
		else
			echo "OK."
		fi
	done < /etc/fstab

	echo "...Done."

	[ "$_fail" ] && exit
}

# Find LAST instance of DOMAIN or SEARCH and extract first domain name
# on that line as FQDN. Then ask user, just to be sure.
# $1 = resolv.conf file to search for FQDN
# $2 = hosts file to add FQDN information to
get_fqdn() {
	if [ -f "$1" ]; then
		FQDN=`sed -n \
			-e '/^domain[[:space:]][[:space:]]*/{s///;s/\([^[:space:]]*\).*$/\1/;h;}' \
			-e '/^search[[:space:]][[:space:]]*/{s///;s/\([^[:space:]]*\).*$/\1/;h;}' \
			-e '${g;p;}' $1`
	fi

	if [ -f "$2" -a -n "$FQDN" ]; then
		# Add FQDN to hosts file entries created by addhostent, changing
		# lines like
		#    1.2.3.4 hostname
		# to
		#    1.2.3.4 hostname.$FQDN hostname
		sed "s/\\(.*\\)[[:space:]]\\(.*\\)\$/\\1 \\2.$FQDN \\2/" $2 > $2.new
		mv $2.new $2
	else
		ask "Enter DNS domain name (e.g. 'bar.com'):" "$FQDN"
		FQDN=$resp
	fi
}

donetconfig() {
	local _nam

	[ "$DIDNET" ] && return

	DIDNET=y

	_nam=
	[ -f /tmp/myname ] && _nam=`cat /tmp/myname`

	ask_until "Enter system hostname (short form, e.g. 'foo'):" "$_nam"
	hostname $resp
	echo $resp > /tmp/myname

	# Always create new hosts file. If install.sh has been
	# restarted, an existing one may contain information which
	# will conflict with the information about to be entered.
	# Also ensures logic to put FQDN in hosts file will create
	# hosts file lines in correct format.
	echo "::1 localhost\n127.0.0.1 localhost" > /tmp/hosts

	# Remove any existing hostname.* files. If install.sh has
	# been restarted, this ensures a correct list of configured
	# interfaces is displayed, and gives the user a chance to
	# change which interfaces are to be configured.
	rm -f /tmp/hostname.*

	# Revoke any previous decision on whether or not to use
	# a nameserver during installation.
	rm -f /tmp/resolv.conf.shadow

	cat << __EOT

If any interfaces will be configured using a DHCP server
it is recommended that you do not enter a DNS domain name,
a default route, or any name servers.

__EOT

	FQDN=
	get_fqdn /tmp/resolv.conf

	configure_all_interfaces

	# As dhclient will populate /etc/resolv.conf, a symbolic link to
	# /tmp/resolv.conf.shadow, mv any such file to /tmp/resolv.conf
	# so it will eventually be copied to /mnt/etc/resolv.conf and will
	# not in the meantime remove the user's ability to choose to use it
	# or not, during the rest of the install.
	if [ -f /tmp/resolv.conf.shadow ]; then
		mv /tmp/resolv.conf.shadow /tmp/resolv.conf
	fi

	# Get any DHCP supplied FQDN, and in any case apply FQDN to
	# the host names in /tmp/hosts, all without asking for any more
	# user confirmation. This means DHCP supplied information will
	# override a user supplied (or previous DHCP supplied) FQDN.
	get_fqdn /tmp/resolv.conf /tmp/hosts

	# Also add FQDN to myname
	if [ "$FQDN" ]; then
		sed "s/\\(.*\\)\$/\\1.${FQDN}/" /tmp/myname > /tmp/myname.new
		mv /tmp/myname.new /tmp/myname
	fi

	resp=`route -n show | sed -ne '/^default */{
		s///
		s/ .*//
		p
	}'`
	if [ -z "$resp" ] ; then
		resp=none
		if [ -f /tmp/mygate ]; then
			resp=`cat /etc/mygate`
			: ${_resp:=none}
		fi
	fi
	ask "Enter IP address of default route:" "$resp"
	if [ "$resp" != "none" ]; then
		route delete default > /dev/null 2>&1
		if route add default $resp > /dev/null ; then
			echo $resp > /tmp/mygate
		fi
	fi

	resp=none
	if [ -f /tmp/resolv.conf ]; then
		resp=
		for n in `sed -ne '/^nameserver /s///p' /tmp/resolv.conf`
			do
			if [ -z "$resp" ] ; then
				resp=$n
			else
				resp="$resp $n"
			fi
		done
	fi
	ask "Enter IP address of primary nameserver:" "$resp"
	if [ "$resp" != "none" ]; then
		echo "search $FQDN" > /tmp/resolv.conf
		for n in `echo ${resp}`; do
			echo "nameserver $n" >> /tmp/resolv.conf
		done
		echo "lookup file bind" >> /tmp/resolv.conf

		ask "Would you like to use the nameserver now?" y
		case $resp in
		y*|Y*)	cp /tmp/resolv.conf /tmp/resolv.conf.shadow
			;;
		esac
	fi

	if [ ! -f /tmp/resolv.conf.shadow ]; then
		echo "\nThe host table is as follows:\n"
		cat /tmp/hosts
	cat << __EOT

You may want to edit the host table in the event that you are doing an
NFS installation or an FTP installation without a name server and want
to refer to the server by name rather than by its numeric ip address.
__EOT
		ask "Would you like to edit the host table with ${EDITOR}?" n
		case $resp in
		y*|Y*)	${EDITOR} /tmp/hosts
			;;
		esac
	fi

	cat << __EOT

You will now be given the opportunity to escape to the command shell to do
any additional network configuration you may need. This may include adding
additional routes, if needed. In addition, you might take this opportunity
to redo the default route in the event that it failed above.
__EOT
	ask "Escape to shell?" n
	case $resp in
	y*|Y*)	echo "Type 'exit' to return to install."
		sh
		;;
	esac
}

populateusrlocal() {
	if [ -f /mnt/etc/mtree/BSD.local.dist ]; then
		/mnt/usr/sbin/chroot /mnt /usr/sbin/mtree -Uedqn -p /usr/local -f /etc/mtree/BSD.local.dist >/dev/null
	fi
}

set_machdep_apertureallowed() {
	[ "$MDXAPERTURE" ] || return

	ask "\nDo you expect to run the X Window System?" y
	case $resp in
	y*|Y*)
		sed -e "/^#\(machdep\.allowaperture=${MDXAPERTURE}\)/s//\1	/" \
			/mnt/etc/sysctl.conf > /tmp/sysctl.conf
		echo "machdep.allowaperture enabled in /etc/sysctl.conf. Read xf86(4) for details."
		;;
	esac
}

finish_up() {
	set_timezone

	echo -n "Making all device nodes (by running /dev/MAKEDEV all) ..."
	cd /mnt/dev
	sh MAKEDEV all
	echo "... done."
	cd /

	md_installboot $ROOTDISK

	populateusrlocal

	# XXXXX - what is this for?
	[ -x /mnt/${MODE}.site ] && /mnt/usr/sbin/chroot /mnt /${MODE}.site

	# Unmount filesystems, etc. Disable trap that would do same on exit.
	# Do this manually rather than through the trap so congrats is
	# the last message printed.
	trap - HUP INT QUIT TERM EXIT
	cleanup_on_exit

	# Pat on the back.
	cat << __EOT

CONGRATULATIONS! Your OpenBSD ${MODE} has been successfully completed!
To boot the new system, enter halt at the command prompt. Once the
system has halted, reset the machine and boot from the disk.
__EOT

	md_congrats
}

# #######################################################################
#
# Initial actions common to both installs and upgrades.
#
# Some may require machine dependent routines, which may
# call functions defined above, so it's safest to put this
# code here rather than at the top of the file.
#
# #######################################################################

ROOTDISK=
ROOTDEV=
VERSION=31
VERSION_MAJOR=$(( $VERSION / 10 ))
VERSION_MINOR=$(( $VERSION % 10 ))
export VERSION VERSION_MAJOR VERSION_MINOR

# Extract and save one boot's worth of dmesg
dmesg | sed -ne '/^OpenBSD /h;/^OpenBSD /!H;${g;p;}' > /var/run/dmesg.boot

# Scan /var/run/dmesg.boot for disks and cds
DKDEVS=`get_dkdevs`
CDDEVS=`get_cddevs`
IFDEVS=`get_ifdevs`

# extra "site" set can be provided by person doing install or upgrade.
THESETS="base etc misc comp man game xbase xshare xfont xserv site $MDSETS"

# Global variable using during sets installation
SETS=
SETSDIR=
SETSDONE=
GET_FILES=

# decide upon an editor
if [ -z "$EDITOR" ] ; then
	EDITOR=ed
	[ -x /usr/bin/vi ] && EDITOR=vi
	export EDITOR
fi

# Cleanup when the script exits.
trap 'cleanup_on_exit' EXIT
trap 'exit 2' HUP INT QUIT TERM

# Good {morning,afternoon,evening,night}.
welcome_banner | more

if [ -f /etc/fstab -a "$MODE" = "install" ]; then
	cat << __EOT

You seem to be trying to restart an interrupted installation!
You can skip the disk preparation steps and continue,
or you can reboot and start over.

__EOT
	echo -n "Skip disk initialization and p"
else
	echo -n "\nP"
fi
	
ask "roceed with ${MODE}?" n
case $resp in
y*|Y*)	echo "\nCool!  Let's get to it...\n"
	;;
*)	cat << __EOT

Enter 'halt' at the prompt to gracefully exit OpenBSD. You can then
power cycle the machine and boot your original OS.
__EOT
	exit
	;;
esac

# Deal with terminal issues
set_term