#	$OpenBSD: install.sub,v 1.812 2015/01/24 00:20:35 krw Exp $
#
# Copyright (c) 1997-2009 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.
#
# 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.
#
# 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

usage() {
	echo "usage: ${0##*/} [-a] [-f filename]" >&2
	exit 1
}

# Parse parameters
AUTO=false
RESPFILE=
while getopts "af:" opt; do
	case $opt in
	a)	AUTO=true;;
	f)	RESPFILE=$OPTARG;;
	*)	usage;;
	esac
done
shift $((OPTIND-1))
[ $# = 0 ] || usage

# 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()	  - put an OpenBSD disklabel on the disk
#	md_consoleinfo()	  - set CDEV, CTTY, CSPEED, CPROM
#
# The following variables can be provided if required:
#	MDSETS	    - list of files to add to THESETS
#	MDTERM      - 'vt220' assumed if not provided
#	MDDKDEVS    - '/^[sw]d[0-9][0-9]* /s/ .*//p' assumed if not provided
#	MDCDDEVS    - '/^cd[0-9][0-9]* /s/ .*//p'    assumed if not provided
#	MDMTDEVS    - '/^[cms]t[0-9][0-9]* /s/ .*//p'
#	MDXAPERTURE - set machdep.allowaperture=value in sysctl.conf
#	NCPU	    - the number of cpus for mp capable arches
. install.md

set_term() {
	local _layouts

	export TERM=${TERM:-${MDTERM:-vt220}}
	if [[ -n $CONSOLE ]]; then
		ask "Terminal type?" $TERM
		export TERM=$resp
	else
		[[ -x /sbin/kbd ]] || return
		_layouts=$(bsort $(kbd -l | egrep -v "^(user|tables|encoding)"))
		while :; do
			ask "Choose your keyboard layout ('?' or 'L' for list)" "default"
			case $resp in
			"?"|L|l) echo "Available layouts: $_layouts";;
			default) return;;
			*)	kbd $resp && { echo $resp >/tmp/kbdtype; return; };;
			esac
		done
	fi
}

# Echo the file $1 to standard output, skipping any lines that begin with a
# '#'. i.e. strip comment lines from the file.
stripcom () {
	local _l

	[[ -f $1 ]] || return

	set -o noglob
	while read _l; do
		[[ -n ${_l%%#*} ]] && echo $_l
	done <$1
	set +o noglob
}

# Prints the supplied parameters properly escaped for future sh/ksh parsing.
# Quotes are added if needed, so you should not do that yourself.
quote() (
	# Since this is a subshell we won't pollute the calling namespace
	for a; do
		alias Q=$a; a=$(alias Q); print -rn -- " ${a#Q=}"
	done | sed '1s/ //'
	echo
)

# Create a temporary directory based on the supplied directory name prefix.
tmpdir() {
	local _i=1 _dir
	until _dir="${1?}.$_i.$RANDOM" && mkdir -- "$_dir" 2>/dev/null; do
		((++_i < 10000)) || return 1
	done
	echo "$_dir"
}

scan_dmesg() {
	bsort $(sed -n "$1" /var/run/dmesg.boot)
}

scan_disknames() {
	local IFS=,
	bsort $(for _n in $(sysctl -n hw.disknames); do echo "${_n%%:*} "; done | sed -n "$1")
}

get_dkdevs () {
	echo $(scan_disknames "${MDDKDEVS:-/^[sw]d[0-9][0-9]* /s/ .*//p}")
}

get_cddevs () {
	echo $(scan_disknames "${MDCDDEVS:-/^cd[0-9][0-9]* /s/ .*//p}")
}

get_ifdevs() {
	local _if _iflist=$(rmel vlan $(ifconfig -C))

	for _if in $(ifconfig "$@" 2>/dev/null |
		sed -n 's/^\([^[:space:]]*\):.*/\1/p'); do
		isin ${_if%%+([0-9])} $_iflist || echo $_if
	done
}

get_drive() {
	ask_which "$1" "contains the $MODE media" "$2" "$3"
	[[ $resp == done ]] && return 1
	makedev $resp || return 1
	return 0
}

mount_mnt2() {
	local _dev=$1 _opts _file=/tmp/parts.$1 _parts

	disklabel $_dev 2>/dev/null |
		sed -En '/swap|unused/d;/^  [a-p]: /p' >$_file

	_parts=$(sed 's/^  \(.\): .*/\1/' $_file)
	set -- $_parts
	(($# == 0)) && { echo "No filesystems found on $_dev."; return 1; }

	if isin "c" $_parts; then
		# Don't ask questions if 'c' contains a filesystem.
		resp=c
	elif (($# == 1)); then
		# Don't ask questions if there's only one choice.
		resp=$1
	else
		# Display partitions with filesystems and ask which to use.
		cat $_file
		ask_which "$_dev partition" "has the $MODE sets" \
			'$(disklabel '$_dev' 2>/dev/null |
			sed -En '\''/swap|unused/d;/^  ([a-p]): .*/s//\1/p'\'')'
		[[ $resp == done ]] && return 1
	fi

	# Always mount msdos partitions with -s to get lower case names.
	grep -q "^  $resp: .*MSDOS" $_file && _opts="-s"
	mount -o ro,$_opts /dev/$_dev$resp /mnt2
}

# 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.
#    *Don't* interpret "\" as escape character.
#    Preserve whitespace in input
askpass() {
	stty -echo
	IFS= read -r resp?"$1 "
	stty echo
	echo
}

# Make sure lock is initially released
rm -df /tmp/lock

# Acquire lock
lock() {
	while ! mkdir /tmp/lock 2>/dev/null && sleep .1; do done
}

# Release lock
unlock() {
	rm -d /tmp/lock 2>/dev/null
}

# Add trap to kill the listener process
retrap() {
	trap 'kill -KILL $cppid 2>/dev/null; echo; stty echo; exit 0' \
		INT EXIT TERM
}

# The dmesg listener will check for the existance of this file and send a
# signal to the child process if the dmesg output differs from the contents
# of that file
rm -f /tmp/update

if ! $AUTO; then
	# Start listener process looking for dmesg changes
	(
		while :; do
			lock
			if test -e /tmp/update && [[ "`dmesg`" != "`cat /tmp/update`" ]]; then
				dmesg >/tmp/update
				kill -TERM 2>/dev/null $$ || exit 1
			fi
			unlock
			sleep .5
		done
	) |&
	cppid=$!

	# Kill the child on exit
	retrap
fi

# Issue a read into the global variable $resp. If the dmesg output is
# changed while inside this function, the current read will be aborted
# and the function will return a non-zero value. Normally, the caller
# will then reprint any prompt and call the function again.
#
# Optional parameters:
#    $1    = the question to ask the user
#    $2    = the default answer
#
_ask() {
	local _q=$1 _def=$2 _int _redo=0 _pid

	lock; dmesg >/tmp/update; unlock
	echo -n "${_q:+$_q }${_def:+[$_def] }"
	_autorespond "$_q" "$_def" && echo "$resp" && return
	trap "_int=1" INT
	trap "_redo=1" TERM
	read resp
	lock; rm /tmp/update; unlock
	if ((_redo)); then
		stty raw
		stty -raw
	else
		case $resp in
		!)	echo "Type 'exit' to return to install."
			sh
			_redo=1
			;;
		!*)	eval "${resp#?}"
			_redo=1
			;;
		esac
	fi
	retrap
	((_int)) && kill -INT $$
	: ${resp:=$_def}
	return $_redo
}

# Search question in $RESPFILE, return answer in $resp
#
# - split question and answer at leftmost =
# - strip leading/trailing blanks
# - compare questions case insensitive
# - ignore empty and comment lines and lines without =
# - return default answer if provided and none is found in file
# - treat empty/missing/multiple answers as error and exit
#
# $1 = the question to search for
# $2 = the default answer
#
_autorespond() {
	typeset -l _q=$1 _key
	local _def=$2 _l _val
	[[ -f $RESPFILE ]] || return
	# Find a suitable response in /ai.conf and remove it if found.
	mv /ai.conf /ai.conf.tmp
	while IFS=' 	' read -r _l; do
		[[ $_l == [!#=]*=?* ]] || continue
		_key=${_l%%*([[:blank:]])=*}
		_val=${_l##*([!=])=*([[:blank:]])}
		[[ $_q == @(|*[[:blank:]])"$_key"@([[:blank:]?]*|) ]] &&
			resp=$_val && cat && return
		print -r " $_l"
	done </ai.conf.tmp >/ai.conf
	[[ -n $_def ]] && resp=$_def && return
	echo "\nQuestion has no answer in response file."
	exit 1
}

# Ask for user input, which is returned in $resp.
# Any parameters are passed on to _ask(), which is called
# repeatedly until it succeds.
ask() {
	while ! _ask "$1" "$2"; do done
}

# Ask for a password twice, saving the input in $_password
askpassword() {
	local _q=$1
	if $AUTO; then
		echo -n "$_q "
		_autorespond "$_q"
		echo '<provided>'
		_password=$resp
		return
	fi

	while :; do
		askpass "$_q (will not echo)"
		_password=$resp

		askpass "$_q (again)"
		[[ $resp == "$_password" ]] && break

		echo "Passwords do not match, try again."
	done
}

encr_pwd() {
	local _p=$1
	if [[ -z $_p ]]; then
		echo '*'
	elif [[ $_p == \$2?\$[0-9][0-9]\$* && ${#_p} > 40 ||
		$_p == '*************' ]]; then
		echo "$_p"
	else
		encrypt -b a -- "$_p"
	fi
}

user_setup() {
	local _q="Setup a user? (enter a lower-case loginname, or 'no')"

	while :; do
		ask "$_q" no
		case $resp in
		n|no)	return;;
		y|yes)	_q="No really, what is the lower-case loginname, or 'no'?"
			continue;;
		root|daemon|operator|bin|smmsp|popa3d) ;;
		sshd|uucp|www|named|proxy|nobody|ftp) ;;
		[a-z]*([a-z0-9_]))
			((${#resp} <= 31)) && break;;
		esac
		echo "$resp is not a useable loginname."
	done
	user=$resp
	while :; do
		ask "Full name for user $user?" $user
		case $resp in
		*[:\&,]*)
			echo "':', '&' or ',' are not allowed.";;
		*)
			((${#resp} <= 100)) && break
			echo "Too long.";;
		esac
	done
	username=$resp

	askpassword "Password for user $user?"
	userpass=$_password

	userkey=
	$AUTO && ask "Public ssh key for user $user" none &&
		[[ $resp != none ]] && userkey=$resp

	if [[ $sshd == y ]]; then
		ask_yn "Since you set up a user, disable sshd(8) logins to root?" yes
		sshd_disableroot=$resp
	fi

}

# 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.
function ask_until {
	resp=
	while true; do
		ask "$1" "$2"
		[[ -n $resp ]] && break
		echo "A response is required."
		$AUTO && exit 1
	done
}

# Ask the user for a y or n, and insist on 'y', 'yes', 'n' or 'no'.
#
#    $1    = the question to ask the user
#    $2    = the default answer (assumed to be 'n' if empty).
#
# Return 'y' or 'n' in $resp.
# Exit code: yes => 0, no => 1
ask_yn() {
	local _q=$1 _a=${2:-no}
	typeset -l _resp

	while :; do
		ask "$_q" "$_a"
		_resp=$resp
		case $_resp in
		y|yes)	resp=y; return 0;;
		n|no)	resp=n; return 1;;
		esac
		echo "'$resp' is not a valid choice."
		$AUTO && exit 1
	done
}

# Ask for the user to select one value from a list, or 'done'.
#
# $1 = name of the list items (disk, cd, etc.)
# $2 = question to ask
# $3 = list of valid choices
# $4 = default choice, if it is not specified use the first item in $3
#
# N.B.! $3 and $4 will be "expanded" using eval, so be sure to escape them
#       if they contain spooky stuff
#
# At exit $resp holds selected item, or 'done'
ask_which() {
	local _name=$1 _query=$2 _list=$3 _def=$4 _dynlist _dyndef _key _q

	_key=$(echo "$_name" | sed 's/[^[:alnum:]]/_/g')

	while :; do
		eval "_dynlist=\"$_list\""
		eval "_dyndef=\"$_def\""

		# Clean away whitespace and determine the default
		set -o noglob
		set -- $_dyndef; _dyndef="$1"
		set -- $_dynlist; _dynlist="$*"
		set +o noglob
		(($# < 1)) && resp=done && return

		: ${_dyndef:=$1}
		echo "Available ${_name}s are: $_dynlist."
		_q="Which $_name $_query?"
		echo -n "$_q (or 'done') ${_dyndef:+[$_dyndef] }"
		_autorespond "$_q" "${_dyndef-done}" && echo "$resp" \
			|| _ask || continue
		[[ -z $resp ]] && resp="$_dyndef"

		# Quote $resp to prevent user from confusing isin() by
		# entering something like 'a a'.
		isin "$resp" $_dynlist done && break
		echo "'$resp' is not a valid choice."
		$AUTO && [[ -n $RESPFILE ]] && exit 1
	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

	shift

	echo -n "$*"
	isin "$_a" $* || echo -n " $_a"
}

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

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

bsort() {
	local _l _a=$1 _b

	(($# > 0)) || return

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

	# Output the smallest value found.
	echo -n "$_a "

	# Sort remaining values.
	bsort $_l
}

# show a list (passed via ordered arguments) in column output using ls
showcols() {
	local _l _cdir=/tmp/cdir
	set -A _clist
	mkdir -p $_cdir
	rm -rf -- $_cdir/*
	while read _l; do
		[[ -n $_l ]] || continue
		mkdir -p /tmp/cdir/"$_l"
		_clist[${#_clist[*]}]="$_l"
	done
	(cd $_cdir; ls -Cdf "${_clist[@]}")
	rm -rf -- $_cdir
}

# Create devices passed as arguments
makedev() {
	[[ -z $(cd /dev && sh MAKEDEV "$@" 2>&1) ]]
}

# Create an entry in the hosts file. If an entry with the
# same symbolic name and address family already exists, delete it.
# $1 - IP address (v6 if it contains ':', else v4)
# $2 - symbolic name
addhostent() {
	local _addr=$1 _name=$2 _delim="."

	[[ -z $_addr || -z $_name ]] && return

	[[ $_addr == *:* ]] && _delim=":"

	sed "/^[0-9a-fA-F]*[$_delim].*[ 	]$_name\$/d" /tmp/hosts \
		>/tmp/hosts.new 2>/dev/null
	mv /tmp/hosts.new /tmp/hosts

	echo "$_addr $_name" >>/tmp/hosts
}

# Show list of available sets and let the user select which sets to install.
#
# $1 = available sets
# $2 = already selected sets
#
# Set $resp to list of selected sets.
select_sets() {
	local _avail=$1 _selected=$2 _f _action _col=$COLUMNS
	# account for 4 spaces added to the sets list
	let COLUMNS=_col-8

	cat <<__EOT

Select sets by entering a set name, a file name pattern or 'all'. De-select
sets by prepending a '-' to the set name, file name pattern or 'all'. Selected
sets are labelled '[X]'.
__EOT
	while :; do
		for _f in $_avail; do
			isin $_f $_selected && echo "[X] $_f" || echo "[ ] $_f"
		done | showcols | sed 's/^/    /'
		ask "Set name(s)? (or 'abort' or 'done')" done

		set -o noglob
		for resp in $resp; do
			case $resp in
			abort)	_selected=; break 2;;
			done)	break 2;;
			-*)	_action=rmel;;
			*)	_action=addel;;
			esac
			resp=${resp#[+-]}
			[[ $resp = all ]] && resp=*

			for _f in $_avail; do
				[[ $_f = $resp ]] && _selected=$($_action $_f $_selected)
			done
		done
	done

	set +o noglob
	COLUMNS=$_col

	resp=$_selected
}

configure_ifs() {
	local _first _ifdevs _ifs _name _hn _vl=0 _vd _vi _p _tags

	# In case of restart, discover last vlan configured.
	while :; do
		_vd=$(ifconfig vlan$_vl 2>&1)
		[[ $_vd == @(*no such interface*) ]] && break
		[[ $_vd == @(*vlan: +([[:digit:]]) parent interface:*) ]] || break
		((_vl++))
	done
	_vd=

	# Always need lo0 configured.
	ifconfig lo0 inet 127.0.0.1/8

	# In case of restart, delete previous default gateway config.
	rm -f /tmp/mygate

	while :; do
		# Create new vlan if possible.
		ifconfig vlan$_vl create >/dev/null 2>&1

		ask_which "network interface" "do you wish to configure" \
			'$(get_ifdevs)' \
			${_p:-'$( (get_ifdevs netboot; get_ifdevs) | sed q )'}
		[[ $resp == done ]] && break

		_ifs=$resp
		_hn=/tmp/hostname.$_ifs
		rm -f $_hn

		# If the offered vlan is chosen, ask the relevant
		# questions and bring it up
		if [[ $_ifs == vlan+([0-9]) ]]; then
			# Get existing tag for this vlan.
			_vi=$(ifconfig $_ifs 2>/dev/null |
				sed -n 's/vlan: \([0-9]*\).*/\1/p')
			# Get list of all in-use tags.
			_tags=$(ifconfig vlan 2>/dev/null |
				sed -n 's/vlan: \([0-9]*\).*/\1/p')
			# Current tag is a valid tag for this vlan.
			[[ -n $_tags ]] && _tags=$(rmel "$_vi" $_tags)
			if [[ -z $_vi ]]; then
				_vi=0
				while ((++_vi < 4096)); do
					! isin "$_vi" $_tags && break
				done
			fi
			_ifdevs=$(get_ifdevs)
			set -- $_ifdevs
			while [[ $1 == vlan+([0-9]) ]]; do
				shift
			done
			ask "Which interface:tag should $_ifs be on?" "${_vd:=$1}:$_vi"
			_vd=${resp%%:*}
			_vi=${resp##*:}

			# Validate that $_vd is a real interface
			if ! (isin "$_vd" $_ifdevs && [[ $_vd != vlan+([0-9]) ]]); then
				echo "Invalid interface choice '$_vd'"
				_vd=
				continue
			fi

			# Validate range of $_vi as 1-4095, and $_vi not in use.
			if ((_vi < 1 || _vi > 4095)) || isin "$_vi" $_tags; then
				echo "Invalid or in-use vlan tag '$_vi'"
				continue
			fi

			# hostname.$_vd must say something, anything, to
			# make sure it is up.
			grep -qs "^up" /tmp/hostname.$_vd ||
				echo "up" >>/tmp/hostname.$_vd
			chmod 640 /tmp/hostname.$_vd
			ifconfig $_vd up

			# Make sure a hostname.$_ifs is created with this info.
			ifconfig $_ifs destroy >/dev/null 2>&1
			ifconfig $_ifs vlan $_vi vlandev $_vd
			echo "vlan $_vi vlandev $_vd" >>$_hn
			# Create a new vlan if we just configured the highest.
			[[ ${_ifs##vlan} == $_vl ]] && ((_vl++))
		fi

		# Test if it is an 802.11 interface
		ifconfig $_ifs 2>/dev/null | grep -q "^[[:space:]]*ieee80211:" &&
			ieee80211_config $_ifs $_hn

		# First interface configured will use the hostname without
		# asking the user.
		resp=$(hostname -s)
		[[ -n $_first && $_first != $_ifs ]] &&
			ask "Symbolic (host) name for $_ifs?" $resp
		_name=$resp

		v4_config $_ifs $_name $_hn
		v6_config $_ifs $_name $_hn

		if [[ -f $_hn ]]; then
			chmod 640 $_hn
			: ${_first:=$_ifs}
		fi

		NIFS=$(ls -1 /tmp/hostname.* 2>/dev/null | grep -c ^)
		_p=done
	done
}

# Output '<UP | DOWN> [<addr> <netmask> <rest of inet line>]'.
#
# $1 == interface
v4_info() {
	ifconfig $1 inet | sed -n '
		1s/.*<UP,.*/UP/p
		1s/.*<.*/DOWN/p
		/inet/s/netmask//
		/inet/s///p'
}

# Obtain and output the inet6 information related to the given
# interface. Should output '<UP/DOWN> <addr> <prefixlen> <rest of inet line> '.
#
# $1 == interface
v6_info() {
	ifconfig $1 inet6 | sed -n '
		1s/.*<UP,.*/UP/p
		1s/.*<.*/DOWN/p
		/scopeid/d
		/inet6/s/prefixlen//
		/inet6/s///p'
}

# Run dhclient, making sure there is a free bpf first
dhclient() {
	local _i=0
	while makedev bpf$_i && ! </dev/bpf$_i; do
		((++_i < 50)) || return
	done 2>/dev/null
	/sbin/dhclient "$@"
}

# Issue a DHCP request to configure interface $1 and add the host-name option to
# /etc/dhclient.conf using $2.
dhcp_request() {
	local _ifs=$1 _hn=$2

	echo "lookup file bind" >/etc/resolv.conf.tail
	echo "send host-name \"$_hn\";" >/etc/dhclient.conf

	ifconfig $_ifs group dhcp >/dev/null 2>&1

	dhclient -c /dev/stdin $_ifs << __EOT
initial-interval 1;
backoff-cutoff 2;
reboot 5;
timeout 10;
send host-name "$_hn";
__EOT

	# Move configuration files to where they will be copied to the
	# installed system. Overwrites configuration information from
	# last successful dhcp attempt.
	mv /etc/dhclient.conf /tmp/dhclient.conf
	mv /etc/resolv.conf.tail /tmp/resolv.conf.tail
}

# Convert a hex value to dotted decimal format
hextodec() {
	local _d _b

	for _b in $(echo ${1#0x} | sed 's/\(..\)/\1 /g'); do
		_d=$_d.$((0x$_b))
	done
	echo ${_d#.}
}

# Perform an 802.11 interface network scan.
# The result is cached in $WLANLIST
# $1 == interface
ieee80211_scan() {
	# N.B. Skipping quoted nwid's for now
	[[ -f $WLANLIST ]] ||
		ifconfig $1 scan |
		sed -n 's/^		nwid \([^"]\)/\1/p' >$WLANLIST
	cat $WLANLIST
}

# Configures an 802.11 interface
#
# $1 == interface
# $2 == hostname
ieee80211_config() {
	local _ifs=$1 _hn=$2 _prompt _nwid _haswpa=0 _err

	# Reset 802.11 settings and determine wpa capability
	ifconfig $_ifs -nwid -nwkey
	ifconfig $_ifs -wpa 2>/dev/null && _haswpa=1

	# Empty scan cache
	rm -f $WLANLIST

	while [[ -z $_nwid ]]; do
		ask_until "Access point? (ESSID, 'any', list# or '?')" "any"
		case "$resp" in
		+([0-9]))
			_nwid=$(ieee80211_scan $_ifs | sed -n "${resp}s/ .*//p")
			[[ -z $_nwid ]] && echo "There is no line $resp."
			;;
		\?)	ieee80211_scan $_ifs |
				sed -n 's/^\([^ ]*\) chan .* bssid \([^ ]*\) .*$/	\1 (\2)/p' |
				less -XEN
			;;
		*)	_nwid=$resp;;
		esac
	done

	# 'any' implies that only open access points are considered
	if [[ $_nwid != any ]]; then
		ifconfig $_ifs nwid "$_nwid"
		quote nwid "$_nwid" >>$_hn

		_prompt="Security protocol? (O)pen, (W)EP"
		((_haswpa == 1)) && _prompt="$_prompt, WPA-(P)SK"
		while :; do
			ask_until "$_prompt" "O"
			case "$_haswpa-$resp" in
			?-[Oo])	break
				;;
			?-[Ww])	ask_until "WEP key? (will echo)"
				# Make sure ifconfig accepts the key
				if _err=$(ifconfig $_ifs nwkey "$resp" 2>&1) &&
					[[ -z $_err ]]; then
					quote nwkey "$resp" >>$_hn
					break
				fi
				echo "$_err"
				;;
			1-[Pp])	ask_until "WPA passphrase? (will echo)"
				# Make sure ifconfig accepts the key
				if ifconfig $_ifs wpakey "$resp"; then
					quote wpakey "$resp" >>$_hn
					break
				fi
				;;
			*)	echo "'$resp' is not a valid choice."
				;;
			esac
		done
	fi
}

v4_config() {
	local _ifs=$1 _name=$2 _hn=$3 _prompt _addr _mask

	if ifconfig $_ifs | grep -q 'groups:.* dhcp'; then
		_addr=dhcp
	else
		set -- $(v4_info $_ifs)
		if [[ -n $2 ]]; then
			_addr=$2; _mask=$(hextodec $3)
			ifconfig $_ifs inet $_addr delete
		fi
	fi

	if [[ -x /sbin/dhclient ]]; then
		_prompt="or 'dhcp' "
		# Don't make 'dhcp' the default if dhcp was already used.
		ifconfig dhcp >/dev/null 2>&1 || _addr=dhcp
	fi
	_prompt="IPv4 address for $_ifs? (${_prompt}or 'none')"

	ask_until "$_prompt" "$_addr"
	case $resp in
	none)	;;
	dhcp)	if [[ ! -x /sbin/dhclient ]]; then
			echo "DHCP not possible - no /sbin/dhclient."
		else
			dhcp_request $_ifs "$_name"
			echo "dhcp" >>$_hn
		fi
		;;
	*)	_addr=$resp
		ask_until "Netmask for $_ifs?" "${_mask:=255.255.255.0}"
		ifconfig $_ifs -group dhcp >/dev/null 2>&1
		if ifconfig $_ifs inet $_addr netmask $resp up; then
			addhostent "$_addr" "$_name"
			echo "inet $_addr $resp" >>$_hn
		fi
		;;
	esac
}

v6_config() {
	local _ifs=$1 _name=$2 _hn=$3 _addr _prefixlen _prompt

	ifconfig lo0 inet6 >/dev/null 2>&1 || return

	set -- $(v6_info $_ifs)
	[[ -n $2 ]] && { _addr=$2; _prefixlen=$3; }

	ifconfig $_ifs inet6 >/dev/null 2>&1 && _prompt="or 'rtsol' "
	_prompt="IPv6 address for $_ifs? (${_prompt}or 'none')"
	ask_until "$_prompt" "${_addr:-none}"

	case $resp in
	none)	return
		;;
	rtsol)	ifconfig $_ifs inet6 >/dev/null 2>&1 || { echo "No INET6 support."; return; }
		ifconfig $_ifs up
		ifconfig $_ifs inet6 autoconf && echo "up\nrtsol" >>$_hn
		return
		;;
	esac

	_addr=$resp
	ask_until "IPv6 prefix length for $_ifs?" "${_prefixlen:=64}"
	ifconfig $_ifs inet6 $_addr prefixlen $resp up || return
	echo "inet6 $_addr $resp" >>$_hn
	addhostent "$_addr" "$_name"

	v6_defroute $_ifs
}

v4_defroute() {
	local _dr _prompt=" or 'none'"

	# Get/Confirm an IPv4 default route if an IPv4 address was configured.
	[[ -n $(ifconfig | sed -n '/[ 	]inet .* broadcast /p') ]] || return

	# If only one interface, and it is running dhclient, ask nothing
	[[ -f /tmp/dhclient.conf && $NIFS == 1 ]] && return

	[[ -x /sbin/dhclient ]] && _prompt=", 'dhcp'$_prompt"
	_prompt="Default IPv4 route? (IPv4 address$_prompt)"

	_dr=$(route -n show -inet | sed -n '/^default */{s///; s/ .*//; p;}')
	[[ -f /tmp/dhclient.conf ]] && _dr=dhcp

	while :; do
		ask_until "$_prompt" "$_dr"
		[[ $resp == @(none|dhcp) ]] && break
		route delete -inet default >/dev/null 2>&1
		route -n add -inet -host default "$resp" && { echo "$resp" >>/tmp/mygate; break; }
		# Put the old default route back. The new one did not work.
		route -n add -inet -host default $_dr >/dev/null 2>&1
	done
}

v6_defroute() {
	local _if=$1 _prompt _resp _routers

	route -n show -inet6 | egrep -q '^default[[:space:]]' && return

	_routers=$(bsort $(ping6 -n -c 2 ff02::2%$_if 2>/dev/null |
		sed -n '/bytes from/{s/^.*from //;s/,.*$//;p;}' |
		sed -n 'G;s/\n/&&/;/^\(.*\n\).*\n\1/d;h;P'))

	_prompt="IPv6 default router?"

	if $AUTO; then
		_autorespond "$_prompt" && _resp=$resp && echo "$_prompt $_resp"
	else
		local PS3="$_prompt (${_routers:+list #, }IPv6 address or 'none'): "
		select _resp in $_routers; do
			[[ ${_resp:=$REPLY} == *:* ]] && break
			[[ $_resp == none ]] && return
		done
	fi

	route -n add -inet6 -host default "$_resp" &&
		echo "$_resp" >>/tmp/mygate
}

# Much of this is gratuitously stolen from /etc/netstart.
ifstart () {
	local _hn=$1 if=${1#/mnt/etc/hostname.}

	((NIFS++))
	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
		# $af can be "dhcp", "rtsol", an address family,
		# commands, or a comment.
		case "$af" in
		"#"*|"!"*|"bridge"|"")
			# skip comments, user commands, bridges,
			# and empty lines
			continue
			;;
		"dhcp")	[ "$name" = "NONE" ] && name=
			[ "$mask" = "NONE" ] && mask=
			[ "$bcaddr" = "NONE" ] && bcaddr=
			dhcpif="$dhcpif $if"
			cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 down"
			if [[ -x /sbin/dhclient ]]; then
				cmd="$cmd; dhclient $if"
			else
				cmd="$cmd; echo /sbin/dhclient missing - skipping dhcp request."
			fi
			;;
		"rtsol")
			if ifconfig $if inet6 >/dev/null 2>&1; then
				rtsolif="$rtsolif $if"
				cmd="ifconfig $if $name $mask $bcaddr $ext1 $ext2 up"
			else
				cmd="$cmd; echo no INET6 support - skipping rtsol request."
			fi
			;;
		*)	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 $dtaddr"
				;;
			*)
				cmd2="$dt $dtaddr"
				;;
			esac
			case $af in
			inet)
				if [ ! -n "$name" ]; then
					echo "/etc/hostname.$if: inet alone is invalid"
					return
				fi
				[ "$mask" ] && cmd="$cmd netmask $mask"
				if [ "$bcaddr" -a X"$bcaddr" != "XNONE" ]; then
					cmd="$cmd broadcast $bcaddr"
				fi
				[ "$alias" ] && rtcmd=";route -qn add -host $name 127.0.0.1"
				;;
			inet6)
				if [ ! -n "$name" ]; then
					echo "/etc/hostname.$if: inet6 alone is invalid"
					return
				fi
				[ "$mask" ] && cmd="$cmd prefixlen $mask"
				cmd="$cmd $bcaddr"
				;;
			*)	cmd="$cmd $mask $bcaddr"
				;;
			esac
			cmd="$cmd $ext1 $ext2$rtcmd" rtcmd=
			;;
		esac
		eval "$cmd"
	done <$_hn
}

enable_network() {
	local _f _gw _trunks _svlans _vlans

	# Copy any network configuration files. N.B.: hosts already copied.
	for _f in dhclient.conf resolv.conf resolv.conf.tail; do
		if [ -f /mnt/etc/$_f ]; then
			cp /mnt/etc/$_f /etc/$_f
		fi
	done

	# Set the address for the loopback interface. Bringing the
	# interface up, automatically invokes the IPv6 address ::1.
	ifconfig lo0 inet 127.0.0.1/8

	# 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 prefix to get interface name.
		if=${hn#/mnt/etc/hostname.}
		if isin ${if%%+([0-9])} $(ifconfig -C); then
			# Dynamic interfaces must be done later.
			case ${if%%+([0-9])} in
			trunk)	_trunks="$_trunks $hn"	;;
			svlan)	_svlans="$_svlans $hn"	;;
			vlan)	_vlans="$_vlans $hn"	;;
			esac
		else
			# 'real' interfaces (if available) are done now.
			ifconfig $if >/dev/null 2>&1 && ifstart $hn
		fi
	done
	# Configure any dynamic interfaces now that 'real' ones are up.
	# ORDER IS IMPORTANT! (see /etc/netstart)
	for hn in $_trunks $_svlans $_vlans; do
		ifstart $hn
	done

	[[ -n $rtsolif ]] && ifconfig $rtsolif inet6 autoconf

	# /mnt/etc/mygate, if it exists, contains the address(es) of my
	# default gateway(s). Use for ipv4 if no interfaces configured via
	# dhcp. Use for ipv6 if no interfaces configured via rtsol.
	[[ -z $dhcpif ]] && stripcom /mnt/etc/mygate | while read _gw; do
		[[ $_gw == @(*:*) ]] && continue
		route -qn delete default >/dev/null 2>&1
		route -qn add -host default $_gw && break
	done
	[[ -z $rtsolif ]] && stripcom /mnt/etc/mygate | while read _gw; do
		[[ $_gw == !(*:*) ]] && continue
		route -qn delete -inet6 default >/dev/null 2>&1
		route -qn add -host -inet6 default $_gw && break
	done

	route -qn add -net 127 127.0.0.1 -reject >/dev/null
}

# Install a user-selected subset of the files in $2 from the source
# named in $1. Display an error message for failed installs so the
# user will know to try again.
install_files() {
	local _src=$1 _files=$2 _f _sets _get_sets _n _col=$COLUMNS \
		_tmpfs _tmpsrc _cfile _fsrc _unver _t _issue _srclocal

	# Initialize _sets to the list of sets found in _src, and initialize
	# _get_sets to the intersection of _sets and DEFAULTSETS.
	#
	# Sets will be installed in the order given in THESETS to ensure proper
	# installation.  So, to minimize user confusion display the sets in the
	# order in which they will be installed.
	for _f in $THESETS; do
		isin $_f $_files || continue;
		_sets=$(addel $_f $_sets)
		# No displays and X isn't installed ==> skip X sets
		[[ -z $DISPLAY && ! -d /mnt/etc/X11 ]] &&
			isin ${_f%${VERSION}.tgz} xbase xshare xfont xserv &&
			continue
		isin $_f $DEFAULTSETS "site$VERSION-$(hostname -s).tgz" &&
			_get_sets=$(addel $_f $_get_sets)
	done

	if [[ -z $_sets ]]; then
		echo -n "Looked at $_src "
		echo "and found no $OBSD sets.  The set names looked for were:"

		let COLUMNS=_col-8
		for _n in $THESETS; do echo $_n; done | showcols | sed 's/^/    /'
		COLUMNS=$_col

		$AUTO && exit 1
		echo
		return
	fi

	isin INSTALL.$ARCH $_files ||
		ask_yn "INSTALL.$ARCH not found. Use sets found here anyway?" ||
		return

	select_sets "$_sets" "$_get_sets"

	[[ -n $resp ]] || return
	_get_sets=$resp

	# Reorder $_get_sets
	_get_sets=$(for s in $THESETS; do isin $s $_get_sets && echo $s; done)

	# Note which sets didn't verify ok
	_unver=$_get_sets

	# Try to prefetch and control checksum files
	# use dummy for loop as combined assignment and do { ... } while(0)
	for _issue in ''; do
		! isin SHA256.sig $_files &&
			_issue="Directory does not contain SHA256.sig" && break

		# Find a filesystem to store the prefetched sets. Prefer file-
		# systems which are not used during extraction. They need to
		# have 512 MB free space. Otherwise use any other filesystem
		# having 2 GB free space to prevent overflow during extraction.
		_tmpfs=$( (
			for fs in /mnt/{{,var/}tmp,home,usr{/local,}}; do
				df -k $fs 2>/dev/null | grep " $fs\$"
			done
			df -k
		) | (
			while read a a a a m m; do
				[[ $m == /mnt/@(@(|var/)tmp|home|usr/@(src,obj,xobj))@(|/*) ]] &&
					((a > 524288)) && echo $m && exit
				[[ $m == /mnt@(|/*) ]] &&
					((a > 524288 * 4)) && echo $m && exit
			done
		) )

		if [[ -d $_tmpfs ]]; then
			! _tmpsrc=$(tmpdir "$_tmpfs/sets") &&
			_issue="Cannot create prefetch area" && break
		else
			_issue="Cannot determine prefetch area" && break
		fi

		_cfile=$_tmpsrc/SHA256
		_srclocal=false
		_t=Get/Verify
		[[ $_src == file://* ]] && _srclocal=true _t='Verifying '

		# Fetch signature file
		! ftp -D "$_t" -Vmo "$_cfile.sig" "$_src/SHA256.sig" &&
			_issue="Cannot fetch SHA256.sig" && break

		# Verify signature file with public keys
		! signify -Vep /etc/signify/openbsd-${VERSION}-base.pub \
			-x "$_cfile.sig" -m "$_cfile" &&
			_issue="Signature check of SHA256.sig failed" && break

		for _f in $_get_sets; do
			rm -f "$_tmpsrc/h" "$_tmpsrc/fail"

			# Fetch set and create checksum by pipe through sha256
			# Create a flag file in case ftp failed. Sets from net
			# are written to prefetch area, the output of local sets
			# is discarded.
			( ftp -D "$_t" -Vmo - "$_src/$_f" || >"$_tmpsrc/fail" ) |
			( $_srclocal && sha256 >$_tmpsrc/h ||
				sha256 -ph "$_tmpsrc/h" >"$_tmpsrc/$_f" )

			# Handle failed transfer.
			if [[ -f $_tmpsrc/fail ]]; then
				rm -f "$_tmpsrc/$_f"
				if ! ask_yn "Fetching of $_f failed. Continue anyway?"; then
					[[ -d $_tmpsrc ]] && rm -rf "$_tmpsrc"
					$AUTO && exit 1
					return
				fi
				continue
			fi

			# Verify sets by comparing its checksum with SHA256.
			if fgrep -qx "SHA256 ($_f) = $(<$_tmpsrc/h)" "$_cfile"; then
				_unver=$(rmel $_f $_unver)
			else
				if ! ask_yn "Checksum test for $_f failed. Continue anyway?"; then
					[[ -d $_tmpsrc ]] && rm -rf "$_tmpsrc"
					$AUTO && exit 1
					return
				fi
			fi
		done
	done

	[[ -n $_unver ]] && : ${_issue:="Unverified sets:" ${_unver% }}
	if [[ -n $_issue ]] &&
		! ask_yn "$_issue. Continue without verification?"; then
		[[ -d $_tmpsrc ]] && rm -rf "$_tmpsrc"
		$AUTO && exit 1
		return
	fi

	# XXX Delete this chunk after 5.8 (not a supported upgrade path)
	# XXX Undo old configurations where /var/tmp is a directory
	[[ $MODE == upgrade ]] && rm -rf /mnt/var/tmp

	for _f in $_get_sets; do
		_fsrc="$_src/$_f"
		[[ -f $_tmpsrc/$_f ]] && _fsrc="file://$_tmpsrc/$_f"
		case $_fsrc in
		*.tgz)	ftp -D Installing -Vmo - "$_fsrc" | tar -zxphf - -C /mnt
			if [[ $_f == ?(x)base*.tgz && $MODE == install ]]; then
				ftp -D Extracting -Vmo - \
				file:///mnt/usr/share/sysmerge/${_f%%base*}etc.tgz |
				tar -zxphf - -C /mnt
			fi;;
		*)	ftp -D Installing -Vmo "/mnt/$_f" "$_fsrc";;
		esac
		if (($?)); then
			if ! ask_yn "Installation of $_f failed. Continue anyway?"; then
				[[ -d $_tmpsrc ]] && rm -rf "$_tmpsrc"
				$AUTO && exit 1
				return
			fi
		else
			DEFAULTSETS=$(rmel $_f $DEFAULTSETS)
			GOTSETS="$GOTSETS $_f"
		fi
		[[ -d $_tmpsrc ]] && rm -f "$_tmpsrc/$_f"
	done
	[[ -d $_tmpsrc ]] && rm -rf "$_tmpsrc"
}

startcgiinfo() {
	# If no networks are configured, we do not need the httplist file
	((NIFS < 1)) && return

	# Make sure the ftp subshell gets its own process group
	set -m
	(
		# ftp.openbsd.org == 129.128.5.191 and will remain at
		# that address for the foreseeable future.
		ftp -Vao - "http://129.128.5.191/cgi-bin/ftplist.cgi?path=$HTTP_SETDIR" \
			2>/dev/null >$CGI_INFO

		# Remember finish time for adjusting the received timestamp
		echo -n $SECONDS >$HTTP_SEC
		feed_random
	) & CGIPID=$!
	set +m

	# If the ftp process takes more than 12 seconds, kill it
	# XXX We are relying on the pid space not randomly biting us --
	# XXX ftp could terminate early, and the pid could be reused
	(sleep 12; kill -INT -$CGIPID >/dev/null 2>&1) &
}

# Wait for the http process to finish, or be killed after the timeout
waitcgiinfo() {
	wait "$CGIPID" 2>/dev/null
	[[ -s $CGI_INFO ]] || return

	sed -n "s,^http://"'\([[A-Za-z0-9\:_][]A-Za-z0-9:._-]*\),\1,p' \
		$CGI_INFO >$HTTP_LIST 2>/dev/null
	set -- $(sed q $HTTP_LIST)
	: ${HTTP_SERVER:=${1%%/*}}

	CGI_METHOD=$(sed -n '/^method=/s///p' $CGI_INFO 2>/dev/null)
	CGI_TZ=$(sed -n '/^TZ=/s///p' $CGI_INFO 2>/dev/null)
	CGI_TIME=$(sed -n '/^TIME=/s///p' $CGI_INFO 2>/dev/null)
}

# If possible, print the timestamp received from the ftplist.cgi output,
# adjusted with the time elapsed since it was received
http_time() {
	local _sec=$(cat $HTTP_SEC 2>/dev/null)

	[[ -n $_sec && -n $CGI_TIME ]] &&
		echo $((CGI_TIME + SECONDS - _sec))
}

# Get several parameters from the user, and xfer files from the http server.
install_http() {
	local _file_list _prompt _mirror _url_base

	waitcgiinfo
	# N.B.: 'http_proxy' is an environment variable used by ftp(1). DON'T
	# change the name or case!
	ask "HTTP proxy URL? (e.g. 'http://proxy:8080', or 'none')" \
		"${http_proxy:-none}"
	unset http_proxy
	[[ $resp == none ]] || export http_proxy=$resp

	if [[ -s $HTTP_LIST ]]; then
		_prompt="HTTP Server? (hostname, list#, 'done' or '?')"
	else
		echo "(Unable to get list from ftp.openbsd.org, but that is OK)"
		_prompt="HTTP Server? (hostname or 'done')"
	fi

	# Get server IP address or hostname
	while :; do
		ask_until "$_prompt" "$HTTP_SERVER"
		case $resp in
		done)	return;;
		"?")	[[ -s $HTTP_LIST ]] || continue
			less -XEN < $HTTP_LIST
			;;
		+([0-9]))
			# A numeric hostname is ignored. A number is only used
			# as a line number in $HTTP_LIST.
			[[ -s $HTTP_LIST ]] || continue
			set -- $(sed -n "${resp}p" $HTTP_LIST)
			(($# < 1)) && { echo "There is no line $resp."; continue; }
			HTTP_SERVER=${1%%/*}
			# Repeat loop to get user to confirm server address.
			;;
		+([A-Za-z0-9\:.\[\]_-]))
			HTTP_SERVER=$resp
			break
			;;
		*)	echo "'$resp' is not a valid hostname."
			;;
		esac
	done

	# Get directory info from *last* line starting with the server
	# name. This means the last install from a mirror will not keep
	# the specific directory info. But an install from a local
	# server *will* remember the specific directory info.
	set -- $(sed "/^$HTTP_SERVER/x;\$!d;x" $HTTP_LIST 2>/dev/null)
	resp=${1#*/}
	# If there is no directory specified, don't use the server name!
	[[ $resp == "$1" ]] && resp=
	if (($# > 1)); then
		# It's a mirror, since it has location info.
		resp=$resp/$HTTP_SETDIR
		_mirror=yes
	fi

	: ${HTTP_DIR:=pub/OpenBSD/$HTTP_SETDIR}
	ask_until "Server directory?" "${resp:-$HTTP_DIR}"
	HTTP_DIR=$resp
	_url_base="http://$HTTP_SERVER/$HTTP_DIR"

	# Get list of files from the server.
	# Assumes index file is "index.txt" for http (or proxy)
	# We can't use index.html since the format is server-dependent
	_file_list=$(ftp -Vo - "$_url_base/index.txt" |
		sed 's/^.* //' | sed 's/
//')

	install_files "$_url_base" "$_file_list"

	# Remember where we installed from, to tell the cgi server.
	INSTALL=$_url_base

	# Bake a package path only if we installed from a mirror.
	PACKAGE_PATH=
	if [[ -n $_mirror ]]; then
		PACKAGE_PATH=$(print -r -- "$_url_base" |
			sed -E "/\/(snapshots|[0-9]\.[0-9])\/($ARCH)\/*$/!d
				s!!/\1/packages/$(arch -s)/!;q")
	fi
}

install_mounted_fs() {
	local _dir

	while :; do
		ask_until "Pathname to the sets? (or 'done')" "$SETDIR"
		[[ $resp == done ]] && return
		# Accept a valid /mnt2 or /mnt relative path.
		[[ -d /mnt2/$resp ]] && { _dir=/mnt2/$resp; break; }
		[[ -d /mnt/$resp ]] && { _dir=/mnt/$resp; break; }
		# Accept a valid absolute path.
		[[ -d /$resp ]] && { _dir=/$resp; break; }
		echo "The directory '$resp' does not exist."
		$AUTO && exit 1
	done

	install_files "file://$_dir" "$(ls $_dir/)"
}

install_cdrom() {
	get_drive "CD-ROM" '$(get_cddevs)' || return
	mount_mnt2 $resp || return

	install_mounted_fs
}

install_disk() {
	if ! ask_yn "Is the disk partition already mounted?"; then
		get_drive "disk" '$(bsort $(get_dkdevs))' \
			'$(bsort $(rmel $ROOTDISK $(get_dkdevs)))' || return
		mount_mnt2 $resp || return
	fi

	install_mounted_fs
}

install_nfs() {
	local _tcp

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

	# Get the server path to mount.
	ask_until "Filesystem on server to mount?" "$NFS_PATH"
	NFS_PATH=$resp

	# Determine use of TCP
	ask_yn "Use TCP transport? (requires TCP-capable NFS server)" && _tcp=-T

	# Mount the server
	mount_nfs $_tcp -o ro -R 5 $NFS_ADDR:$NFS_PATH /mnt2 || return

	install_mounted_fs
}

set_timezone() {
	local _zonefile=$1 _zonepath _zsed _tz _zoneroot=/usr/share/zoneinfo

	# If the timezone file is not available,
	# return immediately.

	[[ ! -f $_zonefile ]] && return

	# If configured in a previous call, return immediately
	[[ -n $TZ ]] && return

	if [[ -h /mnt/etc/localtime ]]; then
		TZ=$(ls -l /mnt/etc/localtime 2>/dev/null)
		TZ=${TZ#*${_zoneroot#/mnt}/}
	fi

	waitcgiinfo
	if [[ -n $CGI_TZ ]]; then
		_tz=$CGI_TZ
		[[ -n $_tz ]] && isin "$_tz" `cat $_zonefile` && TZ=$_tz
	fi

	# If neither the base or HTTP_LIST gave a hint, and this is the
	# early question, give up, and ask after the sets are installed
	[[ $_zonefile = /var/tzlist && -z $TZ ]] && return

	while :; do
		ask "What timezone are you in? ('?' for list)" "$TZ"
		_zonepath=${resp%%*(/)}
		case $_zonepath in
		"")	continue;;
		"?")	grep -v /. $_zonefile | showcols
			continue;;
		esac

		while isin "$_zonepath/" $(cat $_zonefile); do
			ask "What sub-timezone of '$_zonepath' are you in? ('?' for list)"
			_zsed=$(echo $_zonepath/ | sed 's,/,\\/,g')
			resp=${resp%%*(/)}
			case $resp in
			"")	;;
			"?")	sed -n "/^$_zsed/{s/$_zsed//;/\/./!p;}" $_zonefile | showcols;;
			*)	_zonepath=$_zonepath/$resp;;
			esac
		done

		if isin "$_zonepath" $(cat $_zonefile); then
			TZ=${_zonepath#$_zoneroot}
			return
		fi

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

# Check that missing required sets were deliberately skipped.
# Care is taken to make sure the return value is correct.
sane_install() {
	local _q=$1 _s

	for _s in $SANESETS; do
		isin $_s $DEFAULTSETS || continue
		[[ -n $_q ]] && return 1
		# If sane_install has no argument, harass the user.
		if ! ask_yn "Are you *SURE* your $MODE is complete without '$_s'?"; then
			$AUTO && exit 1 || return 1
		fi
	done
}

# 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() {
	local _d _locs="disk http"

	echo

	_d=$CGI_METHOD

	ifconfig netboot >/dev/null 2>&1 && : ${_d:=http}
	[[ -n $(get_cddevs) ]] && { _locs="cd $_locs"; : ${_d:=cd}; }
	[[ -x /sbin/mount_nfs ]] && _locs="$_locs nfs"
	: ${_d:=http}

	if ! isin "$_d" $_locs; then
		for a in http cd nfs disk; do
			isin $a $_locs && _d=$a && break
		done
	fi

	echo "Let's $MODE the sets!"
	while :; do
		umount -f /mnt2 >/dev/null 2>&1

		ask "Location of sets? ($_locs or 'done')" "$_d"
		case $resp in
		done)	sane_install && return;;
		c*|C*)	isin cd $_locs && install_cdrom && METHOD=cd;;
		d*|D*)	install_disk && METHOD=disk;;
		h*|H*)	isin http $_locs && install_http && METHOD=http;;
		n*|N*)	isin nfs $_locs && install_nfs && METHOD=nfs;;
		*)	$AUTO && echo "'$resp' is not a valid choice." && exit 1;;
		esac

		[[ -n $METHOD ]] && _d=$METHOD
		sane_install quiet || $AUTO && _d=done
	done
}

update_firmware() {
	echo "/usr/sbin/fw_update -v" >>/mnt/etc/rc.firsttime
}

# Create a skeletal but useful /etc/fstab from /tmp/fstab by stripping all
# comment lines and dropping all filesystems which
#
#	1) can't be mounted (no mount_* command is found),
#	2) have 'xx' in the option field (usually /altroot),
#	3) have 'noauto' in the option field,
#	4) are nfs (since name resolution may not be present),
#	5) are on a vnd device.
#
# In addition,
#
#	1) delete 'softdep' options (no soft updates in ramdisk kernels),
#	2) mount non-ffs filesystems read only,
#	3) prepend '/mnt' to all mount points,
#	4) delete any trailing '/' from the mount point (e.g. root),
#
# 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
		# Drop irrelevant lines and filesystems.
		[[ $_dev == @(/dev/vnd*|\#*) ||
			$_fstype == nfs ||
			! -f /sbin/mount_$_fstype ||
			$_opt == *noauto* ||
			$_opt == *xx* ]] && continue

		# Remove any softdep options, as soft updates are not
		# available in the ramdisk kernels.
		_opt=$(echo $_opt | sed 's/softdep//')

		# Change read-only ffs to read-write since we'll potentially
		# write to these filesystems.
		[[ $_fstype == ffs ]] && _opt=$(echo $_opt | sed 's/ro/rw/')

		# Mount non-ffs filesystems read only.
		[[ $_fstype == ffs ]] || _opt=$(echo $_opt | sed 's/rw/ro/')

		# Write fs entry in fstab.
		# 1) prepend '/mnt' to the mount point.
		# 2) remove a trailing '/' from the mount point (e.g. root).
		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 _msg _fail

	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. Remember any failure.
		_msg=$(mount -v -t $_fstype $_async -o $_opt $_dev $_mp) ||
			_fail="$_fail\n$_mp ($_dev)"
		echo $_msg | sed 's/, ctime=[^,)]*//'
	done </etc/fstab

	if [[ -n $_fail ]]; then
		# One or more mounts failed. Continue or abort?
		echo "\nWARNING! The following filesystems were not properly mounted:$_fail"
		ask_yn "Continue anyway?" || exit
	fi
}

# Return the device name for the supplied device, which may be a disklabel UID.
getdevname() {
	local _dev=$1
	if [[ ${#_dev} == 18 && $_dev == +([0-9a-f]).[a-p] ||
		${#_dev} == 16 && $_dev == +([0-9a-f]) ]]; then
		# Lookup device name matching the disklabel UID
		sysctl -n hw.disknames |
			sed -nE "s/^(.*,)*(.*):${_dev%.?}.*/\\2/p"
	else
		_dev=${_dev#/dev/}
		print -r -- "${_dev%[a-p]}"
	fi
}

# Preen all filesystems in /etc/fstab that have a /sbin/fsck_XXX and a
# fs_passno > 0, 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 _dn _mp _fstype _rest _fail _f _passno

	ask_yn "Force checking of clean non-root filesystems?" && _f=f

	while read _dev _mp _fstype _rest _rest _passno _rest; do
		_dn=$(getdevname "$_dev")
		[[ $ROOTDEV == @(${_dev#/dev/}|$_dn${_dev##*.}) ]] && continue
		[[ -f /sbin/fsck_$_fstype ]] || continue
		# Make sure device exists before fsck'ing it.
		makedev "$_dn" || continue
		((_passno > 0)) || continue
		echo -n "fsck -${_f}p $_dev..."
		if ! fsck -${_f}p $_dev >/dev/null 2>&1; then
			echo "FAILED. You must fsck $_dev manually."
			_fail=y
		else
			echo "OK."
		fi
	done </etc/fstab

	[[ -n $_fail ]] && exit
}

# Extract fully qualified domain name from current hostname. If none is
# currently set, use 'my.domain'.
get_fqdn() {
	local _dn

	_dn=$(hostname)
	_dn=${_dn#$(hostname -s)}
	_dn=${_dn#.}

	echo "${_dn:=my.domain}"
}

donetconfig() {
	local _dn _ns _n

	configure_ifs
	v4_defroute

	# 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
		# Get nameserver address(es). Store as a blank separated list.
		for _n in $(grep '^nameserver ' /tmp/resolv.conf); do
			[[ $_n == nameserver ]] || _ns="$_ns$_n "
		done
		# Zap trailing space in _ns.
		set -- $_ns
		_ns=$*
		# Get default fully qualified domain name from *first* domain
		# given on *last* search or domain statement.
		_dn=$(sed -n \
			-e '/^domain[[:space:]][[:space:]]*/{s///;s/\([^[:space:]]*\).*$/\1/;h;}' \
			-e '/^search[[:space:]][[:space:]]*/{s///;s/\([^[:space:]]*\).*$/\1/;h;}' \
			-e '${g;p;}' /tmp/resolv.conf)
	fi

	# Get & apply fully qualified domain name to hostname.
	resp="${_dn:=$(get_fqdn)}"
	if [[ ! -f /tmp/dhclient.conf || $NIFS != 1 ]]; then
		ask "DNS domain name? (e.g. 'bar.com')" "$resp"
	else
		echo "Using DNS domainname $resp"
	fi
	hostname "$(hostname -s).$resp"

	# If only one interface, and it is running dhclient, ask nothing
	# else Get/Confirm nameservers
	resp="${_ns:=none}"
	if [[ ! -f /tmp/dhclient.conf || $NIFS != 1 || $resp == none ]]; then
		ask "DNS nameservers? (IP address list or 'none')" "$resp"
	else
		echo "Using DNS nameservers at $resp"
	fi
	# Construct appropriate resolv.conf.
	if [[ $resp != none ]]; then
		echo "lookup file bind" >/tmp/resolv.conf
		for _ns in $resp; do
			echo "nameserver $_ns" >>/tmp/resolv.conf
		done
		cp /tmp/resolv.conf /tmp/resolv.conf.shadow
	fi
}

apply()
{
	[[ $sshd == n ]] && echo "sshd_flags=NO" >>/mnt/etc/rc.conf.local
	if [[ $sshd_disableroot == y ]]; then
		sed "/^#\(PermitRootLogin\) yes/s//\1 no/" \
			< /mnt/etc/ssh/sshd_config >/tmp/sshd_config
		cp /tmp/sshd_config /mnt/etc/ssh/sshd_config
	fi
	if [[ $ntpd == y ]]; then
		echo "ntpd_flags=" >>/mnt/etc/rc.conf.local
		[[ $ntpd_server == default ]] && ntpd_server=pool.ntp.org
		echo "servers ${ntpd_server%% *}" >>/mnt/etc/ntpd.conf
	fi

	[[ -n $aperture ]] &&
		echo "machdep.allowaperture=$aperture # See xf86(4)" \
			>>/mnt/etc/sysctl.conf

	[[ $xdm == y && -x /mnt/usr/X11R6/bin/xdm ]] &&
		echo "xdm_flags=" >>/mnt/etc/rc.conf.local

	if [[ $defcons == y ]]; then
		cp /mnt/etc/ttys /tmp/ttys
		sed	-e "/^$CTTY/s/std.9600/std.${CSPEED}/" \
			-e "/^$CTTY/s/unknown/vt220	/" \
			-e "/$CTTY/s/off.*/on secure/" /tmp/ttys >/mnt/etc/ttys
		[[ -n $CPROM ]] &&
			echo "stty $CPROM $CSPEED\nset tty $CPROM" >>/mnt/etc/boot.conf
	fi

	ln -sf /usr/share/zoneinfo/$TZ /mnt/etc/localtime
}

questions() {
	local _d _cdef=no

	ask_yn "Start sshd(8) by default?" yes
	sshd=$resp

	ask_yn "Start ntpd(8) by default?"
	ntpd=$resp
	if [[ $resp == y ]]; then
		ask "NTP server? (hostname or 'default')" default
		ntpd_server=$resp
	fi

	aperture=
	xdm=
	if [[ -n $DISPLAY ]]; then
		if [[ -n $(scan_dmesg '/^[a-z]*[01]: aperture needed/p') ]]; then
			ask_yn "Do you expect to run the X Window System?" yes &&
				aperture=$MDXAPERTURE
		fi
		if [[ -n $MDXDM ]]; then
			ask_yn "Do you want the X Window System to be started by xdm(1)?"
			xdm=$resp
		fi
	fi

	if [[ -n $CDEV ]]; then
		_d=${CPROM:-$CDEV}
		[[ -n $CONSOLE ]] && _cdef=yes
		ask_yn "Change the default console to $_d?" $_cdef
		defcons=$resp
		if [[ $resp == y ]]; then
			ask_which "speed" "should $_d use" \
				"9600 19200 38400 57600 115200" $CSPEED
			case $resp in
			done)	defcons=n;;
			*)	CSPEED=$resp;;
			esac
		fi
	fi
}

# Feed the random pool some entropy before we read from it
feed_random() {
	(dmesg; cat $CGI_INFO /*.conf; sysctl; route -n show; df;
		ifconfig -A; hostname) >/dev/random 2>&1
	if [[ -e /mnt/var/db/host.random ]]; then
		dd if=/mnt/var/db/host.random of=/dev/random bs=65536 count=1 \
			status=none
	fi
}

store_random() {
	dd if=/dev/random of=/mnt/var/db/host.random bs=65536 count=1 \
		status=none
	dd if=/dev/random of=/mnt/etc/random.seed bs=512 count=1 status=none
	chmod 600 /mnt/var/db/host.random /mnt/etc/random.seed
}

finish_up() {
	local _dev _mp _fstype _rest

	# Mount all known swap partitions.  This gives systems with little
	# memory a better chance at running 'MAKEDEV all'.
	if [[ -x /mnt/sbin/swapctl ]]; then
		/mnt/sbin/swapctl -a /dev/$SWAPDEV >/dev/null 2>&1
		# Can't do chmod && swapctl -A because devices are not yet
		# created on install'ed systems. On upgrade'ed system there
		# is a small chance the device does not exist on the ramdisk
		# and will thus not get mounted.
		while read _dev _mp _fstype _rest; do
			[[ $_fstype == swap ]] &&
				/mnt/sbin/swapctl -a $_dev >/dev/null 2>&1
		done </mnt/etc/fstab
	fi

	# Create or update pkg.conf with the new package path, if any
	if [[ -n $PACKAGE_PATH ]]; then
		grep -v '^[ 	]*installpath[ 	]*=' /mnt/etc/pkg.conf 2>/dev/null >/tmp/pkgconf
		print -r -- "installpath = $PACKAGE_PATH" >>/tmp/pkgconf
		cp /tmp/pkgconf /mnt/etc/pkg.conf
	fi

	echo -n "Making all device nodes..."
	(cd /mnt/dev; sh MAKEDEV all
		# Make sure any devices we found during probe are created in the
		# installed system.
		for _dev in $(get_dkdevs) $(get_cddevs) $MTDEVS; do
			sh MAKEDEV $_dev
		done
	)
	echo "done."

	# We may run some programs in chroot, and some of them might be
	# dynamic.  That is highly discouraged, but let us play it safe.
	rm -f /mnt/var/run/ld.so.hints

	[[ -x /mnt/$MODE.site ]] && /mnt/usr/sbin/chroot /mnt /$MODE.site

	# In case this is a softraid device, make sure all underlying
	# device nodes exist.
	makedev $(bioctl $ROOTDISK 2>/dev/null | sed -n 's/.*<\(.*\)>$/\1/p')
	md_installboot $ROOTDISK

	if [[ -f /mnt/bsd.mp ]] && ((NCPU > 1)); then
		echo "Multiprocessor machine; using bsd.mp instead of bsd."
		mv /mnt/bsd /mnt/bsd.sp 2>/dev/null
		mv /mnt/bsd.mp /mnt/bsd
	fi

	update_firmware

	store_random

	# Pat on the back.
	cat <<__EOT

CONGRATULATIONS! Your OpenBSD $MODE has been successfully completed!
To boot the new system, enter 'reboot' at the command prompt.
__EOT
	[[ $MODE == install ]] && cat <<__EOT
When you login to your new system the first time, please read your mail
using the 'mail' command.
__EOT

	md_congrats
	[[ $MODE == upgrade ]] && \
		echo "After rebooting, run sysmerge(8) to update your system configuration."
	$AUTO && >/ai.done
}

# #######################################################################
#
# 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=
PACKAGE_PATH=

SETDIR="$VNAME/$ARCH"
CGI_INFO=/tmp/cgiinfo
CGI_TZ=
CGI_TIME=
CGI_METHOD=
INSTALL=
METHOD=
HTTP_DIR=
HTTP_SEC=/tmp/httpsec
HTTP_LIST=/tmp/httplist
WLANLIST=/tmp/wlanlist
FSTABFLAG=-f

# Do not limit ourselves during installs or upgrades.
for _opt in d f l m n p s; do
	ulimit -$_opt unlimited
done

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

# Are we in a real release, or a snapshot?  If this is a snapshot
# install media, default us to a snapshot directory.
HTTP_SETDIR=$SETDIR
set -- $(scan_dmesg "/^OpenBSD $VNAME\([^ ]*\).*$/s//\1/p")
[[ $1 == -!(stable) ]] && HTTP_SETDIR=snapshots/$ARCH

# Scan /var/run/dmesg.boot for interesting devices.
MTDEVS=$(scan_dmesg "${MDMTDEVS:-/^[cms]t[0-9][0-9]* /s/ .*//p}")
NIFS=0
DISPLAY=$(scan_dmesg '/^wsdisplay[0-9]* /s/ .*//p')

CONSOLE=$(scan_dmesg '/^\([^ ]*\).*: console$/s//\1/p')
CONSOLE=${CONSOLE% }
[[ -n $CONSOLE ]] && CSPEED=$(stty speed </dev/console)

# Look for the serial device matching the console. If we are not installing
# from a serial console, just find the first serial device that could be used
# as a console. If a suitable device is found, set CDEV, CTTY, CSPEED, CPROM.
md_consoleinfo

# Selected sets will be installed in the order they are listed in $THESETS.
# Ensure that siteXX.tgz is the *last* set listed so its contents overwrite
# the contents of the other sets, not the other way around.
THESETS="bsd bsd.rd bsd.mp $MDSETS"
: ${DEFAULTSETS:="bsd bsd.rd"}
for _set in base comp man game xbase xshare xfont xserv site; do
	THESETS="$THESETS ${_set}${VERSION}.tgz"
	isin $_set site && continue
	DEFAULTSETS="$DEFAULTSETS ${_set}${VERSION}.tgz"
done
SANESETS="${SANESETS:-bsd} base${VERSION}.tgz"

# prepare COLUMNS sanely
COLUMNS=$(stty -a </dev/console | sed -n '/columns/{s/^.* \([0-9]*\) columns.*$/\1/;p;}')
((COLUMNS == 0)) && COLUMNS=80

# decide upon an editor
: ${EDITOR:=ed}
[[ -x /usr/bin/vi ]] && EDITOR=vi
export EDITOR COLUMNS

# umount all filesystems, just in case we are re-running install or upgrade.
cd /
umount -af 1>/dev/null 2>&1

# make sure only successful dhcp requests retain their state
for _ifs in $(get_ifdevs dhcp); do
	set -- $(v4_info $_ifs)
	[[ $1 == UP && -n $2 ]] && continue
	ifconfig $_ifs delete down -group dhcp 2>/dev/null
done

# Fetch response file for autoinstall.
get_responsefile() {
	local _rf _ifdev _mac _mode _server _lf
	action=

	[[ -f /auto_upgrade.conf ]] && _rf=/auto_upgrade.conf _mode=upgrade
	[[ -f /auto_install.conf ]] && _rf=/auto_install.conf _mode=install
	[[ -f $_rf ]] && cp $_rf /ai.$_mode.conf && action=$_mode && return

	# Select a network interface for initial dhcp request.
	# Ask if multiple were found and system was not netbooted.
	# Extract server ip address and installer mode from lease file.
	# Prime hostname with host-name option.
	for _ifdev in ''; do
		[[ -x /sbin/dhclient ]] || break
		set -- $(get_ifdevs netboot)
		(($# == 0)) && set -- $(get_ifdevs)
		(($# == 1)) && _ifdev=$1
		while (($# > 1)); do
			ask_which "network interface" \
				"should be used for the initial DHCP request" "$*"
			isin "$resp" $* && _ifdev=$resp && break
		done
		[[ -n $_ifdev ]] && dhclient $_ifdev || break
		_lf=/var/db/dhclient.leases.$_ifdev
		_server=$(sed "/^ *next-server /!d;s///;s/;$//;q" $_lf)
		_mode=$(sed -E '/^ *filename "auto_(install|upgrade)";$/!d;s//\1/;q' $_lf)
		hostname "$(sed -E '/^ *option host-name "(.*)";$/!d;s//\1/;q' $_lf)"
	done

	# Fetch response file if server and mode are known, otherwise tell which
	# one was missing. First try to fetch mac-mode.conf, then mode.conf.
	if [[ -n $_server && -n $_mode ]]; then
		_mac=$(ifconfig $_ifdev | sed 's/.*lladdr \(.*\)/\1/p;d')
		for _rf in {$_mac-,}$_mode; do
			_url=http://$_server/$_rf.conf
			echo "Fetching $_url"
			if ftp -Vo "/ai.$_mode.conf" "$_url" 2>/dev/null; then
				action=$_mode
				ifconfig $_ifdev delete down 2>/dev/null
				return 0
			fi
		done
	else
		[[ -z $_server ]] && echo "Could not determine next-server."
		[[ -z $_mode ]] && echo "Could not determine auto mode."
	fi

	# Ask for url or local path to response file. Provide a default url if
	# server was found in lease file.
	while :; do
		ask "Response file location?" \
			"${_server:+http://$_server/install.conf}"
		[[ -n $resp ]] && _rf=$resp && break
	done

	# Ask for the installer mode only if auto-detection failed.
	_mode=$(echo "$_rf" | sed -En 's/^.*(install|upgrade).conf$/\1/p')
	while [[ -z $_mode ]]; do
		ask "(I)nstall or (U)pgrade?"
		[[ $resp == [iI]* ]] && _mode=install
		[[ $resp == [uU]* ]] && _mode=upgrade
	done

	echo "Fetching $_rf"
	[[ -f $_rf ]] && _rf="file://$_rf"
	ftp -Vo "/ai.$_mode.conf" "$_rf" 2>/dev/null && action=$_mode
	ifconfig $_ifdev delete down 2>/dev/null
	[[ -n $action ]]
}

# Interactive or automatic installation?
if ! $AUTO; then
	cat <<__EOT
At any prompt except password prompts you can escape to a shell by
typing '!'. Default answers are shown in []'s and are selected by
pressing RETURN.  You can exit this program at any time by pressing
Control-C, but this can leave your system in an inconsistent state.

__EOT
elif [[ -z $RESPFILE ]]; then
	if ! get_responsefile; then
		echo "No response file found; non-interactive mode aborted."
		exit 1
	fi
	rm -f /ai.done
	echo "Performing non-interactive $action..."
	/$action -af /ai.$action.conf 2>&1 </dev/null | sed 's/^.*
//;w/ai.log'
	if [[ -f /ai.done ]]; then
		# Generate unique filename and let rc.firsttime feed it to
		# whatever mail system we have at hand by then.
		while _lf=/mnt/var/log/ai.log.$RANDOM && test -e $_lf; do done
		cp /ai.log $_lf
		chmod 600 $_lf
		_lf=${_lf#/mnt}
		cat <<__EOT >>/mnt/etc/rc.firsttime
( /usr/bin/mail -s '$(hostname) $action log' root < $_lf &&
	rm $_lf ) >/dev/null 2>&1 &
__EOT
		exec reboot
	else
		echo "failed; check /ai.log"
		exit 1
	fi
else
	cp $RESPFILE /ai.conf || exit
fi

# Configure the terminal and keyboard.
set_term

if [[ $MODE == install ]]; then
	ask_until "System hostname? (short form, e.g. 'foo')" "$(hostname -s)"
	[[ ${resp%%.*} != $(hostname -s) ]] && hostname $resp
	THESETS="$THESETS site$VERSION-$(hostname -s).tgz"

	echo
	donetconfig

	((NIFS != 0)) && startcgiinfo

	echo
	while :; do
		askpassword "Password for root account?"
		_rootpass="$_password"
		[[ -n "$_password" ]] && break
		echo "The root password must be set."
	done

	rootkey=
	$AUTO && ask "Public ssh key for root account?" none &&
		[[ $resp != none ]] && rootkey=$resp

	questions
	user_setup

	set_timezone /var/tzlist
	echo
fi

# Show device name, label and size for the provided list of devices
diskinfo() {
	local _d
	for _d; do
		makedev $_d
		echo -n "$_d: "
		disklabel -dpg $_d 2>/dev/null |
		sed	-e '/^label: /{s,,,;s/ *$//;s/^$/<no label>/;H;d;}' \
			-e '/.*# total bytes: \(.*\)/{s//(\1)/;H;}' \
			-e '$!d;x;s/\n/ /'
		rm -f /dev/{r,}$_d?
	done
}

# Get ROOTDISK, ROOTDEV and SWAPDEV.
while :; do
	echo "Available disks are: $(get_dkdevs | sed 's/^$/none/')."
	_ask "Which disk is the root disk? ('?' for details)" \
		$(get_dkdevs | sed 's/ .*//') || continue
	case $resp in
	"?")	diskinfo $(get_dkdevs);;
	'')	;;
	*)	isin "$resp" $(get_dkdevs) && break
		echo "no such disk";;
	esac
done
makedev $resp || exit

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