#!/bin/sh
#	$OpenBSD: install.sub,v 1.3 1996/06/29 05:54:16 tholo Exp $
#	$NetBSD: install.sub,v 1.2 1996/02/28 00:47:43 thorpej Exp $
#
# 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 installation/upgrade script - common subroutines.

VERSION=1.1A
export VERSION				# XXX needed in subshell
ROOTDISK=""				# filled in below

ALLSETS="base comp etc games man misc text"	# default install sets
UPGRSETS="base comp games man misc text"	# default upgrade sets

getresp() {
	read resp
	if [ "X$resp" = "X" ]; then
		resp=$1
	fi
}

isin() {
# test the first argument against the remaining ones, return succes on a match
	_a=$1; shift
	while [ $# != 0 ]; do
		if [ "$_a" = "$1" ]; then return 0; fi
		shift
	done
	return 1
}

rmel() {
# remove first argument from list formed by the remaining arguments
	_a=$1; shift
	while [ $# != 0 ]; do
		if [ "$_a" != "$1" ]; then
			echo "$1";
		fi
		shift
	done
}

twiddle() {
# spin the propeller so we don't get bored
	while : ; do  
		sleep 1; echo -n "/";
		sleep 1; echo -n "-";
		sleep 1; echo -n "\\";
		sleep 1; echo -n "|";
	done > /dev/tty & echo $!
}

. install.md

do_mfs_mount() {
	# $1 is the mount point
	# $2 is the size in DEV_BIZE blocks

	umount $1 > /dev/null 2>&1
	if ! mount_mfs -s $2 swap $1 ; then
		cat << \__mfs_failed_1

FATAL ERROR: Can't mount the memory filesystem.

__mfs_failed_1
		exit
	fi

	# Bleh.  Give mount_mfs a chance to DTRT.
	sleep 2
}

getrootdisk() {
	cat << \__getrootdisk_1

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 standalone installation
program.

Available disks are:

__getrootdisk_1
	_DKDEVS=`md_get_diskdevs`
	echo	"$_DKDEVS"
	echo	""
	echo -n	"Which disk is the root disk? "
	getresp ""
	if isin $resp $_DKDEVS ; then
		ROOTDISK="$resp"
	else
		echo ""
		echo "The disk $resp does not exist."
		ROOTDISK=""
	fi
}

labelmoredisks() {
	cat << \__labelmoredisks_1

You may label the following disks:

__labelmoredisks_1
	echo "$_DKDEVS"
	echo	""
	echo -n	"Label which disk? [done] "
	getresp "done"
	case "$resp" in
		done)
			;;

		*)
			if echo "$_DKDEVS" | grep "^$resp" > /dev/null ; then
				md_labeldisk $resp
			else
				echo ""
				echo "The disk $resp does not exist."
			fi
			;;
	esac
}

addhostent() {
	# $1 - IP address
	# $2 - symbolic name

	# Create an entry in the hosts table.  If no host table
	# exists, create one.  If the IP address already exists,
	# replace it's entry.
	if [ ! -f /tmp/hosts ]; then
		echo "127.0.0.1 localhost" > /tmp/hosts
	fi

	if grep "^$1 " /tmp/hosts > /dev/null; then
		grep -v "^$1 " /tmp/hosts > /tmp/hosts.new
		mv /tmp/hosts.new /tmp/hosts
	fi

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

addifconfig() {
	# $1 - interface name
	# $2 - interface symbolic name
	# $3 - interface IP address
	# $4 - interface netmask

	# Create a hostname.* file for the interface.
	echo "inet $2 $4" > /tmp/hostname.$1

	addhostent $3 $2
}

configurenetwork() {
	local _ifsdone
	local _ifs

	_IFS=`md_get_ifdevs`
	_ifsdone=""
	resp=""		# force at least one iteration
	while [ "X${resp}" != X"done" ]; do
	cat << \__configurenetwork_1

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

__configurenetwork_1

		for _ifs in $_IFS; do
			if isin $_ifs $_ifsdone ; then
				echo -n "[X] "
			else
				echo -n "    "
			fi
			echo $_ifs
		done
		echo	""
		echo -n	"Configure which interface? [done] "
		getresp "done"
		case "$resp" in
		"done")
			;;
		*)
			_ifs=$resp
			if isin $_ifs $_IFS ; then
				if configure_ifs $_ifs ; then
					_ifsdone="$_ifs $_ifsdone"
				fi
			else
				echo "Invalid response: \"$resp\" is not in list"
			fi
			;;
		esac
	done
}

configure_ifs() {

	_interface_name=$1

	# Get IP address
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "IP address? "
		getresp ""
		_interface_ip=$resp
	done

	# Get symbolic name
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Symbolic (host) name? "
		getresp ""
		_interface_symname=$resp
	done

	# Get netmask
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Netmask? "
		getresp ""
		_interface_mask=$resp
	done

	# Configure the interface.  If it
	# succeeds, add it to the permanent
	# network configuration info.
	ifconfig ${_interface_name} down
	if ifconfig ${_interface_name} inet \
	    ${_interface_ip} \
	    netmask ${_interface_mask} up ; then
		addifconfig \
		    ${_interface_name} \
		    ${_interface_symname} \
		    ${_interface_ip} \
		    ${_interface_mask}
		return 0
	fi
	return 1
}

# Much of this is gratuitously stolen from /etc/netstart.
enable_network() {

	# Set up the hostname.
	if [ ! -f /mnt/etc/myname ]; then
		echo "ERROR: no /etc/myname!"
		return 1
	fi
	hostname=`cat /mnt/etc/myname`
	hostname $hostname

	# configure all the interfaces which we know about.
(
	tmp="$IFS"
	IFS="$IFS."
	set -- `echo /mnt/etc/hostname*`
	IFS=$tmp
	unset tmp

	while [ $# -ge 2 ] ; do
		shift		# get rid of "hostname"
		(
			read af name mask bcaddr extras
			read dt dtaddr

			if [ ! -n "$name" ]; then
		    echo "/etc/hostname.$1: invalid network configuration file"
				exit
			fi

			cmd="ifconfig $1 $af $name "
			if [ "${dt}" = "dest" ]; then cmd="$cmd $dtaddr"; fi
			if [ -n "$mask" ]; then cmd="$cmd netmask $mask"; fi
			if [ -n "$bcaddr" -a "X$bcaddr" != "XNONE" ]; then
				cmd="$cmd broadcast $bcaddr";
			fi
			cmd="$cmd $extras"

			$cmd
		) < /mnt/etc/hostname.$1
		shift
	done
)

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

	# use loopback, not the wire
	route add $hostname localhost

	# /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 add default `cat /mnt/etc/mygate`
	fi

	# enable the resolver, if appropriate.
	if [ -f /mnt/etc/resolv.conf ]; then
		_resolver_enabled="TRUE"
		cp /mnt/etc/resolv.conf /tmp/resolv.conf.shadow
	fi

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

	echo	""

	if [ "X${_resolver_enabled}" = X"TRUE" ]; then
		netstat -r
		echo	""
		echo	"Resolver enabled."
	else
		netstat -rn
		echo	""
		echo	"Resolver not enabled."
	fi

	return 0
}

install_ftp() {
	# Get several parameters from the user, and create
	# a shell script that directs the appropriate
	# commands into ftp.
	cat << \__install_ftp_1

This is an automated ftp-based installation process.  You will be asked
several questions.  The correct set of commands will be placed in a script
that will be fed to ftp(1).

__install_ftp_1
	# Get server IP address
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Server IP? [${_ftp_server_ip}] "
		getresp "${_ftp_server_ip}"
		_ftp_server_ip=$resp
	done

	# Get server directory
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Server directory? [${_ftp_server_dir}] "
		getresp "${_ftp_server_dir}"
		_ftp_server_dir=$resp
	done

	# Get login name
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Login? [${_ftp_server_login}] "
		getresp "${_ftp_server_login}"
		_ftp_server_login=$resp 
	done

	# Get password
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Password? [${_ftp_server_password}] "
		getresp "${_ftp_server_password}"
		_ftp_server_password=$resp
	done

	# Get list of files for mget.
	cat << \__install_ftp_2

You will now be asked for files to extract.  Enter one file at a time.
When you are done entering files, enter 'done'.

__install_ftp_2
	echo "#!/bin/sh" > /tmp/ftp-script.sh
	echo "cd /mnt" >> /tmp/ftp-script.sh
	echo "ftp -i -n $_ftp_server_ip << \__end_commands" >> \
	    /tmp/ftp-script.sh
	echo "user $_ftp_server_login $_ftp_server_password" >> \
	    /tmp/ftp-script.sh
	echo "bin" >> /tmp/ftp-script.sh
	echo "cd $_ftp_server_dir" >> /tmp/ftp-script.sh

	resp=""		# force one interation
	while [ "X${resp}" != X"done" ]; do
		echo -n "File? [done] "
		getresp "done"
		if [ "X${resp}" = X"done" ]; then
			break
		fi

		_ftp_file=`echo ${resp} | awk '{print $1}'`
		echo "get ${_ftp_file} |\"tar -xzvpf -\"" >> \
		    /tmp/ftp-script.sh
	done

	echo "quit" >> /tmp/ftp-script.sh
	echo "__end_commands" >> /tmp/ftp-script.sh

	sh /tmp/ftp-script.sh
	rm -f /tmp/ftp-script.sh
	echo "Extraction complete."
}

install_common_nfs_cdrom() {
	# $1 - directory containing file
	local _filename
	local _setsdone
	local _prev
	local _f

	_sets=`(cd /mnt2/$1; ls *.tar.gz)`
	if [ -z "$_sets" ]; then
		echo "There are no OpenBSD install sets available in \"$1\""
		return
	fi

	_setsdone=""
	while : ; do
		echo "The following sets are available for extraction:"
		echo "(marked sets have already been extracted)"
		echo ""

		_prev=""
		for _f in $_sets ; do
			if isin $_f $_setsdone; then
				echo -n "[X] "
			else
				echo -n "    "
				if [ -z "$_prev" ]; then _prev=$_f; fi
			fi
			echo $_f
		done
		echo ""

		# Get the name of the file.
		if [ "X$_prev" = "X" ]; then resp=n; else resp=y; fi
		echo -n "Continue extraction [$resp]?"
		getresp "$resp"
		if [ "$resp" = "n" ]; then
			break
		fi

		echo -n "File name [$_prev]? "
		getresp "$_prev"
		_f=$resp
		_filename="/mnt2/$1/$_f"

		# Ensure file exists
		if [ ! -f $_filename ]; then
			echo "File $_filename does not exist.  Check to make"
			echo "sure you entered the information properly."
			continue
		fi

		# Extract file
		cat $_filename | (cd /mnt; tar -xzvpf -)
		echo "Extraction complete."
		_setsdone="$_f $_setsdone"

	done
}

install_cdrom() {
	# Get the cdrom device info
	cat << \__install_cdrom_1

The following CD-ROM devices are installed on your system; please select
the CD-ROM device containing the installation media:

__install_cdrom_1
	_CDDEVS=`md_get_cddevs`
	echo    "$_CDDEVS"
	echo	""
	echo -n	"Which is the CD-ROM with the installation media? [abort] "
	getresp "abort"
	case "$resp" in
		abort)
			echo "Aborting."
			return
			;;

		*)
			if isin $resp $_CDDEVS ; then
				_cdrom_drive=$resp
			else
				echo ""
				echo "The CD-ROM $resp does not exist."
				echo "Aborting."
				return
			fi
			;;
	esac

	# Get partition
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Partition? [c] "
		getresp "c"
		case "$resp" in
			[a-h])
				_cdrom_partition=$resp
				;;

			*)
				echo "Invalid response: $resp"
				resp=""		# force loop to repeat
				;;
		esac
	done

	# Ask for filesystem type
	cat << \__install_cdrom_2

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

__install_cdrom_2
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Which filesystem type? [cd9660] "
		getresp "cd9660"
		case "$resp" in
			cd9660|ffs)
				_cdrom_filesystem=$resp
				;;

			*)
				echo "Invalid response: $resp"
				resp=""		# force loop to repeat
				;;
		esac
	done

	# Mount the CD-ROM
	if ! mount -t ${_cdrom_filesystem} -o ro \
	    /dev/${_cdrom_drive}${_cdrom_partition} /mnt2 ; then
		echo "Cannot mount CD-ROM drive.  Aborting."
		return
	fi

	# Get the directory where the file lives
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo "Enter the directory relative to the mount point that"
		echo -n "contains the file. [${_cdrom_directory}] "
		getresp "${_cdrom_directory}"
	done
	_cdrom_directory=$resp

	install_common_nfs_cdrom ${_cdrom_directory}
	umount -f /mnt2 > /dev/null 2>&1
}

install_nfs() {
	# Get the IP address of the server
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Server IP address? [${_nfs_server_ip}] "
		getresp "${_nfs_server_ip}"
	done
	_nfs_server_ip=$resp

	# Get server path to mount
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Filesystem on server to mount? [${_nfs_server_path}] "
		getresp "${_nfs_server_path}"
	done
	_nfs_server_path=$resp

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

		*)
			_nfs_tcp=""
			;;
	esac

	# Mount the server
	mkdir /mnt2 > /dev/null 2>&1
	if ! mount_nfs $_nfs_tcp ${_nfs_server_ip}:${_nfs_server_path} \
	    /mnt2 ; then
		echo "Cannot mount NFS server.  Aborting."
		return
	fi

	# Get the directory where the file lives
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo "Enter the directory relative to the mount point that"
		echo -n "contains the file. [${_nfs_directory}] "
		getresp "${_nfs_directory}"
	done
	_nfs_directory=$resp

	install_common_nfs_cdrom ${_nfs_directory}
	umount -f /mnt2 > /dev/null 2>&1
}

install_tape() {
	# Get the name of the tape from the user.
	cat << \__install_tape_1

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

__install_tape_1
	_tape=`basename $TAPE`
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Name of tape device? [${_tape}]"
		getresp "${_tape}"
	done
	_tape=`basename $resp`
	TAPE="/dev/${_tape}"
	if [ ! -c $TAPE ]; then
		echo "$TAPE does not exist or is not a character special file."
		echo "Aborting."
		return
	fi
	export TAPE

	# Rewind the tape device
	echo -n "Rewinding tape..."
	if ! mt rewind ; then
		echo "$TAPE may not be attached to the system or may not be"
		echo "a tape device.  Aborting."
		return
	fi
	echo "done."

	# Get the file number
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "File number? "
		getresp ""
		case "$resp" in
			[1-9]*)
				_nskip=`expr $resp - 1`
				;;

			*)
				echo "Invalid file number ${resp}."
				resp=""		# fore loop to repeat
				;;
		esac
	done

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

	cat << \__install_tape_2

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

__install_tape_2
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Which way is it? [1] "
		getresp "1"
		case "$resp" in
			1)
				(
					cd /mnt
					dd if=$TAPE | tar -xzvpf -
				)
				;;

			2)
				(
					cd /mnt
					dd if=$TAPE | tar -xzvpf -
				)
				;;

			*)
				echo "Invalid response: $resp."
				resp=""		# force loop to repeat
				;;
		esac
	done
	echo "Extraction complete."
}

get_timezone() {
	local _a
cat << \__get_timezone_1

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 "MET" or "GMT-6".
Other zones are grouped by continent, with detailed zone information
separated by a slash ("/"), e.g. "US/Pacific".

To get a listing of what's available in /usr/share/zoneinfo, enter "?"
at the prompts below.

__get_timezone_1
	if [ X$TZ = X ]; then
		TZ=`ls -l /etc/timezone 2>/dev/null | awk '{print $NF}' |
			sed -e 's?/usr/share/zoneinfo/??'`
	fi
	while :; do
		echo -n	"What timezone are you in [\`?' for list] [$TZ]? "
		getresp "$TZ"
		case "$resp" in
		"")
			echo "Timezone defaults to GMT"
			TZ="GMT"
			break;
			;;
		"?")
			ls /usr/share/zoneinfo
			;;
		*)
			_a=$resp
			while [ -d /usr/share/zoneinfo/$_a ]; do
				echo -n "There are several timezones available"
				echo " within zone '$_a'"
				echo -n "Select a sub-timezone [\`?' for list]: "
				getresp ""
				case "$resp" in
				"?") ls /usr/share/zoneinfo/$_a ;;
				*)	_a=${_a}/${resp}
					if [ -f /usr/share/zoneinfo/$_a ]; then
						break;
					fi
					;;
				esac
			done
			if [ -f /usr/share/zoneinfo/$_a ]; then
				TZ="$_a"
				echo "You have selected timezone \"$_a\"".
				break 2
			fi
			echo "'/usr/share/zoneinfo/$_a' is not a valid timezone on this system."
			;;
		esac
	done
}

install_sets()
{
# arguments: the base names of the distribution sets to consider
# Ask the user which media to load the distribution from.
cat << \__install_sets_1

It is now time to extract the installation sets onto the hard disk.
Make sure The sets are either on a local device (i.e. tape, CD-ROM) or on a
network server.

__install_sets_1
if [ -f $RELDIR/$1.tar.gz ]; then
	echo -n "Install from sets in the current root filesystem? [y] "
	getresp "y"
	case "$resp" in
	y*|Y*)
		for _f do
			if [ ! -f $RELDIR/${_f}.tar.gz ]; then
				continue
			fi
			echo -n "Install \"$_f\" ? [y]"
			getresp "y"
			case "$resp" in
			y*|Y*)
			     cat $RELDIR/${_f}.tar.gz |
					(cd /mnt; tar -xzvpf -)
				_yup="TRUE"
				echo "Extraction complete."
				;;
			*)
				echo "Skipping \"$_f\"."
				;;
			esac
		done
		;;
	*)
		_yup="FALSE"
		;;
	esac
else
	_yup="FALSE"
fi

# Go on prodding for alternate locations
resp=""		# force at least one iteration
while [ "X${resp}" = X"" ]; do
	# If _yup is not FALSE, it means that we extracted sets above.
	# If that's the case, bypass the menu the first time.
	if [ X"$_yup" = X"FALSE" ]; then
		echo -n	"Install from (f)tp, (t)ape, (C)D-ROM, or (N)FS? [f] "
		getresp "f"
		case "$resp" in
		f*|F*)
			install_ftp
			;;

		t*|T*)
			install_tape
			;;

		c*|C*)
			install_cdrom
			;;

		n*|N*)
			install_nfs
			;;

		*)
			echo "Invalid response: $resp"
			resp=""
			;;
		esac
	else
		_yup="FALSE"	# So we'll ask next time
	fi

	# Give the user the opportunity to extract more sets.  They don't
	# necessarily have to come from the same media.
	echo	""
	echo -n	"Extract more sets? [n] "
	getresp "n"
	case "$resp" in
	y*|Y*)
		# Force loop to repeat
		resp=""
		;;

	*)
		;;
	esac
done
}

munge_fstab()
{
	local _fstab
	local _fstab_shadow
	# Now that the 'real' fstab is configured, we munge it into a 'shadow'
	# fstab which we'll use for mounting and unmounting all of the target
	# filesystems relative to /mnt.  Mount all filesystems.
	_fstab=$1
	_fstab_shadow=$2
	awk '{
		if ($2 == "/")
		    printf("%s /mnt %s %s %s %s\n", $1, $3, $4, $5, $6)
		else
		    printf("%s /mnt%s %s %s %s %s\n", $1, $2, $3, $4, $5, $6)
	}' < $_fstab > $_fstab_shadow
}

mount_fs()
{
	# Must mount filesystems manually, one at a time, so we can make
	# sure the mount points exist.
	# $1 is a file in fstab format
	local _fstab

	_fstab=$1

	( while read line; do
		_dev=`echo $line | awk '{print $1}'`
		_mp=`echo $line | awk '{print $2}'`
		_fstype=`echo $line | awk '{print $3}'`
		_opt=`echo $line | awk '{print $4}'`

		# If not the root filesystem, make sure the mount
		# point is present.
		if [ "X{$_mp}" != X"/mnt" ]; then
			mkdir -p $_mp
		fi

		# Mount the filesystem.  If the mount fails, exit
		# with an error condition to tell the outer
		# later to bail.
		if ! mount -v -t $_fstype -o $_opt $_dev $_mp ; then
			# error message displated by mount
			exit 1
		fi
	done ) < $_fstab

	if [ "X${?}" != X"0" ]; then
		cat << \__mount_filesystems_1

FATAL ERROR:  Cannot mount filesystems.  Double-check your configuration
and restart the installation process.
__mount_filesystems_1
		exit
	fi
}

unmount_fs()
{
	# Unmount all filesystems and check their integrity.
	# $1 is a file in fstab format
	local _fstab

	_fstab=$1

	echo -n	"Syncing disks..."
	pid=`twiddle`
	sync; sleep 4; sync; sleep 2; sync; sleep 2
	kill $pid
	echo	"done."

	(
		_devs=""
		_mps=""
		# maintain reverse order
		while read line; do
			_devs="`echo $line | awk '{print $1}'` ${_devs}"
			_mps="`echo $line | awk '{print $2}'` ${_mps}"
		done
		echo -n "Umounting filesystems... "
		for _mp in ${_mps}; do
			echo -n "${_mp} "
			umount ${_mp}
		done
		echo "Done."

		echo "Checking filesystem integrity..."
		for _dev in ${_devs}; do
			echo  "${_dev}"
			fsck -f ${_dev}
		done
		echo "Done."
	) < $_fstab
}

check_fs()
{
	# Check filesystem integrity.
	# $1 is a file in fstab format
	local _fstab

	_fstab=$1

	(
		_devs=""
		_mps=""
		while read line; do
			_devs="`echo $line | awk '{print $1}'` ${_devs}"
			_mps="`echo $line | awk '{print $2}'` ${_mps}"
		done

		echo "Checking filesystem integrity..."
		for _dev in ${_devs}; do
			echo  "${_dev}"
			fsck -f ${_dev}
		done
		echo "Done."
	) < $_fstab
}