path: root/distrib/miniroot/install.sub

#!/bin/sh
#	$OpenBSD: install.sub,v 1.5 1997/04/30 18:52:45 niklas Exp $
#	$NetBSD: install.sub,v 1.5.2.8 1996/09/02 23:25:02 pk 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.

ROOTDISK=""				# filled in below
VERSION=				# filled in automatically (see list)
export VERSION

ALLSETS="base comp etc games man misc text"	# default install sets
UPGRSETS="base comp games man misc text"	# default upgrade sets
THESETS=					# one of the above

local_sets_dir=""			# Path searched for sets by install_sets
					# on the local filesystems

# decide upon an editor
if [ X$EDITOR = X ]; then
	if [ -x /usr/bin/vi ]; then
		EDITOR=vi
	else
		EDITOR=ed
	fi
fi

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
	local	_a

	_a=$1; shift
	while [ $# != 0 ]; do
		if [ "$_a" != "$1" ]; then
			echo "$1";
		fi
		shift
	done
}

cutword () {
# read a line of data, return Nth element.
	local _a
	local _n
	local _oifs

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

	_n=$1
	read _a; set -- $_a
	IFS="$_oifs"
	if [ "$1" = "" ]; then return; fi
	eval echo \$$_n
}

cutlast () {
# read a line of data, return last element. Equiv. of awk '{print $NF}'.
	local _a
	local _oifs

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

	read _a; set -- $_a
	IFS="$_oifs"
	if [ "$1" = "" ]; then return; fi
	while [ "$#" -gt 10 ]; do shift 10; done
	eval echo \$$#
}

firstchar () {
# return first character of argument
	local _a
	_a=$1
	while [ ${#_a} != 1 ]; do
		_a=${_a%?}
	done
	echo $_a
}

basename () {
	local _oifs
	if [ "$1" = "" ]; then return; fi
	_oifs="$IFS"
	IFS="/"
	set -- $1
	IFS="$_oifs"
	while [ "$#" -gt 10 ]; do shift 10; done
	eval echo \$$#
}

dir_has_sets() {
	# return true when the directory $1 contains a set for $2...$n
	local _dir
	local _file

	_dir=$1; shift
	for _file in $*
	do
		if [ -f $_dir/${_file}.tar.gz ]; then
			return 0
		fi
		# Try for stupid msdos convention
		if [ -f $_dir/${_file}.tgz ]; then
			return 0
		fi
	done
	return 1
}

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 $!
}

get_localdir() {
	# $1 is relative mountpoint
	local _mp
	local _dir

	_mp=$1
	_dir=
	while : ; do
	    echo -n "Enter the pathname where the sets are stored [$_dir] "
	    getresp "$_dir"
	    _dir=$resp

	    # Allow break-out with empty response
	    if [ -z "$_dir" ]; then
		echo -n "Are you sure you don't want to set the pathname? [n] "
		getresp "n"
		case "$resp" in
			y*|Y*)
				break
				;;
			*)
				continue
				;;
		esac
	    fi

	    if dir_has_sets "$_mp/$_dir" $THESETS
	    then
		local_sets_dir="$_mp/$_dir"
		break
	    else
		cat << __get_reldir_1
The directory \"$local_sets_dir\" does not exist, or does not hold any of the
upgrade sets.
__get_reldir_1
		echo -n "Re-enter pathname? [y] "
		getresp "y"
		case "$resp" in
			y*|Y*)
				;;
			*)
				local_sets_dir=""
				break
				;;
		esac
	    fi
	done
}

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 isin $resp $_DKDEVS ; 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

	sed "/^$1 /d" < /tmp/hosts > /tmp/hosts.new
	mv /tmp/hosts.new /tmp/hosts

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

addifconfig() {
	# $1 - interface name
	# $2 - interface symbolic name
	# $3 - interface IP address
	# $4 - interface netmask
	# $5 - (optional) interface link-layer directives

	# Create a hostname.* file for the interface.
	echo "inet $2 $4 NONE $5" > /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() {

	local _up
	local _interface_name
	local _interface_ip
	local _interface_mask
	local _interface_symname
	local _interface_extra

	_interface_name=$1

	set -- `ifconfig $_interface_name | sed -n '
		1s/.*<UP,.*$/UP/p
		1s/.*<.*>*$/DOWN/p
		2s/inet//
		2s/--> [0-9.][0-9.]*//
		2s/netmask//
		2s/broadcast//
		2p'`

	_up=$1
	_interface_ip=$2
	_interface_mask=$3

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

	echo "Your network interface might require additional link-layer"
	echo "directives (like \`link0'). If this is the case you can enter"
	echo "these at the next prompt."
	echo ""
	echo -n "Additional link-layer arguments? [$_interface_extra] "
	getresp "$_interface_extra"
	if [ "X${resp}" != X"" ]; then
		_interface_extra=$resp
	fi

	# Configure the interface.  If it
	# succeeds, add it to the permanent
	# network configuration info.
	if [ $_up != "UP" ]; then
		ifconfig ${_interface_name} down
		if ifconfig ${_interface_name} inet \
		    ${_interface_ip} \
		    netmask ${_interface_mask} ${_interface_extra} up ; then
			addifconfig \
			    ${_interface_name} \
			    ${_interface_symname} \
			    ${_interface_ip} \
			    ${_interface_mask} ${_interface_extra}
			return 0
		fi
	else
		echo "Interface ${_interface_name} is already active."
		echo "Just saving configuration on new root filesystem."
		addifconfig \
		    ${_interface_name} \
		    ${_interface_symname} \
		    ${_interface_ip} \
		    ${_interface_mask} ${_interface_extra}
	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} | cutword 1'`
		echo "get ${_ftp_file} |\"tar --unlink -zxvpf -\"" >> \
		    /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_from_mounted_fs() {
	# $1 - directory containing installation sets
	local _filename
	local _sets
	local _next
	local _f

	_sets=""
	if dir_has_sets $1 $THESETS; then
		for _f in $THESETS ; do
			if [ -f $1/${_f}.tar.gz ]; then
				_sets="$_sets ${_f}.tar.gz"
			elif [ -f $1/${_f}.tgz ]; then
				_sets="$_sets ${_f}.tgz"
			fi
		done
	else
		echo "There are no OpenBSD install sets available in \"$1\""
		return
	fi

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

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

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

		echo -n "File name [$_next]? "
		getresp "$_next"
		_f=$resp
		_filename="/$1/$_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 $_filename | (cd /mnt; tar --unlink -zxvpf -)
		echo "Extraction complete."
		_setsdone="$_f $_setsdone"

	done
}

install_cdrom() {
	local _drive
	local _partition_range
	local _partition
	local _fstype
	local _directory

	# 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 partition with the installation sets:

__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 $_CDDEVS ; then
				_drive=$resp
			else
				echo ""
				echo "The CD-ROM $resp does not exist."
				echo "Aborting."
				return
			fi
			;;
	esac

	# Get partition
	_partition_range=`md_get_partition_range`
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Partition? [c] "
		getresp "c"
		case "$resp" in
			$_partition_range)
				_partition=$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)
				_fstype=$resp
				;;

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

	# Mount the CD-ROM
	if ! mount -t ${_filesystem} -o ro \
	    /dev/${_drive}${_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${resp}" = X"" ]; do
		echo "Enter the directory relative to the mount point that"
		echo -n "contains the file. [${_directory}] "
		getresp "${_directory}"
	done
	_directory=$resp

	install_from_mounted_fs /mnt2/${_directory}
	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 failure.

	local _drive
	local _partition_range
	local _partition
	local _fstype
	local _fsopts
	local _directory
	local _md_fstype
	local _md_fsopts

	getresp "abort"
	case "$resp" in
		abort)
			echo "Aborting."
			return 0
			;;

		*)
			if isin $resp $_DKDEVS ; then
				_drive=$resp
			else
				echo ""
				echo "The disk $resp does not exist."
				echo "Aborting."
				return 0
			fi
			;;
	esac

	# Get partition
	_partition_range=`md_get_partition_range`
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Partition? [d] "
		getresp "d"
		case "$resp" in
			$_partition_range)
				_partition=$resp
				;;

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

	# Ask for filesystem type
	cat << \__mount_a_disk_2

The following filesystem types are supported:
	1) ffs
__mount_a_disk_2
	_md_fstype=`md_native_fstype`
	_md_fsopts=`md_native_fsopts`
	if [ ! -z "$_md_fstype" ]; then
		echo "	2) $_md_fstype"
	else
		_md_fstype="_undefined_"
	fi
	resp=""		# force one iteration
	while [ "X${resp}" = X"" ]; do
		echo -n "Which filesystem type? [ffs] "
		getresp "ffs"
		case "$resp" in
			ffs)
				_fstype=$resp
				_fsopts="ro"
				;;
			$_md_fstype)
				_fstype=$resp
				_fsopts=$_md_fsopts
				;;
			*)
				echo "Invalid response: $resp"
				resp=""		# force loop to repeat
				;;
		esac
	done

	# Mount the disk
	if ! mount -t ${_fstype} -o $_fsopts \
	    /dev/${_drive}${_partition} /mnt2 ; then
		echo "Cannot mount disk.  Aborting."
		return 0
	fi
	return 1
}

install_disk() {
	local _directory

	cat << \__install_disk_1

The following disk devices are installed on your system; please select
the disk device containing the partition with the installation sets:

__install_disk_1
	_DKDEVS=`md_get_diskdevs`
	echo    "$_DKDEVS"
	echo	""
	echo -n	"Which is the disk with the installation sets? [abort] "

	if mount_a_disk ; then
		return
	fi

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

	install_from_mounted_fs /mnt2/${_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_from_mounted_fs /mnt2/${_nfs_directory}
	umount -f /mnt2 > /dev/null 2>&1
}

install_tape() {
	local _xcmd

	# 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)
			_xcmd="tar --unlink -zxvpf -"
			;;

		2)
			_xcmd="tar --unlink -xvpf -"
			;;

		*)
			echo "Invalid response: $resp."
			resp=""		# force loop to repeat
			;;
		esac
		( cd /mnt; dd if=$TAPE | $_xcmd )
	done
	echo "Extraction complete."
}

get_timezone() {
	local _a
	local _zonepath

	#
	# If the zoneinfo is not on the installation medium or on the
	# installed filesystem, set TZ to GMT and return immediatly.
	#
	if [ ! -e /usr/share/zoneinfo -a ! -e /mnt/usr/share/zoneinfo ]; then
		TZ=GMT
		return
	fi
	if [ ! -d /usr/share/zoneinfo ]; then
		_zonepath=/mnt
	else
		_zonepath=""
	fi
		
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$TZ = X ]; then
		TZ=`ls -l /mnt/etc/localtime 2>/dev/null | cutlast`
		TZ=${TZ#/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 ${_zonepath}/usr/share/zoneinfo
			;;
		*)
			_a=$resp
			while [ -d ${_zonepath}/usr/share/zoneinfo/$_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 ${_zonepath}/usr/share/zoneinfo/$_a ;;
				*)	_a=${_a}/${resp}
					if [ -f ${_zonepath}/usr/share/zoneinfo/$_a ]; then
						break;
					fi
					;;
				esac
			done
			if [ -f ${_zonepath}/usr/share/zoneinfo/$_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()
{
	local _yup
	_yup="FALSE"

	# 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 [ "X$local_sets_dir" != "X" ]; then
		install_from_mounted_fs ${local_sets_dir}
		if [ X"$_setsdone" != X ]; then
			_yup="TRUE"
		fi
	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, (N)FS"
			echo -n " or local (d)isk? "
			getresp ""
			case "$resp" in
			d*|D*)
				install_disk
				;;
			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
	local _dev
	local _mp
	local _fstype
	local _rest

	# 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=$2
	( while read _dev _mp _fstype _rest; do
		# Skip comment lines
		case "$_dev" in
			\#*)	continue;;
			*)	;;
		esac
		# and some filesystem types (like there are swap,kernfs,...)
		case "$_fstype" in
			ffs|ufs|nfs)	;;
			*)	continue;;
		esac
		if [ "$_mp" = "/" ]; then
			echo $_dev /mnt $_fstype $_rest
		else
			echo $_dev /mnt$_mp $_fstype $_rest
		fi
	    done ) < $_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
		set -- $line
		_dev=$1
		_mp=$2
		_fstype=$3
		_opt=$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.
	# Usage: [-fast] <fstab file>
	local _fast
	local _fstab
	local _pid

	if [ "$1" = "-fast" ]; then
		_fast=1
		_fstab=$2
	else
		_fast=0
		_fstab=$1
	fi

	if [ ! \( -f $_fstab -a -s $_fstab \) ]; then
		echo "fstab empty" > /dev/tty
		return
	fi

	if [ $_fast = 0 ]; then
		echo -n	"Syncing disks..."
		_pid=`twiddle`
		sync; sleep 4; sync; sleep 2; sync; sleep 2
		kill $_pid
		echo	"done."
	fi

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

		if [ $_fast = 0 ]; then
			exit
		fi
		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
			set -- $line
			_devs="$1 ${_devs}"
			_mps="$2 ${_mps}"
		done

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