xref: /freebsd/usr.sbin/bsdinstall/scripts/zfsboot (revision cd88b8869f9b2c280b1de02608f52fdf497b4cb1)

#!/bin/sh
#-
# Copyright (c) 2013 Allan Jude
# Copyright (c) 2013 Devin Teske
# 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 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 AUTHOR 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.
#
# $FreeBSD$
#
############################################################ INCLUDES

BSDCFG_SHARE="/usr/share/bsdconfig"
. $BSDCFG_SHARE/common.subr || exit 1
f_dprintf "%s: loading includes..." "$0"
f_include $BSDCFG_SHARE/device.subr
f_include $BSDCFG_SHARE/dialog.subr
f_include $BSDCFG_SHARE/password/password.subr
f_include $BSDCFG_SHARE/variable.subr

############################################################ CONFIGURATION

#
# Default name of the boot-pool
#
: ${ZFSBOOT_POOL_NAME:=zroot}

#
# Default name for the boot environment parent dataset
#
: ${ZFSBOOT_BEROOT_NAME:=bootenv}

#
# Default name for the primany boot environment
#
: ${ZFSBOOT_BOOTFS_NAME:=default}

#
# Default Virtual Device (vdev) type to create
#
: ${ZFSBOOT_VDEV_TYPE:=stripe}

#
# Should we use gnop(8) to configure a transparent mapping to 4K sectors?
#
: ${ZFSBOOT_GNOP_4K_FORCE_ALIGN:=1}

#
# Should we use geli(8) to encrypt the drives?
#
: ${ZFSBOOT_GELI_ENCRYPTION:=}

#
# Default name the unencrypted pool when using geli(8) to encrypt the drives
#
: ${ZFSBOOT_GELI_POOL_NAME:=bootpool}

#
# Default size for the unencrypted boot pool when using geli(8)
#
: ${ZFSBOOT_GELI_BOOT_SIZE:=2g}

#
# Default path to the geli(8) keyfile used in drive encryption
#
: ${ZFSBOOT_GELI_KEY_FILE:=/boot/encryption.key}

#
# Default disks to use (always empty unless being scripted)
#
: ${ZFSBOOT_DISKS:=}

#
# Default partitioning scheme to use on disks
#
: ${ZFSBOOT_PARTITION_SCHEME:=GPT}

#
# How much swap to put on each block device in the boot zpool
# NOTE: Value passed to gpart(8); which supports SI unit suffixes.
#
: ${ZFSBOOT_SWAP_SIZE:=2g}

#
# Default ZFS layout for root zpool
#
# NOTE: Requires /tmp, /var/tmp, /$ZFSBOOT_BOOTFS_NAME/$ZFSBOOT_BOOTFS_NAME
# NOTE: Anything after pound/hash character [#] is ignored as a comment.
#
f_isset ZFSBOOT_DATASETS || ZFSBOOT_DATASETS="
	# DATASET	OPTIONS (comma or space separated; or both)

	# Boot Environment [BE] root and default boot dataset
	/$ZFSBOOT_BEROOT_NAME				mountpoint=none
	/$ZFSBOOT_BEROOT_NAME/$ZFSBOOT_BOOTFS_NAME	mountpoint=/

	# Compress /tmp, allow exec but not setuid
	/tmp		mountpoint=/tmp,compression=lz4,exec=on,setuid=off

	# Don't mount /usr so that 'base' files go to the BEROOT
	/usr		mountpoint=/usr,canmount=off

	/usr/local # local files (i.e. from packages) separate from base system

	# Home directories separated so they are common to all BEs
	/usr/home	setuid=off

	# Ports tree
	/usr/ports		compression=lz4,setuid=off
	/usr/ports/distfiles	compression=off,exec=off,setuid=off
	/usr/ports/packages	compression=off,exec=off,setuid=off

	# Source tree (compressed)
	/usr/src	compression=lz4,exec=off,setuid=off
	/usr/obj	# Object files

	# Create /var and friends
	/var		mountpoint=/var
	/var/crash	compression=lz4,exec=off,setuid=off
	/var/db		exec=off,setuid=off
	/var/db/pkg	compression=lz4,exec=off,setuid=off
	/var/empty	exec=off,setuid=off
	/var/log	compression=lz4,exec=off,setuid=off
	/var/mail	compression=lz4,exec=off,setuid=off
	/var/run	exec=off,setuid=off
	/var/tmp	compression=lz4,exec=on,setuid=off
" # END-QUOTE

############################################################ GLOBALS

#
# Strings that should be moved to an i18n file and loaded with f_include_lang()
#
hline_alnum_arrows_punc_tab_enter="Use alnum, arrows, punctuation, TAB or ENTER"
hline_arrows_space_tab_enter="Use arrows, SPACE, TAB or ENTER"
hline_arrows_tab_enter="Press arrows, TAB or ENTER"
msg_back="Back"
msg_cancel="Cancel"
msg_change="Change Selection"
msg_configure_options="Configure Options:"
msg_create="Install"
msg_create_desc="Proceed with Installation"
msg_create_help="Create ZFS boot pool with displayed options"
msg_detailed_disk_info="gpart(8) show %s:\n%s\n\ncamcontrol(8) inquiry %s:\n%s\n\n\ncamcontrol(8) identify %s:\n%s\n"
msg_disk_info="Disk Info"
msg_disk_info_help="Get detailed information on disk device(s)"
msg_disks_to_use="Disks To Use"
msg_disks_to_use_help="Choose which disks to use for the Virtual Device (Required)"
msg_force_4k_sectors="Force 4K Sectors?"
msg_force_4k_sectors_help="Use gnop(8) to configure forced 4K sector alignment"
msg_freebsd_installer="FreeBSD Installer"
msg_geli_encryption="Encrypt Disks?"
msg_geli_encryption_help="Use geli(8) to encrypt all data partitions"
msg_geli_password="Enter a strong passphrase, used to protect your encryption keys. You will be required to enter this passphrase each time the system is booted"
msg_geli_setup="Initializing encryption on the selected disks, this will take several seconds per disk"
msg_invalid_virtual_device_type="Invalid Virtual Device type \`%s'"
msg_invalid_virtual_device_type_help="Select another Virtual Device type or Cancel to\nreturn to the ZFS menu. From there you can select\nmore disks or rescan for additional devices."
msg_last_chance_are_you_sure="Last Chance! Are you sure you want to destroy the current contents of the following disks:\n%s"
msg_last_chance_are_you_sure_color="\\\\ZrLast Chance!\\\\ZR Are you \\\\Z1sure\\\\Zn you want to \\\\Zr\\\\Z1destroy\\\\Zn the current contents of the following disks:\n%s"
msg_mirror_desc="Mirror - n-Way Mirroring"
msg_mirror_help="[2+ Disks] Mirroring provides the best performance, but the least storage"
msg_no="NO"
msg_no_disks_present_to_configure="No disk(s) present to configure"
msg_no_disks_selected="No disks selected."
msg_not_enough_disks_selected="Not enough disks selected. (%u < %u wanted)"
msg_ok="OK"
msg_partition_scheme="Partition Scheme"
msg_partition_scheme_help="Toggle between GPT and MBR partitioning schemes"
msg_please_enter_a_name_for_your_zpool="Please enter a name for your zpool:"
msg_please_enter_amount_of_swap_space="Please enter amount of swap space (SI-Unit suffixes\nrecommended; e.g., \`2g' for 2 Gigabytes):"
msg_please_select_one_or_more_disks="Please select one or more disks to create a zpool:"
msg_pool_name="Pool Name"
msg_pool_name_cannot_be_empty="Pool name cannot be empty."
msg_pool_name_help="Customize the name of the zpool to be created (Required)"
msg_processing_selection="Processing selection..."
msg_raidz1_desc="RAID-Z1 - Single Redundant RAID"
msg_raidz1_help="[3+ Disks] Withstand failure of 1 disk. Recommended for: 3, 5 or 9 disks"
msg_raidz2_desc="RAID-Z2 - Double Redundant RAID"
msg_raidz2_help="[4+ Disks] Withstand failure of 2 disks. Recommended for: 4, 6 or 10 disks"
msg_raidz3_desc="RAID-Z3 - Triple Redundant RAID"
msg_raidz3_help="[5+ Disks] Withstand failure of 3 disks. Recommended for: 5, 7 or 11 disks"
msg_rescan_devices="Rescan Devices"
msg_rescan_devices_help="Scan for device changes"
msg_select="Select"
msg_select_a_disk_device="Select a disk device"
msg_select_virtual_device_type="Select Virtual Device type:"
msg_stripe_desc="Stripe - No Redundancy"
msg_stripe_help="[1+ Disks] Striping provides maximum storage but no redundancy"
msg_swap_size="Swap Size"
msg_swap_size_help="Customize how much swap space is allocated to each selected disk"
msg_these_disks_are_too_small="These disks are too small given the amount of requested\nswap (%s) and/or GELI (%s) partitions, which would take\n50%% or more (not recommended) of each of the following\nselected disk devices:\n\n  %s\n\nRecommend changing partition size(s) and/or selecting a\ndifferent set of devices."
msg_yes="YES"
msg_zfs_configuration="ZFS Configuration"
msg_zfs_vdev_type="ZFS VDev Type"
msg_zfs_vdev_type_help="Select type of ZFS Virtual Device to create"

############################################################ FUNCTIONS

# dialog_menu_main
#
# Display the dialog(1)-based application main menu.
#
dialog_menu_main()
{
	local title="$DIALOG_TITLE"
	local btitle="$DIALOG_BACKTITLE"
	local prompt="$msg_configure_options"
	local force4k="$msg_no"
	local usegeli="$msg_no"
	[ "$ZFSBOOT_GNOP_4K_FORCE_ALIGN" ] && force4k="$msg_yes"
	[ "$ZFSBOOT_GELI_ENCRYPTION" ] && usegeli="$msg_yes"
	local menu_list="
		'>>> $msg_create'         '$msg_create_desc'
		                          '$msg_create_help'
		'- $msg_rescan_devices'   '*'
		                          '$msg_rescan_devices_help'
		'- $msg_disk_info'        '*'
		                          '$msg_disk_info_help'
		'1 $msg_pool_name'        '$ZFSBOOT_POOL_NAME'
		                          '$msg_pool_name_help'
		'2 $msg_disks_to_use'     '$ZFSBOOT_DISKS'
		                          '$msg_disks_to_use_help'
		'3 $msg_zfs_vdev_type'    '$ZFSBOOT_VDEV_TYPE'
		                          '$msg_zfs_vdev_type_help'
		'4 $msg_force_4k_sectors' '$force4k'
		                          '$msg_force_4k_sectors_help'
		'5 $msg_geli_encryption'  '$usegeli'
		                          '$msg_geli_encryption_help'
		'6 $msg_partition_scheme' '$ZFSBOOT_PARTITION_SCHEME'
		                          '$msg_partition_scheme_help'
		'7 $msg_swap_size'        '$ZFSBOOT_SWAP_SIZE'
		                          '$msg_swap_size_help'
	" # END-QUOTE
	local defaultitem= # Calculated below
	local hline="$hline_alnum_arrows_punc_tab_enter"

	local height width rows
	eval f_dialog_menu_with_help_size height width rows \
		\"\$title\" \"\$btitle\" \"\$prompt\" \"\$hline\" $menu_list

	# Obtain default-item from previously stored selection
	f_dialog_default_fetch defaultitem

	local menu_choice
	menu_choice=$( eval $DIALOG \
		--title \"\$title\"              \
		--backtitle \"\$btitle\"         \
		--hline \"\$hline\"              \
		--item-help                      \
		--ok-label \"\$msg_select\"      \
		--cancel-label \"\$msg_cancel\"  \
		--default-item \"\$defaultitem\" \
		--menu \"\$prompt\"              \
		$height $width $rows             \
		$menu_list                       \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	)
	local retval=$?
	f_dialog_data_sanitize menu_choice
	f_dialog_menutag_store "$menu_choice"

	# Only update default-item on success
	[ $retval -eq $DIALOG_OK ] && f_dialog_default_store "$menu_choice"

	return $retval
}

# dialog_edit_disks
#
# Edit the list of disks to be used by the ZFS boot pool.
#
dialog_edit_disks()
{
	local title="$DIALOG_TITLE"
	local btitle="$DIALOG_BACKTITLE"
	local prompt="$msg_please_select_one_or_more_disks"
	local check_list= # Calculated below
	local hline="$hline_arrows_space_tab_enter"
	local dev vardev disks=

	#
	# Get a [new] list of disk devices
	#
	f_device_find "" $DEVICE_TYPE_DISK disks
	if [ ! "$disks" ]; then
		f_show_msg "$msg_no_disks_present_to_configure"
		return $FAILURE
	fi

	# Lets sort the disks array to be more user friendly
	disks=$( echo "$disks" | tr ' ' '\n' | sort | tr '\n' ' ' )

	#
	# Loop through the list of selected disks and create temporary local
	# variables mapping their status onto an up-to-date list of disks.
	#
	for dev in $ZFSBOOT_DISKS; do
		f_str2varname "$dev" vardev
		local _${vardev}_status=on
	done

	#
	# Create the checklist menu of discovered disk devices
	#
	local on_off
	for dev in $disks; do
		local desc=
		device_$dev get desc desc
		f_shell_escape "$desc" desc
		f_str2varname "$dev" vardev
		f_getvar _${vardev}_status:-off on_off
		check_list="$check_list '$dev' '$desc' $on_off"
	done

	#
	# Prompt the user to check some disks
	#
	local height width rows
	eval f_dialog_checklist_size height width rows \
		\"\$title\" \"\$btitle\" \"\$prompt\" \"\$hline\" $check_list
	disks=$( eval $DIALOG \
		--title \"\$DIALOG_TITLE\"         \
		--backtitle \"\$DIALOG_BACKTITLE\" \
		--hline \"\$hline\"                \
		--ok-label \"\$msg_ok\"            \
		--cancel-label \"\$msg_cancel\"    \
		--checklist \"\$prompt\"           \
		$height $width $rows               \
		$check_list                        \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	) || return $?
		# Exit if user either pressed ESC or chose Cancel/No
	f_dialog_data_sanitize disks

	ZFSBOOT_DISKS="$disks"

	return $DIALOG_OK
}

# dialog_menu_vdev
#
# Prompt the user to select a a Virtual Device type.
#
dialog_menu_vdev()
{
	local title="$DIALOG_TITLE"
	local btitle="$DIALOG_BACKTITLE"
	local prompt="$msg_select_virtual_device_type"

	# Make sure [potentially scripted] selections are real
	real_disks=
	for disk in $ZFSBOOT_DISKS; do
		f_struct device_$disk && real_disks="$real_disks $disk"
	done
	# Make sure we have at least one real disk selected
	ndisks=$( set -- $real_disks; echo $# )

	local menu_list="
		'stripe' '$msg_stripe_desc' '$msg_stripe_help'
		'mirror' '$msg_mirror_desc' '$msg_mirror_help'
		'raidz1' '$msg_raidz1_desc' '$msg_raidz1_help'
		'raidz2' '$msg_raidz2_desc' '$msg_raidz2_help'
		'raidz3' '$msg_raidz3_desc' '$msg_raidz3_help'
	" # END-QUOTE

	local defaultitem="$ZFSBOOT_VDEV_TYPE"
	local hline="$hline_arrows_tab_enter"
	local error_msg revalidate_choice

	local mheight mwidth mrows
	eval f_dialog_menu_size mheight mwidth mrows \
		\"\$title\" \"\$btitle\" \"\$prompt\" \"\$hline\" $menu_list
	local iheight iwidth
	f_dialog_infobox_size iheight iwidth \
		"$DIALOG_TITLE" "$DIALOG_BACKTITLE" "$msg_processing_selection"

	local menu_choice
	menu_choice=$( eval $DIALOG \
		--title \"\$title\"              \
		--backtitle \"\$btitle\"         \
		--hline \"\$hline\"              \
		--ok-label \"\$msg_ok\"          \
		--cancel-label \"\$msg_cancel\"  \
		--item-help                      \
		--default-item \"\$defaultitem\" \
		--menu \"\$prompt\"              \
		$mheight $mwidth $mrows          \
		$menu_list                       \
		--and-widget                     \
		${USE_XDIALOG:+--no-buttons}     \
		--infobox \"\$msg_processing_selection\" \
		$iheight $iwidth                 \
		2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
	) || return $FAILURE
	f_dialog_data_sanitize menu_choice
	sleep 0.5 # Give time to read `--and-widget --info-box'

	# Make sure we have enough disks for the desired vdev type
	case "$menu_choice" in
	stripe) want_disks=1 ;;
	mirror) want_disks=2 ;;
	raidz1) want_disks=3 ;;
	raidz2) want_disks=4 ;;
	raidz3) want_disks=5 ;;
	*)
		f_show_msg "$msg_invalid_virtual_device_type" \
	                   "$menu_choice"
		continue
	esac
	if [ $ndisks -lt $want_disks ]; then
		msg_yes="$msg_change" msg_no="$msg_cancel" f_yesno \
			"%s: $msg_not_enough_disks_selected\n%s" \
			"$menu_choice" $ndisks $want_disks \
			"$msg_invalid_virtual_device_type_help" ||
			return $FAILURE
		dialog_menu_vdev
	else
		ZFSBOOT_VDEV_TYPE="$menu_choice"
	fi
}

# zfs_create_diskpart $disk $index
#
# For each block device to be used in the zpool, rather than just create the
# zpool with the raw block devices (e.g., da0, da1, etc.) we create partitions
# so we can have some real swap. This also provides wiggle room incase your
# replacement drivers do not have the exact same sector counts.
#
# NOTE: The MBR layout is more complicated (GPT is preferred).
#
zfs_create_diskpart()
{
	local disk="$1" index="$2"
	local funcname=zfs_create_diskpart
	local disksize partsize

	# Check arguments
	[ "$disk" -a "$index" ] || return $FAILURE

	#
	# Destroy whatever partition layout is currently on disk.
	# NOTE: `-F' required to destroy if partitions still exist.
	# NOTE: Failure is ok here, blank disk will have nothing to destroy.
	#
	f_quietly gpart destroy -F $disk
	f_quietly zpool labelclear -f /dev/$disk # Kill it with fire

	# Make doubly-sure backup GPT is destroyed
	f_quietly gpart create -s gpt $disk || return $FAILURE
	f_quietly gpart destroy -F $disk || return $FAILURE

	# Calculate partition size given desired amount of swap
	device_$disk get capacity disksize || return $FAILURE
	partsize=$(( $disksize - $swapsize ))

	#
	# Lay down the desired type of partition scheme
	#
	local setsize mbrindex
	case "$ZFSBOOT_PARTITION_SCHEME" in
	""|GPT)
		#
		# 1. Create GPT layout using labels
		#
		gpart create -s gpt $disk || return $FAILURE

		#
		# 2. Add small freebsd-boot partition labeled `boot#'
		#
		gpart add -l gptboot$index -t freebsd-boot -s 512k $disk ||
			return $FAILURE
		gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 $disk ||
			return $FAILURE

		# zpool will use the `zfs#' GPT labels
		bootpart=p2 targetpart=p2

		# Change things around if we are using GELI
		if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
			bootpart=p2 targetpart=p3
			partsize=$(( $partsize - $gelisize ))
			gpart add -l boot$index -t freebsd-zfs \
				-s ${gelisize}b -a 1m $disk || return $FAILURE
			# Pedantically nuke any old labels, stop geli
			f_quietly zpool labelclear -f /dev/$disk$bootpart
			f_quietly geli detach -f /dev/$disk$targetpart
		fi

		#
		# 3. Add freebsd-zfs partition labeled `zfs#' for zpool
		# NOTE: Using above calculated partsize to leave room for swap.
		#
		[ $swapsize -gt 0 ] && setsize="-s ${partsize}b"
		gpart add -l zfs$index -t freebsd-zfs $setsize -a 1m $disk ||
			return $FAILURE
		f_quietly zpool labelclear -f /dev/$disk$targetpart # Pedantic

		#
		# 4. Add freebsd-swap partition labeled `swap#'
		#
		if [ $swapsize -gt 0 ]; then
			gpart add -l swap$index -t freebsd-swap -a 1m $disk ||
				return $FAILURE
			# Update fstab(5)
			printf "$fstab_fmt" \
				/dev/gpt/swap$index none swap sw 0 0 \
				>> $BSDINSTALL_TMPETC/fstab || return $FAILURE
		fi
		;;

	MBR)
		#
		# 1. Create MBR layout (no labels)
		#
		gpart create -s mbr $disk || return $FAILURE
		gpart bootcode -b /boot/boot0 $disk || return $FAILURE

		#
		# 2. Add freebsd slice with all available space
		#
		gpart add -t freebsd $disk || return $FAILURE
		gpart set -a active -i 1 $disk || return $FAILURE
		f_quietly zpool labelclear -f /dev/${disk}s1 # Pedantic
		f_quietly gpart destroy -F ${disk}s1 # Pedantic

		#
		# 3. Write BSD sceme to the freebsd slice
		#
		gpart create -s BSD ${disk}s1 || return $FAILURE

		# zpool will use s1a (no labels)
		bootpart=s1a targetpart=s1a mbrindex=1

		# Change things around if we are using GELI
		if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
			bootpart=s1a targetpart=s1d
			partsize=$(( $partsize - $gelisize ))
			mbrindex=4 # If this is s1a then make the zpool s1d
			gpart add -t freebsd-zfs -i 1 -s ${gelisize}b \
				${disk}s1 || return $FAILURE
			# Pedantically nuke any old labels, stop geli
			f_quietly zpool labelclear -f /dev/$disk$bootpart
			f_quietly geli detach -f /dev/$disk$targetpart
		fi

		#
		# 4. Partition the BSD slice for ZFS
		# NOTE: Using above calculated partsize to leave room for swap.
		#
		[ $swapsize -gt 0 ] && setsize="-s ${partsize}b"
		gpart add -t freebsd-zfs -i $mbrindex $setsize ${disk}s1 ||
			return $FAILURE
		f_quietly zpool labelclear -f /dev/$disk$targetpart # Pedantic

		#
		# 5. Add freebsd-swap partition
		#
		if [ $swapsize -gt 0 ]; then
			gpart add -t freebsd-swap -i 2 ${disk}s1 ||
				return $FAILURE
			# Update fstab(5)
			printf "$fstab_fmt" /dev/${disk}s1b none swap sw 0 0 \
				>> $BSDINSTALL_TMPETC/fstab || return $FAILURE
		fi
		;;

	*)
		printf "%s: %s is an unsupported partition scheme" \
		       "$funcname" "$ZFSBOOT_PARTITION_SCHEME" >&2
		return $FAILURE

	esac # $ZFSBOOT_PARTITION_SCHEME

	return $SUCCESS
}

# zfs_create_boot $poolname $vdev_type $real_disks ...
#
# Creates boot pool and dataset layout. Returns error if something goes wrong.
# Errors are printed to stderr for collection and display.
#
zfs_create_boot()
{
	local poolname="$1" vdev_type="$2"
	local fstab_fmt="%s\t\t%s\t%s\t%s\t\t%s\t%s\n"
	local funcname=zfs_create_boot
	local bootpart targetpart

	shift 2 # name vdev_type

	# We may need this later
	local realdisks=$*

	# Pedantic checks; should never be seen
	if [ ! "$poolname" ]; then
		echo "$funcname: NULL poolname" >&2
		return $FAILURE
	fi
	if [ $# -lt 1 ]; then
		echo "$funcname: missing disk arguments" >&2
		return $FAILURE
	fi

	# Initialize fstab(5)
	printf "$fstab_fmt" \
		"# Device" Mountpoint FStype Options Dump "Pass#" \
		>> $BSDINSTALL_TMPETC/fstab || return $FAILURE

	# Expand SI units in desired sizes
	local swapsize gelisize
	f_expand_number "$ZFSBOOT_SWAP_SIZE" swapsize || return $FAILURE
	f_expand_number "$ZFSBOOT_GELI_BOOT_SIZE" gelisize || return $FAILURE

	# Prepare the disks
	local n=0
	for disk in $*; do
		zfs_create_diskpart $disk $n || return $FAILURE
		n=$(( $n + 1 ))
	done

	# MBR boot loader hack part 1
	# We have to do this early because geli gets in the way later
	if [ "$ZFSBOOT_PARTITION_SCHEME" = "MBR" ]; then
		for disk in $realdisks; do
			dd if=/boot/zfsboot of=/dev/${disk}s1 count=1 ||
				return $FAILURE
		done
	fi

	# Forced 4k alignment support provided by Geom NOP (see gnop(8))
	local unenc_list=
	if [ "$ZFSBOOT_GNOP_4K_FORCE_ALIGN" ]; then
		local new_list=
		for disk in $*; do
			if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
				# We don't gnop the encrypted partition
				# because geli will do this for us
				# gnop the unencrypted disk
				gnop create -S 4096 $disk$bootpart ||
					return $FAILURE
				unenc_list="$unenc_list $disk$bootpart.nop"
			else
				gnop create -S 4096 $disk$targetpart ||
					return $FAILURE
				new_list="$new_list $disk$targetpart.nop"
			fi
		done
		set -- $new_list
	else
		local new_list=
		for disk in $*; do
			new_list="$new_list $disk$targetpart"
			[ "$ZFSBOOT_GELI_ENCRYPTION" ] &&
				unenc_list="$unenc_list $disk$bootpart"
		done
		set -- $new_list
	fi

	#
	# If encryption is enabled, we need to create the GEOMs
	#
	if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
		local bootvdev=
		local geli_pool="$BSDINSTALL_CHROOT/$ZFSBOOT_GELI_POOL_NAME"
		local key="$ZFSBOOT_GELI_KEY_FILE"

		# Create the parent directories for our unencrypted pool
		f_quietly umount /mnt
		mount -t tmpfs none $BSDINSTALL_CHROOT || return $FAILURE

		# Create mirror across the unencrypted partition on all disks
		[ $( set -- $unenc_list; echo $# ) -gt 1 ] && bootvdev=mirror

		zpool create -o altroot=$BSDINSTALL_CHROOT \
			-m "/$ZFSBOOT_GELI_POOL_NAME" -f \
			"$ZFSBOOT_GELI_POOL_NAME" $bootvdev $unenc_list ||
			return $FAILURE
		mkdir -p $geli_pool/boot || return $FAILURE

		# Generate an encryption key using random(4)
		dd if=/dev/random of="$geli_pool/$key" bs=4096 count=1 ||
			return $FAILURE

		# Create the geli(8) GEOMS
		local geli_list
		msg_enter_new_password="$msg_geli_password" \
			f_dialog_input_password || return $FAILURE
		f_dialog_info "$msg_geli_setup" \
			2>&1 >&$DIALOG_TERMINAL_PASSTHRU_FD
		for disk in $realdisks; do
			echo "$pw_password" | geli init -b -B \
				"$geli_pool/boot/$disk$targetpart.eli" \
				-e AES-XTS -J - -K "$geli_pool/$key" -l 256 \
				-s 4096 $disk$targetpart || return $FAILURE
			echo "$pw_password" | geli attach -j - \
				-k "$geli_pool/$key" $disk$targetpart ||
				return $FAILURE
			geli_list="$geli_list $disk$targetpart.eli"
		done
		set -- $geli_list
		zfs unmount "$ZFSBOOT_GELI_POOL_NAME" || return $FAILURE
		f_quietly umount /mnt # done with tmpfs
	fi

	#
	# Create the ZFS pool with desired type and disk devices
	#
	zpool create -o altroot=$BSDINSTALL_CHROOT -m none -f \
		"$poolname" $vdev_type $* || return $FAILURE

	# Customize the zpool a bit...
	zfs set checksum=fletcher4	"$poolname" || return $FAILURE
	zfs set atime=off		"$poolname" || return $FAILURE

	#
	# Create ZFS dataset layout within the new boot pool
	#
	echo "$ZFSBOOT_DATASETS" | while read dataset options; do
		# Skip blank lines and comments
		case "$dataset" in "#"*|"") continue; esac
		# Remove potential inline comments in options
		options="${options%%#*}"
		# Replace tabs with spaces
		f_replaceall "$options" "	" " " options
		# Reduce contiguous runs of space to one single space
		oldoptions=
		while [ "$oldoptions" != "$options" ]; do
			oldoptions="$options"
			f_replaceall "$options" "  " " " options
		done
		# Replace both commas and spaces with ` -o '
		f_replaceall "$options" "[ ,]" " -o " options
		# Create the dataset with desired options
		zfs create ${options:+-o $options} "$poolname$dataset" ||
			return $FAILURE
	done

	# Touch up permissions on the tmp directories
	chmod 1777 $BSDINSTALL_CHROOT/tmp || return $FAILURE
	chmod 1777 $BSDINSTALL_CHROOT/var/tmp || return $FAILURE

	# Create symlink(s)
	[ "$ZFSBOOT_GELI_ENCRYPTION" ] &&
		{ ln -s $ZFSBOOT_GELI_POOL_NAME/boot $BSDINSTALL_CHROOT/boot ||
			return $FAILURE; }

	# Set bootfs property
	zpool set bootfs="$poolname/$ZFSBOOT_BEROOT_NAME/$ZFSBOOT_BOOTFS_NAME" \
		"$poolname" || return $FAILURE

	# Export the pool(s)
	zpool export "$poolname" || return $FAILURE
	[ "$ZFSBOOT_GELI_ENCRYPTION" ] &&
		{ zpool export "$ZFSBOOT_GELI_POOL_NAME" || return $FAILURE; }

	# Destroy the gnop devices (if enabled)
	for disk in ${ZFSBOOT_GNOP_4K_FORCE_ALIGN:+$realdisks}; do
		if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
			f_quietly gnop destroy $disk$bootpart.nop
		else
			f_quietly gnop destroy $disk$targetpart.nop
		fi
	done

	# MBR boot loader hack part 2
	if [ "$ZFSBOOT_PARTITION_SCHEME" = "MBR" ]; then
		# Stick the ZFS boot loader in the "convienient hole" after
		# the ZFS internal metadata
		for disk in $realdisks; do
			dd if=/boot/zfsboot of=/dev/$disk$bootpart \
				skip=1 seek=1024 || return $FAILURE
		done
	fi

	# Re-import the ZFS pool(s)
	zpool import -o altroot=$BSDINSTALL_CHROOT $poolname ||	return $FAILURE
	[ "$ZFSBOOT_GELI_ENCRYPTION" ] &&
		{ zpool import -o altroot=$BSDINSTALL_CHROOT \
			"$ZFSBOOT_GELI_POOL_NAME" || return $FAILURE; }

	# While this is apparently not needed, it seems to help MBR
	mkdir -p $BSDINSTALL_CHROOT/boot/zfs || return $FAILURE
	zpool set cachefile=$BSDINSTALL_CHROOT/boot/zfs/zpool.cache \
		"$poolname" || return $FAILURE

	# Last, but not least... add required lines to rc.conf(5)
	# NOTE: We later concatenate these into their destination
	echo 'zfs_enable="YES"' > $BSDINSTALL_TMPETC/rc.conf.zfs ||
		return $FAILURE
	echo 'zfs_load="YES"' > $BSDINSTALL_TMPBOOT/loader.conf.zfs ||
		return $FAILURE

	# We're all done unless we should go on to do encryption
	[ "$ZFSBOOT_GELI_ENCRYPTION" ] || return $SUCCESS

	#
	# Configure geli(8)-based encryption
	#
	echo 'aesni_load="YES"' \
		> $BSDINSTALL_TMPBOOT/loader.conf.aesni || return $FAILURE
	echo 'geom_eli_load="YES"' \
		> $BSDINSTALL_TMPBOOT/loader.conf.geli || return $FAILURE
	printf 'vfs.root.mountfrom="zfs:%s/%s/%s"\n' "$poolname" \
		"$ZFSBOOT_BEROOT_NAME" "$ZFSBOOT_BOOTFS_NAME" \
		> $BSDINSTALL_TMPBOOT/loader.conf.root || return $FAILURE
	for disk in $realdisks; do
		printf 'geli_%s_keyfile0_load="YES"\n' \
			"$disk$targetpart" \
			> $BSDINSTALL_TMPBOOT/loader.conf.$disk$targetpart ||
			return $FAILURE
		printf 'geli_%s_keyfile0_type="%s:geli_keyfile0"\n' \
			"$disk$targetpart" "$disk$targetpart" \
			>> $BSDINSTALL_TMPBOOT/loader.conf.$disk$targetpart ||
			return $FAILURE
		printf 'geli_%s_keyfile0_name="%s"\n' \
			"$disk$targetpart" "$ZFSBOOT_GELI_KEY_FILE" \
			>> $BSDINSTALL_TMPBOOT/loader.conf.$disk$targetpart ||
			return $FAILURE
	done

	return $SUCCESS
}

# dialog_menu_diskinfo
#
# Prompt the user to select a disk and then provide detailed info on it.
#
dialog_menu_diskinfo()
{
	local disk

	#
	# Break from loop when user cancels disk selection
	#
	while :; do
		disk=$( msg_cancel="$msg_back" f_device_menu \
			"$DIALOG_TITLE" "$msg_select_a_disk_device" "" \
			$DEVICE_TYPE_DISK 2>&1 ) || break

		# Show gpart(8) `show' and camcontrol(8) `inquiry' data
		f_show_msg "$msg_detailed_disk_info" \
			"$disk" "$( gpart show $disk 2> /dev/null )" \
			"$disk" "$( camcontrol inquiry $disk 2> /dev/null )" \
			"$disk" "$( camcontrol identify $disk 2> /dev/null )"
	done

	return $SUCCESS
}

############################################################ MAIN

#
# Initialize
#
f_dialog_title "$msg_zfs_configuration"
f_dialog_backtitle "$msg_freebsd_installer"

# User may have specifically requested ZFS-related operations be interactive
! f_interactive && f_zfsinteractive && unset $VAR_NONINTERACTIVE

#
# Loop over the main menu until we've accomplished what we came here to do
#
while :; do
	if ! f_interactive; then
		retval=$DIALOG_OK
		mtag=">>> $msg_create"
	else
		dialog_menu_main
		retval=$?
		f_dialog_menutag_fetch mtag
	fi

	f_dprintf "retval=%u mtag=[%s]" $reval "$mtag"
	[ $retval -eq $DIALOG_OK ] || f_die

	case "$mtag" in
	">>> $msg_create")
		#
		# First, validate the user's selections
		#

		# Make sure they gave us a name for the pool
		if [ ! "$ZFSBOOT_POOL_NAME" ]; then
			f_show_msg "$msg_pool_name_cannot_be_empty"
			f_interactive || f_die
			continue
		fi
		# Make sure [potentially scripted] selections are real
		real_disks=
		for disk in $ZFSBOOT_DISKS; do
			f_struct device_$disk && real_disks="$real_disks $disk"
		done
		# Make sure we have at least one real disk selected
		ndisks=$( set -- $real_disks; echo $# )
		if [ $ndisks -lt 1 ]; then
			f_show_msg "$msg_no_disks_selected"
			f_interactive || f_die
			continue
		fi
		# Make sure we have enough disks for the desired vdev type
		case "$ZFSBOOT_VDEV_TYPE" in
		stripe) want_disks=1 ;;
		mirror) want_disks=2 ;;
		raidz1) want_disks=3 ;;
		raidz2) want_disks=4 ;;
		raidz3) want_disks=5 ;;
		*)
			f_show_msg "$msg_invalid_virtual_device_type" \
		                   "$ZFSBOOT_VDEV_TYPE"
			f_interactive || f_die
			continue
		esac
		if [ $ndisks -lt $want_disks ]; then
			f_show_msg "%s: $msg_not_enough_disks_selected" \
			           "$ZFSBOOT_VDEV_TYPE" "$want_disks"
			f_interactive || f_die
			continue
		fi
		# Make sure each disk will be at least 50% ZFS
		if f_expand_number "$ZFSBOOT_SWAP_SIZE" swapsize &&
		   f_expand_number "$ZFSBOOT_GELI_BOOT_SIZE" gelisize
		then
			minsize=$swapsize teeny_disks=
			[ "$ZFSBOOT_GELI_ENCRYPTION" ] &&
				minsize=$(( $minsize + $gelisize ))
			for disk in $real_disks; do
				device_$disk get capacity disksize || continue
				disksize=$(( $disksize - $minsize ))
				[ $disksize -lt $minsize ] &&
					teeny_disks="$teeny_disks $disk"
			done
			if [ "$teeny_disks" ]; then
				f_show_msg "$msg_these_disks_are_too_small" \
				           "$ZFSBOOT_SWAP_SIZE" \
				           "$ZFSBOOT_GELI_BOOT_SIZE" \
				           "$teeny_disks"
				f_interactive || f_die
				continue
			fi
		fi

		#
		# Last Chance!
		#
		if [ ! "$USE_XDIALOG" ]; then
			f_interactive && DIALOG="$DIALOG --colors" f_noyes \
				"$msg_last_chance_are_you_sure_color" \
				"$ZFSBOOT_DISKS" || continue
		else
			f_interactive && f_noyes \
				"$msg_last_chance_are_you_sure" \
				"$ZFSBOOT_DISKS" || continue
		fi

		#
		# Let's do this
		#

		vdev_type="$ZFSBOOT_VDEV_TYPE"

		# Blank the vdev type for the default layout
		[ "$vdev_type" = "stripe" ] && vdev_type=

		if ! error=$( zfs_create_boot "$ZFSBOOT_POOL_NAME" \
			"$vdev_type" $real_disks 2>&1 )
		then
			f_dialog_msgbox "$error"
			f_interactive || f_die
			continue
		fi

		break # to success
		;;
	"- $msg_rescan_devices") f_device_rescan ;;
	"- $msg_disk_info") dialog_menu_diskinfo ;;
	?" $msg_pool_name")
		# Prompt the user to input/change the name for the new pool
		f_dialog_input input \
			"$msg_please_enter_a_name_for_your_zpool" \
			"$ZFSBOOT_POOL_NAME" &&
			ZFSBOOT_POOL_NAME="$input"
		;;
	?" $msg_disks_to_use") dialog_edit_disks ;;
	?" $msg_zfs_vdev_type") dialog_menu_vdev ;;
	?" $msg_force_4k_sectors")
		# Toggle the variable referenced both by the menu and later
		if [ "$ZFSBOOT_GNOP_4K_FORCE_ALIGN" ]; then
			ZFSBOOT_GNOP_4K_FORCE_ALIGN=
		else
			ZFSBOOT_GNOP_4K_FORCE_ALIGN=1
		fi
		;;
	?" $msg_geli_encryption")
		# Toggle the variable referenced both by the menu and later
		if [ "$ZFSBOOT_GELI_ENCRYPTION" ]; then
			ZFSBOOT_GELI_ENCRYPTION=
		else
			ZFSBOOT_GELI_ENCRYPTION=1
		fi
		;;
	?" $msg_partition_scheme")
		# Toggle between GPT and MBR
		if [ "$ZFSBOOT_PARTITION_SCHEME" = GPT ]; then
			ZFSBOOT_PARTITION_SCHEME=MBR
		else
			ZFSBOOT_PARTITION_SCHEME=GPT
		fi
		;;
	?" $msg_swap_size")
		# Prompt the user to input/change the swap size for each disk
		f_dialog_input input \
			"$msg_please_enter_amount_of_swap_space" \
			"$ZFSBOOT_SWAP_SIZE" &&
			ZFSBOOT_SWAP_SIZE="$input"
		;;
	esac
done

return $SUCCESS

################################################################################
# END
################################################################################