xref: /freebsd-11-stable/tools/tools/nanobsd/embedded/common

# $FreeBSD: stable/11/tools/tools/nanobsd/embedded/common 323738 2017-09-19 07:56:24Z n_hibma $

#-
# Copyright (c) 2015 Warner Losh. All Rights Reserved.
# Copyright (c) 2010-2011 iXsystems, Inc., 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 iXsystems, Inc 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.
#
#
# This file is heavily derived from both Sam Leffler's Avilia config,
# as well as the BSDRP project's config file.  Neither of these have
# an explicit copyright/license statement, but are implicitly BSDL. This
# example has been taken from the FreeNAS project (an early version) and
# simplified to meet the needs of the example.
#

# NB: You want the other file as the command line arg :)

# Missing in base:
# o mkimg setting active partition
# o mkimg starting at arbitrary offset (needed for A10, et al)
# o mtools still needed because we have no makefs -t msdos
# o nanobsd doesn't record changes to WORLDTEMP in customization
#   scripts yet, so we have kludge to pick up all files
# o easy way for pkg to grab files from other repos and put that
#   data on the image
# o Need to have some way to create / resize the s4 slice to do ping
#   pong bouncing between s3 and s4 for an arbitrary image. we can resize
#   one slice, not two
# o hints in the uboot ports for how to create the image
#
# Missing here
# o documentation for how to run the qemu images
# o msdos mtools fallback
# o special boot for !x86 !arm platforms
# o qemu image for arm
# o qemu image for aarch64
# o qemu image for armv6/armv7
# o easy support for different image / vm formats
# o need to promote much of this to nanobsd.sh and friends
# o uses old kludge to build image w/o ownership being right
#   for many files. Should move to mtree-dedup.awk.
# o support for EFI images
# o support for GPT partitioning
#
# Long Term
# o common tooling for creating images for odd-ball platforms
# o support for boot loaders other than uboot in the image
#   or via special insturctions
# o No pony support. Sadly, you cannot have a pony.
#

if [ -z $NANO_NAME ]; then
	echo "NANO_NAME not defined. Use foo.cfg instead."
fi

NANO_SLICE_FAT_SIZE=32m
NANO_SLICE_CFG_SIZE=32m

NANO_BOOT2CFG="-P -S115200"

NANO_RAM_ETCSIZE=8192
NANO_RAM_TMPVARSIZE=8192
NANO_IMAGES=2

NANO_PMAKE="make -j $(sysctl -n hw.ncpu)"

NANO_CFG_BASE=$(pwd)
NANO_CFG_BASE=$(realpath ${NANO_CFG_BASE}/..)
NANO_SRC=$(realpath ${NANO_CFG_BASE}/../../..)
#### XXX share obj 
if [ -z ${NANO_CPUTYPE} ]; then
	NANO_OBJ=${NANO_SRC}/../embedded/obj
else
	# Alas, I can't set OBJTREE to ${MACHINE}.${MACHINE_ARCH}.${CPUTYPE}
	# so this will have to do until I can.
	NANO_OBJ=${NANO_SRC}/../embedded/obj.${NANO_CPUTYPE}
fi
NANO_LOG=${NANO_OBJ}/../${NANO_NAME}
NANO_DISKIMGDIR=${NANO_OBJ}/../images
NANO_WORLDDIR=${NANO_LOG}/_.w
NANO_INIT_IMG2=0
NANO_NOPRIV_BUILD=t
unset MAKEOBJDIRPREFIX

mkdir -p ${NANO_OBJ}
NANO_OBJ=$(realpath ${NANO_OBJ})
mkdir -p ${NANO_LOG}
NANO_LOG=$(realpath ${NANO_LOG})
mkdir -p ${NANO_WORLDDIR}
NANO_WORLDDIR=$(realpath ${NANO_WORLDDIR})
mkdir -p ${NANO_DISKIMGDIR}
NANO_DISKIMGDIR=$(realpath ${NANO_DISKIMGDIR})

NANO_FAT_DIR=${NANO_LOG}/_.fat

customize_cmd cust_allow_ssh_root

add_etc_make_conf ( ) (
	touch ${NANO_WORLDDIR}/etc/make.conf
)
customize_cmd add_etc_make_conf

cust_install_machine_files ( ) (
	echo "cd ${NANO_CFG_BASE}/Files"
	cd ${NANO_CFG_BASE}/Files
	find . -print | grep -Ev '/(CVS|\.svn|\.hg|\.git)' | cpio -dumpv ${NANO_WORLDDIR}
)
customize_cmd cust_install_files
customize_cmd cust_install_machine_files 

# NB: leave c++ enabled so devd can be built
CONF_BUILD="
WITHOUT_ACPI=true
WITHOUT_ATM=true
WITHOUT_AUDIT=true
WITHOUT_BIND_DNSSEC=true
WITHOUT_BIND_ETC=true
WITHOUT_BIND_LIBS_LWRES=true
WITHOUT_BLUETOOTH=true
WITHOUT_CALENDAR=true
WITHOUT_CVS=true
WITHOUT_DICT=true
WITHOUT_EXAMPLES=true
WITHOUT_FORTRAN=true
WITHOUT_GAMES=true
WITHOUT_GCOV=true
WITHOUT_GPIB=true
WITHOUT_HTML=true
WITHOUT_I4B=true
WITHOUT_IPFILTER=true
WITHOUT_IPX=true
WITHOUT_LIBKSE=true
WITHOUT_LOCALES=true
WITHOUT_LPR=true
WITHOUT_MAN=true
WITHOUT_NETCAT=true
WITHOUT_NIS=true
WITHOUT_NLS=true
WITHOUT_NS_CACHING=true
WITHOUT_OBJC=true
WITHOUT_PROFILE=true
WITHOUT_RCMDS=true
WITHOUT_SENDMAIL=true
WITHOUT_SHAREDOCS=true
WITHOUT_SYSCONS=true
WITHOUT_LIB32=true
WITHOUT_TESTS=true
WITHOUT_DEBUG_FILES=t
WITHOUT_KERNEL_SYMBOLS=t
"
CONF_INSTALL="$CONF_BUILD
INSTALL_NODEBUG=t
NOPORTDOCS=t
NO_INSTALL_MANPAGES=t
"
# The following would help...
# WITHOUT_TOOLCHAIN=true		can't build ports
# WITHOUT_INSTALLLIB=true		libgcc.a
#
# from the build
# WITHOUT_INFO=true			makeinfo
# WITHOUT_RCS=true
PKG_ONLY_MAKE_CONF="
WITHOUT_TOOLCHAIN=true
WITHOUT_INSTALLLIB=true
WITHOUT_INFO=true
WITHOUT_RCS=true
"

NANO_PACKAGE_ONLY=1

# Creates images for all the formats that use MBR / GPT
# split later if the #ifdef soup gets too bad.
create_diskimage_gpt ( ) (
	pprint 2 "build diskimage gpt ${NANO_NAME}"

	create_diskimage_mbr $*
)

create_diskimage_mbr ( ) (

	pprint 2 "build diskimage ${NANO_NAME}"
	pprint 3 "log: ${NANO_LOG}/_.di"

	(
	local extra i sz fmt fmtarg bootmbr bootbsd skiparg
	set -o xtrace

	[ -z ${NANO_DISKIMAGE_FORMAT} ] || fmtarg="-f ${NANO_DISKIMAGE_FORMAT}"
	[ -z ${NANO_DISKIMAGE_FORMAT} ] || fmt=".${NANO_DISKIMAGE_FORMAT}"
	bootmbr=${NANO_BOOT_MBR:+-b ${NANO_BOOT_MBR}}
	bootbsd=${NANO_BOOT_BSD:+-b ${NANO_BOOT_BSD}}
	skiparg=${NANO_MBR_FIRST_SKIP:+-S ${NANO_MBR_FIRST_SKIP}}

	for i in s1 s2 s3 s4 p1 p2 p3 p4 p5 empty; do
		rm -fr ${NANO_LOG}/_.${i}*
	done

	# Populate the FAT partition, if needed
	if [ -n "${NANO_SLICE_FAT}" ]; then
		echo Creating MSDOS partition for kernel
		newfs_msdos -C ${NANO_SLICE_FAT_SIZE} -F 16 -L ${NANO_NAME} \
			${NANO_LOG}/_.${NANO_SLICE_FAT}
		if [ -d ${NANO_FAT_DIR} ]; then
			# Need to copy files from ${NANO_FATDIR} with mtools, or use
			# makefs -t msdos once that's supported
			mcopy -i ${NANO_LOG}/_.${NANO_SLICE_FAT} ${NANO_FAT_DIR}/* ::
		fi
	fi

	# Populate the Powerpc boot image, if needed
	if [ "${NANO_LAYOUT}" = powerpc64-ibm ]; then
		dd if=${NANO_WORLDDIR}/boot/boot1.elf of=${NANO_LOG}/_.s1 bs=800k count=1 conv=sync
	fi

	# Populate the / partition, and place it into a slice with a
	# bsd label
	[ -z ${NANO_NOPRIV_BUILD} ] || extra="-F ${NANO_METALOG}"
	sz=${NANO_SLICE_ROOT_SIZE:+-s ${NANO_SLICE_ROOT_SIZE}}
	eval "${NANO_MAKEFS_UFS}" ${extra} $sz "${NANO_LOG}/_.${NANO_ROOT}" \
		"${NANO_WORLDDIR}"
	case ${NANO_DISK_SCHEME} in
	mbr)
		mkimg -s bsd ${bootbsd} -p freebsd-ufs:=${NANO_LOG}/_.${NANO_ROOT} \
			-o ${NANO_LOG}/_.${NANO_SLICE_ROOT}
		eval $NANO_SLICE_CFG=freebsd
		eval $NANO_SLICE_ROOT=freebsd
		;;
	gpt)
		eval $NANO_SLICE_CFG=freebsd-ufs
		eval $NANO_SLICE_ROOT=freebsd-ufs
		;;
	esac

	# Populate the /cfg partition, empty if none given
	if [ -z "${NANO_CFGDIR}" ]; then
		echo "Faking cfg dir, it's empty"
		NANO_CFGDIR=${NANO_LOG}/_.empty
		mkdir -p ${NANO_CFGDIR}
	fi
	# XXX -F cfg-mtree
	eval "${NANO_MAKEFS_UFS}" -s ${NANO_SLICE_CFG_SIZE} \
		"${NANO_LOG}/_.${NANO_SLICE_CFG}" "${NANO_CFGDIR}"

	# data slice not supported since we need the part for FAT for 
	# booting

	# Now shuffle all the slices together into the proper layout
	if [ -n "$NANO_SLICE_FAT" ]; then
		eval $NANO_SLICE_FAT=fat16b
	fi

	out=${NANO_DISKIMGDIR}/_.disk.image.${NANO_NAME}${fmt}
	# below depends on https://reviews.freebsd.org/D4403 not yet in the tree
	# but there's problems: it marks all partitions as active, so you have to
	# boot off parittion 3 or 2 by hand if you're playing around with this WIP
	case ${NANO_LAYOUT} in
	std-embedded)
		mkimg -a 3 ${skiparg} ${fmtarg} ${bootmbr} -s mbr -p ${s1}:=${NANO_LOG}/_.s1 \
			-p ${s2}:=${NANO_LOG}/_.s2 \
			-p ${s3}:=${NANO_LOG}/_.s3 \
			-o ${out}
		;;
	std-x86)
		# s1 is cfg, s2 is /, not sure how to make that
		# boot (marked as active) with mkimg yet
		mkimg -a 2 ${fmtarg} ${bootmbr} -s mbr -p ${s1}:=${NANO_LOG}/_.s1 \
			-p ${s2}:=${NANO_LOG}/_.s2 \
			-o ${out}
		;;
	std-uefi)
		# s1 is boot, s2 is cfg, s3 is /, not sure how to make that
		# boot (marked as active) with mkimg yet
		mkimg -a 2 ${fmtarg} ${bootmbr} -s mbr \
			-p efi:=${NANO_WORLDDIR}/boot/boot1.efifat \
			-p ${s2}:=${NANO_LOG}/_.s2 \
			-p ${s3}:=${NANO_LOG}/_.s3 \
			-o ${out}
		;;
	std-uefi-bios)
		# p1 is boot for uefi, p2 is boot for gpt, p3 is cfg, p4 is /
		# and p5 is alt-root (after resize)
		mkimg -a 2 ${fmtarg} ${bootmbr} -s gpt \
			-p efi:=${NANO_WORLDDIR}/boot/boot1.efifat \
			-p freebsd-boot:=${NAANO_WORLDDIR}/boot/gptboot \
			-p ${p3}:=${NANO_LOG}/_.p3 \
			-p ${p4}:=${NANO_LOG}/_.p4 \
			-o ${out}
		;;
	powerpc64-ibm)
		# A lie to make the boot loader work, it boots the first BSD partition
		# it finds, regardless of the active flag.
		s2=fat16b
		# boot image is on a special partition, ala std-embedded, but that
		# partition isn't FAT with special files, but a copy of the boot
		# loader itself.
		mkimg -a 1 ${fmtarg} -s mbr -p prepboot:=${NANO_LOG}/_.s1 \
			-p ${s2}:=${NANO_LOG}/_.s2 \
			-p ${s3}:=${NANO_LOG}/_.s3a \
			-o ${out}
		;;
	esac
	rm -f ${out}.xz
	xz -9 --keep ${out}
	) > ${NANO_LOG}/_.di 2>&1
)

die( ) {
	echo "$*"
	exit 1
}

# Automatically include the packaging port here so it is always first so it
# builds the port and adds the package so we can add other packages.
#XXX Doesn't work for cross build, so punting until I can integreate qemu-static
#XXX or poudere, both of which require priv'd execution. Or qemu-system, which
#XXX is super, super slow.
#add_port ports-mgmt/pkg
#add_port security/sudo
#add_port ftp/curl

rp=$(realpath ${NANO_OBJ}/)
__a=`mount | grep ${rp} | awk '{print length($3), $3;}' | sort -rn | awk '{$1=""; print;}'`
if [ -n "$__a" ]; then
    echo "unmounting $__a"
    umount $__a
fi

if [ "$DEBUG" = 1 ]; then
	DEBUG_BUILD="
DEBUG_FLAGS=		-g
"
else
	DEBUG_INSTALL="
INSTALL_NODEBUG=	t
"
fi

CONF_INSTALL="$CONF_BUILD
${DEBUG_BUILD}
"
CONF_INSTALL="$CONF_INSTALL
${DEBUG_INSTALL}
"

if [ "${NANO_PACKAGE_ONLY}" -eq 1 ]; then
 	CONF_INSTALL="${CONF_INSTALL}
${PKG_ONLY_MAKE_CONF}
"
	echo "Automatically building a thin image with packages"
else
	echo "Automatically building a * * F A T * * image so we can build ports"
fi

VARS="MASTER_SITE_BACKUP MASTER_SITE_OVERRIDE PACKAGEROOT PACKAGESITE"

for var in $VARS; do
	val=$(eval echo "\$$var")
	if [ -n "$val" ]; then
		CONF_INSTALL="${CONF_INSTALL}
$var=$val"
	fi
done

typical_embedded ( ) (
	# Need to create rc.conf before we copy over /etc to /conf/base/etc
	# so now's a good time.

	local rc=${NANO_WORLDDIR}/etc/rc.conf

	echo "hostname=nanobsd-${NANO_NAME}" > $rc
	echo "growfs_enable=YES" >> $rc
	echo "growfs_type=nanobsd-pingpong" >> $rc
	echo "ntpdate_enable=YES" >> $rc
	echo "ifconfig_DEFAULT=DHCP" >> $rc
	echo "ntpdate_hosts='0.freebsd.pool.ntp.org 1.freebsd.pool.ntp.org'" >> $rc
	# Make sure that firstboot scripts run so growfs works.
	# Note: still some issues remvoing this XXX
	touch ${NANO_WORLDDIR}/firstboot
)
customize_cmd typical_embedded

fix_pkg ( ) (
	chdir ${NANO_WORLDDIR}
	mkdir -p pkg
	mkdir -p pkg/db
	mkdir -p pkg/cache
	mkdir -p pkg/tmp		# Needed for pkg bootstrap
	mkdir -p usr/local/etc		# Will get moved to local/etc
	(
	echo 'PKG_DBDIR = "/pkg/db"'
	echo 'PKG_CACHEDIR = "/pkg/cache"'
	echo 'DEFAULT_ALWAYS_YES = "yes"'
	echo 'ASSUME_ALWAYS_YES = "yes"'
	) >> usr/local/etc/pkg.conf
	[ -z ${NANO_NOPRIV_BUILD} ] || (
	echo "./pkg type=dir uname=root gname=wheel mode=0755"
	echo "./pkg/cache type=dir uname=root gname=wheel mode=0755"
	echo "./pkg/db type=dir uname=root gname=wheel mode=0755"
	echo "./pkg/tmp type=dir uname=root gname=wheel mode=0755"
	) >> ${NANO_METALOG}
)
customize_cmd fix_pkg

save_build ( ) (
	VERSION_FILE=${NANO_WORLDDIR}/etc/version
	if [ "${SVNREVISION}" = "${REVISION}" ]; then
		echo "${NANO_NAME}" > "${VERSION_FILE}"
	else
		echo "${NANO_NAME} (${SVNREVISION})" > "${VERSION_FILE}"
	fi
)
customize_cmd save_build

shrink_md_fbsize ( ) (
	# We have a lot of little files on our memory disks. Let's decrease
	# the block and frag size to fit more little files on them (this
	# halves our space requirement by ~50% on /etc and /var on 8.x --
	# and gives us more back on 9.x as the default block and frag size
	# are 4 times larger).
	sed -i '' -e 's,-S -i 4096,-S -i 4096 -b 4096 -f 512,' \
		${NANO_WORLDDIR}/etc/rc.initdiskless
)
customize_cmd shrink_md_fbsize

customize_cmd cust_comconsole

dos_boot_part ( ) (
	local d=/usr/local/share/u-boot/${NANO_BOOT_PKG}
	local f=${NANO_FAT_DIR}

	# For now, just copy all the files. However, for iMX6 and Allwinner,
	# we'll need to put a special boot block at a fixed location
	# on the disk as well.
	rm -rf $f
	mkdir $f
	chdir $f
	cp ${d}/* .

	# Also copy ubldr. u-boot will load it and it will load the kernel
	# from the ufs partition
	cp ${NANO_WORLDDIR}/boot/ubldr .
	cp ${NANO_WORLDDIR}/boot/ubldr.bin .

	# We have to touch the saveenv file
	touch uEnv.txt

	# Now we need to copy over dtb files from the build.
	cp ${NANO_WORLDDIR}/boot/dtb/*.dtb .
)

if [ -n "$NANO_BOOT_PKG" ]; then
	if [ ! -d ${d} ]; then
		echo ${NANO_BOOT_PKG} not installed. Sadly, it must be.
		exit 1
	fi
	if [ ! -x /usr/local/bin/mcopy ]; then
		echo mtools not installed. Sadly, we gotta have it.
		exit 1
	fi
	customize_cmd dos_boot_part
fi

product_custom ( ) (
	# not quie ready to tweak these in nopriv build
	if [ -z ${NANO_NOPRIV_BUILD} ]; then
		# Last second tweaks -- generally not needed
		chown -R root:wheel ${NANO_WORLDDIR}/root
		chmod 0755 ${NANO_WORLDDIR}/root/*
		chmod 0755 ${NANO_WORLDDIR}/*
		chown -R root:wheel ${NANO_WORLDDIR}/etc
		chown -R root:wheel ${NANO_WORLDDIR}/boot
		chown root:wheel ${NANO_WORLDDIR}/
		chown root:wheel ${NANO_WORLDDIR}/usr
	fi
)
late_customize_cmd product_custom

#
# Convenience routines to bring up many settings for standard environments
#

#
# For each architecture, we have a standard set of settings to the extent
# it makes sense. For architectures that don't have a standard environment
# cfg files need to either define a lot of settings, provide their own disk
# imaging, or set which of the variants we support. No subshells, since we
# set global variables
#

std_aarch64 ( ) {
}

std_amd64 ( ) {
	std_i386
}

std_arm ( ) {
}

std_armeb ( ) {
	NANO_ENDIAN=big
}

std_armv6 ( ) {
}

std_i386 ( ) {
	# Default values, if not overridden in .cfg file
	: ${NANO_KERNEL:=GENERIC}
	: ${NANO_DRIVE:=ada0}
	: ${NANO_LAYOUT:=std-x86}
	: ${NANO_BOOT_MBR:=${NANO_WORLDDIR}/boot/boot0sio}
	: ${NANO_BOOT_BSD:=${NANO_WORLDDIR}/boot/boot}
}

std_mips ( ) {
	NANO_ENDIAN=big
}

std_mipsel ( ) {
}

std_mips64 ( ) {
	NANO_ENDIAN=big
}

std_mips64el ( ) {
}

std_powerpc ( ) {
	NANO_ENDIAN=big
}

std_powerpc64 ( ) {
	NANO_LAYOUT=powerpc64-ibm
	NANO_ENDIAN=big
}

std_sparc64 ( ) {
	NANO_ENDIAN=big
}

#
# QEMU settings for the standard environments
#
qemu_env ( ) {

	NANO_DISKIMAGE_FORMAT=qcow2
}

# other standard environments will go here

eval std_${NANO_ARCH}

# Slice 1: FAT for ROM loading bootstrap
# Slice 2: Config partition
# Slice 3: FreeBSD partition (sized exactly)
# Slice 4: FreeBSD partition (empty)
# on first boot, we resize slice 3 & 4 to be 1/2 of what's
# left over on the SD card after slice 1 and 2 are taken
# off the top. We also resize the 'a' partion on first boot
# to the size of the partition for the ping/pong upgrade.
# This feature needs support in the rc.d bootup script.
#
# Ideally, we'd not put BSD labels on the MBR disks.
# However, we can't boot off raw MBR disks. First,
# boot2 defaults to 'a' partition, and freaks out
# unless you tell it to use 'c'. But even if we
# hack that, then /boot/loader wants to load off
# of 'c' partition. If you fix that, then we'll
# try to mount root, but sanity checks prevent
# slices from working.
#

: ${NANO_ENDIAN:=little}	# make -V something to figure it out?
: ${NANO_LAYOUT:=std-embedded}
: ${NANO_MAKEFS_UFS:=makefs -t ffs -B ${NANO_ENDIAN}}
: ${NANO_DISK_SCHEME:=mbr}  	# No others really supported ATM (well, gpt)
case ${NANO_LAYOUT} in
std-embedded)
	NANO_SLICE_FAT=s1
	NANO_SLICE_CFG=s2
	NANO_SLICE_ROOT=s3
	NANO_SLICE_ALTROOT=s4
	;;
std-x86)
	NANO_SLICE_CFG=s1
	NANO_SLICE_ROOT=s2
	NANO_SLICE_ALTROOT=s3
	;;
powerpc64-ibm)
	NANO_SLICE_PPCBOOT=s1
	NANO_SLICE_CFG=s2
	NANO_SLICE_ROOT=s3
	NANO_SLICE_ALTROOT=s4
	;;
powerpc64-apple)
	echo Not yet
	exit 1
	;;
std-uefi)
	NANO_SLICE_UEFI=s1
	NANO_SLICE_CFG=s2
	NANO_SLICE_ROOT=s3
	NANO_SLICE_ALTROOT=s4
	;;
std-uefi-bios)
	NANO_DISK_SCHEME=gpt
	NANO_SLICE_UEFI=p1
	NANO_SLICE_BOOT=p2
	NANO_SLICE_CFG=p3
	NANO_SLICE_ROOT=p4
	NANO_SLICE_ALTROOT=p5
	# override root name
	NANO_ROOT=${NANO_SLICE_ROOT}
	NANO_ALTROOT=${NANO_SLICE_ALTROOT}
	;;
*)
	echo Unknown Layout ${NANO_LAYOUT}
	exit 1
	;;
esac


NANO_SLICE_DATA=		# Not included

# Each major disk scheme has its own routine. Generally
# this is for mbr, gpt, etc. These are generally are widely
# shared, but some specialized formats won't be shared.
create_diskimage ( ) (
	eval create_diskimage_${NANO_DISK_SCHEME}
)