import-layers/yocto-poky/meta/classes/image-live.bbclass - stefanberger/openbmc - Gitiles

 # Copyright (C) 2004, Advanced Micro Devices, Inc.  All Rights Reserved
 # Released under the MIT license (see packages/COPYING)

 # Creates a bootable image using syslinux, your kernel and an optional
 # initrd

 #
 # End result is two things:
 #
 # 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
 # an initrd and a rootfs image. These can be written to harddisks directly and
 # also booted on USB flash disks (write them there with dd).
 #
 # 2. A CD .iso image

 # Boot process is that the initrd will boot and process which label was selected
 # in syslinux. Actions based on the label are then performed (e.g. installing to
 # an hdd)

 # External variables (also used by syslinux.bbclass)
 # ${INITRD} - indicates a list of filesystem images to concatenate and use as an initrd (optional)
 # ${COMPRESSISO} - Transparent compress ISO, reduce size ~40% if set to 1
 # ${NOISO}  - skip building the ISO image if set to 1
 # ${NOHDD}  - skip building the HDD image if set to 1
 # ${HDDIMG_ID} - FAT image volume-id
 # ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)

 inherit live-vm-common

 do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
                         mtools-native:do_populate_sysroot \
                         cdrtools-native:do_populate_sysroot \
                         virtual/kernel:do_deploy \
                         ${MLPREFIX}syslinux:do_populate_sysroot \
                         syslinux-native:do_populate_sysroot \
                         ${@oe.utils.ifelse(d.getVar('COMPRESSISO', False),'zisofs-tools-native:do_populate_sysroot','')} \
                         ${PN}:do_image_${@d.getVar('LIVE_ROOTFS_TYPE').replace('-', '_')} \
                         "


 LABELS_LIVE ?= "boot install"
 ROOT_LIVE ?= "root=/dev/ram0"
 INITRD_IMAGE_LIVE ?= "${MLPREFIX}core-image-minimal-initramfs"
 INITRD_LIVE ?= "${DEPLOY_DIR_IMAGE}/${INITRD_IMAGE_LIVE}-${MACHINE}.cpio.gz"

 LIVE_ROOTFS_TYPE ?= "ext4"
 ROOTFS ?= "${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.${LIVE_ROOTFS_TYPE}"

 IMAGE_TYPEDEP_live = "${LIVE_ROOTFS_TYPE}"
 IMAGE_TYPEDEP_iso = "${LIVE_ROOTFS_TYPE}"
 IMAGE_TYPEDEP_hddimg = "${LIVE_ROOTFS_TYPE}"
 IMAGE_TYPES_MASKED += "live hddimg iso"

 python() {
     image_b = d.getVar('IMAGE_BASENAME')
     initrd_i = d.getVar('INITRD_IMAGE_LIVE')
     if image_b == initrd_i:
         bb.error('INITRD_IMAGE_LIVE %s cannot use image live, hddimg or iso.' % initrd_i)
         bb.fatal('Check IMAGE_FSTYPES and INITRAMFS_FSTYPES settings.')
     elif initrd_i:
         d.appendVarFlag('do_bootimg', 'depends', ' %s:do_image_complete' % initrd_i)
 }

 HDDDIR = "${S}/hddimg"
 ISODIR = "${S}/iso"
 EFIIMGDIR = "${S}/efi_img"
 COMPACT_ISODIR = "${S}/iso.z"
 COMPRESSISO ?= "0"

 ISOLINUXDIR ?= "/isolinux"
 ISO_BOOTIMG = "isolinux/isolinux.bin"
 ISO_BOOTCAT = "isolinux/boot.cat"
 MKISOFS_OPTIONS = "-no-emul-boot -boot-load-size 4 -boot-info-table"

 BOOTIMG_VOLUME_ID   ?= "boot"
 BOOTIMG_EXTRA_SPACE ?= "512"

 populate_live() {
     populate_kernel $1
 	if [ -s "${ROOTFS}" ]; then
 		install -m 0644 ${ROOTFS} $1/rootfs.img
 	fi
 }

 build_iso() {
 	# Only create an ISO if we have an INITRD and NOISO was not set
 	if [ -z "${INITRD}" ] || [ "${NOISO}" = "1" ]; then
 		bbnote "ISO image will not be created."
 		return
 	fi
 	# ${INITRD} is a list of multiple filesystem images
 	for fs in ${INITRD}
 	do
 		if [ ! -s "$fs" ]; then
 			bbwarn "ISO image will not be created. $fs is invalid."
 			return
 		fi
 	done

 	populate_live ${ISODIR}

 	if [ "${PCBIOS}" = "1" ]; then
 		syslinux_iso_populate ${ISODIR}
 	fi
 	if [ "${EFI}" = "1" ]; then
 		efi_iso_populate ${ISODIR}
 		build_fat_img ${EFIIMGDIR} ${ISODIR}/efi.img
 	fi

 	# EFI only
 	if [ "${PCBIOS}" != "1" ] && [ "${EFI}" = "1" ] ; then
 		# Work around bug in isohybrid where it requires isolinux.bin
 		# In the boot catalog, even though it is not used
 		mkdir -p ${ISODIR}/${ISOLINUXDIR}
 		install -m 0644 ${STAGING_DATADIR}/syslinux/isolinux.bin ${ISODIR}${ISOLINUXDIR}
 	fi

 	if [ "${COMPRESSISO}" = "1" ] ; then
 		# create compact directory, compress iso
 		mkdir -p ${COMPACT_ISODIR}
 		mkzftree -z 9 -p 4 -F ${ISODIR}/rootfs.img ${COMPACT_ISODIR}/rootfs.img

 		# move compact iso to iso, then remove compact directory
 		mv ${COMPACT_ISODIR}/rootfs.img ${ISODIR}/rootfs.img
 		rm -Rf ${COMPACT_ISODIR}
 		mkisofs_compress_opts="-R -z -D -l"
 	else
 		mkisofs_compress_opts="-r"
 	fi

 	# Check the size of ${ISODIR}/rootfs.img, use mkisofs -iso-level 3
 	# when it exceeds 3.8GB, the specification is 4G - 1 bytes, we need
 	# leave a few space for other files.
 	mkisofs_iso_level=""

         if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
 		rootfs_img_size=`stat -c '%s' ${ISODIR}/rootfs.img`
 		# 4080218931 = 3.8 * 1024 * 1024 * 1024
 		if [ $rootfs_img_size -gt 4080218931 ]; then
 			bbnote "${ISODIR}/rootfs.img execeeds 3.8GB, using '-iso-level 3' for mkisofs"
 			mkisofs_iso_level="-iso-level 3"
 		fi
 	fi

 	if [ "${PCBIOS}" = "1" ] && [ "${EFI}" != "1" ] ; then
 		# PCBIOS only media
 		mkisofs -V ${BOOTIMG_VOLUME_ID} \
 		        -o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
 			-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
 			$mkisofs_compress_opts \
 			${MKISOFS_OPTIONS} $mkisofs_iso_level ${ISODIR}
 	else
 		# EFI only OR EFI+PCBIOS
 		mkisofs -A ${BOOTIMG_VOLUME_ID} -V ${BOOTIMG_VOLUME_ID} \
 		        -o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
 			-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
 			$mkisofs_compress_opts ${MKISOFS_OPTIONS} $mkisofs_iso_level \
 			-eltorito-alt-boot -eltorito-platform efi \
 			-b efi.img -no-emul-boot \
 			${ISODIR}
 		isohybrid_args="-u"
 	fi

 	isohybrid $isohybrid_args ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso
 }

 build_fat_img() {
 	FATSOURCEDIR=$1
 	FATIMG=$2

 	# Calculate the size required for the final image including the
 	# data and filesystem overhead.
 	# Sectors: 512 bytes
 	#  Blocks: 1024 bytes

 	# Determine the sector count just for the data
 	SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} | cut -f 1) \* 2)

 	# Account for the filesystem overhead. This includes directory
 	# entries in the clusters as well as the FAT itself.
 	# Assumptions:
 	#   FAT32 (12 or 16 may be selected by mkdosfs, but the extra
 	#   padding will be minimal on those smaller images and not
 	#   worth the logic here to caclulate the smaller FAT sizes)
 	#   < 16 entries per directory
 	#   8.3 filenames only

 	# 32 bytes per dir entry
 	DIR_BYTES=$(expr $(find ${FATSOURCEDIR} | tail -n +2 | wc -l) \* 32)
 	# 32 bytes for every end-of-directory dir entry
 	DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 32))
 	# 4 bytes per FAT entry per sector of data
 	FAT_BYTES=$(expr $SECTORS \* 4)
 	# 4 bytes per FAT entry per end-of-cluster list
 	FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d | tail -n +2 | wc -l) \* 4))

 	# Use a ceiling function to determine FS overhead in sectors
 	DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
 	# There are two FATs on the image
 	FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
 	SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))

 	# Determine the final size in blocks accounting for some padding
 	BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})

 	# mkdosfs will sometimes use FAT16 when it is not appropriate,
 	# resulting in a boot failure from SYSLINUX. Use FAT32 for
 	# images larger than 512MB, otherwise let mkdosfs decide.
 	if [ $(expr $BLOCKS / 1024) -gt 512 ]; then
 		FATSIZE="-F 32"
 	fi

 	# mkdosfs will fail if ${FATIMG} exists. Since we are creating an
 	# new image, it is safe to delete any previous image.
 	if [ -e ${FATIMG} ]; then
 		rm ${FATIMG}
 	fi

 	if [ -z "${HDDIMG_ID}" ]; then
 		mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
 			${BLOCKS}
 	else
 		mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
 		${BLOCKS} -i ${HDDIMG_ID}
 	fi

 	# Copy FATSOURCEDIR recursively into the image file directly
 	mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/
 }

 build_hddimg() {
 	# Create an HDD image
 	if [ "${NOHDD}" != "1" ] ; then
 		populate_live ${HDDDIR}

 		if [ "${PCBIOS}" = "1" ]; then
 			syslinux_hddimg_populate ${HDDDIR}
 		fi
 		if [ "${EFI}" = "1" ]; then
 			efi_hddimg_populate ${HDDDIR}
 		fi

 		# Check the size of ${HDDDIR}/rootfs.img, error out if it
 		# exceeds 4GB, it is the single file's max size of FAT fs.
 		if [ -f ${HDDDIR}/rootfs.img ]; then
 			rootfs_img_size=`stat -c '%s' ${HDDDIR}/rootfs.img`
 			max_size=`expr 4 \* 1024 \* 1024 \* 1024`
 			if [ $rootfs_img_size -gt $max_size ]; then
 				bberror "${HDDDIR}/rootfs.img execeeds 4GB,"
 				bberror "this doesn't work on FAT filesystem, you can try either of:"
 				bberror "1) Reduce the size of rootfs.img"
 				bbfatal "2) Use iso, vmdk or vdi to instead of hddimg\n"
 			fi
 		fi

 		build_fat_img ${HDDDIR} ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg

 		if [ "${PCBIOS}" = "1" ]; then
 			syslinux_hddimg_install
 		fi

 		chmod 644 ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg
 	fi
 }

 python do_bootimg() {
     set_live_vm_vars(d, 'LIVE')
     if d.getVar("PCBIOS") == "1":
         bb.build.exec_func('build_syslinux_cfg', d)
     if d.getVar("EFI") == "1":
         bb.build.exec_func('build_efi_cfg', d)
     bb.build.exec_func('build_hddimg', d)
     bb.build.exec_func('build_iso', d)
     bb.build.exec_func('create_symlinks', d)
 }
 do_bootimg[subimages] = "hddimg iso"
 do_bootimg[imgsuffix] = "."

 addtask bootimg before do_image_complete
	# Copyright (C) 2004, Advanced Micro Devices, Inc. All Rights Reserved
	# Released under the MIT license (see packages/COPYING)

	# Creates a bootable image using syslinux, your kernel and an optional
	# initrd

	#
	# End result is two things:
	#
	# 1. A .hddimg file which is an msdos filesystem containing syslinux, a kernel,
	# an initrd and a rootfs image. These can be written to harddisks directly and
	# also booted on USB flash disks (write them there with dd).
	#
	# 2. A CD .iso image

	# Boot process is that the initrd will boot and process which label was selected
	# in syslinux. Actions based on the label are then performed (e.g. installing to
	# an hdd)

	# External variables (also used by syslinux.bbclass)
	# ${INITRD} - indicates a list of filesystem images to concatenate and use as an initrd (optional)
	# ${COMPRESSISO} - Transparent compress ISO, reduce size ~40% if set to 1
	# ${NOISO} - skip building the ISO image if set to 1
	# ${NOHDD} - skip building the HDD image if set to 1
	# ${HDDIMG_ID} - FAT image volume-id
	# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)

	inherit live-vm-common

	do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
	mtools-native:do_populate_sysroot \
	cdrtools-native:do_populate_sysroot \
	virtual/kernel:do_deploy \
	${MLPREFIX}syslinux:do_populate_sysroot \
	syslinux-native:do_populate_sysroot \
	${@oe.utils.ifelse(d.getVar('COMPRESSISO', False),'zisofs-tools-native:do_populate_sysroot','')} \
	${PN}:do_image_${@d.getVar('LIVE_ROOTFS_TYPE').replace('-', '_')} \
	"


	LABELS_LIVE ?= "boot install"
	ROOT_LIVE ?= "root=/dev/ram0"
	INITRD_IMAGE_LIVE ?= "${MLPREFIX}core-image-minimal-initramfs"
	INITRD_LIVE ?= "${DEPLOY_DIR_IMAGE}/${INITRD_IMAGE_LIVE}-${MACHINE}.cpio.gz"

	LIVE_ROOTFS_TYPE ?= "ext4"
	ROOTFS ?= "${IMGDEPLOYDIR}/${IMAGE_LINK_NAME}.${LIVE_ROOTFS_TYPE}"

	IMAGE_TYPEDEP_live = "${LIVE_ROOTFS_TYPE}"
	IMAGE_TYPEDEP_iso = "${LIVE_ROOTFS_TYPE}"
	IMAGE_TYPEDEP_hddimg = "${LIVE_ROOTFS_TYPE}"
	IMAGE_TYPES_MASKED += "live hddimg iso"

	python() {
	image_b = d.getVar('IMAGE_BASENAME')
	initrd_i = d.getVar('INITRD_IMAGE_LIVE')
	if image_b == initrd_i:
	bb.error('INITRD_IMAGE_LIVE %s cannot use image live, hddimg or iso.' % initrd_i)
	bb.fatal('Check IMAGE_FSTYPES and INITRAMFS_FSTYPES settings.')
	elif initrd_i:
	d.appendVarFlag('do_bootimg', 'depends', ' %s:do_image_complete' % initrd_i)
	}

	HDDDIR = "${S}/hddimg"
	ISODIR = "${S}/iso"
	EFIIMGDIR = "${S}/efi_img"
	COMPACT_ISODIR = "${S}/iso.z"
	COMPRESSISO ?= "0"

	ISOLINUXDIR ?= "/isolinux"
	ISO_BOOTIMG = "isolinux/isolinux.bin"
	ISO_BOOTCAT = "isolinux/boot.cat"
	MKISOFS_OPTIONS = "-no-emul-boot -boot-load-size 4 -boot-info-table"

	BOOTIMG_VOLUME_ID ?= "boot"
	BOOTIMG_EXTRA_SPACE ?= "512"

	populate_live() {
	populate_kernel $1
	if [ -s "${ROOTFS}" ]; then
	install -m 0644 ${ROOTFS} $1/rootfs.img
	fi
	}

	build_iso() {
	# Only create an ISO if we have an INITRD and NOISO was not set
	if [ -z "${INITRD}" ] \|\| [ "${NOISO}" = "1" ]; then
	bbnote "ISO image will not be created."
	return
	fi
	# ${INITRD} is a list of multiple filesystem images
	for fs in ${INITRD}
	do
	if [ ! -s "$fs" ]; then
	bbwarn "ISO image will not be created. $fs is invalid."
	return
	fi
	done

	populate_live ${ISODIR}

	if [ "${PCBIOS}" = "1" ]; then
	syslinux_iso_populate ${ISODIR}
	fi
	if [ "${EFI}" = "1" ]; then
	efi_iso_populate ${ISODIR}
	build_fat_img ${EFIIMGDIR} ${ISODIR}/efi.img
	fi

	# EFI only
	if [ "${PCBIOS}" != "1" ] && [ "${EFI}" = "1" ] ; then
	# Work around bug in isohybrid where it requires isolinux.bin
	# In the boot catalog, even though it is not used
	mkdir -p ${ISODIR}/${ISOLINUXDIR}
	install -m 0644 ${STAGING_DATADIR}/syslinux/isolinux.bin ${ISODIR}${ISOLINUXDIR}
	fi

	if [ "${COMPRESSISO}" = "1" ] ; then
	# create compact directory, compress iso
	mkdir -p ${COMPACT_ISODIR}
	mkzftree -z 9 -p 4 -F ${ISODIR}/rootfs.img ${COMPACT_ISODIR}/rootfs.img

	# move compact iso to iso, then remove compact directory
	mv ${COMPACT_ISODIR}/rootfs.img ${ISODIR}/rootfs.img
	rm -Rf ${COMPACT_ISODIR}
	mkisofs_compress_opts="-R -z -D -l"
	else
	mkisofs_compress_opts="-r"
	fi

	# Check the size of ${ISODIR}/rootfs.img, use mkisofs -iso-level 3
	# when it exceeds 3.8GB, the specification is 4G - 1 bytes, we need
	# leave a few space for other files.
	mkisofs_iso_level=""

	if [ -n "${ROOTFS}" ] && [ -s "${ROOTFS}" ]; then
	rootfs_img_size=`stat -c '%s' ${ISODIR}/rootfs.img`
	# 4080218931 = 3.8 * 1024 * 1024 * 1024
	if [ $rootfs_img_size -gt 4080218931 ]; then
	bbnote "${ISODIR}/rootfs.img execeeds 3.8GB, using '-iso-level 3' for mkisofs"
	mkisofs_iso_level="-iso-level 3"
	fi
	fi

	if [ "${PCBIOS}" = "1" ] && [ "${EFI}" != "1" ] ; then
	# PCBIOS only media
	mkisofs -V ${BOOTIMG_VOLUME_ID} \
	-o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
	-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
	$mkisofs_compress_opts \
	${MKISOFS_OPTIONS} $mkisofs_iso_level ${ISODIR}
	else
	# EFI only OR EFI+PCBIOS
	mkisofs -A ${BOOTIMG_VOLUME_ID} -V ${BOOTIMG_VOLUME_ID} \
	-o ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso \
	-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} \
	$mkisofs_compress_opts ${MKISOFS_OPTIONS} $mkisofs_iso_level \
	-eltorito-alt-boot -eltorito-platform efi \
	-b efi.img -no-emul-boot \
	${ISODIR}
	isohybrid_args="-u"
	fi

	isohybrid $isohybrid_args ${IMGDEPLOYDIR}/${IMAGE_NAME}.iso
	}

	build_fat_img() {
	FATSOURCEDIR=$1
	FATIMG=$2

	# Calculate the size required for the final image including the
	# data and filesystem overhead.
	# Sectors: 512 bytes
	# Blocks: 1024 bytes

	# Determine the sector count just for the data
	SECTORS=$(expr $(du --apparent-size -ks ${FATSOURCEDIR} \| cut -f 1) \* 2)

	# Account for the filesystem overhead. This includes directory
	# entries in the clusters as well as the FAT itself.
	# Assumptions:
	# FAT32 (12 or 16 may be selected by mkdosfs, but the extra
	# padding will be minimal on those smaller images and not
	# worth the logic here to caclulate the smaller FAT sizes)
	# < 16 entries per directory
	# 8.3 filenames only

	# 32 bytes per dir entry
	DIR_BYTES=$(expr $(find ${FATSOURCEDIR} \| tail -n +2 \| wc -l) \* 32)
	# 32 bytes for every end-of-directory dir entry
	DIR_BYTES=$(expr $DIR_BYTES + $(expr $(find ${FATSOURCEDIR} -type d \| tail -n +2 \| wc -l) \* 32))
	# 4 bytes per FAT entry per sector of data
	FAT_BYTES=$(expr $SECTORS \* 4)
	# 4 bytes per FAT entry per end-of-cluster list
	FAT_BYTES=$(expr $FAT_BYTES + $(expr $(find ${FATSOURCEDIR} -type d \| tail -n +2 \| wc -l) \* 4))

	# Use a ceiling function to determine FS overhead in sectors
	DIR_SECTORS=$(expr $(expr $DIR_BYTES + 511) / 512)
	# There are two FATs on the image
	FAT_SECTORS=$(expr $(expr $(expr $FAT_BYTES + 511) / 512) \* 2)
	SECTORS=$(expr $SECTORS + $(expr $DIR_SECTORS + $FAT_SECTORS))

	# Determine the final size in blocks accounting for some padding
	BLOCKS=$(expr $(expr $SECTORS / 2) + ${BOOTIMG_EXTRA_SPACE})

	# mkdosfs will sometimes use FAT16 when it is not appropriate,
	# resulting in a boot failure from SYSLINUX. Use FAT32 for
	# images larger than 512MB, otherwise let mkdosfs decide.
	if [ $(expr $BLOCKS / 1024) -gt 512 ]; then
	FATSIZE="-F 32"
	fi

	# mkdosfs will fail if ${FATIMG} exists. Since we are creating an
	# new image, it is safe to delete any previous image.
	if [ -e ${FATIMG} ]; then
	rm ${FATIMG}
	fi

	if [ -z "${HDDIMG_ID}" ]; then
	mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
	${BLOCKS}
	else
	mkdosfs ${FATSIZE} -n ${BOOTIMG_VOLUME_ID} ${MKDOSFS_EXTRAOPTS} -C ${FATIMG} \
	${BLOCKS} -i ${HDDIMG_ID}
	fi

	# Copy FATSOURCEDIR recursively into the image file directly
	mcopy -i ${FATIMG} -s ${FATSOURCEDIR}/* ::/
	}

	build_hddimg() {
	# Create an HDD image
	if [ "${NOHDD}" != "1" ] ; then
	populate_live ${HDDDIR}

	if [ "${PCBIOS}" = "1" ]; then
	syslinux_hddimg_populate ${HDDDIR}
	fi
	if [ "${EFI}" = "1" ]; then
	efi_hddimg_populate ${HDDDIR}
	fi

	# Check the size of ${HDDDIR}/rootfs.img, error out if it
	# exceeds 4GB, it is the single file's max size of FAT fs.
	if [ -f ${HDDDIR}/rootfs.img ]; then
	rootfs_img_size=`stat -c '%s' ${HDDDIR}/rootfs.img`
	max_size=`expr 4 \* 1024 \* 1024 \* 1024`
	if [ $rootfs_img_size -gt $max_size ]; then
	bberror "${HDDDIR}/rootfs.img execeeds 4GB,"
	bberror "this doesn't work on FAT filesystem, you can try either of:"
	bberror "1) Reduce the size of rootfs.img"
	bbfatal "2) Use iso, vmdk or vdi to instead of hddimg\n"
	fi
	fi

	build_fat_img ${HDDDIR} ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg

	if [ "${PCBIOS}" = "1" ]; then
	syslinux_hddimg_install
	fi

	chmod 644 ${IMGDEPLOYDIR}/${IMAGE_NAME}.hddimg
	fi
	}

	python do_bootimg() {
	set_live_vm_vars(d, 'LIVE')
	if d.getVar("PCBIOS") == "1":
	bb.build.exec_func('build_syslinux_cfg', d)
	if d.getVar("EFI") == "1":
	bb.build.exec_func('build_efi_cfg', d)
	bb.build.exec_func('build_hddimg', d)
	bb.build.exec_func('build_iso', d)
	bb.build.exec_func('create_symlinks', d)
	}
	do_bootimg[subimages] = "hddimg iso"
	do_bootimg[imgsuffix] = "."

	addtask bootimg before do_image_complete