# 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 filesystem image to use as an initrd (optional)
# ${NOISO}  - skip building the ISO image if set to 1
# ${ROOTFS} - indicates a filesystem image to include as the root filesystem (optional)

do_bootimg[depends] += "dosfstools-native:do_populate_sysroot \
                        mtools-native:do_populate_sysroot \
                        cdrtools-native:do_populate_sysroot"

PACKAGES = " "
EXCLUDE_FROM_WORLD = "1"

HDDDIR = "${S}/hdd/boot"
ISODIR = "${S}/cd"

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

inherit syslinux

build_iso() {
	# Only create an ISO if we have an INITRD and NOISO was not set
	if [ -z "${INITRD}" ] || [ ! -s "${INITRD}" ] || [ "${NOISO}" = "1" ]; then
		bbnote "ISO image will not be created."
		return
	fi

	install -d ${ISODIR}

	syslinux_iso_populate

	mkisofs -V ${BOOTIMG_VOLUME_ID} \
	        -o ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.iso \
		-b ${ISO_BOOTIMG} -c ${ISO_BOOTCAT} -r \
		${MKISOFS_OPTIONS} ${ISODIR}

	cd ${DEPLOY_DIR_IMAGE}
	rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
	ln -s ${IMAGE_NAME}.iso ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.iso
}

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

		# Determine the block count for the final image
		BLOCKS=`du -bks ${HDDDIR} | cut -f 1`
		SIZE=`expr $BLOCKS + ${BOOTIMG_EXTRA_SPACE}`

		mkdosfs -n ${BOOTIMG_VOLUME_ID} -d ${HDDDIR} \
		        -C ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg $SIZE

		syslinux_hddimg_install

		chmod 644 ${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.hddimg

		cd ${DEPLOY_DIR_IMAGE}
		rm -f ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
		ln -s ${IMAGE_NAME}.hddimg ${DEPLOY_DIR_IMAGE}/${IMAGE_LINK_NAME}.hddimg
	fi
}

python do_bootimg() {
	bb.build.exec_func('build_syslinux_cfg', d)
	bb.build.exec_func('build_hddimg', d)
	bb.build.exec_func('build_iso', d)
}

addtask bootimg before do_build
do_bootimg[nostamp] = "1"