#!/bin/sh
#
# $FreeBSD$
#
#
# Common functions for virtual machine image build scripts.
#

export PATH="/bin:/usr/bin:/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
trap "cleanup" INT QUIT TRAP ABRT TERM

write_partition_layout() {

	case "${TARGET}:${TARGET_ARCH}" in
		amd64:amd64 | i386:i386)
			mkimg -s gpt -b /boot/pmbr \
				-p freebsd-boot/bootfs:=/boot/gptboot \
				-p freebsd-swap/swapfs::1G \
				-p freebsd-ufs/rootfs:=${VMBASE} \
				-o ${VMIMAGE}
			;;
		powerpc:powerpc*)
			mkimg -s apm \
				-p freebsd-boot/bootfs:=/boot/boot1.hfs \
				-p freebsd-swap/swapfs::1G \
				-p freebsd-ufs/rootfs:=${VMBASE} \
				-o ${VMIMAGE}
			;;
		*)
			# ENOTSUPP
			return 1
			;;
	esac

	return 0
}

err() {
	printf "${@}\n"
	cleanup
	return 1
}

cleanup() {
	if [ ! -z "${mddev}" ]; then
		mdconfig -d -u ${mddev}
	fi
	umount ${DESTDIR}/dev
	umount ${DESTDIR}

	return 0
}

vm_create_base() {
	# Creates the UFS root filesystem for the virtual machine disk,
	# written to the formatted disk image with mkimg(1).

	mkdir -p ${DESTDIR}
	truncate -s ${VMSIZE} ${VMBASE}
	mddev=$(mdconfig -f ${VMBASE})
	newfs -j /dev/${mddev}
	mount /dev/${mddev} ${DESTDIR}

	return 0
}

vm_install_base() {
	# Installs the FreeBSD userland/kernel to the virtual machine disk.

	cd ${WORLDDIR} && \
		make DESTDIR=${DESTDIR} \
		installworld installkernel distribution || \
		err "\n\nCannot install the base system to ${DESTDIR}."

	echo '# Custom /etc/fstab for FreeBSD VM images' \
		> ${DESTDIR}/etc/fstab
	echo '/dev/gpt/rootfs   /       ufs     rw      1       1' \
		>> ${DESTDIR}/etc/fstab
	echo '/dev/gpt/swapfs  none    swap    sw      0       0' \
		>> ${DESTDIR}/etc/fstab

	mkdir -p ${DESTDIR}/dev
	mount -t devfs devfs ${DESTDIR}/dev
	chroot ${DESTDIR} /usr/bin/newaliases
	chroot ${DESTDIR} /etc/rc.d/ldconfig forcestart
	umount ${DESTDIR}/dev

	return 0
}

vm_extra_install_base() {
	# Prototype.  When overridden, runs extra post-installworld commands
	# as needed, based on the target virtual machine image or cloud
	# provider image target.

	return 0
}

vm_extra_enable_services() {
	if [ ! -z "${VM_RC_LIST}" ]; then
		for _rcvar in ${VM_RC_LIST}; do
			echo ${_rcvar}_enable="YES" >> ${DESTDIR}/etc/rc.conf
		done
	fi

	return 0
}

vm_extra_install_packages() {
	mkdir -p ${DESTDIR}/dev
	mount -t devfs devfs ${DESTDIR}/dev
	chroot ${DESTDIR} env ASSUME_ALWAYS_YES=yes \
		/usr/sbin/pkg bootstrap -y
	if [ ! -z "${VM_EXTRA_PACKAGES}" ]; then
		chroot ${DESTDIR} env ASSUME_ALWAYS_YES=yes \
			/usr/sbin/pkg install -y ${VM_EXTRA_PACKAGES}
	fi
	umount ${DESTDIR}/dev

	return 0
}

vm_extra_install_ports() {
	# Prototype.  When overridden, installs additional ports within the
	# virtual machine environment.

	return 0
}

vm_extra_pre_umount() {
	# Prototype.  When overridden, installs additional ports within the
	# virtual machine environment.

	return 0
}

vm_umount_base() {
	i=0
	sync
	while ! umount ${DESTDIR}/dev ${DESTDIR}; do
		i=$(( $i + 1 ))
		if [ $i -ge 10 ]; then
			# This should never happen.  But, it has happened.
			msg="Cannot umount(8) ${DESTDIR}\n"
			msg="${msg}Something has gone horribly wrong."
			err "${msg}"
		fi
		sleep 1
	done

	return 0
}

vm_create_disk() {
	echo "Creating image...  Please wait."
	echo

	write_partition_layout || return 1

	return 0
}

vm_extra_create_disk() {

	return 0
}