#!/bin/sh
#
# Copyright (c) 2013 NetApp, 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 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: release/10.0.0/share/examples/bhyve/vmrun.sh 257396 2013-10-30 20:42:09Z neel $
#

LOADER=/usr/sbin/bhyveload
BHYVECTL=/usr/sbin/bhyvectl
FBSDRUN=/usr/sbin/bhyve

DEFAULT_MEMSIZE=512M
DEFAULT_CPUS=2
DEFAULT_TAPDEV=tap0

DEFAULT_VIRTIO_DISK="./diskdev"
DEFAULT_ISOFILE="./release.iso"

usage() {
	echo "Usage: vmrun.sh [-hai][-g <gdbport>][-m <memsize>][-d <disk file>][-I <location of installation iso>][-t <tapdev>] <vmname>"
	echo "       -h: display this help message"
	echo "       -a: force memory mapped local apic access"
	echo "       -c: number of virtual cpus (default is ${DEFAULT_CPUS})"
	echo "       -d: virtio diskdev file (default is ${DEFAULT_VIRTIO_DISK})"
	echo "       -g: listen for connection from kgdb at <gdbport>"
	echo "       -i: force boot of the Installation CDROM image"
	echo "       -I: Installation CDROM image location (default is ${DEFAULT_ISOFILE})"
	echo "       -m: memory size (default is ${DEFAULT_MEMSIZE})"
	echo "       -t: tap device for virtio-net (default is $DEFAULT_TAPDEV)"
	echo ""
	echo "       This script needs to be executed with superuser privileges"
	echo ""
	exit 1
}

if [ `id -u` -ne 0 ]; then
	usage
fi

kldstat -n vmm > /dev/null 2>&1 
if [ $? -ne 0 ]; then
	echo "vmm.ko is not loaded!"
	exit 1
fi

force_install=0
isofile=${DEFAULT_ISOFILE}
memsize=${DEFAULT_MEMSIZE}
cpus=${DEFAULT_CPUS}
virtio_diskdev=${DEFAULT_VIRTIO_DISK}
tapdev=${DEFAULT_TAPDEV}
apic_opt=""
gdbport=0

while getopts haic:g:I:m:d:t: c ; do
	case $c in
	h)
		usage
		;;
	a)
		apic_opt="-a"
		;;
	d)
		virtio_diskdev=${OPTARG}
		;;
	g)	gdbport=${OPTARG}
		;;
	i)
		force_install=1
		;;
	I)
		isofile=${OPTARG}
		;;
	c)
		cpus=${OPTARG}
		;;
	m)
		memsize=${OPTARG}
		;;
	t)
		tapdev=${OPTARG}
		;;
	\?)
		usage
		;;
	esac
done

shift $((${OPTIND} - 1))

if [ $# -ne 1 ]; then
	usage
fi

vmname="$1"

# Create the virtio diskdev file if needed
if [ ! -f ${virtio_diskdev} ]; then
	echo "virtio disk device file \"${virtio_diskdev}\" does not exist."
	echo "Creating it ..."
	truncate -s 8G ${virtio_diskdev} > /dev/null
fi

if [ ! -r ${virtio_diskdev} ]; then
	echo "virtio disk device file \"${virtio_diskdev}\" is not readable"
	exit 1
fi

if [ ! -w ${virtio_diskdev} ]; then
	echo "virtio disk device file \"${virtio_diskdev}\" is not writable"
	exit 1
fi

echo "Launching virtual machine \"$vmname\" ..."

while [ 1 ]; do
	${BHYVECTL} --vm=${vmname} --destroy > /dev/null 2>&1

	file ${virtio_diskdev} | grep ": x86 boot sector" > /dev/null
	rc=$?
	if [ $rc -ne 0 ]; then
		file ${virtio_diskdev} | grep ": Unix Fast File sys" > /dev/null
		rc=$?
	fi
	if [ $rc -ne 0 ]; then
		need_install=1
	else
		need_install=0
	fi

	if [ $force_install -eq 1 -o $need_install -eq 1 ]; then
		if [ ! -r ${isofile} ]; then
			echo -n "Installation CDROM image \"${isofile}\" "
			echo    "is not readable"
			exit 1
		fi
		BOOTDISK=${isofile}
		installer_opt="-s 31:0,ahci-cd,${BOOTDISK}"
	else
		BOOTDISK=${virtio_diskdev}
		installer_opt=""
	fi

#	${LOADER} -m ${memsize} -d ${BOOTDISK} ${vmname}

	tmpdir=`mktemp -d /tmp/${vmname}.XXXXX`
	if [ $? -ne 0 ]; then
		break
	fi

	cat - <<EOF >${tmpdir}/device.map
(hd0) ${virtio_diskdev}
(cd0) ${isofile}
EOF

	if [ $force_install -eq 1 -o $need_install -eq 1 ]; then
		cat - <<EOF >${tmpdir}/grub.cfg
linux (cd0)/install/vmlinuz file=/cdrom/preseed/ubuntu-server.seed priority=low vga=788
initrd (cd0)/install/initrd.gz
boot
EOF
	else
		cat - <<EOF >${tmpdir}/grub.cfg
configfile (hd0,1)/boot/grub/grub.cfg
EOF
	fi

	/usr/local/sbin/grub-bhyve -M ${memsize} -d ${tmpdir} -m ${tmpdir}/device.map ${vmname}
	if [ $? -ne 0 ]; then
		break
	fi

	rm ${tmpdir}/grub.cfg ${tmpdir}/device.map
	rmdir ${tmpdir}

	${FBSDRUN} -c ${cpus} -m ${memsize} ${apic_opt} -AI -H -P	\
		-g ${gdbport}						\
		-s 0:0,hostbridge					\
		-s 1:0,lpc						\
		-s 2:0,virtio-net,${tapdev}				\
		-s 3:0,virtio-blk,${virtio_diskdev}			\
		-l com1,stdio						\
		${installer_opt}					\
		${vmname}
	if [ $? -ne 0 ]; then
		break
	fi
done

exit 99