#!/bin/sh

#  Copyright 2022 Anthony Perkins
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.

# Copy this script to $vmpath. The filename should be the VM name. To ease
# snapshotting, each VM should be in its own directory, and should be a separate
# ZFS dataset. For example:
#
#   /virt/vm/testvm                   <-- ZFS dataset.
#   /virt/vm/testvm/testvm            <-- This script.
#   /virt/vm/testvm/testvm_disk0.img  <-- Hard disk image.
#   /virt/vm/testvm/cdrom.iso         <-- Operating System install ISO.
#
# The VM will be named the same as this script filename, unless you change the
# vmname variable here.
vmname=$(basename $0)
vmpath=$(dirname $0)

# The VM will have one virtual CPU socket with this number of cores. Windows
# will only see up to two sockets, but up to 256 cores per socket. So cores are
# preferred.
cpucores=1

# RAM size in KiB (K), MiB (M), or GiB (G).
ram=1G

# VNC should be "localhost:5900", "127.0.0.1:5901", "[::1]:5902",
# "0.0.0.0:5903", "[::]:5904", or similar. Note that "0.0.0.0" and "[::]" will
# be accessible over the network. "localhost", "127.0.0.1", and "[::1]" will
# only be accessible from this host (or via SSH tunnels).
vnc="localhost:0"

# Network TAP device.
netif=tap0

# Change to /dev/nmdm0A for the first null-modem.
comoutput=stdio

# Comment the next line out for no CD-ROM.
cdrom="-s 3,ahci-cd,$vmpath/cdrom.iso"

################################################################################

# Check for firmware.
if ! [ -e /usr/local/share/uefi-firmware/BHYVE_UEFI.fd ]; then
        echo "Firmware not found. Try \`pkg install bhyve-firmware\`." >&2
        exit 1
fi

# Finally, run the bhyve command with all of these variables. Note that there
# are a few limitations with UEFI or Windows:
#
#   - ahci-* devices must be in slots 3, 4, 5, or 6.
#   - lpc must be in slot 31.
#   - Some Windows versions require a CD-ROM device to be present. This can be
#     an empty file, created with 'touch cdrom.iso'.
/usr/sbin/bhyve \
	-c sockets=1,cores=$cpucores,threads=1 \
	-m $ram \
	-w \
	-H \
	-s 0,hostbridge \
	-s 1,virtio-blk,$vmpath/${vmname}_disk0.img \
	-s 2,virtio-net,$netif \
	$cdrom \
	-s 29,fbuf,tcp=${vnc},w=800,h=600 \
	-s 30,xhci,tablet \
	-s 31,lpc \
	-l com1,$comoutput \
	-l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \
	$vmname