#!/usr/bin/env bash
#
set -euo pipefail
IFS=$'\n\t'
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

: ${DOCKERDIR:="$DIR/docker"}

mkdir -p "$DOCKERDIR"

function cleanup {
    for dev in "${devices[@]}"; do
        echo "Deleting $dev"
        ifconfig "$dev" destroy
    done
}
devices=()
for sig in EXIT INT QUIT HUP TERM; do
  trap "set +e; cleanup" "$sig"
done

ifconfig tap1 create
devices+=("tap1")
ifconfig tap1 up
ifconfig bridge0 addm tap1

# 1 core
# 1GB ram
# -H yield the virtual CPU when HLT instruction is detected, otherwise bhyve eats the entire core
# -w Ignore accesses to unimplemented Model Specific Registers. Maybe not needed? Man page says its for debug purposes
# -l for lpc devices
# -U for specifying uuid, going to omit and see if the generated one works
# -u RTC is in UTC
# -s virtual PCI slots
# -P force guest CPU to exit when PAUSE instruction detected
set +e
bhyve \
    -c 1 \
    -m 1024M \
    -H \
    -w \
    -P \
    -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \
    -u \
    -s 0,hostbridge \
    -s 31,lpc \
    -s 4:0,virtio-blk,/vm/docker/disk0.img \
    -s 5:0,virtio-net,tap1,mac=58:9c:fc:09:c3:ba \
    -s 6:0,virtio-rnd \
    -s "7:0,virtio-9p,docker=$DOCKERDIR" \
    -l com1,stdio \
    docker
bhyve_status=$?
set -e

if [ "$bhyve_status" == "0" ]; then
    echo "rebooted"
elif [ "$bhyve_status" == "1" ]; then
    echo "powered off"
elif [ "$bhyve_status" == "2" ]; then
    echo "halted"
elif [ "$bhyve_status" == "3" ]; then
    echo "triple fault"
elif [ "$bhyve_status" == "4" ]; then
    echo "exited due to an error"
fi