# -*- mode: sh; fill-column: 72; comment-column: 62; -*-

# OpenBSD 6.9 the last release which support tftp-server-name
# all another ine requires next-server which is IP address and
# leads to
VERSION="${VERSION-6.9}"

# Leaseweb is CDN based mirror which keep historical archive
MIRROR="${MIRROR-https://mirror.leaseweb.com/pub/OpenBSD}"

# Keep in mind that auto_upgrade won't work for
COMMAND="${COMMAND:-pxeboot}"

# Hardcode my host, but allow it to easy change
INSTALL_SERVER="${INSTALL_SERVER:-install.catap.net}"

# bypass 2222 to guest 22 by default
SSH_PORT="${SSH_PORT:-2222}"

BOOT_CMD="${BOOT_CMD:-tftp:/bsd.rd}"

set -e

if [ "$#" -eq 0 ]
then
  echo "You should add disk, like -hda /dev/blabla" 1>&2
  exit 1
fi

# well, it can be adjusted for another arch one day thus, I
# may not use host/ifconfig if HOSTNAME provided but check it
# here makes code cleaner and I can't image the rescue system
# without it
for cmd in qemu-system-x86_64 wget host ifconfig
do
  if ! command -v "${cmd}" >/dev/null
  then
    echo "command not found: ${cmd}" 1>&2
    exit 1
  fi
done

# here I may use rsync instead, but leaseweb's mirror has
# limit of connection and can't be used without loop
mkdir -p tftpboot
for file in bsd.rd pxeboot
do
  wget -q -O tftpboot/${file} ${MIRROR}/${VERSION}/amd64/${file}
done

for file in auto_install auto_upgrade
do
 rm -f tftpboot/${file} && ln -s pxeboot tftpboot/${file}
done

mkdir -p tftpboot/etc
cat > tftpboot/etc/boot.conf << EOF
stty com0 115200
set tty com0
boot ${BOOT_CMD}
EOF

if [ -z "${HOSTNAME}" ]; then
  HOSTNAME=$(host $(ifconfig eth0 | grep 'inet ' | awk '{print $2}') | awk '{print $5}')
fi

qemu-system-x86_64 \
    -m 1024 \
    -smp 2 \
    -device e1000,netdev=net0 \
    -nographic \
    -netdev user,id=net0,hostname=${HOSTNAME},tftp=tftpboot,bootfile=${COMMAND},tftp-server-name=${INSTALL_SERVER},hostfwd=tcp::${SSH_PORT}-:22 \
    -boot order=c,once=n \
    -serial mon:stdio \
    "$@"