#! /bin/sh

# Auto-install OpenBSD/amd64 6.6 to a QEMU guest machine.
#
# Inspired by:
#
# - https://man.openbsd.org/autoinstall
#
# - https://eradman.com/posts/autoinstall-openbsd.html
#
# - https://drewdevault.com/2018/09/10/Getting-started-with-qemu.html
#
# Remove generated files with
#
#   git clean -Xdf
#
# Copyright (c) 2020 Stefan Kreutz <mail@skreutz.com>

set -o errexit
set -o xtrace

# Download and verify OpenBSD/amd64 6.6 distribution.
#
# Note: rsync deletes superfluous files, e.g., the site66.tgz.
[ -e openbsd-66-base.pub ] || \
  curl --output openbsd-66-base.pub --silent \
    https://ftp.openbsd.org/pub/OpenBSD/6.6/openbsd-66-base.pub
mkdir -p http/pub/OpenBSD/6.6/amd64
rsync --recursive --delete --quiet \
  rsync://ftp.halifax.rwth-aachen.de/openbsd/6.6/amd64/ \
  http/pub/OpenBSD/6.6/amd64/
( cd http/pub/OpenBSD/6.6/amd64 && \
  signify -C -q -p ../../../../../openbsd-66-base.pub -x SHA256.sig )

# Add a site-specific file set to patch the system at the end of the
# installation -- and optionally on the first boot.
#
# Note: Afterwards, signify will fail to verify the integrity of the
# distribution.
tar -czf http/pub/OpenBSD/6.6/amd64/site66.tgz install.site
( cd http/pub/OpenBSD/6.6/amd64 && ls -l > index.txt )

# Add public ssh key to install.conf.
grep -q -e "^Public ssh key for user =" http/install.conf || {
  ssh_pub_key="$( cat ~/.ssh/id_rsa.pub )"
  echo "Public ssh key for user = ${ssh_pub_key}" >> http/install.conf
}

# TODO: Start HTTP server automatically in the background.
# sudo python3 -m http.server --directory http --bind 127.0.0.1 80

# Create copy-on-write disk image.
[ -e openbsd-66-vm.qcow2 ] || qemu-img create -f qcow2 openbsd-66-vm.qcow2 16G

# Auto-install guest machine.
#
# Connect with
#
#   ssh -o "StrictHostKeyChecking no" -o "UserKnownHostsFile /dev/null" -o "Port 2222" root@127.0.0.1
#
# Stop guest machine with C-a x
#
# Show help with C-a h
#
# network    = 10.0.2.0/24
# host       = 10.0.2.2
# nameserver = 10.0.2.3
# guest      = 10.0.2.15-31
qemu-system-x86_64 \
  -enable-kvm \
  -m 4G \
  -device e1000,netdev=n1 \
  -netdev user,id=n1,hostname=openbsd-vm,tftp=tftp,bootfile=auto_install,hostfwd=tcp::2222-:22 \
  -drive file=openbsd-66-vm.qcow2,media=disk,if=virtio \
  -nographic