#!/bin/sh
#
# © 2022 Johannes Schauer Marin Rodrigues <josch@mister-muffin.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# The software is provided "as is", without warranty of any kind, express or
# implied, including but not limited to the warranties of merchantability,
# fitness for a particular purpose and noninfringement. In no event shall the
# authors or copyright holders be liable for any claim, damages or other
# liability, whether in an action of contract, tort or otherwise, arising
# from, out of or in connection with the software or the use or other dealings
# in the software.

set -eu

# This script creates debian-unstable.qcow2 in the current directory which can
# then be used by the autopkgtest qemu backend.
#
# Thanks to Francesco Poli for providing ideas and testing this.
#
# Reasons why this is only working on amd64 and i386
#
#   - /usr/share/autopkgtest/setup-commands/setup-testbed only seems to be
#     written for those architectures
#   - extlinux is limited to amd64 and i386
#   - autopkgtest is unable to reach the testbed when we boot with grub
#
# To make this work with more architectures we need to:
#
#   - adjust GRUB_CMDLINE_LINUX_DEFAULT for architectures other than amd64 and
#     i386 in /usr/share/autopkgtest/setup-commands/setup-testbed
#   - make this work with grub2 instead of extlinux

case "$(dpkg --print-architecture)" in
	amd64) linux=linux-image-amd64 ;;
	i386) linux=linux-image-686 ;;
	*)
		echo "only supports amd64 and i386 for now" >&2
		exit 1
		;;
esac

mmdebstrap --variant=important --include=$linux \
  --customize-hook='chroot "$1" passwd --delete root' \
  --customize-hook='chroot "$1" useradd --home-dir /home/user --create-home user' \
  --customize-hook='chroot "$1" passwd --delete user' \
  --customize-hook='echo host > "$1/etc/hostname"' \
  --customize-hook='echo "127.0.0.1 localhost host" > "$1/etc/hosts"' \
  --customize-hook=/usr/share/autopkgtest/setup-commands/setup-testbed \
  unstable - | \
guestfish -- \
  disk-create debian-unstable.qcow2 qcow2 8G : \
  add-drive debian-unstable.qcow2 format:qcow2 : \
  launch : \
  part-disk /dev/sda mbr : \
  part-set-bootable /dev/sda 1 true : \
  mkfs ext4 /dev/sda1 : mount /dev/sda1 / : \
  tar-in - / xattrs:true : \
  upload /usr/lib/EXTLINUX/mbr.bin /boot/mbr.bin : \
  copy-file-to-device /boot/mbr.bin /dev/sda size:440 : \
  extlinux / : write "/extlinux.conf" "default linux
timeout 0

label linux
kernel /vmlinuz
append initrd=/initrd.img root=/dev/vda1 rw console=ttyS0" : \
  sync : umount / : shutdown