quiz-root

#!/usr/bin/env bash
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# Copyright (c) 2023-2025, Rob Norris <robn@despairlabs.com>

set -uo pipefail

usage() {
  cat <<EOF
create a minimal root filesystem for the quiz microvm
usage: quiz-root
  -a <arch>
        architecture to create root for
EOF
  exit 1
}

trace() {
  local STAMP=$(date +%Y%m%d-%H:%M:%S)
  echo "[quiz-root] $STAMP $@" >&2
}

fail() {
  local TEXT=${@:-}
  if [[ -z $TEXT ]] ; then
    TEXT="[${BASH_SOURCE[0]}:${BASH_LINENO[0]}: $BASH_COMMAND]"
  fi
  trace "FATAL $TEXT"
  exit 1
}
trap fail ERR

RUNDIR=$(realpath $(dirname $0))
source $RUNDIR/quiz-config
source $RUNDIR/quiz-lib

opt_arch=""

OPTIND=1
while getopts "a:h" opt
do
  case "$opt" in
    'a') opt_arch=$OPTARG ;;
    'h') usage ;;
    *) exit 1 ;;
  esac
done
shift $(expr $OPTIND - 1)

quiz_arch_vars ${opt_arch:-$QUIZ_ARCH}
quiz_debian_vars

trace "building root image"

# XXX this lists should be source from somewhere else -- robn, 2025-01-10
quiz_extras=tini,udev,coreutils,procps,kmod,gdisk,dmsetup,tmux,cryptsetup
zfs_extras=libtirpc3,libjemalloc2,libasan8
zfstest_extras=ksh,bc,bzip2,cpio,file,acl,sysstat,samba-common-bin,openssl,pamtester,pax,iputils-ping,python3-minimal,rsync,openssh-client,binutils,attr,nfs-kernel-server,lsscsi,parted,linux-base,sudo,xxhash
debug_extras=jq,gdb,strace,bpftrace,linux-perf,xxd,blktrace,mdadm

# XXX add things back in the can't be in the default lists because they're
#     not installable from debian unstable right now. this is all a mess, as
#     you see -- robn, 2025-01-10
if [[ $_quiz_debian_arch == "amd64" ]] ; then
  zfstest_extras="$zfstest_extras,fio"
fi

image_basefile=$_quiz_debian_release.$_quiz_debian_arch

mmdebstrap \
  --arch=$_quiz_debian_arch \
  --variant=minbase \
  --include=$quiz_extras,$zfs_extras,$zfstest_extras,$debug_extras \
    --customize-hook='install -m 755 init/init1 "$1"/sbin/init' \
    --customize-hook='mkdir "$1"/mnt/quiz-init' \
    --customize-hook='mkdir "$1"/mnt/quiz-user' \
    --customize-hook='mkdir "$1"/mnt/quiz-kernel' \
    --customize-hook='mkdir "$1"/mnt/quiz-system' \
    --customize-hook='mkdir "$1"/mnt/lower "$1"/mnt/top "$1"/mnt/newroot' \
  $_quiz_debian_release $RUNDIR/system/$image_basefile.new.ext2 "$_quiz_debian_mirror"
mv -vf $RUNDIR/system/$image_basefile.new.ext2 $RUNDIR/system/$image_basefile.ext2

trace "done"

# vim: ft=bash