#!/bin/bash

set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

[[ $EUID == 0 ]] || exec sudo -E "${BASH_SOURCE[0]}" "$@"

# used to have more than one, leaving commented in case we do
#for n in bullseye; do
n=bullseye
if [[ -e /etc/schroot/chroot.d/$n.conf ]]; then
  cd /
  schroot -c $n -- apt-get -y update
  schroot -c $n -- apt-get -y dist-upgrade --purge --auto-remove
fi
#done

# if we haven't upgraded yet
if [[ ! -d /mnt/boot/debianbullseye_bootstrap ]]; then
  exit 0
fi

dev=$(awk '$2 == "/mnt/boot" {print $1}' /etc/mtab)
if [[ ! $dev ]]; then
  exit 0
fi
mkdir -p /mnt/tmptimer
if ! mountpoint /mnt/tmptimer &>/dev/null; then
  mount -o subvol=debianbullseye_bootstrap $dev /mnt/tmptimer
fi
cd /mnt/tmptimer
for d in dev proc sys dev/pts; do
  [[ -d $d ]]
  if ! mountpoint $d &>/dev/null; then
    mount -o bind /$d $d
  fi
done
chroot . apt-get -y update
chroot . apt-get -y dist-upgrade --purge --auto-remove

for d in dev/pts dev proc sys; do
  if mountpoint $d &>/dev/null; then
    umount $d
  fi
done
cd /
umount /mnt/tmptimer