#!/usr/bin/env bash

set -e

[[ "${EUID}" -eq 0 ]] || {
  echo "ERROR: Must be run as root (try sudo ncp-dist-upgrade)"
  exit 1
}

. /etc/os-release

if [[ "$VERSION_ID" -eq 10 ]]
then
  UPGRADE_CMD=(bash /usr/local/bin/ncp-dist-upgrade.d/debian-10.sh)
elif [[ "$VERSION_ID" -eq 11 ]]
then
  UPGRADE_CMD=(bash /usr/local/bin/ncp-dist-upgrade.d/debian-11.sh)
else
  echo "No dist-upgrade available for OS version: Debian ${VERSION}."
  exit 0
fi

if { [ "$TERM" = "screen" ] && [ -n "$TMUX" ]; } || [[ "${DEBIAN_FRONTEND:-}" == "noninteractive" ]] || ! [[ -t 0 ]]
then
  "${UPGRADE_CMD[@]}" |& tee /var/log/ncp-dist-upgrade.log
else
  tmux list-sessions | grep ncp-distupgrade && {
    echo "Existing distupgrade process detected. Connecting..."
    sleep 5
    tmux attach -t ncp-distupgrade
    exit 0
  }
  tmux new-session -s ncp-distupgrade bash -c "${UPGRADE_CMD[*]} |& tee /var/log/ncp-dist-upgrade.log; bash"
fi