#!/bin/bash

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root"
   exit 1
fi

for CTID in $(pct list | tail -n+2 | awk '{print $1}'); do
  echo "==> Checking container $CTID..."

  if pct exec $CTID -- which apt >/dev/null 2>&1; then
    echo "-> apt found. Running update & upgrade..."
    pct exec $CTID -- apt -qq update
    pct exec $CTID -- apt -qq upgrade -y
  elif pct exec $CTID -- which apt-get >/dev/null 2>&1; then
    echo "-> apt-get found. Running update & upgrade..."
    pct exec $CTID -- apt-get -qq update
    pct exec $CTID -- apt-get -qq upgrade -y
  elif pct exec $CTID -- which dnf >/dev/null 2>&1; then
    echo "-> dnf found. Running update..."
    pct exec $CTID -- dnf -y upgrade --refresh
  elif pct exec $CTID -- which yum >/dev/null 2>&1; then
    echo "-> yum found. Running update..."
    pct exec $CTID -- yum -y update
  else
    echo "-> No package manager found in container $CTID – skipping."
  fi

  echo
done