Proxmox Container Update Script

#!/bin/bash
# update all containers with colored output

# Define colors
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[0;33m'
RED='\033[0;31m'
NC='\033[0m' # No Color

# list of container ids
containers=$(pct list | tail -n +2 | cut -f1 -d' ')

function update_container() {
  container=$1
  echo -e "${BLUE}[Info] Updating container $container${NC}"
  # to chain commands within one exec we will need to wrap them in bash
  pct exec $container -- bash -c "apt update && apt full-upgrade -y && apt autoremove --purge>
  if [ $? -eq 0 ]; then
    echo -e "${GREEN}[Success] Container $container updated successfully${NC}"
  else
    echo -e "${RED}[Error] Failed to update container $container${NC}"
  fi
}

for container in $containers
do
  status=`pct status $container`
  if [ "$status" == "status: stopped" ]; then
    echo -e "${YELLOW}[Info] Starting container $container${NC}"
    pct start $container
    if [ $? -ne 0 ]; then
      echo -e "${RED}[Error] Failed to start container $container, skipping${NC}"
      continue
    fi
    echo -e "${YELLOW}[Info] Sleeping 5 seconds to allow container to initialize${NC}"
    sleep 5
    update_container $container
    echo -e "${YELLOW}[Info] Shutting down container $container${NC}"
    pct shutdown $container &
  elif [ "$status" == "status: running" ]; then
    update_container $container
  else
    echo -e "${RED}[Warning] Container $container is in an unknown state: $status${NC}"
  fi
done
wait

echo -e "${GREEN}[Complete] All container updates finished${NC}"