#!/usr/bin/env bash

if [ "$EUID" -ne 0 ]; then
  echo "Please run this script as root"
  exit
fi

# Change Buster release-info to oldstable
apt update --allow-releaseinfo-change

# Latest Buster updates
apt update
apt full-upgrade
# Do NOT use rpi-update !! It installs dev-kernel. Use rpi-eeprom-update instead.

# Switch to Bullseye...
sed -i 's/buster/bullseye/g' /etc/apt/sources.list
sed -i 's/buster/bullseye/g' /etc/apt/sources.list.d/*

# In my case, /var was owned by unknown user, which causes systemd upgrade issues
chown root:root /var

# Action!
apt update
# Prerequisite packages
apt install libgcc-8-dev gcc-8-base
apt full-upgrade
apt -f install
dpkg --configure --pending
apt full-upgrade 

# Remove obsolete packages
apt autoremove

# It seems the updater does not update the dhcpcd systemd unit file properly sometimes
sed -i 's/ExecStart=\/usr\/lib\/dhcpcd5\/dhcpcd/ExecStart=\/sbin\/dhcpcd/' /etc/systemd/system/dhcpcd5.service
systemctl daemon-reload

# Upgrade to Nodejs 14.x:

curl -fsSL https://deb.nodesource.com/setup_14.x | sudo -E bash -
apt install nodejs -y

# Update RPI Firmware (Pi4, only. has some risk. Be warned)
rpi-eeprom-update -d -a