uninstall-java-mysql-nginx-certbot.sh

gistfile1.txt

#!/usr/bin/env bash

set -euo pipefail

export LANG=C.UTF-8
export LC_ALL=C.UTF-8

usage() {
  cat <<'EOF'
Usage:
  sudo bash uninstall-java-mysql-nginx-certbot.sh

What this script does:
  - Stops MySQL and Nginx services if they exist
  - Removes Java packages, MySQL, Nginx, Certbot, python3-certbot-nginx
  - Runs apt autoremove and autoclean
  - Removes common leftover configuration directories

Warning:
  - This may permanently delete MySQL data and configuration on this server.
  - Intended for Ubuntu/Debian systems using apt-get.
EOF
}

if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
  usage
  exit 0
fi

if [[ "${EUID}" -ne 0 ]]; then
  echo "Please run this script as root or with sudo."
  exit 1
fi

log() {
  printf '\n[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$1"
}

require_command() {
  if ! command -v "$1" >/dev/null 2>&1; then
    echo "Missing required command: $1"
    exit 1
  fi
}

stop_service_if_exists() {
  local service_name="$1"

  if systemctl list-unit-files "${service_name}.service" >/dev/null 2>&1; then
    log "Stopping and disabling ${service_name}"
    systemctl stop "${service_name}" || true
    systemctl disable "${service_name}" || true
  fi
}

collect_installed_packages() {
  local package_names=("$@")
  local installed_packages=()
  local package=""

  for package in "${package_names[@]}"; do
    if dpkg -s "${package}" >/dev/null 2>&1; then
      installed_packages+=("${package}")
    fi
  done

  printf '%s\n' "${installed_packages[@]}"
}

collect_installed_java_packages() {
  dpkg-query -W -f='${binary:Package}\n' 2>/dev/null | grep -E '^(openjdk-[0-9]+|openjdk|default-jre|default-jdk|oracle-java[0-9]+|temurin-[0-9]+|temurin-[0-9]+-jdk|temurin-[0-9]+-jre|corretto-[0-9]+|corretto-[0-9]+-jdk|corretto-[0-9]+-jre)'
}

purge_packages() {
  local packages=(
    mysql-server
    mysql-client
    mysql-common
    nginx
    nginx-common
    certbot
    python3-certbot-nginx
  )
  local installed_packages=()
  local java_packages=()
  local package=""

  while IFS= read -r package; do
    [[ -n "${package}" ]] && java_packages+=("${package}")
  done < <(collect_installed_java_packages || true)

  while IFS= read -r package; do
    [[ -n "${package}" ]] && installed_packages+=("${package}")
  done < <(collect_installed_packages "${packages[@]}")

  if [[ ${#java_packages[@]} -gt 0 ]]; then
    installed_packages+=("${java_packages[@]}")
  fi

  if [[ ${#installed_packages[@]} -eq 0 ]]; then
    log "No target packages are currently installed"
    return 0
  fi

  log "Purging packages: ${installed_packages[*]}"
  DEBIAN_FRONTEND=noninteractive apt-get purge -y "${installed_packages[@]}"
}

remove_leftovers() {
  local paths=(
    /usr/lib/jvm
    /etc/mysql
    /var/lib/mysql
    /var/log/mysql
    /etc/nginx
    /var/log/nginx
    /var/www/html
    /etc/letsencrypt
    /var/lib/letsencrypt
    /var/log/letsencrypt
    /etc/profile.d/ezyplatform-java.sh
  )

  for path in "${paths[@]}"; do
    if [[ -e "${path}" ]]; then
      log "Removing ${path}"
      rm -rf "${path}"
    fi
  done
}

cleanup_packages() {
  log "Running apt autoremove"
  DEBIAN_FRONTEND=noninteractive apt-get autoremove -y

  log "Running apt autoclean"
  apt-get autoclean -y
}

print_summary() {
  cat <<'EOF'

Uninstall completed.

Removed targets:
  - Installed Java packages detected by dpkg
  - MySQL packages and common data/config directories
  - Nginx packages and common config/log directories
  - Certbot packages and common certificate directories

Please review the server if you want to remove any custom files outside the standard paths.
EOF
}

require_command apt-get
require_command systemctl
require_command dpkg

log "Updating apt package index"
apt-get update

stop_service_if_exists mysql
stop_service_if_exists nginx

purge_packages
cleanup_packages
remove_leftovers

print_summary