install.sh

#!/usr/bin/env bash
# =============================================================================
# install.sh – Bootstrap script for Ubuntu 22.04 (ARM / x86_64)
# Installs: Docker, Docker Compose v2, and all project dependencies.
# =============================================================================
set -euo pipefail

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
NC='\033[0m' # No Colour

log()    { echo -e "${CYAN}[install]${NC} $*"; }
success(){ echo -e "${GREEN}[install]${NC} $*"; }
warn()   { echo -e "${YELLOW}[install]${NC} $*"; }
error()  { echo -e "${RED}[install]${NC} $*" >&2; }

# --------------------------------------------------------------------------
# Pre-flight checks
# --------------------------------------------------------------------------
if [[ "$EUID" -ne 0 ]]; then
  error "Please run this script as root or with sudo."
  exit 1
fi

if ! grep -qi "ubuntu" /etc/os-release 2>/dev/null; then
  warn "This script is designed for Ubuntu 22.04. Proceeding anyway – YMMV."
fi

log "Starting system bootstrap…"

# --------------------------------------------------------------------------
# System update & base dependencies
# --------------------------------------------------------------------------
log "Updating package lists…"
apt-get update -qq

log "Installing base dependencies…"
apt-get install -y --no-install-recommends \
    ca-certificates \
    curl \
    wget \
    gnupg \
    lsb-release \
    unzip \
    git \
    jq \
    cron \
    logrotate \
    make

systemctl enable --now cron

# --------------------------------------------------------------------------
# Docker Engine
# --------------------------------------------------------------------------
if command -v docker &>/dev/null; then
  warn "Docker is already installed ($(docker --version)). Skipping."
else
  log "Installing Docker Engine…"
  install -m 0755 -d /etc/apt/keyrings
  curl -fsSL https://download.docker.com/linux/ubuntu/gpg \
    | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
  chmod a+r /etc/apt/keyrings/docker.gpg

  echo \
    "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] \
    https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" \
    | tee /etc/apt/sources.list.d/docker.list > /dev/null

  apt-get update -qq
  apt-get install -y docker-ce docker-ce-cli containerd.io \
      docker-buildx-plugin docker-compose-plugin

  systemctl enable --now docker
  success "Docker installed: $(docker --version)"
fi

# --------------------------------------------------------------------------
# Add current (non-root) user to docker group
# --------------------------------------------------------------------------
REAL_USER="${SUDO_USER:-$USER}"
if [[ -n "${REAL_USER}" && "${REAL_USER}" != "root" ]]; then
  usermod -aG docker "${REAL_USER}"
  warn "User '${REAL_USER}' added to docker group. Log out and back in to apply."
fi

# --------------------------------------------------------------------------
# Java 17 (host-level, optional – server runs in Docker but useful for local tools)
# --------------------------------------------------------------------------
if command -v java &>/dev/null && java -version 2>&1 | grep -q "17"; then
  warn "Java 17 already installed. Skipping."
else
  log "Installing OpenJDK 17…"
  apt-get install -y --no-install-recommends openjdk-17-jdk-headless
  success "Java installed: $(java -version 2>&1 | head -1)"
fi

# --------------------------------------------------------------------------
# Project setup
# --------------------------------------------------------------------------
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

log "Creating required directories…"
mkdir -p "${SCRIPT_DIR}/server-files" "${SCRIPT_DIR}/backups"

if [[ ! -f "${SCRIPT_DIR}/.env" ]]; then
  log "Creating .env from .env.example…"
  cp "${SCRIPT_DIR}/.env.example" "${SCRIPT_DIR}/.env"
  warn "→ Edit .env to set your RCON_PASSWORD and other settings before starting."
else
  warn ".env already exists – skipping copy."
fi

if [[ -f "${SCRIPT_DIR}/.env" ]]; then
  # shellcheck disable=SC1090
  set -a
  source "${SCRIPT_DIR}/.env"
  set +a
fi

log "Setting executable permissions on scripts…"
chmod +x "${SCRIPT_DIR}"/scripts/*.sh

# --------------------------------------------------------------------------
# Cron job for daily backups
# --------------------------------------------------------------------------
BASH_BIN="$(command -v bash)"
BACKUP_CRON_SCHEDULE="${BACKUP_CRON:-0 3 * * *}"
BACKUP_CRON_FILE="/etc/cron.d/minecraft-server-backup"
cat > "${BACKUP_CRON_FILE}" <<EOF
SHELL=/bin/bash
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
${BACKUP_CRON_SCHEDULE} root "${BASH_BIN}" "${SCRIPT_DIR}/scripts/backup.sh" >> /var/log/mc-backup.log 2>&1
EOF
chmod 0644 "${BACKUP_CRON_FILE}"
success "Daily backup cron job installed in /etc/cron.d/minecraft-server-backup (${BACKUP_CRON_SCHEDULE})."

# --------------------------------------------------------------------------
# Log rotation
# --------------------------------------------------------------------------
cat > /etc/logrotate.d/minecraft-server <<'LOGROTATE'
/var/log/mc-backup.log {
    weekly
    rotate 4
    compress
    missingok
    notifempty
}
LOGROTATE
success "Log rotation configured."

# --------------------------------------------------------------------------
# Done
# --------------------------------------------------------------------------
echo ""
success "Bootstrap complete!"
echo -e "${CYAN}Next steps:${NC}"
echo "  1. Edit .env – set passwords and tune MEMORY, MAX_PLAYERS, etc."
echo "  2. (Optional) Place modpack server files in ./server-files/"
echo "  3. Run:  make start   (or: docker compose up -d)"
echo ""