feat(installer): add prerequisite checks and auto-detection

installer/install.sh

@@ -287,3 +287,91 @@ load_env_overrides() {
   [ -z "$DOCKER_SOCKET" ] && DOCKER_SOCKET="$_ENV_DOCKER_SOCKET"
   [ -z "$NODE_TLS_REJECT" ] && NODE_TLS_REJECT="$_ENV_NODE_TLS_REJECT"
 }
+
+# --- Prerequisites ---
+
+check_prerequisites() {
+  log_info "Checking prerequisites..."
+  local errors=0
+
+  if ! command -v docker >/dev/null 2>&1; then
+    log_error "Docker is not installed."
+    echo "  Install Docker Engine: https://docs.docker.com/engine/install/"
+    errors=$((errors + 1))
+  else
+    local docker_version
+    docker_version=$(docker version --format '{{.Server.Version}}' 2>/dev/null || echo "unknown")
+    log_info "Docker version: $docker_version"
+  fi
+
+  if ! docker compose version >/dev/null 2>&1; then
+    log_error "Docker Compose v2 is not available."
+    echo "  'docker compose' subcommand required (not standalone docker-compose)."
+    errors=$((errors + 1))
+  else
+    local compose_version
+    compose_version=$(docker compose version --short 2>/dev/null || echo "unknown")
+    log_info "Docker Compose version: $compose_version"
+  fi
+
+  if ! command -v openssl >/dev/null 2>&1; then
+    log_error "OpenSSL is not installed (needed for password generation)."
+    errors=$((errors + 1))
+  fi
+
+  local socket="${DOCKER_SOCKET:-$DEFAULT_DOCKER_SOCKET}"
+  if [ ! -S "$socket" ]; then
+    log_warn "Docker socket not found at $socket"
+  fi
+
+  check_port_available "${HTTP_PORT:-$DEFAULT_HTTP_PORT}" "HTTP"
+  check_port_available "${HTTPS_PORT:-$DEFAULT_HTTPS_PORT}" "HTTPS"
+  check_port_available "${LOGTO_CONSOLE_PORT:-$DEFAULT_LOGTO_CONSOLE_PORT}" "Logto Console"
+
+  if [ $errors -gt 0 ]; then
+    log_error "$errors prerequisite(s) not met. Please install missing dependencies and retry."
+    exit 1
+  fi
+  log_success "All prerequisites met."
+}
+
+check_port_available() {
+  local port="$1" name="$2"
+  if command -v ss >/dev/null 2>&1; then
+    if ss -tlnp 2>/dev/null | grep -q ":${port} "; then
+      log_warn "Port $port ($name) is already in use."
+    fi
+  elif command -v netstat >/dev/null 2>&1; then
+    if netstat -tlnp 2>/dev/null | grep -q ":${port} "; then
+      log_warn "Port $port ($name) is already in use."
+    fi
+  fi
+}
+
+# --- Auto-detection ---
+
+auto_detect() {
+  if [ -z "$PUBLIC_HOST" ]; then
+    PUBLIC_HOST=$(hostname -f 2>/dev/null || hostname 2>/dev/null || echo "localhost")
+    local primary_ip
+    primary_ip=$(ip route get 1.1.1.1 2>/dev/null | awk '{print $7; exit}' || true)
+    if [ -n "$primary_ip" ]; then
+      local rdns
+      rdns=$(dig +short -x "$primary_ip" 2>/dev/null | sed 's/\.$//' || true)
+      [ -n "$rdns" ] && PUBLIC_HOST="$rdns"
+    fi
+  fi
+
+  if [ -z "$DOCKER_SOCKET" ]; then
+    DOCKER_SOCKET="$DEFAULT_DOCKER_SOCKET"
+  fi
+}
+
+detect_existing_install() {
+  local dir="${INSTALL_DIR:-$DEFAULT_INSTALL_DIR}"
+  if [ -f "$dir/cameleer.conf" ]; then
+    IS_RERUN=true
+    INSTALL_DIR="$dir"
+    load_config_file "$dir/cameleer.conf"
+  fi
+}