feat: add safe fresh reinstall option

README.md

@@ -36,8 +36,9 @@ bash <(curl -fsSL https://raw.githubusercontent.com/zxyszx/NewSzxcn-Email/main/i
 ```
 
 空白服务器会进入防火墙、邮件域名、管理员账号和 Web 部署方式的引导。检测到
-`/opt/newszxcn-email/.env` 时，脚本会先询问是更新现有邮局、修复现有安装还是退出；
+`/opt/newszxcn-email/.env` 时，脚本会先询问是更新现有邮局、修复现有安装、退出，
-不会再直接跳过引导并重启服务。更新会先备份数据库，并在启动失败时自动回滚。
+还是完整备份旧目录后全新安装；不会再直接跳过引导并重启服务。更新会先备份数据库，
+并在启动失败时自动回滚。
 
 脚本会自动完成：
 

install.sh

@@ -146,20 +146,20 @@ prompt_value() {
 }
 
 prompt_choice() {
-  local variable="$1" prompt="$2" default_value="$3" value
+  local variable="$1" prompt="$2" default_value="$3" max_value="${4:-3}" value
   value="${!variable:-}"
   while true; do
     if [[ -z "${value}" ]] && has_tty; then
       read -r -p "${prompt}" value </dev/tty
     fi
     value="${value:-${default_value}}"
-    if [[ "${value}" =~ ^[123]$ ]]; then
+    if [[ "${value}" =~ ^[0-9]+$ ]] && (( value >= 1 && value <= max_value )); then
       printf '%s' "${value}"
       return
     fi
-    prompt_text "[提示] 请输入 1、2 或 3。\n"
+    prompt_text "[提示] 请输入 1 至 ${max_value}。\n"
     value=""
-    has_tty || fail "${variable} 必须设置为 1、2 或 3。"
+    has_tty || fail "${variable} 必须设置为 1 至 ${max_value}。"
   done
 }
 
@@ -170,11 +170,11 @@ prompt_existing_install_action() {
   if [[ -n "${public_url}" ]]; then
     prompt_text "[发现] 当前访问地址：${public_url}\n"
   fi
-  prompt_text '请选择操作 [1]：\n1. 更新现有邮局（推荐，自动备份并支持回滚）\n2. 修复现有安装（保留配置和数据）\n3. 退出，不做任何修改\n'
+  prompt_text '请选择操作 [1]：\n1. 更新现有邮局（推荐，自动备份并支持回滚）\n2. 修复现有安装（保留配置和数据）\n3. 退出，不做任何修改\n4. 备份现有安装并全新安装\n'
   if [[ -z "${LANQIN_EXISTING_ACTION:-}" ]] && ! has_tty; then
     fail "非交互环境不能选择已有安装操作；更新请执行 newszxcn-email update。"
   fi
-  action="$(prompt_choice LANQIN_EXISTING_ACTION "请选择 [1]: " "1")"
+  action="$(prompt_choice LANQIN_EXISTING_ACTION "请选择 [1]: " "1" "4")"
   printf '%s' "${action}"
 }
 
@@ -612,6 +612,7 @@ do_install() {
       1) do_update ;;
       2) do_repair_install ;;
       3) success "已退出，现有邮局未作修改。" ;;
+      4) do_backup_reinstall ;;
     esac
     return
   fi
@@ -723,6 +724,31 @@ do_uninstall() {
   success "容器和自动生成的 Nginx 配置已移除，${INSTALL_DIR} 中的邮件、证书、配置和数据库仍然保留。"
 }
 
+do_backup_reinstall() {
+  local backup_dir
+  backup_dir="${INSTALL_DIR}.backup-$(date -u +%Y%m%dT%H%M%SZ)"
+
+  if [[ -f "${INSTALL_DIR}/docker-compose.yml" ]] && command -v docker >/dev/null 2>&1; then
+    ensure_docker
+    compose down --remove-orphans
+  fi
+  if [[ -f "${NGINX_CONFIG}" ]]; then
+    rm -f "${NGINX_CONFIG}"
+    if command -v nginx >/dev/null 2>&1 && nginx -t >/dev/null 2>&1; then
+      if command -v systemctl >/dev/null 2>&1; then
+        systemctl reload nginx
+      else
+        nginx -s reload
+      fi
+    fi
+  fi
+
+  mv "${INSTALL_DIR}" "${backup_dir}"
+  success "旧安装已完整备份到 ${backup_dir}。"
+  log "现在开始全新安装。"
+  do_install
+}
+
 if [[ "${LANQIN_SOURCE_ONLY:-false}" == "true" ]]; then
   if [[ "${BASH_SOURCE[0]}" != "$0" ]]; then
     return 0

tests/install_test.sh

@@ -122,9 +122,29 @@ test_existing_install_action() {
   assert_eq "2" "$(prompt_existing_install_action)" "existing install repair action"
   export LANQIN_EXISTING_ACTION=3
   assert_eq "3" "$(prompt_existing_install_action)" "existing install exit action"
+  export LANQIN_EXISTING_ACTION=4
+  assert_eq "4" "$(prompt_existing_install_action)" "existing install fresh action"
   unset LANQIN_EXISTING_ACTION
 }
 
+test_backup_reinstall_preserves_existing_directory() (
+  local temp_dir backup_dir
+  temp_dir="$(mktemp -d)"
+  INSTALL_DIR="${temp_dir}/newszxcn-email"
+  NGINX_CONFIG="${temp_dir}/newszxcn-email.conf"
+  mkdir -p "${INSTALL_DIR}"
+  printf 'existing-data\n' > "${INSTALL_DIR}/marker"
+
+  do_install() {
+    [[ ! -e "${INSTALL_DIR}" ]] || fail_test "fresh install started before old directory was moved"
+  }
+
+  do_backup_reinstall
+  backup_dir="$(find "${temp_dir}" -maxdepth 1 -type d -name 'newszxcn-email.backup-*' -print -quit)"
+  [[ -n "${backup_dir}" ]] || fail_test "existing install backup directory missing"
+  grep -Fq 'existing-data' "${backup_dir}/marker" || fail_test "existing install data was not preserved"
+)
+
 test_hostname_validation
 test_password_validation
 test_install_configuration 1 1 "127.0.0.1:8088" "https://mail.example.com" "false"
@@ -134,5 +154,6 @@ test_nginx_configuration
 test_compose_configuration
 test_legacy_configuration_is_preserved
 test_existing_install_action
+test_backup_reinstall_preserves_existing_directory
 
 printf 'install.sh tests passed\n'