fix

backend.py

@@ -3,16 +3,51 @@
 import subprocess
 import os
 import json
-import time # 用于模拟耗时操作，实际可移除
+import time
+import re
+import shutil
+from typing import Tuple, List, Dict, Optional
 
-def run_command(command, description="执行命令", cwd=None, shell=False):
+# 常量配置
+COMMAND_TIMEOUT = 300  # 命令执行超时时间（秒）
+DEFAULT_GRUB_CONFIG_PATHS = [
+    "/boot/grub/grub.cfg",
+    "/boot/grub2/grub.cfg",
+]
+
+
+def validate_device_path(path: str) -> bool:
+    """
+    验证设备路径格式是否合法（防止命令注入）。
+    :param path: 设备路径（如 /dev/sda1, /dev/mapper/cl-root）
+    :return: 是否合法
+    """
+    if not path:
+        return False
+    # 允许的格式:
+    # - /dev/sda, /dev/sda1
+    # - /dev/nvme0n1, /dev/nvme0n1p1
+    # - /dev/mmcblk0, /dev/mmcblk0p1
+    # - /dev/mapper/xxx (LVM逻辑卷)
+    # - /dev/dm-0 等
+    patterns = [
+        r'^/dev/[a-zA-Z0-9_-]+$',
+        r'^/dev/mapper/[a-zA-Z0-9_-]+$',
+    ]
+    return any(re.match(pattern, path) is not None for pattern in patterns)
+
+
+def run_command(command: List[str], description: str = "执行命令", 
+                cwd: Optional[str] = None, shell: bool = False,
+                timeout: int = COMMAND_TIMEOUT) -> Tuple[bool, str, str]:
     """
     运行一个系统命令，并捕获其输出和错误。
     :param command: 要执行的命令列表 (例如 ["sudo", "lsblk"])
     :param description: 命令的描述，用于日志
     :param cwd: 更改工作目录
-    :param shell: 是否使用shell执行命令 (通常不推荐，除非命令需要shell特性)
-    :return: (True/False, stdout, stderr) 表示成功、标准输出、标准错误
+    :param shell: 是否使用shell执行命令
+    :param timeout: 命令超时时间（秒）
+    :return: (success, stdout, stderr) 表示成功、标准输出、标准错误
     """
     try:
         print(f"[Backend] {description}: {' '.join(command)}")
@@ -20,9 +55,10 @@ def run_command(command, description="执行命令", cwd=None, shell=False):
             command,
             capture_output=True,
             text=True,
-            check=True,  # 如果命令返回非零退出码，将抛出CalledProcessError
+            check=True,
             cwd=cwd,
-            shell=shell
+            shell=shell,
+            timeout=timeout
         )
         print(f"[Backend] 命令成功: {description}")
         return True, result.stdout, result.stderr
@@ -30,6 +66,9 @@ def run_command(command, description="执行命令", cwd=None, shell=False):
         print(f"[Backend] 命令失败: {description}")
         print(f"[Backend] 错误输出: {e.stderr}")
         return False, e.stdout, e.stderr
+    except subprocess.TimeoutExpired:
+        print(f"[Backend] 命令超时: {description}")
+        return False, "", f"命令执行超时（超过 {timeout} 秒）"
     except FileNotFoundError:
         print(f"[Backend] 命令未找到: {' '.join(command)}")
         return False, "", f"命令未找到: {command[0]}"
@@ -37,16 +76,103 @@ def run_command(command, description="执行命令", cwd=None, shell=False):
         print(f"[Backend] 发生未知错误: {e}")
         return False, "", str(e)
 
-def scan_partitions():
+
+def _process_partition(block_device: Dict, all_disks: List, all_partitions: List, 
+                       all_efi_partitions: List) -> None:
+    """
+    处理单个块设备，递归处理子分区、LVM逻辑卷等。
+    """
+    dev_name = f"/dev/{block_device.get('name', '')}"
+    dev_type = block_device.get("type")
+
+    if dev_type == "disk":
+        all_disks.append({"name": dev_name})
+        # 递归处理子分区
+        for child in block_device.get("children", []):
+            _process_partition(child, all_disks, all_partitions, all_efi_partitions)
+    
+    elif dev_type == "part":
+        # 过滤掉Live系统自身的分区
+        mountpoint = block_device.get("mountpoint")
+        if mountpoint and (mountpoint == "/" or 
+                          mountpoint.startswith("/run/media") or 
+                          mountpoint.startswith("/cdrom") or
+                          mountpoint.startswith("/live")):
+            # 继续处理子设备（如LVM），但自己不被标记为可用分区
+            for child in block_device.get("children", []):
+                _process_partition(child, all_disks, all_partitions, all_efi_partitions)
+            return
+
+        part_info = {
+            "name": dev_name,
+            "fstype": block_device.get("fstype", "unknown"),
+            "size": block_device.get("size", "unknown"),
+            "mountpoint": mountpoint,
+            "uuid": block_device.get("uuid"),
+            "partlabel": block_device.get("partlabel"),
+            "label": block_device.get("label"),
+            "parttype": (block_device.get("parttype") or "").upper()  # EFI分区类型GUID
+        }
+        all_partitions.append(part_info)
+
+        # 识别EFI系统分区 (FAT32文件系统, 且满足以下条件之一)
+        is_vfat = part_info["fstype"] == "vfat"
+        has_efi_label = part_info["partlabel"] and "EFI" in part_info["partlabel"].upper()
+        has_efi_name = part_info["label"] and "EFI" in part_info["label"].upper()
+        is_efi_type = part_info["parttype"] == "C12A7328-F81F-11D2-BA4B-00A0C93EC93B"
+        
+        if is_vfat and (has_efi_label or has_efi_name or is_efi_type):
+            all_efi_partitions.append(part_info)
+        
+        # 递归处理子设备（如LVM逻辑卷）
+        for child in block_device.get("children", []):
+            _process_partition(child, all_disks, all_partitions, all_efi_partitions)
+    
+    elif dev_type in ["lvm", "dm"]:
+        # 处理LVM逻辑卷和Device Mapper设备
+        mountpoint = block_device.get("mountpoint")
+        
+        # 过滤Live系统自身的挂载点
+        if mountpoint and (mountpoint == "/" or 
+                          mountpoint.startswith("/run/media") or 
+                          mountpoint.startswith("/cdrom") or
+                          mountpoint.startswith("/live")):
+            pass  # 仍然添加到分区列表，但标记一下
+        
+        # 尝试获取mapper路径（如 /dev/mapper/cl-root）
+        lv_name = block_device.get("name", "")
+        # 如果名称中包含'-'，可能是mapper设备
+        if "-" in lv_name and not lv_name.startswith("dm-"):
+            mapper_path = f"/dev/mapper/{lv_name}"
+        else:
+            mapper_path = dev_name
+        
+        part_info = {
+            "name": mapper_path,
+            "fstype": block_device.get("fstype", "unknown"),
+            "size": block_device.get("size", "unknown"),
+            "mountpoint": mountpoint,
+            "uuid": block_device.get("uuid"),
+            "partlabel": block_device.get("partlabel"),
+            "label": block_device.get("label"),
+            "parttype": (block_device.get("parttype") or "").upper(),
+            "is_lvm": True,
+            "dm_name": lv_name
+        }
+        all_partitions.append(part_info)
+        
+        # 递归处理可能的子设备
+        for child in block_device.get("children", []):
+            _process_partition(child, all_disks, all_partitions, all_efi_partitions)
+
+
+def scan_partitions() -> Tuple[bool, List, List, List, str]:
     """
     扫描系统中的所有磁盘和分区，并返回结构化的信息。
     :return: (success, disks, partitions, efi_partitions, error_message)
-             disks: list of {"name": "/dev/sda"}
-             partitions: list of {"name": "/dev/sda1", "fstype": "ext4", "size": "100G", "mountpoint": "/"}
-             efi_partitions: list of {"name": "/dev/sda1", "fstype": "vfat", "size": "512M"}
     """
     success, stdout, stderr = run_command(
-        ["sudo", "lsblk", "-J", "-o", "NAME,FSTYPE,SIZE,MOUNTPOINT,UUID,PARTLABEL,LABEL,TYPE"],
+        ["sudo", "lsblk", "-J", "-o", "NAME,FSTYPE,SIZE,MOUNTPOINT,UUID,PARTLABEL,LABEL,TYPE,PARTTYPE"],
         "扫描分区"
     )
 
@@ -60,31 +186,7 @@ def scan_partitions():
         all_efi_partitions = []
 
         for block_device in data.get("blockdevices", []):
-            dev_name = f"/dev/{block_device['name']}"
-            dev_type = block_device.get("type")
-
-            if dev_type == "disk":
-                all_disks.append({"name": dev_name})
-            elif dev_type == "part":
-                # 过滤掉Live系统自身的分区（基于常见的Live环境挂载点）
-                mountpoint = block_device.get("mountpoint")
-                if mountpoint and (mountpoint == "/" or mountpoint.startswith("/run/media") or mountpoint.startswith("/cdrom")):
-                    continue
-
-                part_info = {
-                    "name": dev_name,
-                    "fstype": block_device.get("fstype", "unknown"),
-                    "size": block_device.get("size", "unknown"),
-                    "mountpoint": mountpoint,
-                    "uuid": block_device.get("uuid"),
-                    "partlabel": block_device.get("partlabel"),
-                    "label": block_device.get("label")
-                }
-                all_partitions.append(part_info)
-
-                # 识别EFI系统分区 (FAT32文件系统, 且通常有特定标签或名称)
-                if part_info["fstype"] == "vfat" and (part_info["partlabel"] == "EFI System Partition" or part_info["label"] == "EFI"):
-                    all_efi_partitions.append(part_info)
+            _process_partition(block_device, all_disks, all_partitions, all_efi_partitions)
         
         return True, all_disks, all_partitions, all_efi_partitions, ""
 
@@ -93,21 +195,77 @@ def scan_partitions():
     except Exception as e:
         return False, [], [], [], f"处理分区数据时发生未知错误: {e}"
 
-def mount_target_system(root_partition, boot_partition=None, efi_partition=None):
+
+def _cleanup_partial_mount(mount_point: str, mounted_boot: bool, mounted_efi: bool, 
+                           bind_paths_mounted: List[str]) -> None:
+    """
+    清理部分挂载的资源（用于挂载失败时的回滚）。
+    """
+    print(f"[Backend] 清理部分挂载资源: {mount_point}")
+    
+    # 逆序卸载已绑定的路径
+    for target_path in reversed(bind_paths_mounted):
+        if os.path.ismount(target_path):
+            run_command(["sudo", "umount", target_path], f"清理卸载绑定 {target_path}")
+    
+    # 卸载EFI分区
+    if mounted_efi:
+        efi_mount_point = os.path.join(mount_point, "boot/efi")
+        if os.path.ismount(efi_mount_point):
+            run_command(["sudo", "umount", efi_mount_point], "清理卸载EFI分区")
+    
+    # 卸载/boot分区
+    if mounted_boot:
+        boot_mount_point = os.path.join(mount_point, "boot")
+        if os.path.ismount(boot_mount_point):
+            run_command(["sudo", "umount", boot_mount_point], "清理卸载/boot分区")
+    
+    # 卸载根分区
+    if os.path.ismount(mount_point):
+        run_command(["sudo", "umount", mount_point], "清理卸载根分区")
+    
+    # 删除临时目录
+    if os.path.exists(mount_point) and not os.path.ismount(mount_point):
+        try:
+            os.rmdir(mount_point)
+        except OSError:
+            pass
+
+
+def mount_target_system(root_partition: str, boot_partition: Optional[str] = None, 
+                        efi_partition: Optional[str] = None) -> Tuple[bool, str, str]:
     """
     挂载目标系统的根分区、/boot分区和EFI分区到临时目录。
-    :param root_partition: 目标系统的根分区设备路径 (例如 /dev/sda1)
+    :param root_partition: 目标系统的根分区设备路径
     :param boot_partition: 目标系统的独立 /boot 分区设备路径 (可选)
     :param efi_partition: 目标系统的EFI系统分区设备路径 (可选，仅UEFI)
     :return: (True/False, mount_point, error_message)
     """
-    mount_point = "/mnt_grub_repair_" + str(int(time.time())) # 确保唯一性
-    if not os.path.exists(mount_point):
-        os.makedirs(mount_point)
+    # 验证输入
+    if not validate_device_path(root_partition):
+        return False, "", f"无效的根分区路径: {root_partition}"
+    if boot_partition and not validate_device_path(boot_partition):
+        return False, "", f"无效的/boot分区路径: {boot_partition}"
+    if efi_partition and not validate_device_path(efi_partition):
+        return False, "", f"无效的EFI分区路径: {efi_partition}"
+    
+    # 创建临时挂载点
+    mount_point = "/mnt_grub_repair_" + str(int(time.time()))
+    try:
+        os.makedirs(mount_point, exist_ok=False)
+    except Exception as e:
+        return False, "", f"创建挂载点失败: {e}"
+
+    # 跟踪已挂载的资源，用于失败时清理
+    bind_paths_mounted = []
+    mounted_boot = False
+    mounted_efi = False
 
     # 1. 挂载根分区
-    success, _, stderr = run_command(["sudo", "mount", root_partition, mount_point], f"挂载根分区 {root_partition}")
+    success, _, stderr = run_command(["sudo", "mount", root_partition, mount_point], 
+                                      f"挂载根分区 {root_partition}")
     if not success:
+        os.rmdir(mount_point)
         return False, "", f"挂载根分区失败: {stderr}"
 
     # 2. 如果有独立 /boot 分区
@@ -115,20 +273,24 @@ def mount_target_system(root_partition, boot_partition=None, efi_partition=None)
         boot_mount_point = os.path.join(mount_point, "boot")
         if not os.path.exists(boot_mount_point):
             os.makedirs(boot_mount_point)
-        success, _, stderr = run_command(["sudo", "mount", boot_partition, boot_mount_point], f"挂载 /boot 分区 {boot_partition}")
+        success, _, stderr = run_command(["sudo", "mount", boot_partition, boot_mount_point], 
+                                          f"挂载 /boot 分区 {boot_partition}")
         if not success:
-            unmount_target_system(mount_point) # 挂载失败，尝试清理
+            _cleanup_partial_mount(mount_point, False, False, [])
             return False, "", f"挂载 /boot 分区失败: {stderr}"
+        mounted_boot = True
 
     # 3. 如果有EFI分区 (UEFI系统)
     if efi_partition:
         efi_mount_point = os.path.join(mount_point, "boot/efi")
         if not os.path.exists(efi_mount_point):
             os.makedirs(efi_mount_point)
-        success, _, stderr = run_command(["sudo", "mount", efi_partition, efi_mount_point], f"挂载 EFI 分区 {efi_partition}")
+        success, _, stderr = run_command(["sudo", "mount", efi_partition, efi_mount_point], 
+                                          f"挂载 EFI 分区 {efi_partition}")
         if not success:
-            unmount_target_system(mount_point) # 挂载失败，尝试清理
+            _cleanup_partial_mount(mount_point, mounted_boot, False, [])
             return False, "", f"挂载 EFI 分区失败: {stderr}"
+        mounted_efi = True
 
     # 4. 绑定必要的伪文件系统
     bind_paths = ["/dev", "/dev/pts", "/proc", "/sys", "/run"]
@@ -136,63 +298,108 @@ def mount_target_system(root_partition, boot_partition=None, efi_partition=None)
         target_path = os.path.join(mount_point, path.lstrip('/'))
         if not os.path.exists(target_path):
             os.makedirs(target_path)
-        success, _, stderr = run_command(["sudo", "mount", "--bind", path, target_path], f"绑定 {path} 到 {target_path}")
+        success, _, stderr = run_command(["sudo", "mount", "--bind", path, target_path], 
+                                          f"绑定 {path} 到 {target_path}")
         if not success:
-            unmount_target_system(mount_point) # 绑定失败，尝试清理
+            _cleanup_partial_mount(mount_point, mounted_boot, mounted_efi, bind_paths_mounted)
             return False, "", f"绑定 {path} 失败: {stderr}"
+        bind_paths_mounted.append(target_path)
 
     return True, mount_point, ""
 
-def detect_distro_type(mount_point):
+
+def detect_distro_type(mount_point: str) -> str:
     """
     尝试检测目标系统发行版类型。
     :param mount_point: 目标系统根分区的挂载点
-    :return: "arch", "centos", "debian", "ubuntu", "unknown"
+    :return: "arch", "centos", "debian", "ubuntu", "fedora", "opensuse", "unknown"
     """
     os_release_path = os.path.join(mount_point, "etc/os-release")
     if not os.path.exists(os_release_path):
+        # 尝试 /etc/issue 作为备选
+        issue_path = os.path.join(mount_point, "etc/issue")
+        if os.path.exists(issue_path):
+            try:
+                with open(issue_path, "r") as f:
+                    content = f.read().lower()
+                    if "ubuntu" in content:
+                        return "ubuntu"
+                    elif "debian" in content:
+                        return "debian"
+                    elif "centos" in content or "rhel" in content:
+                        return "centos"
+                    elif "fedora" in content:
+                        return "fedora"
+            except Exception:
+                pass
         return "unknown"
 
     try:
         with open(os_release_path, "r") as f:
             content = f.read()
-            if "ID=arch" in content:
-                return "arch"
-            elif "ID=centos" in content or "ID=rhel" in content:
-                return "centos"
-            elif "ID=debian" in content:
-                return "debian"
-            elif "ID=ubuntu" in content:
-                return "ubuntu"
-            else:
-                return "unknown"
+            
+        # 解析 ID 和 ID_LIKE 字段
+        id_match = re.search(r'^ID=(.+)$', content, re.MULTILINE)
+        id_like_match = re.search(r'^ID_LIKE=(.+)$', content, re.MULTILINE)
+        
+        distro_id = id_match.group(1).strip('"\'') if id_match else ""
+        id_like = id_like_match.group(1).strip('"\'') if id_like_match else ""
+        
+        # 直接匹配
+        if distro_id == "ubuntu":
+            return "ubuntu"
+        elif distro_id == "debian":
+            return "debian"
+        elif distro_id in ["arch", "manjaro", "endeavouros"]:
+            return "arch"
+        elif distro_id in ["centos", "rhel", "rocky", "almalinux"]:
+            return "centos"
+        elif distro_id == "fedora":
+            return "fedora"
+        elif distro_id in ["opensuse", "opensuse-leap", "opensuse-tumbleweed"]:
+            return "opensuse"
+        
+        # 通过 ID_LIKE 推断
+        if "ubuntu" in id_like:
+            return "ubuntu"
+        elif "debian" in id_like:
+            return "debian"
+        elif "arch" in id_like:
+            return "arch"
+        elif "rhel" in id_like or "centos" in id_like or "fedora" in id_like:
+            return "centos"  # 使用centos命令集
+        elif "suse" in id_like:
+            return "opensuse"
+        
+        return "unknown"
     except Exception as e:
         print(f"[Backend] 无法读取os-release文件: {e}")
         return "unknown"
 
-def chroot_and_repair_grub(mount_point, target_disk, is_uefi=False, distro_type="unknown"):
+
+def chroot_and_repair_grub(mount_point: str, target_disk: str, 
+                           is_uefi: bool = False, distro_type: str = "unknown") -> Tuple[bool, str]:
     """
     Chroot到目标系统并执行GRUB修复命令。
     :param mount_point: 目标系统根分区的挂载点
-    :param target_disk: GRUB要安装到的物理磁盘 (例如 /dev/sda)
+    :param target_disk: GRUB要安装到的物理磁盘
     :param is_uefi: 目标系统是否使用UEFI启动
-    :param distro_type: 目标系统发行版类型 (用于选择正确的GRUB命令)
+    :param distro_type: 目标系统发行版类型
     :return: (True/False, error_message)
     """
+    if not validate_device_path(target_disk):
+        return False, f"无效的目标磁盘路径: {target_disk}"
+    
     chroot_cmd_prefix = ["sudo", "chroot", mount_point]
 
     # 1. 安装GRUB到目标磁盘
     if is_uefi:
-        # UEFI系统，需要确保EFI分区已挂载到 /boot/efi
-        # grub-install --target=x86_64-efi --efi-directory=/boot/efi --bootloader-id=GRUB
-        # 注意：某些系统可能需要指定 --removable 选项，以便在某些固件上更容易启动
-        # 统一使用 --bootloader-id=GRUB，如果已存在会更新
         success, _, stderr = run_command(
-            chroot_cmd_prefix + ["grub-install", "--target=x86_64-efi", "--efi-directory=/boot/efi", "--bootloader-id=GRUB"],
+            chroot_cmd_prefix + ["grub-install", "--target=x86_64-efi", 
+                                 "--efi-directory=/boot/efi", "--bootloader-id=GRUB"],
             "安装UEFI GRUB"
         )
     else:
-        # BIOS系统，安装到MBR
         success, _, stderr = run_command(
             chroot_cmd_prefix + ["grub-install", target_disk],
             "安装BIOS GRUB"
@@ -203,14 +410,30 @@ def chroot_and_repair_grub(mount_point, target_disk, is_uefi=False, distro_type=
     # 2. 更新GRUB配置文件
     grub_update_cmd = []
     if distro_type in ["debian", "ubuntu"]:
-        grub_update_cmd = ["update-grub"] # 这是一个脚本，实际是调用grub-mkconfig
+        grub_update_cmd = ["update-grub"]
     elif distro_type == "arch":
         grub_update_cmd = ["grub-mkconfig", "-o", "/boot/grub/grub.cfg"]
     elif distro_type == "centos":
-        grub_update_cmd = ["grub2-mkconfig", "-o", "/boot/grub2/grub.cfg"] # CentOS 8/9
+        # 检测实际存在的配置文件路径
+        grub2_path = os.path.join(mount_point, "boot/grub2/grub.cfg")
+        grub_path = os.path.join(mount_point, "boot/grub/grub.cfg")
+        if os.path.exists(os.path.dirname(grub2_path)):
+            grub_update_cmd = ["grub2-mkconfig", "-o", "/boot/grub2/grub.cfg"]
+        else:
+            grub_update_cmd = ["grub2-mkconfig", "-o", "/boot/grub/grub.cfg"]
+    elif distro_type == "fedora":
+        grub_update_cmd = ["grub2-mkconfig", "-o", "/boot/grub2/grub.cfg"]
+    elif distro_type == "opensuse":
+        grub_update_cmd = ["grub2-mkconfig", "-o", "/boot/grub2/grub.cfg"]
     else:
-        # 尝试通用命令
-        grub_update_cmd = ["grub-mkconfig", "-o", "/boot/grub/grub.cfg"]
+        # 尝试通用命令，先检测配置文件路径
+        for cfg_path in ["/boot/grub/grub.cfg", "/boot/grub2/grub.cfg"]:
+            full_path = os.path.join(mount_point, cfg_path.lstrip('/'))
+            if os.path.exists(os.path.dirname(full_path)):
+                grub_update_cmd = ["grub-mkconfig", "-o", cfg_path]
+                break
+        else:
+            grub_update_cmd = ["grub-mkconfig", "-o", "/boot/grub/grub.cfg"]
 
     success, _, stderr = run_command(
         chroot_cmd_prefix + grub_update_cmd,
@@ -221,7 +444,8 @@ def chroot_and_repair_grub(mount_point, target_disk, is_uefi=False, distro_type=
 
     return True, ""
 
-def unmount_target_system(mount_point):
+
+def unmount_target_system(mount_point: str) -> Tuple[bool, str]:
     """
     卸载所有挂载的分区。
     :param mount_point: 目标系统根分区的挂载点
@@ -231,17 +455,21 @@ def unmount_target_system(mount_point):
     success = True
     error_msg = ""
 
-    # 逆序卸载绑定
+    # 按照挂载的逆序卸载：
+    # 挂载顺序: /dev, /dev/pts, /proc, /sys, /run, /boot/efi, /boot, 根分区
+    # 卸载顺序: /run, /sys, /proc, /dev/pts, /dev, /boot/efi, /boot, 根分区
+    
+    # 1. 卸载绑定路径（先卸载子目录）
     bind_paths = ["/run", "/sys", "/proc", "/dev/pts", "/dev"]
-    for path in reversed(bind_paths): # 逆序
+    for path in bind_paths:
         target_path = os.path.join(mount_point, path.lstrip('/'))
-        if os.path.ismount(target_path): # 检查是否真的挂载了
+        if os.path.ismount(target_path):
             s, _, stderr = run_command(["sudo", "umount", target_path], f"卸载绑定 {target_path}")
             if not s:
                 success = False
                 error_msg += f"卸载绑定 {target_path} 失败: {stderr}\n"
 
-    # 卸载 /boot/efi (如果存在)
+    # 2. 卸载 /boot/efi (如果存在)
     efi_mount_point = os.path.join(mount_point, "boot/efi")
     if os.path.ismount(efi_mount_point):
         s, _, stderr = run_command(["sudo", "umount", efi_mount_point], f"卸载 {efi_mount_point}")
@@ -249,7 +477,7 @@ def unmount_target_system(mount_point):
             success = False
             error_msg += f"卸载 {efi_mount_point} 失败: {stderr}\n"
 
-    # 卸载 /boot (如果存在)
+    # 3. 卸载 /boot (如果存在且是独立挂载的)
     boot_mount_point = os.path.join(mount_point, "boot")
     if os.path.ismount(boot_mount_point):
         s, _, stderr = run_command(["sudo", "umount", boot_mount_point], f"卸载 {boot_mount_point}")
@@ -257,25 +485,25 @@ def unmount_target_system(mount_point):
             success = False
             error_msg += f"卸载 {boot_mount_point} 失败: {stderr}\n"
 
-    # 卸载根分区
+    # 4. 卸载根分区
     if os.path.ismount(mount_point):
         s, _, stderr = run_command(["sudo", "umount", mount_point], f"卸载根分区 {mount_point}")
         if not s:
             success = False
             error_msg += f"卸载根分区 {mount_point} 失败: {stderr}\n"
     
-    # 清理临时挂载点目录
+    # 5. 清理临时挂载点目录
     if os.path.exists(mount_point) and not os.path.ismount(mount_point):
         try:
-            os.rmdir(mount_point)
+            shutil.rmtree(mount_point)
             print(f"[Backend] 清理临时目录 {mount_point}")
         except OSError as e:
             print(f"[Backend] 无法删除临时目录 {mount_point}: {e}")
             error_msg += f"无法删除临时目录 {mount_point}: {e}\n"
 
-
     return success, error_msg
 
+
 # 示例：如果直接运行backend.py，可以进行一些测试
 if __name__ == "__main__":
     print("--- 运行后端测试 ---")