1

backend.py

@@ -1962,6 +1962,78 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
         else:
             log_warning(f"✗ EFI 目录不存在: {efi_check_path}")
         
+        # ===== 清空并重建 GRUB 环境（针对严重损坏的系统）=====
+        log_step("清空并重建 GRUB 环境")
+        
+        # 确定正确的 GRUB 目录名
+        if distro_type in ["centos", "rhel", "fedora", "rocky", "almalinux", "opensuse"]:
+            grub_dir_name = "grub2"
+        else:
+            grub_dir_name = "grub"
+        
+        # 1. 清空 /boot/grub* 目录
+        boot_grub_paths = [
+            os.path.join(mount_point, "boot", "grub"),
+            os.path.join(mount_point, "boot", "grub2"),
+        ]
+        for grub_path in boot_grub_paths:
+            if os.path.exists(grub_path):
+                log_info(f"清空目录: {grub_path}")
+                try:
+                    # 删除目录内所有内容但保留目录本身
+                    for item in os.listdir(grub_path):
+                        item_path = os.path.join(grub_path, item)
+                        if os.path.isfile(item_path) or os.path.islink(item_path):
+                            os.unlink(item_path)
+                            log_debug(f"  删除文件: {item}")
+                        elif os.path.isdir(item_path):
+                            import shutil
+                            shutil.rmtree(item_path)
+                            log_debug(f"  删除目录: {item}")
+                    log_success(f"✓ 已清空: {grub_path}")
+                except Exception as e:
+                    log_warning(f"清空失败: {e}")
+        
+        # 2. 清空 EFI 分区中的 GRUB 相关目录
+        efi_cleanup_dirs = ["GRUB", "grub", "Boot", "boot", "centos", "redhat", "fedora"]
+        for efi_dir in efi_cleanup_dirs:
+            efi_dir_path = os.path.join(mount_point, "boot/efi/EFI", efi_dir)
+            if os.path.exists(efi_dir_path):
+                log_info(f"清空 EFI 目录: {efi_dir_path}")
+                try:
+                    import shutil
+                    shutil.rmtree(efi_dir_path)
+                    log_success(f"✓ 已删除: {efi_dir_path}")
+                except Exception as e:
+                    log_warning(f"删除失败: {e}")
+        
+        # 3. 重建目录结构
+        log_info("重建 GRUB 目录结构...")
+        dirs_to_create = [
+            os.path.join(mount_point, "boot", grub_dir_name),
+            os.path.join(mount_point, "boot/efi/EFI", efi_bootloader_id),
+            os.path.join(mount_point, "boot/efi/EFI", "Boot"),
+        ]
+        for dir_path in dirs_to_create:
+            try:
+                os.makedirs(dir_path, exist_ok=True)
+                log_info(f"✓ 创建目录: {dir_path}")
+            except Exception as e:
+                log_warning(f"创建目录失败: {e}")
+        
+        # 4. 创建 grubenv 文件（普通文件，不是符号链接）
+        grubenv_path = os.path.join(mount_point, "boot", grub_dir_name, "grubenv")
+        try:
+            with open(grubenv_path, 'w') as f:
+                f.write("# GRUB Environment Block\n")
+                f.write("saved_entry=\n")
+                f.write("#" * 1024 + "\n")
+            log_success(f"✓ 创建 grubenv: {grubenv_path}")
+        except Exception as e:
+            log_warning(f"创建 grubenv 失败: {e}")
+        
+        log_success("✓ GRUB 环境重建完成")
+        
         grub_install_cmd = chroot_cmd_prefix + [
             _grub_install_cmd,
             f"--target={efi_target}",