From 6587f3783e5a34d8d7d2004aec4ae0bbbc676184 Mon Sep 17 00:00:00 2001
From: zj <1052308357@qq.com>
Date: Thu, 12 Feb 2026 03:55:30 +0800
Subject: [PATCH] 1

---
 backend.py | 26 +++++++++++++++++++-------
 1 file changed, 19 insertions(+), 7 deletions(-)

diff --git a/backend.py b/backend.py
index 2c00a49..b57206a 100644
--- a/backend.py
+++ b/backend.py
@@ -2022,13 +2022,18 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
                 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）
+        # GRUB2 要求环境块精确为 4096 字节（一个扇区）
         grubenv_path = os.path.join(mount_point, "boot", grub_dir_name, "grubenv")
         try:
+            # 构建 4096 字节的 grubenv 内容
+            header = "# GRUB Environment Block\n"
+            saved_entry = "saved_entry=\n"
+            # 计算需要填充的字节数（4096 - header - saved_entry - 结尾的 #）
+            padding_size = 4096 - len(header) - len(saved_entry) - 1
+            content = header + saved_entry + "#" * padding_size
             with open(grubenv_path, 'w') as f:
-                f.write("# GRUB Environment Block\n")
-                f.write("saved_entry=\n")
-                f.write("#" * 4096 + "\n")
-            log_success(f"✓ 创建 grubenv: {grubenv_path}")
+                f.write(content)
+            log_success(f"✓ 创建 grubenv ({os.path.getsize(grubenv_path)} 字节): {grubenv_path}")
         except Exception as e:
             log_warning(f"创建 grubenv 失败: {e}")
         
@@ -2379,8 +2384,11 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
                         os.makedirs(target_dir, exist_ok=True)
                         log_info(f"✓ 创建目录: {target_dir}")
                     
-                    # 创建目标文件（1024 字节的 GRUB 环境块）
-                    grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 4096 + "\n"
+                    # 创建目标文件（精确 4096 字节的 GRUB 环境块）
+                    header = "# GRUB Environment Block\n"
+                    saved_entry = "saved_entry=\n"
+                    padding_size = 4096 - len(header) - len(saved_entry) - 1
+                    grubenv_content = header + saved_entry + "#" * padding_size
                     with open(target_path, 'w') as f:
                         f.write(grubenv_content)
                     log_success(f"✓ 创建符号链接目标文件: {target_path}")
@@ -2400,7 +2408,11 @@ def chroot_and_repair_grub(mount_point: str, target_disk: str,
                 
                 # 方法: 使用 echo 和 tee 在 chroot 内创建文件
                 grubenv_chroot_path = grubenv_dir_in_chroot + "/grubenv"
-                grubenv_content = "# GRUB Environment Block\nsaved_entry=\n" + "#" * 4096 + "\n"
+                # 精确 4096 字节的 grubenv
+                header = "# GRUB Environment Block\n"
+                saved_entry = "saved_entry=\n"
+                padding_size = 4096 - len(header) - len(saved_entry) - 1
+                grubenv_content = header + saved_entry + "#" * padding_size
                 
                 # 使用 printf 创建文件（更可靠）
                 success, _, stderr = run_command(