feat: 添加 Magisk v30.2 自动下载和提取功能，更新 init 服务配置，改进二进制文件提取逻辑，并新增 README 文档说明项目结构和使用方法。

extract.py

@@ -1,19 +1,58 @@
 #!/usr/bin/env python3
 import atexit
+import hashlib
 import os.path
 import re
 import shutil
 import subprocess
+import urllib.request
 import zipfile
 
 
+def calculate_md5(file_path):
+    """计算文件的 MD5 值"""
+    hash_md5 = hashlib.md5()
+    with open(file_path, "rb") as f:
+        for chunk in iter(lambda: f.read(4096), b""):
+            hash_md5.update(chunk)
+    return hash_md5.hexdigest()
+
+
+def download_file(url, file_path):
+    """下载文件"""
+    print(f"==> Downloading from {url}")
+    urllib.request.urlretrieve(url, file_path)
+
+
 def main():
     current_path = os.path.dirname(os.path.abspath(__file__))
     apk_path = os.path.join(current_path, "magisk.apk")
     unzip_path = os.path.join(current_path, "temp")
     overlay_path = os.path.join(current_path, "rootfs")
     overlay_magisk_path = os.path.join(overlay_path, "vendor", "etc", "init", "magisk")
-    overlay_init_path = os.path.join(overlay_path, "vendor", "etc", "init", "magisk.rc")
+    
+    # Magisk 下载配置
+    magisk_url = "https://github.com/topjohnwu/Magisk/releases/download/v30.2/Magisk-v30.2.apk"
+    expected_md5 = "2691c30ccf059af2536cb0af803c787c"
+    
+    # 检查并下载 Magisk APK
+    need_download = True
+    if os.path.exists(apk_path):
+        print("==> Checking existing Magisk APK...")
+        actual_md5 = calculate_md5(apk_path)
+        if actual_md5 == expected_md5:
+            print("==> Magisk APK already exists and verified!")
+            need_download = False
+        else:
+            print(f"==> MD5 mismatch. Expected: {expected_md5}, Got: {actual_md5}")
+    
+    if need_download:
+        print("==> Downloading Magisk v30.2...")
+        download_file(magisk_url, apk_path)
+        actual_md5 = calculate_md5(apk_path)
+        if actual_md5 != expected_md5:
+            raise Exception(f"Downloaded file MD5 verification failed! Expected: {expected_md5}, Got: {actual_md5}")
+        print("==> Download completed and verified!")
 
     shutil.rmtree(unzip_path, ignore_errors=True)
     os.makedirs(unzip_path, exist_ok=True)
@@ -27,17 +66,31 @@ def main():
     os.makedirs(overlay_magisk_path, exist_ok=True)
 
     print("==> Installing magisk now ...")
+    # Extract arm64 binaries
     lib64_path = os.path.join(unzip_path, "lib", "arm64-v8a")
     for parent, dirnames, filenames in os.walk(lib64_path):
         for filename in filenames:
             so_path = os.path.join(lib64_path, filename)
             so_name = re.search(r"lib(.*)\.so", filename)
-            target_path = os.path.join(overlay_magisk_path, so_name.group(1))
-            shutil.copyfile(so_path, target_path)
-            subprocess.check_call(["chmod", "+x", target_path])
+            if so_name:
+                target_path = os.path.join(overlay_magisk_path, so_name.group(1))
+                shutil.copyfile(so_path, target_path)
+                subprocess.check_call(["chmod", "+x", target_path])
 
+    # Extract arm32 magisk binary
     lib32_path = os.path.join(unzip_path, "lib", "armeabi-v7a")
-    shutil.copyfile(os.path.join(lib32_path, "libmagisk32.so"), os.path.join(overlay_magisk_path, "magisk32"))
+    magisk32_src = os.path.join(lib32_path, "libmagisk32.so")
+    magisk32_dst = os.path.join(overlay_magisk_path, "magisk32")
+    if os.path.exists(magisk32_src):
+        shutil.copyfile(magisk32_src, magisk32_dst)
+        subprocess.check_call(["chmod", "+x", magisk32_dst])
+
+    # Copy magisk.apk to target directory
+    apk_dst = os.path.join(overlay_magisk_path, "magisk.apk")
+    if os.path.exists(apk_path):
+        shutil.copyfile(apk_path, apk_dst)
+    
+    print("==> Magisk installation completed!")
 
 
 if __name__ == '__main__':