原文地址：[FAQ202072305]android10.0 user版本下开启adb root权限方法

[QUESTION]

有些客户问题须要开启开发这模式，打开usb debug调试方式，并在user版本下打开adb root权限调查

[ANSWER]

开启adb root权限和打开adb调试方法如下：

1、开启adb root
  1. /// platform/system/core/init/selinux.cpp
  2. bool IsEnforcing() {
  3.     return false;<<<-------直接返回false
  4. }
  1. /// platform/system/core/adb/daemon/main.cpp
  2. static bool should_drop_privileges() {
  3. #if defined(ALLOW_ADBD_ROOT)
  4.     // The properties that affect `adb root` and `adb unroot` are ro.secure and
  5.     // ro.debuggable. In this context the names don't make the expected behavior
  6.     // particularly obvious.
  7.     //
  8.     // ro.debuggable:
  9.     //   Allowed to become root, but not necessarily the default. Set to 1 on
  10.     //   eng and userdebug builds.
  11.     //
  12.     // ro.secure:
  13.     //   Drop privileges by default. Set to 1 on userdebug and user builds.
  14.     bool ro_secure = android::base::GetBoolProperty("ro.secure", true);
  15.     bool ro_debuggable = __android_log_is_debuggable();
  17.     // Drop privileges if ro.secure is set...
  18.     bool drop = ro_secure;
  20.     // ... except "adb root" lets you keep privileges in a debuggable build.
  21.     std::string prop = android::base::GetProperty("service.adb.root", "");
  22.     bool adb_root = (prop == "1");
  23.     bool adb_unroot = (prop == "0");
  24.     if (ro_debuggable && adb_root) {
  25.         drop = false;
  26.     }
  27.     // ... and "adb unroot" lets you explicitly drop privileges.
  28.     if (adb_unroot) {
  29.         drop = true;
  30.     }
  32.     return drop;
  33. #else
  34.     return false; // "adb root" not allowed, always drop privileges.<<<<<<<---------改为false
  35. #endif // ALLOW_ADBD_ROOT
  36. }

2、打开 adb 调试

user版本开启adb调试，注意python代码的缩进变化问题。

  1. ### build / tools/post_process_props.py
  2.   if prop.get("ro.debuggable") == "1":
  3.     val = prop.get("persist.sys.usb.config")
  4.     if "adb" not in val:
  5.       if val == "":
  6.         val = "adb"
  7.       else:
  8.         val = val + ",adb"
  9.       prop.put("persist.sys.usb.config", val)

修改为

  1.  #if prop.get("ro.debuggable") == "1":
  2.   val = prop.get("persist.sys.usb.config")
  3.   if "adb" not in val:
  4.     if val == "":
  5.       val = "adb"
  6.     else:
  7.       val = val + ",adb"
  8.     prop.put("persist.sys.usb.config", val)