rk android8.1加密,Android 8.1RK平台增加自定义脚本，修改文件权限

最近RK3326项目上遇到个问题，OTA升级完重启后需要去/cache/recovery目录下读取一个文件，last_flag,读取过程中报错，提示没有权限，很奇怪，我的明明是系统应用，也加了权限还是报错，所以写个脚本在读取文件之前先设置一下文件的权限，这样就能读取到文件里面的内容。

首先建立一个脚本 rp_update_file.sh ，内容很简单，就是修改下文件权限如下

#！/system/bin/sh

chmod 777 /cache/recovery/last_flag

文件放在device/rockchip/rk3326目录下，然后在init.rk3326.rc中添加一个服务，

#for rp file update

service rp_update_file /system/bin/sh /system/etc/rp_update_file.sh

class main

user root

group root

disabled

oneshot

seclabel u:r:shell:s0

再增加一个变量来控制这个服务

on property:persist.rpfileupdate.enable=1

start rp_update_file

on property:persist.rpfileupdate.enable=0

stop rp_update_file

设置一个property，当persist.rpfileupdate.enable=1 时就会去执行这个脚本。

当然还需要给这个脚本添加权限，在system/core/libcutilsfs_config.cpp 目录中增加

diff --git a/core/libcutils/fs_config.cpp b/core/libcutils/fs_config.cpp

old mode 100644

new mode 100755

index cc96ff8..9399694

--- a/core/libcutils/fs_config.cpp

+++ b/core/libcutils/fs_config.cpp

@@ -162,6 +162,8 @@ static const struct fs_path_config android_files[] = {

{ 00600, AID_ROOT, AID_ROOT, 0, "vendor/default.prop" },

{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_dir + 1 },

{ 00444, AID_ROOT, AID_ROOT, 0, ven_conf_file + 1 },

+ { 00755, AID_ROOT, AID_ROOT, 0, "system/etc/rp_update_file.sh" },

// the following two files are INTENTIONALLY set-uid, but they

// are NOT included on user builds.

OK这样脚本就加好了，然后在android代码中读取文件之前设置一下property，代码如下

package com.rp.rpreceiver;

import android.app.AlertDialog;

import android.content.BroadcastReceiver;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.os.Handler;

import android.os.Message;

import android.os.RecoverySystem;

import android.os.storage.StorageManager;

import android.provider.Settings;

import android.util.Log;

import android.view.WindowManager;

import android.widget.Toast;

import java.io.File;

import java.io.FileReader;

import java.io.IOException;

import java.lang.reflect.Field;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.security.GeneralSecurityException;

import java.util.List;

public class UsbReceiver extends BroadcastReceiver {

private static Boolean isBootComplete = false;

private Handler handler=new Handler(){

@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

}

};

private static File RECOVERY_DIR = new File("/cache/recovery");

private static File UPDATE_FLAG_FILE = new File(RECOVERY_DIR, "last_flag");

private final String SUCCESS="success";

private final String FAILED="fail";

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

Log.i("gyx", "UsbReceiver action=" + action);

Log.i("gyx","isBootComplete="+isBootComplete);

if (action.equals("android.intent.action.BOOT_COMPLETED")) {

setProperty("persist.rpfileupdate.enable","1");

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

e.printStackTrace();

}

int start_ota_upgrade = Settings.System.getInt(context.getContentResolver(), "start_ota_upgrade", 0);

Log.i("gyx","start_ota_upgrade="+start_ota_upgrade);

String command = readFlagCommand();

if(start_ota_upgrade==1){

Settings.System.putInt(context.getContentResolver(),"start_ota_upgrade",0);

if(command!=null ){

if (command.startsWith("success")) {

Log.i("gyx","update success");

} else if (command.startsWith("updating")) {

Log.i("gyx","update failed");

}

}else {

Log.i("gyx","command =null update failed");

}

setProperty("persist.rpfileupdate.enable","0");

isBootComplete = true;

}else if (action.equals("android.intent.action.MEDIA_MOUNTED") && isBootComplete) {

String sdCardPath = getSdCardPath(context);

String path = FindFileOnUSB("update.zip");

if (path.equals("")) {

Log.i("gyx","update.zip not found");

} else {

Log.i("gyx","update system");

systemUpdate(context, sdCardPath + "/update.zip");

}

public static void setProperty(String key, String value) {

try {

Class> c = Class.forName("android.os.SystemProperties");

Method set = c.getMethod("set", String.class, String.class);

set.invoke(c, key, value);

} catch (Exception e) {

e.printStackTrace();

}

public String getSdCardPath(Context context) {

int TYPE_PUBLIC = 0;

File file = null;

String path = null;

StorageManager mStorageManager = context.getSystemService(StorageManager.class);

Class> mVolumeInfo = null;

try {

mVolumeInfo = Class.forName("android.os.storage.VolumeInfo");

Method getVolumes = mStorageManager.getClass().getMethod(

"getVolumes");

Method volType = mVolumeInfo.getMethod("getType");

Method isMount = mVolumeInfo.getMethod("isMountedReadable");

Method getPath = mVolumeInfo.getMethod("getPath");

Field internalPath = mVolumeInfo.getDeclaredField("internalPath");

List mListVolumeinfo = (List) getVolumes

.invoke(mStorageManager);

Log.d("getSdCardPath", "mListVolumeinfo.size=" + mListVolumeinfo.size());

for (int i = 0; i < mListVolumeinfo.size(); i++) {

int mType = (Integer) volType.invoke(mListVolumeinfo.get(i));

Log.d("getSdCardPath", "mType=" + mType);

if (mType == TYPE_PUBLIC) {

boolean misMount = (Boolean) isMount.invoke(mListVolumeinfo.get(i));

Log.d("getSdCardPath", "misMount=" + misMount);

if (misMount) {

file = (File) getPath.invoke(mListVolumeinfo.get(i));

if (file != null) {

// path = file.getAbsolutePath();

path = (String) internalPath.get(mListVolumeinfo.get(i));

Log.d("getSdCardPath", "path=" + path);

return path;

}

} catch (ClassNotFoundException e) {