Shell remount Linux Read Write and Copy - Java Native OS

Java examples for Native OS:Linux

  1. HOME
  2. Java
  3. Native OS
  4. Linux

Description

Shell remount Linux Read Write and Copy

Demo Code


//package com.java2s;
import java.io.DataOutputStream;
import java.io.IOException;

public class Main {


    private final static String CMD_REMOUNT_RW = "grep \" /system \" /proc/mounts | awk '{system(\"mount -o rw,remount -t \"$3\" \"$1\" \"$2)}'";
    private final static String CMD_REMOUNT_RO = "grep \" /system \" /proc/mounts | awk '{system(\"mount -o ro,remount -t \"$3\" \"$1\" \"$2)}'";
    private final static String CMD_CHANGE_PERMS = "chmod 777";
    private final static String CMD_CHANGE_PERMS_ALL_READ = "chmod a+r";

    public static boolean remountRWandCopy(String srcPath, String targetPath)
            throws IOException {

        Process p = Runtime.getRuntime().exec("su");
        DataOutputStream os = new DataOutputStream(p.getOutputStream());

        //remote system partition read write
        os.writeBytes(CMD_REMOUNT_RW + '\n');

        //change perms on the target file for all to write
        os.writeBytes(CMD_CHANGE_PERMS + ' ' + targetPath + '\n');

        //copy the source file over the target
        os.writeBytes("cp " + srcPath + ' ' + targetPath + '\n');

        //change perms on the target file to all read only
        os.writeBytes(CMD_CHANGE_PERMS_ALL_READ + ' ' + targetPath + '\n');

        //remount file system read only
        os.writeBytes(CMD_REMOUNT_RO + '\n');

        os.writeBytes("exit\n");
        os.flush();// www. jav a  2 s. c  o  m

        return true;

    }
}

Related Tutorials