How to fix 'sudo: no tty present and no askpass program'以及硬盘序列号的读写

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在调用system命令读写硬盘序列号的过程中遇到问题,报错如下:

sudo: no tty present and no askpass program

发现此问题是由于帐号并没有开启免密码导致的 。

查找资料,解决方法如下:

方法一:

sudo isudo

然后在最末尾添加:

username ALL = NOPASSWD: /fullpath/to/command,/fullpath/to/othercommand

eg:
john ALL = NOPASSWD: /sbin/poweroff,/sbin/start,sbin/stop

会允许用户John在进行poweroff,start,stop的时候不需要密码。这里我使用了最简单的方式,如下:

john ALL = NOPASSWD: ALL

添加完成以后就可以无须密码进行sudo操作了。(亲测可用

方法二:

1    打开sudoers

vi /etc/sudoers

2    添加免密码

john ALL = NOPASSWD: ALL

 

读取硬盘序列号的方法:

if(system("sudo hdparm -I /dev/sda | grep Serial >> tmpGenuine.txt")>=0)
{
        QFile *tmpFile = new QFile("tmpGenuine.txt");//临时存放文件
        if(tmpFile->open(QIODevice::ReadOnly|QIODevice::Text))
        {
            while(!tmpFile->atEnd())
            {
                QString tmpLine;
                tmpLine = tmpFile->readLine();
                tmpLine.indexOf(rx2);
                genuineNum += rx2.cap(1);
            }
            qDebug()<<"genuineNum:"<<genuineNum;
        }
        tmpFile->close();
}
else
{
       qDebug()<<"can not get the Serial Num";
       return 0;
}

 

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