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How to use _create_disk_img method in autotest

Best Python code snippet using autotest_python

partition.py

Source:partition.py

...665            e_msg = 'Unable to create virtual partition: %s' % e666            raise error.AutotestError(e_msg)667        logging.debug('Creating virtual partition')668        self.size = file_size669        self.img = self._create_disk_img(file_img)670        self.loop = self._attach_img_loop()671        self.device = self.loop672        logging.debug('Virtual partition successfuly created')673        logging.debug('Image disk: %s', self.img)674        logging.debug('Loopback device: %s', self.loop)675        logging.debug('Device path: %s', self.device)676    def destroy(self):677        """678        Removes the virtual partition from /dev/mapper, detaches the image file679        from the loopback device and removes the image file.680        """681        logging.debug('Removing virtual partition - device %s', self.device)682        self._detach_img_loop()683        self._remove_disk_img()684    def _create_disk_img(self, img_path):685        """686        Creates a disk image using dd.687        @param img_path: Path to the desired image file.688        @param size: Size of the desired image in MB.689        @returns: Path of the image created.690        """691        logging.debug('Creating disk image %s, size = %d MB',692                      img_path, self.size)693        try:694            cmd = 'truncate %s --size %dM' % (img_path, self.size)695            utils.run(cmd)696        except error.CmdError, e:697            e_msg = 'Error creating disk image %s: %s' % (img_path, e)698            raise error.AutotestError(e_msg)...

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