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How to use _detach_img_loop method in autotest

Best Python code snippet using autotest_python

partition.py

Source:partition.py

...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)699        return img_path700    def _attach_img_loop(self):701        """702        Attaches a file image to a loopback device using losetup.703        @returns: Path of the loopback device associated.704        """705        logging.debug('Attaching image %s to a loop device', self.img)706        try:707            cmd = 'losetup -f'708            loop_path = utils.system_output(cmd)709            cmd = 'losetup -f %s' % self.img710            utils.run(cmd)711        except error.CmdError, e:712            e_msg = ('Error attaching image %s to a loop device: %s' %713                     (self.img, e))714            raise error.AutotestError(e_msg)715        return loop_path716    def _detach_img_loop(self):717        """718        Detaches the image file from the loopback device.719        """720        logging.debug('Detaching image %s from loop device %s', self.img,721                      self.loop)722        try:723            cmd = 'losetup -d %s' % self.loop724            utils.run(cmd)725        except error.CmdError, e:726            e_msg = ('Error detaching image %s from loop device %s: %s' %727                    (self.img, self.loop, e))728            raise error.AutotestError(e_msg)729    def _remove_disk_img(self):730        """...

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