Mount image data containing multiple partitions

Sample to mount image data containing multiple partitions and check the contents

Here is an example of mounting the second partition of image data containing two partitions and checking the contents.


#!/bin/sh -e

#File name of the image file
FILENAME=$1

#Mount point
MOUNT_POINT=$2

#Associates the image specified by the argument with the loopback device. The loopback device name is the variable LOOPBACK_Assign to DEVICE.
LOOPBACK_DEVICE=$(sudo losetup -P --show -f ${FILENAME})

#Display the loopback device list
sudo  losetup -l

#The liver when mounting image data containing multiple partitions
#When you mount image data containing multiple partitions on a loopback device
#Partition 1/dev/loopXXXp1
#Partition 2/dev/loopXXXp2
#A device with the suffix p number is created.
LOOPBACK_DEVICE_P2=${LOOPBACK_DEVICE}p2

#Display a list of loopback device names corresponding to each partition of the assigned image file.
sudo ls -l ${LOOPBACK_DEVICE}*

#Mount the assigned loopback device
sudo mount ${LOOPBACK_DEVICE_P2} ${MOUNT_POINT}

#Check the contents of the mounted file system
#Can be rewritten as needed
sudo ls -l ${MOUNT_POINT}

#Unmount.
sudo umount ${MOUNT_POINT}

#Release the loopback device.
sudo losetup -d ${LOOPBACK_DEVICE}

https://gist.github.com/m-tmatma/d6ef575fcf1a2c5aed5a10e439bc7f12

Commentary

Associating image files with loopback devices with losetup

losetup -f Associates the image file specified by the command with the loopback device.

Scan the partition table with -P.
Shows the loopback device associated with --show.

Run the following command to associate an image in the image file path with a loopback device and display its device name.

sudo losetup -P --show -f image file path

For example, if you associate it with / dev / loop10, partition 1 of this image will be associated with / dev / loop10p1 and partition 2 will be associated with / dev / loop10p2.

The first script refers to partition 2 with / dev / loop10p2 by doing $ {LOOPBACK_DEVICE} p2.

Enumeration of loopback devices

Execute the following command to enumerate and display information on all loopback devices.

sudo  losetup -l

Mount the image file associated with the loopback device.

sudo mount ${LOOPBACK_DEVICE_P2} ${MOUNT_POINT}

$ {MOUNT_POINT} specifies the mount point given as an argument. Here, it is / mnt / test.

The above command is as follows.

sudo mount /dev/loop10p2 /mnt/test

This allows partition 2 of the image specified as the image file to be referenced in / mnt / test.