Mounting partitions within image file

kpartx is a tool which creates device maps from partition tables. Assume that you have a .img disk image which contains various partitions and you want to mount one or more of the partitions. kpartx will map each partition to a loop device under /dev/mapper and will allow you to mount the loop device to a local directory and access the files.
Mapping an image:

# kpartx -a /foo/bar/disk.img

Checking which loop device was used to mount the partitions:

# kpartx -l /foo/bar/disk.img
loop1p1 : 0 8177022 /dev/loop1 63

The disk image has one partition and is mapped to /dev/loop1p1. You can now mount the partition:

# mount /dev/mapper/loop1p1 /mnt/img

Once finished, you can remove the mapper device:

# kpartx -d /foo/bar/disk.img
loop deleted : /dev/loop1

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