====== Mount Partitions in Disk Image ======

  * [[#losetup_partscan]]: If you have util-linux v2.21 or higher (for example, Ubuntu 16.04).
  * [[#partprobe]]: If you have a recent kernel, and pass loop.max_part=63 on boot (if loop is built-in) or to modprobe (if loop is a module).
  * [[#kpartx]]: ''apt install kpartx''
  * [[#losetup_offsetsizelimit]]: AlwaysWorks™

===== losetup partscan =====
If you have util-linux v2.21 or higher, you can now do this with losetup. Use the -P (--partscan) option to read the partition table and create device nodes for each partition.

  * http://stackoverflow.com/a/15200862
==== Mounting ====
  - Mount image as loop device<code>
# losetup -P /dev/loop0 rpool.img
</code>
  - Finish<code>
# ls /dev/loop0* -l
brw-rw---- 1 root disk   7, 0 Mar 26 13:36 /dev/loop0
brw-rw---- 1 root disk 259, 2 Mar 26 13:36 /dev/loop0p1
brw-rw---- 1 root disk 259, 3 Mar 26 13:36 /dev/loop0p9
</code>

==== Unmounting ====

  - Unload loop device<code>
# losetup -d /dev/loop0
</code>

===== partprobe =====
If you have a recent kernel, and pass loop.max_part=63 on boot (if loop is built-in) or to modprobe (if loop is a module).

  * https://superuser.com/a/345476
==== Mounting ====
  - Mount image as loop device<code>
# losetup /dev/loop0 rpool.img
</code>
  - Run partprobe<code>
# partprobe /dev/loop0
</code>
  - Finish<code>
# ls /dev/loop0* -l
brw-rw---- 1 root disk   7, 0 Mar 26 13:23 /dev/loop0
brw-rw---- 1 root disk 259, 0 Mar 26 13:23 /dev/loop0p1
brw-rw---- 1 root disk 259, 1 Mar 26 13:23 /dev/loop0p9
</code>

==== Unmounting ====

  - Unload loop device<code>
# losetup -d /dev/loop0
</code>

===== kpartx =====
  * https://nfolamp.wordpress.com/2010/08/16/mounting-raw-image-files-and-kpartx/
==== Mounting ====

  - Mount image as loop device<code>
# losetup /dev/loop0 rpool.img
</code>
  - List partitions in loop<code>
# kpartx -l /dev/loop0
loop0p1 : 0 44019712 /dev/loop0 2048
loop0p9 : 0 16384 /dev/loop0 44021760
</code>
  - Create device mappings of partitions<code>
# kpartx -av /dev/loop0
add map loop0p1 (252:0): 0 44019712 linear 7:0 2048
add map loop0p9 (252:1): 0 16384 linear 7:0 44021760
</code>
  - Finish<code>
# ls /dev/mapper/loop0* -l
lrwxrwxrwx 1 root root       7 Mar 26 13:16 loop0p1 -> ../dm-0
lrwxrwxrwx 1 root root       7 Mar 26 13:16 loop0p9 -> ../dm-1
</code>

==== Unmounting ====

  - Disconnect the device map files using kpartx<code>
# kpartx -dv /dev/loop0
del devmap : loop0p9
del devmap : loop0p1
</code>
  - Unload loop device<code>
# losetup -d /dev/loop0
</code>

===== losetup offset / sizelimit =====
  * https://www.suse.com/communities/blog/accessing-file-systems-disk-block-image-files/
==== Mounting ====

  - Get partition details<code>
# fdisk -l rpool.img
Disk rpool.img: 21 GiB, 22548578304 bytes, 44040192 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: B37248EB-F1D7-DA47-A42D-4C42AF20D328

Device        Start      End  Sectors Size Type
rpool.img1     2048 44021759 44019712  21G Solaris /usr & Apple ZFS
rpool.img9 44021760 44038143    16384   8M Solaris reserved 1
</code>
  - Setup loop device<code bash>
# losetup /dev/loop0 rpool.img --offset $((512 * 2048)) --sizelimit $((512 * 44019712))
</code>
==== Unmounting ====

  - Unload loop device<code>
# losetup -d /dev/loop0
</code>

{{tag>disk-image loop kpartx partprobe}}