Mounting bootable image file under linux with offset

Use fdisk to see the partitions and their offset of the image file:

# fdisk -l router-devuan-jessie-diskless-2017.img
Disk router-devuan-jessie-diskless-2017.img: 3.7 GiB, 3980394496 bytes, 7774208 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: dos
Disk identifier: 0x7b19da02

Device                                                 Boot Start     End Sectors  Size Id Type
router-devuan-jessie-diskless-2017.img    *     2048 7772159 7770112  3.7G 83 Linux

According to fdisk each sector of the image has 512 bytes. We need that so we can calculate the right offset when mounting it.

The image has one linux partition starting at offset of 2048. The right offset is 512*2048.

Here is how to mount it:

# mount -o loop,offset=$((2048*512)) router-devuan-jessie-diskless-2017.img /mnt/

Debian GNU/Linux mounting Novell NetWare volumes

This is example of mounting Novell NetWare 5.1 partitions with Debian GNU/Linux (in this case - unstable with kernel 3.2.0).

First we need ncpfs package.

# apt-get install ncpfs

Then we need ncpfs module in kernel (it comes with debian kernel).

# modprobe ncpfs

Novell Context is support.gabrovo.hq
Username is niki
Server IP address is 10.1.42.24
Volume to mount is called - data

# ncpmount -o tcp -S 10.1.42.24 -A 10.1.42.24 -U niki.support.gabrovo.hq -V data /mnt/
Logging into 10.1.42.24 as NIKI.SUPPORT.GABROVO.HQ
Password:
# ls -la /mnt/
total 5
drwxr-xr-x  1 root root  512 Jan  1  1986 .
drwxr-xr-x 24 root root 4096 Mar  7 14:12 ..
dr-xr-xr-x  1 root root  512 Mar 12 13:57 MAN

# df -h
Filesystem                                              Size  Used Avail Use% Mounted on
rootfs                                                  389G   23G  362G   6% /
udev                                                     10M     0   10M   0% /dev
tmpfs                                                   596M  848K  595M   1% /run
/dev/disk/by-uuid/2e00092b-1986-4e86-9887-996ff2949e05  389G  23G  362G   6% /
tmpfs                                                   5.0M     0  5.0M   0% /run/lock
tmpfs                                                   3.4G  172K  3.4G   1% /run/shm
10.1.42.24/NIKI.SUPPORT.GABROVO.HQ                               137G 132G  4.9G  97% /mnt

Mount options and what they mean as follow:
-o tcp - use tcp (or -o udp)
-S 10.1.42.24 - server name/ip address.
-A 10.1.42.24 - which server to ask for name addresses.
-U niki.support.gabrovo.hq - niki is the user name and support.gabrovo.hq is context tree.
-V data - name of the volume to mount - "data".

If you did something wrong when mounting you can clear all your connections to novell with the following command:

# ncplogout -a