Qemu

Run with QEMU

• Download kernel-qemu-4.14.79-stretch and versatile-pb.dtb at dhruvvyas90/qemu-rpi-kernel .

• Download Raspbian Stretch at the official site. I use ’lite’ version, but other version should be fine.

Solution 1: losetup

With newer version of losetup, you can easy map parition in image file to /dev/loop*.

$ sudo losetup --show -Pf <imagefile>
/dev/loop0

The output will show which loop device has been mapped to image file. Now you can mount partition of it.
Example:

$ sudo mount /dev/loop0p1 /mnt