A Kata Containers disk image is generated using the image_builder.sh script.
This uses a rootfs directory created by the rootfs-builder/rootfs.sh script.
To create a guest OS image run:
$ sudo ./image_builder.sh path/to/rootfs
Where path/to/rootfs is the directory populated by rootfs.sh.
Note: If you are building an image from an Alpine rootfs, see the important note here.
For more information about usage (including how to adjust the size of the image), run:
$ ./image_builder.sh -h