This makes throw away layers possible, or starting different setups depending on rootfs and the join.img.
Example:
the live bootloader features a base system and a desktop system entry, where the desktop fs resides in the join.img, while rootfs would be just a console base system.
throw away live layer, the installer extracts the rootfs, while live session fs resides in the join.img, including the installer itself
Continue with question #687.
Support a union join on rootfs wiih another img.
This makes throw away layers possible, or starting different setups depending on rootfs and the join.img.
Example:
Usage:
rd.live.join=$name.img