Stacking of DwarFS layers can be done in an OverlayFS manner

[ronaldtse]

The dwarfs man page shows an example for setting up DwarFS with overlayfs in order to create a writable file system mount on top a read-only DwarFS image.

[maxirmx]

DwarFS manuals are not applicable since they all relay on underling linux kernel. Technically we are not implementing a filesystem, we will have a library that works one level up.

ruby packer / squashfs implement their own custom overlay functionality. It looks like this is the only possible approach as far as we want to have patched Ruby and not a solution integrated into operationg system kernel.

[ronaldtse]

@maxirmx exactly, that's why the issue says "OverlayFS manner" instead of using "OverlayFS"; the man page was given to illustrate the concept. It would need to be a user-space library that allows overlays.