Code review comment for lp:~jibel/livecd-rootfs/add_multi_layered_squashfses_support

We intended to propose several MP for snap and “sub-layers” to reduce the complexity of the review, but we’ll finally merge them into this one so you’ll have a good understanding of the full implementation.

Supporting the server-live use case adds makes the implementation more complex due to its specific requirements (hooks and includes). But we agree that a more generalizable implementation is better, so let’s spend some time to ensure those 2 additional requirements are supported, and once foundation/server team want to switch to it, that they will not encounter any major limitations.