Bcachefs support

[theoparis]

I realized that in order to build an ISO with bcachefs support I need to build the ISO using nix, except I can't do that from macOS 😕
Would it be possible to include bcachefs-tools and the kernel module in the prebuilt ISO? It seems like it should be supported since Linux 6.7... However I don't see it in the kernel config file in this repository despite using the 6.9 kernel.

[theoparis]

Actually, I might be able to use the prebuilt ISO with nix shell for bcachefs-tools with an overlay that overrides fuseSupport. That way I can try using bcachefs format and bcachefs fusemount`. However it'd still be nice if btrfs/bcachefs were supported out of the box.

Edit: fusemount doesn't work, it gives filesystem errors like "fuse: bad error value: ..."

[tpwrules]

This is probably possible, I will have to check that everything cross-compiles properly. We would also have to enable the appropriate kernel config. If you have access to another Linux machine or VM it should be easy to build your own ISO with this feature.

I will consider it for next release, but no promises. Certainly no ZFS!