[2745531656] Upstream Reporter: Jonathan Lebon
Upstream issue status: Open
Upstream description:

Currently, we ship a `rootfs.img` CPIO (both as a separate artifact and as part of the live ISO) which contains the rootfs as a squashfs image.

Let's switch it over to use EROFS instead. Since EROFS is already in use by composefs, this reduces the number of read-only filesystem image formats we have to care about. RHEL 10 is planning to use EROFS for all its live media, and RHCOS is no exception. So a primary motivation here is to have FCOS and RHCOS aligned to do things in upstream first and reduce the maintenance burden. Though we should definitely in the process ensure that EROFS does not introduce major time or size regressions at build time or consumption time.

This work would happen in osbuild since that's where our live ISO is now being built.