mkobsidianerofs is an alternative to mkobsidiansfs, mainly used with Project Pillar (i.e. ObsidianOS Atomic).
Configuration is pretty much exactly the same as mkobsidiansfs, except that it adds PILLAR_MIRROR which is the signature URL for Pillar, located in /etc/is-pillar, is used for the Arch mirrors, and is used with obsidianctl's Netupdate feature.
Basically the same license as mkobsidiansfs, the MIT License