The subdirectories here are recommended to be installed alongside bootc in /usr/share/doc/bootc/baseimage - they act as reference sources of content.

• base: At the current time the content here is effectively a hard requirement. It's not much, just an ostree configuration enabling composefs, plus the default sysroot directory (which may go away in the future) and the ostree symlink into sysroot.
• dracut: Default/basic dracut configuration; at the current time this basically just enables ostree in the initramfs.
• systemd: Optional configuration for systemd, currently this has configuration for kernel-install enabling rpm-ostree integration.