The config/ sub directory in this repository contains the source code for the ubuntu-core-config debian package which ships the system defaults to create a bootable Ubuntu Core embedded/IoT image using the core snap package.
The initramfs/ sub directory in this repository contains the source code for the initramfs-tools-ubuntu-core debian package which ships the necessary initramfs addon scripts on top of the ubuntu initramfs-tools package to manage snaps as rootfs with writable paths defined in the ubuntu-core-config package.