/etc/systemd/system/usr.mount
/etc/systemd/system/var-lib-overlays-usr.mount
/etc/systemd/system/steamos-rw.target
/etc/systemd/system/overlay-units.service
/etc/systemd/user/overlay-units.service
/etc/atomic-update.conf.d/steamos-rw.conf
/etc/pacman.conf
/etc/pacman.d