WORK IN PROGRESS!

hassio-os

Hass.io OS based on buildroot

building

Running sudo ./enter.sh will get you into the build docker container.
make -C /build/buildroot BR2_EXTERNAL=/build/buildroot-external xy_defconfig

From outside the docker container, while it is still running you can use ./getimage.sh to get the output image.

edit

make -C /build/buildroot BR2_EXTERNAL=/build/buildroot-external defconfig BR2_DEFCONFIG=/build/buildroot-external/configs/xy_defconfig make -C /build/buildroot BR2_EXTERNAL=/build/buildroot-external savedefconfig BR2_DEFCONFIG=/build/buildroot-external/configs/xy_defconfig