function add_host_dependencies__cleanup_space_final_image_zerofree() {
	declare -g EXTRA_BUILD_DEPS="${EXTRA_BUILD_DEPS} zerofree"
}

function post_customize_image__998_cleanup_apt_stuff() {
	# This used to clean apt caches, but no longer; we do that in the core now.

	declare -a too_big_firmware=("netronome" "mrv" "mellanox") # maybe: "amdgpu" "radeon" but I have an AMD GPU; qed and qcom: for x13s qcom
	for big_firm in "${too_big_firmware[@]}"; do
		local firm_dir="${SDCARD}/usr/lib/firmware/${big_firm}"
		if [[ -d "${firm_dir}" ]]; then
			display_alert "Cleaning too-big firmware" "${big_firm}" "info"
			rm -rf "${firm_dir}"
		fi
	done
}

# Zerofree the image early after umounting it
function post_umount_final_image__200_zerofree() {
	display_alert "Zerofreeing image" "${EXTENSION}" "info"
	for partDev in "${LOOP}"p?; do
		local partType
		partType="$(file -s "${partDev}" | awk -F ': ' '{print $2}')"
		if [[ "${partType}" == *"ext4"* ]]; then
			display_alert "Zerofreeing ext4 partition ${partDev}" "${EXTENSION}" "info"
			run_host_command_logged zerofree "${partDev}"
		else
			display_alert "Skipping zerofreeing partition ${partDev} of type '${partType}'" "${EXTENSION}" "info"
		fi
	done
}

function pre_umount_final_image__999_show_space_usage() {
	display_alert "Calculating used space in image" "${EXTENSION}" "info"
	run_host_command_logged "cd ${MOUNT} && " du -h -d 4 -x "." "| sort -h | tail -20"
}