#! /bin/bash
set -ex

# make sure the repo is properly setup by bootstrap-repo.sh

case "$(uname -m)" in
	aarch64|arm64)
		echo "native arm64 host detected; qemu-aarch64 binfmt is not required"
		exit 0
		;;
esac

required_binfmt="/proc/sys/fs/binfmt_misc/qemu-aarch64"

if [ ! -e "$required_binfmt" ]; then
	echo "missing qemu-aarch64 binfmt registration" >&2
	exit 1
fi

if ! grep -q '^enabled$' "$required_binfmt"; then
	echo "qemu-aarch64 binfmt is not enabled" >&2
	exit 1
fi

if ! grep -q 'flags:.*F' "$required_binfmt"; then
	echo "qemu-aarch64 binfmt lacks F flag; this builder expects systemd-binfmt with fixed interpreter" >&2
	exit 1
fi