#!/bin/bash

if mount | grep -q "on / type aufs"; then
    cat <<EOF >&2
WARNING: Generation of wic images will fail!

Your docker host setup uses broken aufs as storage driver. Adjust the docker
configuration to use a driver (overlay, overlay2, devicemapper). You may also
need to update the host distribution (e.g. Debian Jessie -> Stretch).

EOF
fi

USER_ID=${USER_ID:-30000}

# Create a non-root user that will perform the actual build
id builder 2>/dev/null || \
    useradd --uid $USER_ID --create-home --home-dir /builder builder

cd /builder
if [ -n "$1" ]; then
	exec gosu builder "$@"
else
	exec gosu builder bash
fi