FROM alpine as build

ARG VERSION
ENV ALPINE_SERIES 3.10
ENV ALPINE_MIRROR https://uk.alpinelinux.org/alpine/v${ALPINE_SERIES}
ENV ALPINE_ARCH x86_64

WORKDIR /root
RUN set -x; apk add --no-cache curl &&\
  curl -LO ${ALPINE_MIRROR}/releases/${ALPINE_ARCH}/alpine-minirootfs-${VERSION}-${ALPINE_ARCH}.tar.gz &&\
  mkdir /dest &&\
  tar -C /dest -xvzf alpine-minirootfs-${VERSION}-${ALPINE_ARCH}.tar.gz &&\
  sed -i "s#http://dl-cdn.alpinelinux.org/alpine/v${ALPINE_SERIES}#${ALPINE_MIRROR}#g" /dest/etc/apk/repositories

FROM scratch
ARG VERSION
LABEL version.alpine=$VERSION
COPY --from=build /dest /
CMD ["/bin/sh"]