FROM scratch as base
ENV VERSION=1.2.3
ENV SRC_HASH=9ffb3479b15df0170eba4480e51723c3961dbe0b461ec289744622db03a69395
ENV SRC_FILE=v${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/void-linux/musl-obstack/archive/refs/tags/${SRC_FILE}

FROM base as fetch
ADD --checksum=sha256:${SRC_HASH} ${SRC_SITE} .

FROM fetch as build
COPY --from=busybox . /
COPY --from=gcc . /
COPY --from=binutils . /
COPY --from=make . /
COPY --from=musl . /
COPY --from=perl . /
COPY --from=autoconf . /
COPY --from=automake . /
COPY --from=libtool . /
COPY --from=pkgconf . /
COPY --from=m4 . /
RUN tar -xzf ${SRC_FILE}
WORKDIR musl-obstack-${VERSION}
RUN --network=none <<-EOF
	set -eux
	./bootstrap.sh
	./configure --prefix=/usr
	make
EOF

FROM build as install
RUN --network=none make DESTDIR=/rootfs install
RUN find /rootfs -exec touch -hcd "@0" "{}" +

FROM scratch as package
COPY --from=install /rootfs /