FROM scratch AS base
ENV VERSION=5.2.0
ENV SRC_HASH=48554abfd530fcdaa08f23f801b699e4f74c320ddf7d0bd56b0e8c24e55fc911
ENV SRC_FILE=${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/ocaml/ocaml/archive/refs/tags/${SRC_FILE}
ENV SOURCE_DATE_EPOCH=1

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

FROM fetch AS build
COPY --from=stagex/busybox . /
COPY --from=stagex/binutils . /
COPY --from=stagex/make . /
COPY --from=stagex/musl . /
COPY --from=stagex/gcc . /
COPY --from=stagex/libzstd . /
RUN tar -xf ${SRC_FILE}
WORKDIR /ocaml-${VERSION}
RUN --network=none <<-EOF
	set -eux

	CFLAGS="-fPIC" \
	./configure \
		--prefix=/usr \
		--sysconfdir=/etc \
		--mandir=/usr/share/man \
		--infodir=/usr/share/info \
		--localstatedir=/var
	make -j "$(nproc)"
EOF

FROM build AS install
RUN --network=none <<-EOF
	set -eux

	make install DESTDIR=/rootfs
EOF

FROM stagex/filesystem AS package
COPY --from=install /rootfs/. /