FROM scratch AS base
ENV VERSION=2.72
ENV SRC_HASH=ba885c1319578d6c94d46e9b0dceb4014caafe2490e437a0dbca3f270a223f5a
ENV SRC_FILE=autoconf-${VERSION}.tar.xz
ENV SRC_SITE=https://ftp.gnu.org/gnu/autoconf/${SRC_FILE}

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

FROM fetch AS build
COPY --from=stagex/busybox . /
COPY --from=stagex/gcc . /
COPY --from=stagex/binutils . /
COPY --from=stagex/make . /
COPY --from=stagex/musl . /
COPY --from=stagex/m4 . /
COPY --from=stagex/perl . /
RUN tar -xf ${SRC_FILE}
WORKDIR /autoconf-${VERSION}
ENV M4=/usr/bin/m4
RUN --network=none <<-EOF
	set -eux
	./configure \
		--prefix=/usr
	make -j "$(nproc)"
EOF

FROM build AS install
RUN --network=none make DESTDIR=/rootfs install

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