FROM scratch as base
ENV SRC_VERSION=1.16.5
ENV SRC_HASH=f01d58cd6d9d77fbdca9eb4bbd5ead1988228fdb73d6f7a201f5f8d6b118b469
ENV SRC_FILE=automake-${SRC_VERSION}.tar.xz
ENV SRC_SITE=https://ftp.gnu.org/gnu/automake/${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=m4 . /
COPY --from=autoconf . /
RUN tar -xf automake-${SRC_VERSION}.tar.xz
WORKDIR automake-${SRC_VERSION}
RUN --network=none <<-EOF
	set -eux
	./configure --prefix=/usr
	make
EOF

FROM build as install
RUN make DESTDIR=/rootfs install
RUN find /rootfs -exec touch -hcd "@0" "{}" +

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