FROM scratch as base
ENV SRC_VERSION=2.9.5
ENV SRC_HASH=a4bea37ecb9a3fb5c0c8ef18c2f7eeaf8ccbcfec91f72f3bccfc6bf72a3e3902
ENV SRC_FILE=git-${SRC_VERSION}.tar.xz
ENV SRC_SITE=http://mirrors.edge.kernel.org/pub/software/scm/git/${SRC_FILE}

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

FROM fetch as build
COPY --from=busybox . /
COPY --from=musl . /
COPY --from=gcc . /
COPY --from=binutils . /
COPY --from=make . /
COPY --from=zlib . /
COPY --from=perl . /
COPY --from=gettext . / 
RUN tar -xvf $SRC_FILE
WORKDIR git-${SRC_VERSION}
RUN --network=none <<-EOF
	set -eux
	./configure \
		--build=x86_64-unknown-linux-musl \
		--host=x86_64-unknown-linux-musl \
		--prefix=/usr \
		--bindir=/bin \
		--mandir=/usr/share/man \
		--infodir=/usr/share/info \
		--disable-nls \
		--enable-readline \
		--without-curses \
		--without-bash-malloc \
		--without-tcltk
	make
EOF

FROM build as install
RUN make DESTDIR=/rootfs install

FROM base as test
COPY --from=install /rootfs /
COPY --from=zlib . /
COPY --from=musl . /
COPY --from=busybox . /
RUN /bin/sh <<-EOF
	set -eux
	EXPECTED_GIT_VERSION="git version ${SRC_VERSION}"
	GIT_VERSION=\$(git --version)
	if [ "\$GIT_VERSION" != "\$EXPECTED_GIT_VERSION" ]; then
	    echo "Expected git version is \$EXPECTED_GIT_VERSION, but got \$GIT_VERSION"
	    exit 1
	fi
EOF

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