FROM --platform=linux/amd64 alpine:latest as build

ARG GIT_REPO
ARG BRANCH

RUN <<EOF
    apk add git gcc g++ make linux-headers
    git clone --single-branch --branch="${BRANCH}" "${GIT_REPO}" /tmp/mergerfs
    cd /tmp/mergerfs
    make NDEBUG=1 LTO=1 STATIC=1 DESTDIR=/tmp/install -j$(nproc) install
    tar cvfz /tmp/mergerfs.tgz --directory=/tmp/install usr sbin
EOF

FROM --platform=linux/amd64 alpine:latest
RUN --mount=from=build,source=/tmp/mergerfs.tgz,target=/tmp/mergerfs.tgz <<EOF
    tar xvf /tmp/mergerfs.tgz -C /
EOF
ENTRYPOINT ["/usr/local/bin/mergerfs"]
CMD ["--help"]