FROM scratch AS base
ENV VERSION=2.0.3
ENV SRC_HASH=7ca3a04bb4ab83387538235decc42a535097a05d2fb9f2266d0c47b33119501f
ENV SRC_FILE=v${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/cpuguy83/go-md2man/archive/${SRC_FILE}

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

FROM fetch AS build
COPY --from=stagex/busybox . /
COPY --from=stagex/go . /
COPY --from=stagex/ca-certificates . /
RUN tar -xvf ${SRC_FILE}
WORKDIR go-md2man-${VERSION}
ENV PWD=/home/user/go-md2man-${VERSION}
ENV GOPATH=${PWD}/cache/go
ENV GOCACHE=${PWD}/cache/
ENV GOWORK=off
ENV GOPROXY=https://proxy.golang.org,direct
ENV GOSUMDB=sum.golang.org
ENV CGO_ENABLED=0
ENV GOHOSTOS=linux
ENV GOHOSTARCH=amd64
RUN mkdir -p ${GOPATH}
RUN go build -o bin/go-md2man 

from build as install
RUN <<-EOF
    mkdir -p /rootfs/usr/bin/
    cp bin/go-md2man /rootfs/usr/bin/
EOF

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