FROM scratch AS base
ENV VERSION=1.63.2
ENV SRC_HASH=ffc7611e4989de79de4c17b015ff10db810b85f749b12520336314746e9d7095
ENV SRC_FILE=v${VERSION}.tar.gz
ENV SRC_SITE=https://github.com/grpc/grpc-go/archive/refs/tags/${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 v${VERSION}.tar.gz
WORKDIR grpc-go-${VERSION}/cmd/protoc-gen-go-grpc
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
ENV GOFLAGS=-trimpath
RUN mkdir -p ${GOPATH}
RUN go build -o bin/protoc-gen-go-grpc ./

from build as install
RUN <<-EOF
    set -eux
    mkdir -p /rootfs/usr/bin/
    cp bin/protoc-gen-go-grpc /rootfs/usr/bin/
EOF

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