FROM golang:1.19.3-bullseye AS cacher

ENV GOPATH /go
ENV DEBIAN_FRONTEND noninteractive
RUN --mount=type=cache,target=/var/cache/apt \
    apt update && apt install -y make zstd curl unzip
RUN mkdir -p /build
WORKDIR /build

# install newer protoc
RUN wget https://github.com/protocolbuffers/protobuf/releases/download/v21.10/protoc-21.10-linux-aarch_64.zip && \
    unzip *.zip -d /usr/local && rm -v *.zip && protoc --version

RUN go install -v google.golang.org/protobuf/cmd/protoc-gen-go@v1.28.1

COPY ./go.mod .
COPY ./go.sum .

RUN --mount=type=cache,target=/go/pkg go mod download -x
RUN go env
## build image
FROM golang:1.19.3-bullseye AS builder

COPY --from=cacher /usr/local /usr/local
COPY --from=cacher /usr/bin /usr/bin
COPY --from=cacher /go/bin /go/bin
COPY --from=cacher /build /build

WORKDIR /build

COPY ./ ./
RUN --mount=type=cache,target=/go/pkg go mod download -x && go mod tidy && cd mfer && go generate .
RUN --mount=type=cache,target=/go/pkg make mfer.cmd && go mod vendor
RUN tar -c . | zstdmt -19 > /src.tzst

## lint image
FROM golangci/golangci-lint:v1.50.1 AS linter

COPY --from=cacher /build /build
WORKDIR /build
RUN golangci-lint run

FROM scratch
COPY --from=builder /src.tzst /src.tzst
COPY --from=builder /build/mfer.cmd /mfer
ENTRYPOINT ["/mfer"]