ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.16.2-alpine3.13@sha256:4aee936562c29840e20ddb14bdbe028f7a7f376f2932096f5bfcc1931ec9f7c1 AS builder-amd64
FROM arm32v7/golang:1.16.2-alpine3.13@sha256:b1d11ae3a57e214620430094f54b37b07d76a7227771a53ea21270902a2f2f21 AS builder-arm
FROM arm64v8/golang:1.16.2-alpine3.13@sha256:8cab145c26bb1d6e0369c53c0c8def3781c218ab7099a879262fd9b5e4ed9197 AS builder-arm64
FROM builder-${ARCH} AS builder

ENV MORTY_VERSION="f9abaeba78f4156cc1a5f739ca679dd6d1e85332"

WORKDIR $GOPATH/src/github.com/asciimoo/morty

RUN apk upgrade --no-cache && \
    apk add --no-cache git="2.30.2-r0" && \
    git clone https://github.com/asciimoo/morty.git . && \
    git checkout "${MORTY_VERSION}"

RUN go get -d -v && gofmt -l ./ && go build .

# STEP 2 build the image including only the binary
FROM amd64/alpine:3.13.3@sha256:4266485e304a825d82c375d3584121b53c802e3540d6b520b212a9f0784d56f5 AS base-amd64
FROM arm32v7/alpine:3.13.3@sha256:20e384223963ef2fd24ec9341eaad4c796673da0e848387e6fe53ee2ec118d0e AS base-arm
FROM arm64v8/alpine:3.13.3@sha256:31605c2bc05b020943d5c20a108f4bfe1af47e0a818e94411041805d1374ab42 AS base-arm64
FROM base-${ARCH}

RUN apk upgrade --no-cache && \
    apk --no-cache add ca-certificates="20191127-r5" && \
    rm -f /var/cache/apk/* && \
    adduser -D -h /usr/local/morty -s /bin/false morty morty

COPY --from=builder /go/src/github.com/asciimoo/morty/morty /usr/local/morty/morty

EXPOSE 3000
USER morty

ENTRYPOINT ["/usr/local/morty/morty"]