ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.15.8-alpine3.13@sha256:4087a9c93dd47e4a599066f63176538204e60fab17c8e3a55adbb11dff097ff6 AS builder-amd64
FROM arm32v7/golang:1.15.8-alpine3.13@sha256:b1f96aeaac2f2fb370c6215218165ce29a55794fec05db341404020229c630c7 AS builder-arm
FROM arm64v8/golang:1.15.8-alpine3.13@sha256:f8e2bfdb45f27aad42e8e9c2fd6ef9d37669672659ab6ac2c9dc07647dea1a6d AS builder-arm64
FROM builder-${ARCH} AS builder

ENV MORTY_VERSION="f56efbfca411605bc7a2b5cc8fcad91df537a597"

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

RUN apk upgrade --no-cache && \
    apk add --no-cache git="2.30.0-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:3.13.1@sha256:3747d4eb5e7f0825d54c8e80452f1e245e24bd715972c919d189a62da97af2ae AS base-amd64
FROM arm32v7/alpine:3.13.1@sha256:817f5bc4194eccd71ad9afe9c2eb7e73a5841180a88a385229bd38ab6daf005b AS base-arm
FROM arm64v8/alpine:3.13.1@sha256:019c59128325536e838a5f36028db214335129f9aa83214cc2c60c10dc1797ac 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"]