ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.15.7-alpine3.13@sha256:18100456495c42bcdccab3411d8cfd56f3fdaa8527dd2b5a83800f96c7074a41 AS builder-amd64
FROM arm32v7/golang:1.15.7-alpine3.13@sha256:53703f1d8d6b54375840a86d27583d75f1058c03c962ef1d82d13d19605d1f1b AS builder-arm
FROM arm64v8/golang:1.15.7-alpine3.13@sha256:6e753d463df73168d815fe49861034c529d35730b5ed258866c40b9f868aabe2 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="2.26.2-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:3.13.1@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-r4" && \
    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"]