ARG ARCH

# STEP 1 build executable binary
FROM amd64/golang:1.15.7-alpine3.12@sha256:9f88dc7df11a83b9641d71b4be4f8ccbfb2342e5cb733661363ed3d0a98fe3ef AS builder-amd64
FROM arm32v7/golang:1.15.7-alpine3.12@sha256:d54bff25a171d1b3036bf6b5dea2bbfaf75b7518e9b780a046750d8e26a19253 AS builder-arm
FROM arm64v8/golang:1.15.7-alpine3.12@sha256:e5389316a6dc295d6c0ca269c39124ad5bc9ebb416c71c810822cf6fbcf8ff01 AS builder-arm64
FROM builder-${ARCH} AS builder

ENV FILTRON_VERSION="v0.2.0"

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

RUN apk add --no-cache tar="1.32-r1" git="2.26.2-r0" curl="7.69.1-r3" \
  && curl -L "https://github.com/asciimoo/filtron/archive/${FILTRON_VERSION}.tar.gz" | tar xvz --strip 1

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

# STEP 2 build the image including only the binary
FROM amd64/alpine:3.12.3@sha256:074d3636ebda6dd446d0d00304c4454f468237fdacf08fb0eeac90bdbfa1bac7 AS base-amd64
FROM arm32v7/alpine:3.12.3@sha256:299294be8699c1b323c137f972fd0aa5eaa4b95489c213091dcf46ef39b6c810 AS base-arm
FROM arm64v8/alpine:3.12.3@sha256:549694ea68340c26d1d85c00039aa11ad835be279bfd475ff4284b705f92c24e AS base-arm64
FROM base-${ARCH}

RUN apk --no-cache add ca-certificates="20191127-r4" \
 && adduser -D -h /usr/local/filtron -s /bin/false filtron filtron

COPY --from=builder /go/src/github.com/asciimoo/filtron/example_rules.json /etc/filtron/rules.json
COPY --from=builder /go/src/github.com/asciimoo/filtron/filtron /usr/local/filtron/filtron

EXPOSE 3000
USER filtron

ENTRYPOINT ["/usr/local/filtron/filtron", "--rules", "/etc/filtron/rules.json"]