ARG REPO=library
FROM golang:1.12-alpine AS builder

RUN apk add --no-cache git

RUN mkdir /app
WORKDIR /app

COPY ./go.mod ./go.sum /app/
RUN go mod download

COPY ./*.go /app/

ARG ARCH=amd64
ARG VERSION=dev
ENV CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH}
RUN go build -ldflags "-X main.version=${VERSION}" -a -installsuffix nocgo -o minitor .

FROM ${REPO}/busybox:latest
WORKDIR /root/
COPY --from=builder /app/minitor .

ENTRYPOINT [ "./minitor" ]