FROM golang:1.17.2-alpine3.14 as builder

RUN apk update && apk add --no-cache git tzdata

WORKDIR /src
COPY go.mod go.sum /src/
RUN go mod download
COPY . .
RUN VERSION=$(git describe --tags) BUILD=$(git rev-parse --short HEAD) && \
        GOOS=linux GOARCH=amd64 \
        go build -ldflags "-X main.Version=${VERSION} -X main.Build=${BUILD} -w" \
        -o /go/bin/myip cmd/myip/main.go

FROM alpine:3.14

EXPOSE 5080
ENV PATH="/go/bin:${PATH}"

COPY --from=builder /usr/share/zoneinfo /usr/share/zoneinfo
COPY --from=builder /go/bin/myip /go/bin/myip
CMD ["/go/bin/myip","serve","-f","/var/log/myip.log"]

# use cmd instead for flexibility
# ENTRYPOINT ["/go/bin/myip","serve"]