# build stage
FROM golang:alpine AS build-env
RUN apk --no-cache add build-base git gcc
RUN cd /tmp; git clone https://github.com/ThomasLeister/prosody-filer.git
RUN cd /tmp/prosody-filer; \
    VERSIONSTRING="$(git describe --tags --exact-match 2> /dev/null || git rev-parse --short HEAD)"; \
    echo "Building version ${VERSIONSTRING} of Prosody-Filer ..."; \
    CGO_ENABLED=0 GOOS=linux go build -a -ldflags "-extldflags '-static' -w -s -X main.versionString=${VERSIONSTRING}" prosody-filer.go;

# final stage
FROM alpine
WORKDIR /app
COPY --from=build-env /tmp/prosody-filer/prosody-filer /app/
ENTRYPOINT /app/prosody-filer