# Container build for fakedev-exporter + fakedev-workload
#
# test phase may require using "--build-arg=http_proxy=..." for package install

# common variables
ARG USER=65534
ARG BUILD_DIR=/build


ARG GOVERSION=1.21


# *** build stage ***
FROM golang:${GOVERSION} AS builder

ARG BUILD_DIR
# golang image sets both GOPATH & WORKDIR to /go/, but
# "go mod tidy" complains if that's the case, so change it
WORKDIR $BUILD_DIR

# to get correct branch/commit info to binary
COPY .git/ ./.git

COPY Makefile go.* ./
COPY cmd/ ./cmd

# static checker
RUN go vet ./...

RUN make race static  && \
    strip -s fakedev-exporter fakedev-workload


# *** test stage ***
FROM ubuntu:22.04

# tools used in testing: make, wget, killall, diff
ENV DEBIAN_FRONTEND=noninteractive
RUN apt-get update && \
    apt-get -y install --no-install-recommends make wget psmisc diffutils

# import
ARG USER
ARG BUILD_DIR

# make needs to be in same dir with binaries etc
# and that dir needs to be writable by wget
WORKDIR /tmp
RUN chown ${USER} .

# versions of the binaries with Golang test tooling
COPY --from=builder \
  ${BUILD_DIR}/fakedev-exporter-race \
  ${BUILD_DIR}/fakedev-workload \
  ${BUILD_DIR}/invalid-workload \
  ./

# other files + scripts for testing
COPY deployments/ ./deployments
COPY configs/ ./configs
COPY Makefile test-*.sh ./

USER ${USER}

# fail build if tests fail
RUN make test-race


# *** final stage ***
FROM scratch

# import
ARG USER
ARG BUILD_DIR

# add binary
COPY --from=builder \
  ${BUILD_DIR}/fakedev-exporter \
  ${BUILD_DIR}/fakedev-workload \
  /

# add config files + license
COPY configs/ /
COPY LICENSE /

USER ${USER}

CMD ["/fakedev-exporter", "-help"]