FROM golang:1.23-bookworm as build

COPY . /src/loki
WORKDIR /src/loki
RUN apt-get update && apt-get install -qy libsystemd-dev
RUN make clean && make BUILD_IN_CONTAINER=false PROMTAIL_JOURNAL_ENABLED=true promtail

# Promtail requires debian as the base image to support systemd journal reading
FROM debian:12.8-slim
# tzdata required for the timestamp stage to work
RUN apt-get update && \
  apt-get install -qy tzdata ca-certificates wget libsystemd-dev && \
  rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
COPY --from=build /src/loki/clients/cmd/promtail/promtail /usr/bin/promtail
COPY clients/cmd/promtail/promtail-local-config.yaml /etc/promtail/local-config.yaml
COPY clients/cmd/promtail/promtail-docker-config.yaml /etc/promtail/config.yml

# Drone CI builds arm32 images using armv8l rather than armv7l. Something in
# our build process above causes ldconfig to be rerun and removes the armhf
# library that debian:stretch-slim on ARM comes with. Symbolically linking to
# ld-linux.so.3 fixes the problem and allows Promtail to start.
#
# This process isn't necessary when building on armv7l so we only do it if the
# library was removed.
RUN sh -c '[ ! -f /lib/ld-linux-armhf.so.3 ] && echo RE-LINKING LD-LINUX-ARMHF.SO.3 && ln -s /lib/ld-linux.so.3 /lib/ld-linux-armhf.so.3'

ENTRYPOINT ["/usr/bin/promtail"]
CMD ["-config.file=/etc/promtail/config.yml"]