postgres-exporter.scratch.Dockerfile

# docker build --no-cache --progress=plain --build-arg VERSION=v0.15.0 -t tobi312/tools:postgres-exporter -f postgres-exporter.scratch.Dockerfile .
FROM alpine:latest as builder

ARG VERSION
# v0.15.0
ARG OS="linux"
#ARG ARCH="amd64"

RUN \
    ARCH=`uname -m` ; \
    echo "ARCH=$ARCH" ; \
    if [ "$ARCH" == "x86_64" ]; then \
        ARCH="amd64"; \
    elif [ "$ARCH" == "aarch64" ]; then \
        ARCH="arm64"; \
    elif [ "$ARCH" == "armv7l" ]; then \
        ARCH="armv7"; \
    elif [ "$ARCH" == "armv6l" ]; then \
        ARCH="armv6"; \
    else \
        echo "unknown arch" && \
        exit 1; \
    fi ; \ 
    echo "ARCH=$ARCH" ; \
    \
    VERSION=${VERSION:-$(wget -qO- https://api.github.com/repos/prometheus-community/postgres_exporter/releases/latest | grep 'tag_name' | cut -d\" -f4 | head -1)} ; \
    echo "VERSION=${VERSION}" ; \
    wget -qO- https://github.com/prometheus-community/postgres_exporter/releases/download/${VERSION}/postgres_exporter-${VERSION:1}.${OS}-${ARCH}.tar.gz | tar xvz -C /tmp ; \
    mv /tmp/postgres_exporter-${VERSION:1}.${OS}-${ARCH} /tmp/postgres_exporter ;\
    chmod +x /tmp/postgres_exporter/postgres_exporter ; \
    ls -lah /tmp/postgres_exporter

FROM scratch

ARG VERSION
ARG VCS_REF
ARG BUILD_DATE

LABEL org.opencontainers.image.title="Prometheus PostgreSQL Exporter" \
      org.opencontainers.image.authors="Prometheus Community" \
      org.opencontainers.image.version="${VERSION}" \
      org.opencontainers.image.created="${BUILD_DATE}" \
      org.opencontainers.image.revision="${VCS_REF}" \
      org.opencontainers.image.description="Metrics for PostgreSQL Database" \
      org.opencontainers.image.documentation="https://github.com/prometheus-community/postgres_exporter" \
      org.opencontainers.image.base.name="scratch" \
      org.opencontainers.image.licenses="Apache-2.0" \
      org.opencontainers.image.url="https://github.com/Tob1as/docker-tools" \
      org.opencontainers.image.source="https://github.com/prometheus-community/postgres_exporter"

COPY --from=builder --chown=100:100 /tmp/postgres_exporter/postgres_exporter /usr/local/bin/postgres_exporter

EXPOSE 9187/tcp
USER 100:100
ENTRYPOINT [ "postgres_exporter" ]
#CMD ["--help"]