# ============================================================
# Patroni + PostgreSQL 16 – Alpine
# HA PostgreSQL cluster managed by Patroni
# DCS: etcd v3
# ============================================================

ARG POSTGRES_VERSION=16

FROM postgres:${POSTGRES_VERSION}-alpine

LABEL org.opencontainers.image.title="patroni-postgres" \
      org.opencontainers.image.description="PostgreSQL 16 with Patroni HA (etcd DCS)"

# Patroni runtime: Python 3, pip, su-exec (privilege drop), curl (healthchecks)
RUN apk add --no-cache \
      python3 \
      py3-pip \
      su-exec \
      bash \
      curl \
  && pip install --no-cache-dir --break-system-packages \
      "patroni[etcd3,psycopg3]"

# Bake in base Patroni configuration
# Node-specific values overridden via PATRONI_* env vars at runtime
COPY patroni.yml /etc/patroni/patroni.yml
COPY patroni-entrypoint.sh /patroni-entrypoint.sh
RUN chmod +x /patroni-entrypoint.sh

# Patroni manages postgres lifecycle; data dir is a volume
VOLUME ["/var/lib/postgresql/data"]

ENTRYPOINT ["/patroni-entrypoint.sh"]
CMD ["patroni", "/etc/patroni/patroni.yml"]