Postgresql recipe.

+FROM debian:stretch-slim
+
+ARG POSTGRESQL_EXTRA_PACKAGES
+
+COPY files/ /tmp/files
+RUN /tmp/files/configure
+
+ENTRYPOINT ["/sbin/entrypoint"]
+CMD ["pg_ctlcluster", "9.6", "main", "start", "--foreground"]

+#!/bin/sh
+
+set -e
+
+mkdir /usr/share/man/man1 /usr/share/man/man7
+cp /tmp/files/no-suggests-recommends.conf /etc/apt/apt.conf.d/no-suggests-recommends
+apt-get update
+apt-get install -y postgresql-9.6 \
+	$POSTGRESQL_EXTRA_PACKAGES \
+	&& true
+
+rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
+
+mkdir /var/lib/container
+tar -cC /var/lib/postgresql/ . | gzip -9v > /var/lib/container/var_lib_postgresql.tar.gz
+rm -rf /var/lib/postgresql
+mkdir /var/lib/postgresql
+
+cp -a /tmp/files/entrypoint /sbin
+
+rm -rf /tmp/files

+#!/bin/bash
+
+declare -a found_errors
+
+set -ex
+
+if [[ $(find /var/lib/postgresql -maxdepth 1 -mindepth 1|wc -l) = 0 ]]; then
+	zcat /var/lib/container/var_lib_postgresql.tar.gz | tar xf - -C /var/lib/postgresql
+fi
+
+postgres_home="$(getent passwd postgres | cut -f 6 -d :)"
+
+if [[ $GID ]]; then
+	old_gid=$(getent group postgres | cut -f 3 -d :)
+	groupmod -g $GID postgres
+	find "$postgres_home" /etc/postgresql /var/run/postgresql -gid $old_gid -print0 | xargs -0r chgrp postgres
+fi
+
+if [[ $UID ]]; then
+	old_uid=$(getent passwd postgres | cut -f 3 -d :)
+	usermod -u $UID postgres
+	find /etc/postgresql /var/run/postgresql -uid $old_uid -print0 | xargs -0r chown postgres
+fi
+
+exec "$@"

+APT::Install-Suggests false;
+APT::Install-Recommends false;