Create Postgresql image

optional/postgresql/Dockerfile

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+FROM alpine:3.8
+# python3 shared with most images
+RUN apk add --no-cache \
+    python3 py3-pip \
+  && pip3 install --upgrade pip
+# Shared layer between rspamd, postfix, dovecot, unbound and nginx
+RUN pip3 install jinja2
+# Image specific layers under this line
+RUN apk add --no-cache \
+    postgresql postgresql-libs \
+  && apk add --virtual .build-deps gcc musl-dev postgresql-dev python3-dev \
+  && pip3 install psycopg2 anosql \
+  && apk --purge del .build-deps
+
+COPY start.py /start.py
+COPY conf /conf
+
+ENV LANG en_US.UTF-8
+EXPOSE 5432
+
+RUN mkdir -p /run/postgresql && chown -R postgres:postgres /run/postgresql && chmod 2777 /run/postgresql
+
+CMD /start.py

optional/postgresql/conf/pg_hba.conf

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+# PostgreSQL Client Authentication Configuration File
+# ===================================================
+#
+# Refer to the "Client Authentication" section in the PostgreSQL
+# documentation for a complete description of this file.  A short
+# synopsis follows.
+#
+# This file controls: which hosts are allowed to connect, how clients
+# are authenticated, which PostgreSQL user names they can use, which
+# databases they can access.  Records take one of these forms:
+#
+# local      DATABASE  USER  METHOD  [OPTIONS]
+# host       DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
+# hostssl    DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
+# hostnossl  DATABASE  USER  ADDRESS  METHOD  [OPTIONS]
+#
+# (The uppercase items must be replaced by actual values.)
+#
+# The first field is the connection type: "local" is a Unix-domain
+# socket, "host" is either a plain or SSL-encrypted TCP/IP socket,
+# "hostssl" is an SSL-encrypted TCP/IP socket, and "hostnossl" is a
+# plain TCP/IP socket.
+#
+# DATABASE can be "all", "sameuser", "samerole", "replication", a
+# database name, or a comma-separated list thereof. The "all"
+# keyword does not match "replication". Access to replication
+# must be enabled in a separate record (see example below).
+#
+# USER can be "all", a user name, a group name prefixed with "+", or a
+# comma-separated list thereof.  In both the DATABASE and USER fields
+# you can also write a file name prefixed with "@" to include names
+# from a separate file.
+#
+# ADDRESS specifies the set of hosts the record matches.  It can be a
+# host name, or it is made up of an IP address and a CIDR mask that is
+# an integer (between 0 and 32 (IPv4) or 128 (IPv6) inclusive) that
+# specifies the number of significant bits in the mask.  A host name
+# that starts with a dot (.) matches a suffix of the actual host name.
+# Alternatively, you can write an IP address and netmask in separate
+# columns to specify the set of hosts.  Instead of a CIDR-address, you
+# can write "samehost" to match any of the server's own IP addresses,
+# or "samenet" to match any address in any subnet that the server is
+# directly connected to.
+#
+# METHOD can be "trust", "reject", "md5", "password", "scram-sha-256",
+# "gss", "sspi", "ident", "peer", "pam", "ldap", "radius" or "cert".
+# Note that "password" sends passwords in clear text; "md5" or
+# "scram-sha-256" are preferred since they send encrypted passwords.
+#
+# OPTIONS are a set of options for the authentication in the format
+# NAME=VALUE.  The available options depend on the different
+# authentication methods -- refer to the "Client Authentication"
+# section in the documentation for a list of which options are
+# available for which authentication methods.
+#
+# Database and user names containing spaces, commas, quotes and other
+# special characters must be quoted.  Quoting one of the keywords
+# "all", "sameuser", "samerole" or "replication" makes the name lose
+# its special character, and just match a database or username with
+# that name.
+#
+# This file is read on server startup and when the server receives a
+# SIGHUP signal.  If you edit the file on a running system, you have to
+# SIGHUP the server for the changes to take effect, run "pg_ctl reload",
+# or execute "SELECT pg_reload_conf()".
+#
+# Put your actual configuration here
+# ----------------------------------
+#
+# If you want to allow non-local connections, you need to add more
+# "host" records.  In that case you will also need to make PostgreSQL
+# listen on a non-local interface via the listen_addresses
+# configuration parameter, or via the -i or -h command line switches.
+
+
+
+# TYPE  DATABASE        USER            ADDRESS                 METHOD
+
+# "local" is for Unix domain socket connections only
+local   all             all                                     peer map=local
+# IPv4 connections:
+host    all             mailu           {{ SUBNET }}            md5
+host    postgres        health          127.0.0.1/32            md5
+# IPv6 local connections:
+host    all             all             ::1/128                 reject
+# Allow replication connections from localhost, by a user with the
+# replication privilege.
+local   replication     all                                     reject
+host    replication     all             127.0.0.1/32            reject
+host    replication     all             ::1/128                 reject

optional/postgresql/conf/pg_ident.conf

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+# PostgreSQL User Name Maps
+# =========================
+#
+# Refer to the PostgreSQL documentation, chapter "Client
+# Authentication" for a complete description.  A short synopsis
+# follows.
+#
+# This file controls PostgreSQL user name mapping.  It maps external
+# user names to their corresponding PostgreSQL user names.  Records
+# are of the form:
+#
+# MAPNAME  SYSTEM-USERNAME  PG-USERNAME
+#
+# (The uppercase quantities must be replaced by actual values.)
+#
+# MAPNAME is the (otherwise freely chosen) map name that was used in
+# pg_hba.conf.  SYSTEM-USERNAME is the detected user name of the
+# client.  PG-USERNAME is the requested PostgreSQL user name.  The
+# existence of a record specifies that SYSTEM-USERNAME may connect as
+# PG-USERNAME.
+#
+# If SYSTEM-USERNAME starts with a slash (/), it will be treated as a
+# regular expression.  Optionally this can contain a capture (a
+# parenthesized subexpression).  The substring matching the capture
+# will be substituted for \1 (backslash-one) if present in
+# PG-USERNAME.
+#
+# Multiple maps may be specified in this file and used by pg_hba.conf.
+#
+# No map names are defined in the default configuration.  If all
+# system user names and PostgreSQL user names are the same, you don't
+# need anything in this file.
+#
+# This file is read on server startup and when the postmaster receives
+# a SIGHUP signal.  If you edit the file on a running system, you have
+# to SIGHUP the postmaster for the changes to take effect.  You can
+# use "pg_ctl reload" to do that.
+
+# Put your actual configuration here
+# ----------------------------------
+
+# MAPNAME       SYSTEM-USERNAME         PG-USERNAME
+local           postgres                postgres
+local           root                    postgres
+local           root                    health

optional/postgresql/conf/queries.sql

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+-- name: create_user!
+-- Create the mailu user if it does not exist.
+do $$
+begin
+    create user mailu;
+    exception when others then
+    raise notice 'not creating mailu user -- it already exists';
+end
+$$;
+
+-- name: update_pw!
+alter
+    user mailu
+    password :pw;
+
+-- name: check_db
+-- check if the mailu db exists
+select 1
+    from pg_database
+    where datname = 'mailu';
+
+-- name: create_db!
+-- create the mailu db
+create
+    database mailu
+    owner mailu;

optional/postgresql/start.py

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+#!/usr/bin/python3
+
+import anosql
+import psycopg2
+import jinja2
+import glob
+import os
+
+def setup():
+    conn =  psycopg2.connect('user=postgres')
+    queries = anosql.load_queries('postgres', '/conf/queries.sql')
+    queries.create_user(conn)
+    queries.update_pw(conn, pw=os.environ.get("SECRET_KEY"))
+    conn.commit()
+    # create db cannot be atomic. But this script is the only active connection, this is kinda safe.
+    if not queries.check_db(conn):
+        conn.set_isolation_level(0)
+        queries.create_db(conn)
+        conn.set_isolation_level(1)
+    conn.close()
+
+# Bootstrap the database if postgresql is running for the first time
+if not os.path.exists('/var/lib/postgresql/data/pg_hba.conf'):
+    os.system("chown -R postgres:postgres /var/lib/postgresql")
+    os.system("su - postgres -c 'initdb -D /var/lib/postgresql/data'")
+
+convert = lambda src, dst: open(dst, "w").write(jinja2.Template(open(src).read()).render(**os.environ))
+for pg_file in glob.glob("/conf/*.conf"):
+    convert(pg_file, os.path.join("/var/lib/postgresql/data", os.path.basename(pg_file)))
+
+# Run postgresql locally for DB and user creation
+os.system("su - postgres -c 'pg_ctl start -D /var/lib/postgresql/data -o \"-h localhost\"'")
+setup()
+os.system("su - postgres -c 'pg_ctl stop -m smart -w -D /var/lib/postgresql/data'")
+
+# Run postgresql service
+os.system("su - postgres -c 'postgres -D /var/lib/postgresql/data -h \*'")