mailu/optional/postgresql/start.py

#!/usr/bin/python3

import anosql
import psycopg2
import jinja2
import glob
import os
import subprocess

def setup():
    conn =  psycopg2.connect(user = 'postgres')
    queries = anosql.load_queries('postgres', '/conf/queries.sql')
    # Mailu user
    queries.create_mailu_user(conn)
    queries.update_pw(conn, pw=os.environ.get("SECRET_KEY"))
    # Healthcheck user
    queries.create_health_user(conn)
    queries.grant_health(conn)
    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()
    conn = psycopg2.connect(user = 'postgres', database= 'mailu')
    queries.create_citext(conn)
    conn.commit()
    conn.close()

# Bootstrap the database if postgresql is running for the first time
if not os.path.exists('/data/pg_wal'):
    os.system("chown -R postgres:postgres /data")
    os.system("sudo -u postgres initdb -D /data")

# Create backup directory structure, if it does not yet exist
os.system("mkdir -p /backup/wal_archive")
os.system("chown -R postgres:postgres /backup")

# Render config files
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("/data", os.path.basename(pg_file)))

# Run postgresql locally for DB and user creation
os.system("sudo -u postgres pg_ctl start -D /data -o '-h \"''\" '")
setup()
os.system("sudo -u postgres pg_ctl stop -m smart -w -D /data")

out=open("/proc/1/fd/1", "w")
err=open("/proc/1/fd/2", "w")
# Run the cron deamon
subprocess.Popen(["crond", "-f"], stdout=out, stderr=err)
# Run postgresql service
os.system("sudo -u postgres postgres -D /data -h \*")