Create Postgresql image

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 \*'")