Simplify migrations automation

README.md

@@ -74,9 +74,9 @@ Migrations
 ----------
 
 Once all dependencies are installed it is necessary to run database migrations.
-Before that please edit [alembic.ini](alembic.ini) line #32
+Before that it is necessary to set env variable:
 
-    sqlalchemy.url = mysql+pymysql://root:root@localhost/functions
+    export LAOS_MIGRATIONS_DB=mysql+pymysql://root:root@localhost/functions
 
 In this section please specify connection URI to your own MySQL database.
 Once the file is saved, just use alembic to apply the migrations:

alembic.ini

@@ -29,7 +29,7 @@ script_location = migrations
 # are written from script.py.mako
 # output_encoding = utf-8
 
-sqlalchemy.url = mysql+pymysql://root:root@192.168.0.112/functions
+sqlalchemy.url = ""
 
 
 # Logging configuration

migrations/env.py

@@ -3,6 +3,8 @@ from alembic import context
 from sqlalchemy import engine_from_config, pool
 from logging.config import fileConfig
 
+import os
+
 # this is the Alembic Config object, which provides
 # access to the values within the .ini file in use.
 config = context.config
@@ -21,6 +23,7 @@ target_metadata = None
 # can be acquired:
 # my_important_option = config.get_main_option("my_important_option")
 # ... etc.
+config.set_main_option("sqlalchemy.url", os.getenv("LAOS_MIGRATIONS_DB"))
 
 
 def run_migrations_offline():