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Søren Løvborg

db: enable use of main Kallithea config as Alembic config

Newly generated Kallithea config .ini files will be valid Alembic
config files, eliminating the need for a separate alembic.ini config
redundantly specifying the database connection string.

We reference the Alembic migration environment using kallithea:alembic,
which should work independently of how Kallithea is installed.

We also configure a default 'alembic' log level of WARNING, to reduce
the amount of clutter in the config file, reduce the changes needed
to upgrade existing config files for use with Alembic, and allowing us
to change the default Alembic log level for all users down the road.

(It makes sense to define Alembic logging in code, while all other
loggers are configured in the configuration file, because Alembic
is special: it runs on the command line, not as part of the web app.)

.. _debugging:

===================
Debugging Kallithea
===================

If you encounter problems with Kallithea, here are some instructions
on how to debug them.

.. note:: First make sure you're using the latest version available.


Enable detailed debug
---------------------

Kallithea uses the standard Python ``logging`` module to log its output.
By default only loggers with ``INFO`` level are displayed. To enable full output
change ``level = DEBUG`` for all logging handlers in the currently used .ini file.
This change will allow you to see much more detailed output in the log file or
console. This generally helps a lot to track issues.


Enable interactive debug mode
-----------------------------

To enable interactive debug mode simply comment out ``set debug = false`` in
the .ini file. This will trigger an interactive debugger each time
there is an error in the browser, or send a http link if an error occurred in the backend. This
is a great tool for fast debugging as you get a handy Python console right
in the web view.

.. warning:: NEVER ENABLE THIS ON PRODUCTION! The interactive console
             can be a serious security threat to your system.