openstack/oslo.config
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Merge "improve documentation about registering entry points for config generator"

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Jenkins 2016-03-11 22:43:11 +00:00 committed by Gerrit Code Review
commit 141558e565
1 changed files with 22 additions and 1 deletions
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doc/source/generator.rst
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@ -87,7 +87,7 @@ values after *all* options are loaded.
The hooks are registered in a separate entry point namespace
(``oslo.config.opts.defaults``), using the same entry point name as
the application's ``list_opts()`` function.
**the application's** ``list_opts()`` function.
::
@ -95,6 +95,27 @@ the application's ``list_opts()`` function.
oslo.config.opts.defaults =
keystone = keystone.common.config:update_opt_defaults
.. warning::
Never, under any circumstances, register an entry point using a
name owned by another project. Doing so causes unexpected interplay
between projects within the config generator and will result in
failure to generate the configuration file or invalid values
showing in the sample.
In this case, the name of the entry point for the default override
function *must* match the name of one of the entry points defining
options for the application in order to be detected and
used. Applications that have multple list_opts functions should use
one that is present in the inputs for the config generator where
the changed defaults need to appear. For example, if an application
defines ``foo.api`` to list the API-related options, and needs to
override the defaults in the ``oslo.middleware.cors`` library, the
application should register ``foo.api`` under
``oslo.config.opts.defaults`` and point to a function within the
application code space that changes the defaults for
``oslo.middleware.cors``.
The update function should take no arguments. It should invoke the
public :func:`set_defaults` functions in any libraries for which it
has option defaults to override, just as the application does during