salt/doc/topics/tutorials/packaging_modules.rst

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.. _tutorial-packaging-modules:
===================================
Packaging External Modules for Salt
===================================
External Modules Setuptools Entry-Points Support
================================================
The salt loader was enhanced to look for external modules by looking at the
`salt.loader` entry-point:
https://pythonhosted.org/setuptools/setuptools.html#dynamic-discovery-of-services-and-plugins
`pkg_resources` should be installed, which is normally included in setuptools.
https://pythonhosted.org/setuptools/pkg_resources.html
The package which has custom engines, minion modules, outputters, etc, should
require setuptools and should define the following entry points in its setup
function:
.. code-block:: python
from setuptools import setup, find_packages
setup(name=<NAME>,
version=<VERSION>,
description=<DESC>,
author=<AUTHOR>,
author_email=<AUTHOR-EMAIL>,
url=' ... ',
packages=find_packages(),
entry_points='''
[salt.loader]
engines_dirs = <package>.<loader-module>:engines_dirs
fileserver_dirs = <package>.<loader-module>:fileserver_dirs
pillar_dirs = <package>.<loader-module>:pillar_dirs
returner_dirs = <package>.<loader-module>:returner_dirs
roster_dirs = <package>.<loader-module>:roster_dirs
''')
The above setup script example mentions a loader module. here's an example of
how `<package>/<loader-module>.py` it should look:
.. code-block:: python
# -*- coding: utf-8 -*-
# Import python libs
import os
PKG_DIR = os.path.abspath(os.path.dirname(__file__))
def engines_dirs():
'''
yield one path per parent directory of where engines can be found
'''
yield os.path.join(PKG_DIR, 'engines_1')
yield os.path.join(PKG_DIR, 'engines_2')
def fileserver_dirs():
'''
yield one path per parent directory of where fileserver modules can be found
'''
yield os.path.join(PKG_DIR, 'fileserver')
def pillar_dirs():
'''
yield one path per parent directory of where external pillar modules can be found
'''
yield os.path.join(PKG_DIR, 'pillar')
def returner_dirs():
'''
yield one path per parent directory of where returner modules can be found
'''
yield os.path.join(PKG_DIR, 'returners')
def roster_dirs():
'''
yield one path per parent directory of where roster modules can be found
'''
yield os.path.join(PKG_DIR, 'roster')