[Doc] OpenStack API Reference Guide

Baseline changes to comply with OpenStack API documentation
from OpenStack Documentation Contributor Guide [0]:

- [1] How to document your OpenStack API service

[0] https://docs.openstack.org/doc-contrib-guide
[1] https://docs.openstack.org/doc-contrib-guide/api-guides.html

Story: 2002712
Task: 26659

Change-Id: I873f6437d661b80248c39bfce2c1aefece78cca4
Signed-off-by: Abraham Arce <abraham.arce.moreno@intel.com>

.gitignore

@@ -27,3 +27,6 @@ doc/build
 
 # Release Notes documentation
 releasenotes/build
+
+# Api Ref documentation
+api-ref/build/

api-ref/source/conf.py

@@ -0,0 +1,66 @@
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# stx-update API reference documentation build configuration file
+#
+# This file is execfile()d with the current directory set to
+# its containing dir.
+#
+# Note that not all possible configuration values are present in this
+# autogenerated file.
+#
+# All configuration values have a default; values that are commented out
+# serve to show the default.
+
+import os
+import sys
+
+extensions = [
+    'openstackdocstheme',
+    'os_api_ref',
+]
+
+html_theme = 'openstackdocs'
+
+html_theme_options = {
+    "sidebar_dropdown": "api_ref",
+    "sidebar_mode": "toc",
+}
+
+# If extensions (or modules to document with autodoc) are in another directory,
+# add these directories to sys.path here. If the directory is relative to the
+# documentation root, use os.path.abspath to make it absolute, like shown here.
+sys.path.insert(0, os.path.abspath('../../'))
+sys.path.insert(0, os.path.abspath('../'))
+sys.path.insert(0, os.path.abspath('./'))
+
+# The suffix of source filenames.
+source_suffix = '.rst'
+
+# The master toctree document.
+master_doc = 'index'
+
+# General information about the project.
+repository_name = 'openstack/stx-update'
+project = u'stx-update'
+bug_project = 'starlingx'
+bug_tag = 'stx.update'
+
+# If true, the current module name will be prepended to all description
+# unit titles (such as .. function::).
+add_module_names = False
+
+# If true, sectionauthor and moduleauthor directives will be shown in the
+# output. They are ignored by default.
+show_authors = False
+
+# The name of the Pygments (syntax highlighting) style to use.
+pygments_style = 'sphinx'
+
+# Grouping the document tree into LaTeX files. List of tuples
+# (source start file, target name, title, author, documentclass
+# [howto/manual]).
+latex_documents = [
+    ('index', 'stx-update.tex', u'stx-update API Documentation',
+     u'StarlingX', 'manual'),
+]

api-ref/source/index.rst

@@ -0,0 +1,8 @@
+========================
+stx-update API Reference
+========================
+
+StarlingX Installation/Update/Patching/Backup/Restore
+
+.. toctree::
+   :maxdepth: 2

doc/requirements.txt

@@ -3,3 +3,6 @@ openstackdocstheme>=1.19.0 # Apache-2.0
 
 # Release Notes documentation
 reno>=0.1.1 # Apache2
+
+# Api Ref documentation
+os-api-ref>=1.4.0 # Apache-2.0

tox.ini

@@ -134,3 +134,12 @@ whitelist_externals =
 envdir = {toxworkdir}/releasenotes
 deps = -r{toxinidir}/doc/requirements.txt
 commands = reno new {posargs}
+
+[testenv:api-ref]
+basepython = python3
+deps =
+    -r{toxinidir}/doc/requirements.txt
+commands =
+  rm -rf api-ref/build
+  sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
+whitelist_externals = rm