Generate PDF documentation

This commit adds a new tox target to build PDF documentation.
It's a part of community goal, see storyboard for more
information.

Change-Id: I58b1fb537c3758bba5a57d3cf7ce4cf10625bd89
Story: 2006076
Task: 34813

doc/source/conf.py

@@ -102,14 +102,27 @@ htmlhelp_basename = '%sdoc' % project
 
 html_last_updated_fmt = '%Y-%m-%d %H:%M'
 
+# Disable usage of xindy https://bugzilla.redhat.com/show_bug.cgi?id=1643664
+latex_use_xindy = False
+
+latex_domain_indices = False
+
+latex_elements = {
+    'makeindex': '',
+    'printindex': '',
+    'preamble': r'\setcounter{tocdepth}{3}',
+}
+
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, documentclass
 # [howto/manual]).
+# NOTE: Specify toctree_only=True for a better document structure of
+# the generated PDF file.
 latex_documents = [
     ('index',
-     '%s.tex' % project,
-     u'%s Documentation' % project,
-     u'OpenStack Foundation', 'manual'),
+     'doc-%s.tex' % project,
+     u'Congress Documentation',
+     u'OpenStack Foundation', 'manual', True),
 ]
 
 # Example configuration for intersphinx: refer to the Python standard library.

tox.ini

@@ -83,6 +83,16 @@ deps = -r{toxinidir}/doc/requirements.txt
 commands = rm -rf doc/build doc/source/api
            sphinx-build -W -b html doc/source doc/build/html
 
+[testenv:pdf-docs]
+basepython = python3
+envdir = {toxworkdir}/docs
+deps = {[testenv:docs]deps}
+whitelist_externals =
+  make
+commands =
+  sphinx-build -W -b latex doc/source doc/build/pdf
+  make -C doc/build/pdf
+
 [testenv:releasenotes]
 basepython = python3
 deps = -r{toxinidir}/doc/requirements.txt