Add driver list to doc build

We have tox -e gendriverlist that outputs an RST-ish report of all drivers
in the tree. This output can be used in the docs build to automatically
publish the list of drivers to make it easier to find officially supported
drivers.

This effectively removes the existing drivers.html that was generated prior
that did not actually contain any useful information.

Change-Id: I8de78723af76aabcc976733ac4b248db0b8ca16f

.gitignore

@@ -30,6 +30,7 @@ tags
 # Files created by Sphinx build
 doc/build
 doc/source/_static/cinder.conf.sample
+doc/source/drivers.rst
 
 #Files created for API reference
 api-ref/build

doc/ext/cinder_driverlist.py

@@ -0,0 +1,24 @@
+# Copyright 2016 Dell Inc.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+#
+
+from cinder import utils
+
+
+def setup(app):
+    print('** Generating driver list...')
+    rv = utils.execute('./tools/generate_driver_list.py', ['docs'])
+    print(rv[0])
+

doc/source/conf.py

@@ -36,6 +36,7 @@ extensions = ['sphinx.ext.autodoc',
               'oslosphinx',
               'stevedore.sphinxext',
               'oslo_config.sphinxconfiggen',
+              'ext.cinder_driverlist',
               ]
 
 config_generator_config_file = '../../cinder/config/cinder-config-generator.conf'

doc/source/drivers.rst

@@ -1,6 +0,0 @@
-===================
- Available Drivers
-===================
-
-.. list-plugins:: oslo_messaging.notify.drivers
-    :detailed:

doc/source/index.rst

@@ -44,9 +44,20 @@ Developer Docs
    database_architecture
    scheduler-filters
    scheduler-weights
-   drivers
    oslo-middleware
 
+Drivers
+=======
+
+Cinder maintains drivers for volume backends, backup targets, and fibre
+channel zone manager fabric types. The list of the available drivers can be
+found here:
+
+.. toctree::
+   :maxdepth: 1
+
+   drivers
+
 API Extensions
 ==============
 

tools/generate_driver_list.py

@@ -15,30 +15,55 @@
 """Generate list of cinder drivers"""
 
 import os
+import sys
 
 from cinder.interface import util
 
 
-def format_description(desc):
+class Output(object):
+
+    def __init__(self, base_dir):
+        # At this point we don't care what was passed in, just a trigger
+        # to write this out to the doc tree for now
+        self.driver_file = None
+        if len(sys.argv) > 1:
+            self.driver_file = open(
+                '%s/doc/source/drivers.rst' % base_dir, 'w+')
+            self.driver_file.write('===================\n')
+            self.driver_file.write('Available Drivers\n')
+            self.driver_file.write('===================\n\n')
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, type, value, traceback):
+        self.driver_file.close()
+
+    def write(self, text):
+        if self.driver_file:
+            self.driver_file.write('%s\n' % text)
+        else:
+            print(text)
+
+
+def format_description(desc, output):
     desc = desc or '<None>'
     lines = desc.rstrip('\n').split('\n')
     for line in lines:
-        print('    %s' % line)
+        output.write('    %s' % line)
 
 
-def print_drivers(drivers, config_name):
-    # for driver in drivers.sort(key=lambda x: x.class_fqn):
+def print_drivers(drivers, config_name, output):
     for driver in sorted(drivers, key=lambda x: x.class_fqn):
-        print(driver.class_name)
-        print('-' * len(driver.class_name))
+        output.write(driver.class_name)
+        output.write('-' * len(driver.class_name))
         if driver.version:
-            print('* Version: %s' % driver.version)
-        print('* %s=%s' % (config_name, driver.class_fqn))
-        print('* Description::')
-        print('')
-        format_description(driver.desc)
-        print('')
-    print('')
+            output.write('* Version: %s' % driver.version)
+        output.write('* %s=%s' % (config_name, driver.class_fqn))
+        output.write('* Description:')
+        format_description(driver.desc, output)
+        output.write('')
+    output.write('')
 
 
 def main():
@@ -48,17 +73,18 @@ def main():
     os.chdir(cinder_root)
 
     try:
-        print('VOLUME DRIVERS')
-        print('==============')
-        print_drivers(util.get_volume_drivers(), 'volume_driver')
+        with Output(cinder_root) as output:
+            output.write('Volume Drivers')
+            output.write('==============')
+            print_drivers(util.get_volume_drivers(), 'volume_driver', output)
 
-        print('BACKUP DRIVERS')
-        print('==============')
-        print_drivers(util.get_backup_drivers(), 'backup_driver')
+            output.write('Backup Drivers')
+            output.write('==============')
+            print_drivers(util.get_backup_drivers(), 'backup_driver', output)
 
-        print('FC ZONE MANAGER DRIVERS')
-        print('=======================')
-        print_drivers(util.get_fczm_drivers(), 'zone_driver')
+            output.write('FC Zone Manager Drivers')
+            output.write('=======================')
+            print_drivers(util.get_fczm_drivers(), 'zone_driver', output)
     finally:
         os.chdir(cur_dir)
 

tox.ini

@@ -104,7 +104,8 @@ install_command = pip install -U --force-reinstall {opts} {packages}
 commands = {posargs}
 
 [testenv:docs]
-commands = python setup.py build_sphinx
+commands = 
+  python setup.py build_sphinx
 
 [testenv:gendriverlist]
 sitepackages = False