Generate configuration file in sdist

When building source tarball, generate the configuration file to include
it in the sources.

Change-Id: I81f4669bdf6a4fe51c247b129a1e69c13a657131

MANIFEST.in

@@ -0,0 +1 @@
+include etc/gnocchi/gnocchi.conf

doc/source/configuration.rst

@@ -2,21 +2,9 @@
  Configuration
 ===============
 
-Configure Gnocchi by editing `/etc/gnocchi/gnocchi.conf`.
-
-No config file is provided with the source code, but one can be easily
-created by running:
-
-::
-
-    tox -e genconfig
-
-This command will create an `etc/gnocchi/gnocchi.conf` file which can be used
-as a base for the default configuration file at `/etc/gnocchi/gnocchi.conf`. If
-you're using *devstack*, this file is already generated and put in place.
-
-The configuration file should be pretty explicit, but here are some of the base
-options you want to change and configure:
+Configure Gnocchi by editing `/etc/gnocchi/gnocchi.conf`. The configuration
+file should be pretty explicit, but here are some of the base options you want
+to change and configure:
 
 
 +---------------------+---------------------------------------------------+

gnocchi/genconfig.py

@@ -0,0 +1,21 @@
+# -*- encoding: utf-8 -*-
+#
+# Copyright © 2016 Red Hat, Inc.
+#
+# 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 oslo_config import generator
+
+
+def sdist_prehook(sdist):
+    generator.main(['--config-file',
+                    'gnocchi-config-generator.conf'])

setup.cfg

@@ -73,9 +73,14 @@ test =
 setup-hooks =
     pbr.hooks.setup_hook
 
+[sdist]
+pre-hook.build_config = gnocchi.genconfig.sdist_prehook
+
 [files]
 packages =
     gnocchi
+data_files =
+    etc/gnocchi = etc/gnocchi/*
 
 [entry_points]
 gnocchi.indexer.resources =

tox.ini

@@ -24,7 +24,7 @@ setenv =
 
 commands =
     doc8 --ignore-path doc/source/rest.rst doc/source
-    oslo-config-generator --config-file=etc/gnocchi/gnocchi-config-generator.conf
+    oslo-config-generator --config-file=gnocchi-config-generator.conf
     {toxinidir}/run-tests.sh {posargs}
 
 [testenv:bashate]
@@ -64,7 +64,7 @@ show-source = true
 
 [testenv:genconfig]
 deps = .[mysql,postgresql,test,file,influxdb,ceph,swift]
-commands = oslo-config-generator --config-file=etc/gnocchi/gnocchi-config-generator.conf
+commands = oslo-config-generator --config-file=gnocchi-config-generator.conf
 
 [testenv:docs]
 # This does not work, see: https://bitbucket.org/hpk42/tox/issues/302