Change default values for glance_store

By default glance and glare will share common place to store data.
For example, for 'filesystem' backend it is '/var/lib/glance/images'.

To prevent possible collisions we have to redefine 4 glance_store default
values:
 * filesystem_store_datadir='/var/lib/glare/artifacts',
 * rbd_store_pool='artifacts',
 * vmware_store_image_dir='/openstack_glare',
 * swift_store_container='glare'

Change-Id: I37093eb491e13b1bd553bfc9788b89d9c95df937

glare/common/utils.py

@@ -29,6 +29,7 @@ import hashlib
 import os
 import re
 
+import glance_store
 from OpenSSL import crypto
 from oslo_config import cfg
 from oslo_log import log as logging
@@ -580,3 +581,26 @@ def validate_change_allowed(af, field_name):
         msg = (_("Forbidden to change field '%s' after activation.")
                % field_name)
         raise exception.Forbidden(message=msg)
+
+
+def initialize_glance_store():
+    """Initialize glance store."""
+    glance_store.register_opts(CONF)
+    set_glance_store_config_defaults()
+    glance_store.create_stores(CONF)
+    glance_store.verify_default_store()
+
+
+def set_glance_store_config_defaults():
+    # By default glance and glare share common place to store data.
+    # To prevent possible collisions we have to set other glance_store default
+    # values for various backends.
+    cfg.set_defaults(glance_store.backend._list_opts()[1][1],
+                     # default '/var/lib/glance/images
+                     filesystem_store_datadir='/var/lib/glare/artifacts',
+                     # default 'images'
+                     rbd_store_pool='artifacts',
+                     # default '/openstack_glance
+                     vmware_store_image_dir='/openstack_glare',
+                     # default 'glance'
+                     swift_store_container='glare')

glare/common/wsgi.py

@@ -33,7 +33,6 @@ from eventlet.green import socket
 from eventlet.green import ssl
 import eventlet.greenio
 import eventlet.wsgi
-import glance_store
 from oslo_concurrency import processutils
 from oslo_config import cfg
 from oslo_log import log as logging
@@ -212,13 +211,6 @@ def set_eventlet_hub():
                 reason=msg)
 
 
-def initialize_glance_store():
-    """Initialize glance store."""
-    glance_store.register_opts(CONF)
-    glance_store.create_stores(CONF)
-    glance_store.verify_default_store()
-
-
 def get_asynchronous_eventlet_pool(size=1000):
     """Return eventlet pool to caller.
 
@@ -361,7 +353,7 @@ class Server(object):
 
         self.configure_socket(old_conf, has_changed)
         if self.initialize_glance_store:
-            initialize_glance_store()
+            utils.initialize_glance_store()
 
     def reload(self):
         """Reload and re-apply configuration settings

glare/wsgi.py

@@ -35,11 +35,11 @@ Sample apache mod_wsgi configuration:
 
 import os
 
-import glance_store
 from oslo_config import cfg
 from oslo_log import log as logging
 
 from glare.common import config
+from glare.common import utils
 
 
 CONF = cfg.CONF
@@ -47,8 +47,6 @@ logging.register_options(CONF)
 CONFIG_FILE = os.environ.get("GLARE_CONFIG_FILE", "etc/glare.conf")
 config.parse_args(args=["--config-file", CONFIG_FILE])
 
-glance_store.register_opts(CONF)
-glance_store.create_stores(CONF)
-glance_store.verify_default_store()
+utils.initialize_glance_store()
 
 application = config.load_paste_app('glare-api')

setup.cfg

@@ -34,6 +34,8 @@ console_scripts =
     glare-scrubber = glare.cmd.scrubber:main
 oslo.config.opts =
     glare = glare.opts:list_artifacts_opts
+oslo.config.opts.defaults =
+    glare = glare.common.utils:set_glance_store_config_defaults
 oslo.policy.enforcer =
     glare = glare.common.policy:_get_enforcer
 oslo.policy.policies =