Add pbr wsgi script entrypoint to glance

This commit adds a pbr entrypoint for the wsgi script file. This enables
deploying glance as a proper wsgi application instead of a standalone
service.

Change-Id: I089a22a4be4227a551c32442dba27c426f54c87d

glance/common/wsgi_app.py

@@ -0,0 +1,55 @@
+# 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.
+
+import os
+
+import glance_store
+from oslo_config import cfg
+from oslo_log import log as logging
+import osprofiler.initializer
+
+from glance.common import config
+from glance import notifier
+
+CONF = cfg.CONF
+CONF.import_group("profiler", "glance.common.wsgi")
+logging.register_options(CONF)
+
+CONFIG_FILES = ['glance-api-paste.ini', 'glance-api.conf']
+
+
+def _get_config_files(env=None):
+    if env is None:
+        env = os.environ
+    dirname = env.get('OS_GLANCE_CONFIG_DIR', '/etc/glance').strip()
+    return [os.path.join(dirname, config_file) for config_file in CONFIG_FILES]
+
+
+def _setup_os_profiler():
+    notifier.set_defaults()
+    if CONF.profiler.enabled:
+        osprofiler.initializer.init_from_conf(conf=CONF,
+                                              context={},
+                                              project='glance',
+                                              service='api',
+                                              host=CONF.bind_host)
+
+
+def init_app():
+    config_files = _get_config_files()
+    CONF([], project='glance', default_config_files=config_files)
+    logging.setup(CONF, "glance")
+    glance_store.register_opts(CONF)
+    glance_store.create_stores(CONF)
+    glance_store.verify_default_store()
+    _setup_os_profiler()
+    return config.load_paste_app('glance-api')

setup.cfg

@@ -34,6 +34,8 @@ console_scripts =
     glance-registry = glance.cmd.registry:main
     glance-replicator = glance.cmd.replicator:main
     glance-scrubber = glance.cmd.scrubber:main
+wsgi_scripts =
+    glance-wsgi-api = glance.common.wsgi_app:init_app
 glance.common.image_location_strategy.modules =
     location_order_strategy = glance.common.location_strategy.location_order
     store_type_strategy = glance.common.location_strategy.store_type