Add --version CLI opt and __version__ module attr

Change-Id: I8c39a797e79429dd21c5caf093b076a4b1757de0

keystoneclient/__init__.py

@@ -0,0 +1,35 @@
+# Copyright 2012 OpenStack LLC.
+# 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.
+
+import inspect
+import os
+
+
+def _get_client_version():
+    """Read version from versioninfo file."""
+    mod_abspath = inspect.getabsfile(inspect.currentframe())
+    client_path = os.path.dirname(mod_abspath)
+    version_path = os.path.join(client_path, 'versioninfo')
+
+    if os.path.exists(version_path):
+        version = open(version_path).read().strip()
+    else:
+        version = "Unknown, couldn't find versioninfo file at %s"\
+                  % version_path
+
+    return version
+
+
+__version__ = _get_client_version()

keystoneclient/shell.py

@@ -24,6 +24,7 @@ import httplib2
 import os
 import sys
 
+import keystoneclient
 from keystoneclient import exceptions as exc
 from keystoneclient import utils
 from keystoneclient.v2_0 import shell as shell_v2_0
@@ -63,6 +64,10 @@ class OpenStackIdentityShell(object):
                             action='store_true',
                             help=argparse.SUPPRESS)
 
+        parser.add_argument('--version',
+                            action='version',
+                            version=keystoneclient.__version__)
+
         parser.add_argument('--debug',
                             default=False,
                             action='store_true',

setup.py

@@ -41,5 +41,6 @@ setuptools.setup(
 
     entry_points={
         'console_scripts': ['keystone = keystoneclient.shell:main']
-    }
+    },
+    data_files=[('keystoneclient', ['keystoneclient/versioninfo'])],
 )