Adding --version option

Change-Id: I7d37af1ddee186af22457baea9af71a955720053

novaclient/__init__.py

@@ -11,3 +11,23 @@
 #   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_novaclient_version():
+    """Read version from versioninfo file."""
+    mod_abspath = inspect.getabsfile(inspect.currentframe())
+    novaclient_path = os.path.dirname(mod_abspath)
+    version_path = os.path.join(novaclient_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_novaclient_version()

novaclient/shell.py

@@ -28,6 +28,7 @@ import pkgutil
 import sys
 import logging
 
+import novaclient
 from novaclient import client
 from novaclient import exceptions as exc
 import novaclient.extension
@@ -81,6 +82,10 @@ class OpenStackComputeShell(object):
             help=argparse.SUPPRESS,
         )
 
+        parser.add_argument('--version',
+                            action='version',
+                            version=novaclient.__version__)
+
         parser.add_argument('--debug',
             default=False,
             action='store_true',

setup.py

@@ -47,5 +47,6 @@ setuptools.setup(
     ],
     entry_points={
         "console_scripts": ["nova = novaclient.shell:main"]
-    }
+    },
+    data_files=[('novaclient', ['novaclient/versioninfo'])]
 )