Add commands to show image metadata

- cinder image-metadata-show volume_id
This command can be used to show the image metadata associated
with the specific volume.

Partially implements: bp support-modify-volume-image-metadata

Change-Id: I960af66038b47c1206619b99a2bb5ae561a59c4f

cinderclient/tests/unit/v2/fakes.py

@@ -453,6 +453,8 @@ class FakeHTTPClient(base_client.HTTPClient):
             assert list(body[action]) == ['metadata']
         elif action == 'os-unset_image_metadata':
             assert 'key' in body[action]
+        elif action == 'os-show_image_metadata':
+            assert body[action] is None
         else:
             raise AssertionError("Unexpected action: %s" % action)
         return (resp, {}, _body)

cinderclient/tests/unit/v2/test_shell.py

@@ -1091,3 +1091,15 @@ class ShellTest(utils.TestCase):
     def test_get_capabilities(self):
         self.run_command('get-capabilities host')
         self.assert_called('GET', '/capabilities/host')
+
+    def test_image_metadata_show(self):
+        # since the request is not actually sent to cinder API but is
+        # calling the method in :class:`v2.fakes.FakeHTTPClient` instead.
+        # Thus, ignore any exception which is false negative compare
+        # with real API call.
+        try:
+            self.run_command('image-metadata-show 1234')
+        except Exception:
+            pass
+        expected = {"os-show_image_metadata": None}
+        self.assert_called('POST', '/volumes/1234/action', body=expected)

cinderclient/v2/shell.py

@@ -1910,6 +1910,16 @@ def do_metadata_show(cs, args):
     utils.print_dict(volume._info['metadata'], 'Metadata-property')
 
 
+@utils.arg('volume', metavar='<volume>',
+           help='ID of volume.')
+@utils.service_type('volumev2')
+def do_image_metadata_show(cs, args):
+    """Shows volume image metadata."""
+    volume = utils.find_volume(cs, args.volume)
+    resp, body = volume.show_image_metadata(volume)
+    utils.print_dict(body['metadata'], 'Metadata-property')
+
+
 @utils.arg('volume',
            metavar='<volume>',
            help='ID of volume for which to update metadata.')

cinderclient/v2/volumes.py

@@ -114,6 +114,14 @@ class Volume(base.Resource):
         """
         return self.manager.delete_image_metadata(self, volume, keys)
 
+    def show_image_metadata(self, volume):
+        """Show a volume's image metadata.
+
+        :param volume : The :class: `Volume` where the image metadata
+            associated.
+        """
+        return self.manager.show_image_metadata(self)
+
     def upload_to_image(self, force, image_name, container_format,
                         disk_format):
         """Upload a volume to image service as an image."""
@@ -518,6 +526,14 @@ class VolumeManager(base.ManagerWithFind):
             self._action("os-unset_image_metadata", volume,
                          {'key': key})
 
+    def show_image_metadata(self, volume):
+        """Show a volume's image metadata.
+
+        :param volume : The :class: `Volume` where the image metadata
+            associated.
+        """
+        return self._action("os-show_image_metadata", volume)
+
     def upload_to_image(self, volume, force, image_name, container_format,
                         disk_format):
         """Upload volume to image service as image.