Correct image lookup during server rebuild

The switch to using glance from the SDK accidentally used get_image
directly during a server rebuild, when it should have used find_image to
match existing functionality.

Bug introduced in: I36f292fb70c98f6e558f58be55d533d979c47ca7

Change-Id: I2005bd40a1bd6719670c7f7854316b4f9801b140
Story: 2007620
Task: 39643

Author: rm-you

openstackclient/compute/v2/server.py

@@ -1921,9 +1921,12 @@ def _show_progress(progress):
             compute_client.servers, parsed_args.server)
 
         # If parsed_args.image is not set, default to the currently used one.
-        image_id = parsed_args.image or server.to_dict().get(
-            'image', {}).get('id')
-        image = image_client.get_image(image_id)
+        if parsed_args.image:
+            image = image_client.find_image(
+                parsed_args.image, ignore_missing=False)
+        else:
+            image_id = server.to_dict().get('image', {}).get('id')
+            image = image_client.get_image(image_id)
 
         kwargs = {}
         if parsed_args.property:

openstackclient/tests/unit/compute/v2/test_server.py

@@ -3577,6 +3577,41 @@ def setUp(self):
 
         self.cmd = server.RebuildServer(self.app, None)
 
+    def test_rebuild_with_image_name(self):
+        image_name = 'my-custom-image'
+        user_image = image_fakes.FakeImage.create_one_image(
+            attrs={'name': image_name})
+        self.find_image_mock.return_value = user_image
+
+        attrs = {
+            'image': {
+                'id': user_image.id
+            },
+            'networks': {},
+            'adminPass': 'passw0rd',
+        }
+        new_server = compute_fakes.FakeServer.create_one_server(attrs=attrs)
+        self.server.rebuild.return_value = new_server
+
+        arglist = [
+            self.server.id,
+            '--image', image_name
+        ]
+        verifylist = [
+            ('server', self.server.id),
+            ('image', image_name)
+        ]
+        parsed_args = self.check_parser(self.cmd, arglist, verifylist)
+
+        # Get the command object to test.
+        self.cmd.take_action(parsed_args)
+
+        self.servers_mock.get.assert_called_with(self.server.id)
+        self.find_image_mock.assert_called_with(
+            image_name, ignore_missing=False)
+        self.get_image_mock.assert_called_with(user_image.id)
+        self.server.rebuild.assert_called_with(user_image, None)
+
     def test_rebuild_with_current_image(self):
         arglist = [
             self.server.id,
@@ -3590,6 +3625,7 @@ def test_rebuild_with_current_image(self):
         self.cmd.take_action(parsed_args)
 
         self.servers_mock.get.assert_called_with(self.server.id)
+        self.find_image_mock.assert_not_called()
         self.get_image_mock.assert_called_with(self.image.id)
         self.server.rebuild.assert_called_with(self.image, None)