Add missed 'Server ID' output in attachment-list

'server_id' is not Attachment attribute, should be
set by 'instance' attribute.

v3/attachments respond body:

{"attachments":
   [{"status": "attached",
     "instance": INSTANCE_UUID,
     "id": ATTACHMENT_UUID,
     "volume_id": VOLUME_UUID,
    },
    ...
    ]
}

Change-Id: Ica5d278cb7455befe1db4be0ab65114fd606ea0a

cinderclient/tests/unit/v3/fakes.py

@@ -30,6 +30,18 @@ fake_attachment = {'attachment': {
     'instance': 'e84fda45-4de4-4ce4-8f39-fc9d3b0aa05e',
     'volume_id': '557ad76c-ce54-40a3-9e91-c40d21665cc3', }}
 
+fake_attachment_list = {'attachments': [
+    {'instance': 'instance_1',
+     'name': 'attachment-1',
+     'volume_id': 'fake_volume_1',
+     'status': 'reserved',
+     'id': 'attachmentid_1'},
+    {'instance': 'instance_2',
+     'name': 'attachment-2',
+     'volume_id': 'fake_volume_2',
+     'status': 'reserverd',
+     'id': 'attachmentid_2'}]}
+
 fake_connection_info = {
     'auth_password': 'i6h9E5HQqSkcGX3H',
     'attachment_id': 'a232e9ae',
@@ -289,15 +301,7 @@ class FakeHTTPClient(fake_v2.FakeHTTPClient):
         return (200, {}, fake_attachment)
 
     def get_attachments(self, **kw):
-        return (200, {}, {
-            'attachments': [{'instance': 1,
-                             'name': 'attachment-1',
-                             'volume_id': 'fake_volume_1',
-                             'status': 'reserved'},
-                            {'instance': 2,
-                             'name': 'attachment-2',
-                             'volume_id': 'fake_volume_2',
-                             'status': 'reserverd'}]})
+        return (200, {}, fake_attachment_list)
 
     def post_attachments_a232e9ae_action(self, **kw):  # noqa: E501
         attached_fake = fake_attachment

cinderclient/tests/unit/v3/test_shell.py

@@ -51,6 +51,7 @@ from cinderclient import client
 from cinderclient import exceptions
 from cinderclient import shell
 from cinderclient import utils as cinderclient_utils
+from cinderclient.v3 import attachments
 from cinderclient.v3 import volume_snapshots
 from cinderclient.v3 import volumes
 
@@ -404,6 +405,21 @@ class ShellTest(utils.TestCase):
         self.run_command(command)
         self.assert_called('GET', '/attachments%s' % expected)
 
+    @mock.patch('cinderclient.utils.print_list')
+    @mock.patch.object(cinderclient.v3.attachments.VolumeAttachmentManager,
+            'list')
+    def test_attachment_list_setattr(self, mock_list, mock_print):
+        command = '--os-volume-api-version 3.27 attachment-list '
+        fake_attachment = [attachments.VolumeAttachment(mock.ANY, attachment)
+                for attachment in fakes.fake_attachment_list['attachments']]
+        mock_list.return_value = fake_attachment
+        self.run_command(command)
+        for attach in fake_attachment:
+            setattr(attach, 'server_id', getattr(attach, 'instance'))
+        columns = ['ID', 'Volume ID', 'Status', 'Server ID']
+        mock_print.assert_called_once_with(fake_attachment, columns,
+                sortby_index=0)
+
     def test_revert_to_snapshot(self):
         original = cinderclient_utils.find_resource
 

cinderclient/v3/shell.py

@@ -2180,6 +2180,8 @@ def do_attachment_list(cs, args):
                                       marker=args.marker,
                                       limit=args.limit,
                                       sort=args.sort)
+    for attachment in attachments:
+        setattr(attachment, 'server_id', getattr(attachment, 'instance', None))
     columns = ['ID', 'Volume ID', 'Status', 'Server ID']
     if args.sort:
         sortby_index = None