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-rw-r--r--cinderclient/v3/shell.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/cinderclient/v3/shell.py b/cinderclient/v3/shell.py
index 6d7d1eb..9865d38 100644
--- a/cinderclient/v3/shell.py
+++ b/cinderclient/v3/shell.py
@@ -2297,6 +2297,8 @@ def do_attachment_show(cs, args):
help='Name or ID of volume or volumes to attach.')
@utils.arg('server_id',
metavar='<server_id>',
+ nargs='?',
+ default=None,
help='ID of server attaching to.')
@utils.arg('--connect',
metavar='<connect>',