When user tries to create a resource with an existing name, we should return
HTTP 409 status code to tell the user and let him/her choose another one.

Signed-off-by: Hongliang Wang <hlwang@linux.vnet.ibm.com>
---
 src/kimchi/control/base.py | 2 ++
 src/kimchi/exception.py    | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/src/kimchi/control/base.py b/src/kimchi/control/base.py
index f8a5210..a110ac2 100644
--- a/src/kimchi/control/base.py
+++ b/src/kimchi/control/base.py
@@ -276,6 +276,8 @@ class Collection(object):
             raise cherrypy.HTTPError(400, e.message)
         except NotFoundError, e:
             raise cherrypy.HTTPError(404, e.message)
+        except ResourceAlreadyExists, e:
+            raise cherrypy.HTTPError(409, e.message)
         except OperationFailed, e:
             raise cherrypy.HTTPError(500, e.message)
         except KimchiException, e:
diff --git a/src/kimchi/exception.py b/src/kimchi/exception.py
index fcf60cc..38daeab 100644
--- a/src/kimchi/exception.py
+++ b/src/kimchi/exception.py
@@ -91,3 +91,7 @@ class IsoFormatError(KimchiException):

 class TimeoutExpired(KimchiException):
     pass
+
+
+class ResourceAlreadyExists(KimchiException):
+    pass