[PATCH 6 of 6] tools/xend: move assert to exception block

[Olaf Hering <olaf@aepfle.de>]

# HG changeset patch
# User Olaf Hering <olaf@aepfle.de>
# Date 1363624025 -3600
# Node ID 07a436dc7cbd710f219f9728704b5e8de8de0a39
# Parent  9e5bec95fd04a05d0b009adcc3f10f635ab638be
tools/xend: move assert to exception block

The two assert in restore trigger sometimes after hundreds of
migrations. If they trigger the destination host will not destroy the
newly created, still empty guest. After a second migration attempt to
this host there will be two guets with the same name and uuid. This
situation is poorly handled by the xm tools.
With this change the guest will be destroyed.

Signed-off-by: Olaf Hering <olaf@aepfle.de>

diff -r 9e5bec95fd04 -r 07a436dc7cbd tools/python/xen/xend/XendCheckpoint.py
--- a/tools/python/xen/xend/XendCheckpoint.py
+++ b/tools/python/xen/xend/XendCheckpoint.py
@@ -262,9 +262,6 @@ def restore(xd, fd, dominfo = None, paus
     store_port   = dominfo.getStorePort()
     console_port = dominfo.getConsolePort()
 
-    assert store_port
-    assert console_port
-
     # if hvm, pass mem size to calculate the store_mfn
     if is_hvm:
         apic = int(dominfo.info['platform'].get('apic', 0))
@@ -276,6 +273,9 @@ def restore(xd, fd, dominfo = None, paus
         pae  = 0
 
     try:
+        assert store_port
+        assert console_port
+
         restore_image = image.create(dominfo, dominfo.info)
         memory = restore_image.getRequiredAvailableMemory(
             dominfo.info['memory_dynamic_max'] / 1024)