[PATCH] Clean up dom_get() usage

[Dan Smith <danms@us.ibm.com>]

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This patch adds sanity checks everywhere dom_get() is used.

In the case of XendDomainInfo.update(), if we get None back from
dom_get(), we destroy ourselves.  I believe that this should be the
desired behavior, but arguments to the contrary are welcome.

Signed-off-by: Dan Smith <danms@us.ibm.com>


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diff -r c27431cf81f9 tools/python/xen/xend/XendDomainInfo.py
--- a/tools/python/xen/xend/XendDomainInfo.py	Thu Sep 15 13:17:24 2005
+++ b/tools/python/xen/xend/XendDomainInfo.py	Thu Sep 15 10:08:16 2005
@@ -117,6 +117,7 @@
     except Exception, err:
         # ignore missing domain
         log.exception("domain_getinfo(%d) failed, ignoring", dom)
+
     return None
 
 class XendDomainInfo:
@@ -356,9 +357,15 @@
         if info:
             self.info = info
         else:
-            di = dom_get(self.domid)
-            if not di:
-                return 
+            self.info = dom_get(self.domid)
+            # If we try to update and fail, we must have been
+            # deleted from the hypervisor
+            if not self.info:
+                log.debug("failed to get info for myself(%s); destroying..."%
+                          self.name)
+                self.destroy()
+                return
+            
         self.memory = self.info['mem_kb'] / 1024
         self.ssidref = self.info['ssidref']
 
@@ -1116,7 +1123,11 @@
                 else:
                     raise
             # get run-time value of vcpus and update store
-            self.configure_vcpus(dom_get(self.domid)['vcpus'])
+            dom0 = dom_get(self.domid)
+            if not dom0:
+                log.error("Failed to get info for dom0 while trying to configure VCPUs!")
+            else:
+                self.configure_vcpus(dom0['vcpus'])
 
 
 def vm_field_ignore(_, _1, _2, _3):

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-- 
Dan Smith
IBM Linux Technology Center
Open Hypervisor Team
email: danms@us.ibm.com

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