add: new wrapper to migrate libvirt vm

ccnode/libvirtwrapper.py

@@ -566,6 +566,30 @@ class LibvirtVm(VM):
             raise VMError('deletion of VM `%s` failed' % self.get_name())
         self._hv_handle._cache_vm_rebuild()
     
+    def migrate(self, host, port):
+        '''
+        '''
+        if self.hypervisor().get_hv_type() == 'xen':
+            flags = (libvirt.VIR_MIGRATE_LIVE ^
+                    libvirt.VIR_MIGRATE_PERSIST_DEST ^
+                    libvirt.VIR_MIGRATE_UNDEFINE_SOURCE)
+            uri = 'xenmigr://%s:%d' % (host, port)
+        else:
+            flags = (libvirt.VIR_MIGRATE_LIVE ^
+                    libvirt.VIR_MIGRATE_PERSIST_DEST ^
+                    libvirt.VIR_MIGRATE_UNDEFINE_SOURCE ^
+                    libvirt.VIR_MIGRATE_PEER2PEER ^
+                    libvirt.VIR_MIGRATE_TUNNELLED)
+            uri = 'qemu+tcp://%s:%d/system' % (host, port)
+        
+        try:
+            self._domain.migrate(self._hv_handle._lvcon_handle, flags, None, uri, 0)
+        except libvirt.libvirtError as err:
+            # FIXME ignore bogus exception properly
+            if not ('no domain with matching name' in err.message
+                                    or 'Domain not found' in err.message):
+                raise err
+    
     def power_on(self):
         '''
         '''