Record timestamp in each installation.

slapos/grid/SlapObject.py

@@ -402,6 +402,13 @@ class Partition(object):
           partition_supervisor_configuration)
     self.updateSupervisor()
 
+    parameter_dict = self.computer_partition.getInstanceParameterDict()
+    if 'timestamp' in parameter_dict:
+      timestamp_path = os.path.join(self.instance_path, '.timestamp')
+      descriptor = open(timestamp_path, 'w')
+      descriptor.write(parameter_dict['timestamp'])
+      descriptor.close()
+
   def start(self):
     """Asks supervisord to start the instance. If this instance is not
     installed, we install it.