old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import sys
  
  # Get the Mesos cluster URL, assuming the EC2 script environment variables
  # are all available.
  
  active_master = os.getenv("MESOS_MASTERS").split("\n")[0]
  zoo_list = os.getenv("MESOS_ZOO_LIST")
  
  if zoo_list.strip() == "NONE":
    print active_master + ":5050"
  else:
    zoo_nodes = zoo_list.trim().split("\n")
    print "zoo://" + ",".join(["%s:2181/mesos" % node for node in zoo_nodes])
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  import os
  import sys
  
  # Get the Mesos cluster URL, assuming the EC2 script environment variables
  # are all available.
  
  active_master = os.getenv("MESOS_MASTERS").split("\n")[0]
  zoo_list = os.getenv("MESOS_ZOO_LIST")
  
  if zoo_list.strip() == "NONE":
    print "mesos://" + active_master + ":5050"
  else:
    zoo_nodes = zoo_list.trim().split("\n")
    print "zoo://" + ",".join(["%s:2181/mesos" % node for node in zoo_nodes])
  
subject: Include URI scheme in Mesos cluster_url