old_contents: #!/usr/bin/env python
  
  import sys
  
  config_file = sys.argv[1]
  
  # Convert configuration file into dict.
  config = {}
  with open(config_file) as file:
      for line in file:
          key, value = line.split("=")
          config[key.strip()] = value.strip()
  
  valid_config = True
  
  print(config)
  
  # Check that only one deployment option is configured.
  if bool(config["DEPLOY_HOSTS"]) ^ bool(config["DEPOY_REDUNDANCY"]):
      valid_config = False
      print("You must have one and only one of the following configured!")
      print("DEPLOY_HOSTS")
      print("DEPLOY_REDUNDANCY")
  
  # Cast config values to proper types.
  storage_nodes = config["BRIDGE_LIST"].strip("'").split()
  deployment_nodes = config["DEPLOY_HOSTS"].strip("'").split()
  redundancy_level = int(config["DEPLOY_REDUNDANCY"])
  
  # Check that deployment_nodes are subset of the bridge_list.
  
new_contents: #!/usr/bin/env python
  
  import sys
  
  config_file = sys.argv[1]
  
  # Convert configuration file into dict.
  config = {}
  with open(config_file) as file:
      for line in file:
          key, value = line.split("=")
          config[key.strip()] = value.strip()
  
  valid_config = True
  
  print(config)
  
  # Check that only one deployment option is configured.
  if bool(config["DEPLOY_HOSTS"]) ^ bool(config["DEPOY_REDUNDANCY"]):
      valid_config = False
      print("You must have one and only one of the following configured!")
      print("DEPLOY_HOSTS")
      print("DEPLOY_REDUNDANCY")
  
  # Cast config values to proper types.
  storage_nodes = config["BRIDGE_LIST"].strip("'").split()
  deployment_nodes = config["DEPLOY_HOSTS"].strip("'").split()
  redundancy_level = int(config["DEPLOY_REDUNDANCY"])
  
  # Check that deployment_nodes are a subset of, or equal to, all storeage nodes.
  if deployment_nodes:
      for node in deployment_nodes:
          if node not in storage_nodes:
              config = False
              print("%s not found in bridge list!" % node)
              print("Nodes in DEPLOY_HOSTS must be included in BRIDGE_LIST.")
  
      if len(deployment_nodes) > len(storage_nodes):
          valid_config = False
          print("DEPLOY_HOSTS contains more nodes than BRIDGE LIST.")
          print("BRIDGE list must contain all storage nodes.")
  
  # Check that redundancy level is not out of bounds.
  if redundancy_level:
      if not 0 <= redundancy_level <= len(storage_nodes):
          valid_config = False
          print("DEPLOY_REDUNDANCY must be a positive integer that is less than \
                  or equal to the number of nodes in BRIDGE_LIST")
  
subject: add checks for deployment options