code: def _get_credentials(username=None, password=None, dbhost=None):
      
  
      # Database salt
      system_config = dbhost.objectmodels['systemconfig'].find_one({
          'active': True
      })
  
      try:
          salt = system_config.salt.encode('ascii')
      except (KeyError, AttributeError):
          log('No systemconfig or it is without a salt! '
              'Reinstall the system provisioning with'
              'hfos_manage.py install provisions -p system')
          sys.exit(3)
  
      if username is None:
          username = _ask("Please enter username: ")
      else:
          username = username
  
      if password is None:
          password = _ask_password()
      else:
          password = password
  
      try:
          password = password.encode('utf-8')
      except UnicodeDecodeError:
          password = password
  
      passhash = hashlib.sha512(password)
      passhash.update(salt)
  
      return username, passhash.hexdigest()
docs: Obtain user credentials by arguments or asking the user