text: #!/usr/bin/env python3
  # Copyright (c) 2017 The Bitcoin Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test various command line arguments and configuration file parameters."""
  
  import os
  
  from test_framework.test_framework import BitcoinTestFramework
  from test_framework.util import get_datadir_path
  
  class ConfArgsTest(BitcoinTestFramework):
      def set_test_params(self):
          self.setup_clean_chain = True
          self.num_nodes = 1
  
      def run_test(self):
          self.stop_node(0)
          # Remove the -datadir argument so it doesn't override the config file
          self.nodes[0].args = [arg for arg in self.nodes[0].args if not arg.startswith("-datadir")]
  
          default_data_dir = get_datadir_path(self.options.tmpdir, 0)
          new_data_dir = os.path.join(default_data_dir, 'newdatadir')
          new_data_dir_2 = os.path.join(default_data_dir, 'newdatadir2')
  
          # Check that using -datadir argument on non-existent directory fails
          self.nodes[0].datadir = new_data_dir
          self.assert_start_raises_init_error(0, ['-datadir='+new_data_dir], 'Error: Specified data directory "' + new_data_dir + '" does not exist.')
  
          # Check that using non-existent datadir in conf file fails
          conf_file = os.path.join(default_data_dir, "kevacoin.conf")
          with open(conf_file, 'a', encoding='utf8') as f:
              f.write("datadir=" + new_data_dir + "\n")
          self.assert_start_raises_init_error(0, ['-conf='+conf_file], 'Error reading configuration file: specified data directory "' + new_data_dir + '" does not exist.')
  
          # Create the directory and ensure the config file now works
          os.mkdir(new_data_dir)
          self.start_node(0, ['-conf='+conf_file, '-wallet=w1'])
          self.stop_node(0)
          assert os.path.isfile(os.path.join(new_data_dir, 'regtest', 'wallets', 'w1'))
  
          # Ensure command line argument overrides datadir in conf
          os.mkdir(new_data_dir_2)
          self.nodes[0].datadir = new_data_dir_2
          self.start_node(0, ['-datadir='+new_data_dir_2, '-conf='+conf_file, '-wallet=w2'])
          assert os.path.isfile(os.path.join(new_data_dir_2, 'regtest', 'wallets', 'w2'))
  
  if __name__ == '__main__':
      ConfArgsTest().main()
  