text: #!/usr/bin/env python3
  # Copyright (c) 2017-2020 The DigiByte Core developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  """Test loadblock option
  
  Test the option to start a node with the option loadblock which loads
  a serialized blockchain from a file (usually called bootstrap.dat).
  To generate that file this test uses the helper scripts available
  in contrib/linearize.
  """
  
  import os
  import subprocess
  import sys
  import tempfile
  import urllib
  
  from test_framework.blocktools import COINBASE_MATURITY
  from test_framework.test_framework import DigiByteTestFramework
  from test_framework.util import assert_equal
  
  
  class LoadblockTest(DigiByteTestFramework):
      def set_test_params(self):
          self.setup_clean_chain = True
          self.num_nodes = 2
          self.supports_cli = False
  
      def run_test(self):
          self.nodes[1].setnetworkactive(state=False)
          self.nodes[0].generate(COINBASE_MATURITY)
  
          # Parsing the url of our node to get settings for config file
          data_dir = self.nodes[0].datadir
          node_url = urllib.parse.urlparse(self.nodes[0].url)
          cfg_file = os.path.join(data_dir, "linearize.cfg")
          bootstrap_file = os.path.join(self.options.tmpdir, "bootstrap.dat")
          genesis_block = self.nodes[0].getblockhash(0)
          blocks_dir = os.path.join(data_dir, self.chain, "blocks")
          hash_list = tempfile.NamedTemporaryFile(dir=data_dir,
                                                  mode='w',
                                                  delete=False,
                                                  encoding="utf-8")
  
          self.log.info("Create linearization config file")
          with open(cfg_file, "a", encoding="utf-8") as cfg:
              cfg.write("datadir={}\n".format(data_dir))
              cfg.write("rpcuser={}\n".format(node_url.username))
              cfg.write("rpcpassword={}\n".format(node_url.password))
              cfg.write("port={}\n".format(node_url.port))
              cfg.write("host={}\n".format(node_url.hostname))
              cfg.write("output_file={}\n".format(bootstrap_file))
              cfg.write("max_height=100\n")
              cfg.write("netmagic=fabfb5da\n")
              cfg.write("input={}\n".format(blocks_dir))
              cfg.write("genesis={}\n".format(genesis_block))
              cfg.write("hashlist={}\n".format(hash_list.name))
  
          base_dir = self.config["environment"]["SRCDIR"]
          linearize_dir = os.path.join(base_dir, "contrib", "linearize")
  
          self.log.info("Run linearization of block hashes")
          linearize_hashes_file = os.path.join(linearize_dir, "linearize-hashes.py")
          subprocess.run([sys.executable, linearize_hashes_file, cfg_file],
                         stdout=hash_list,
                         check=True)
  
          self.log.info("Run linearization of block data")
          linearize_data_file = os.path.join(linearize_dir, "linearize-data.py")
          subprocess.run([sys.executable, linearize_data_file, cfg_file],
                         check=True)
  
          self.log.info("Restart second, unsynced node with bootstrap file")
          self.restart_node(1, extra_args=["-loadblock=" + bootstrap_file])
          assert_equal(self.nodes[1].getblockcount(), 100)  # start_node is blocking on all block files being imported
  
          assert_equal(self.nodes[1].getblockchaininfo()['blocks'], 100)
          assert_equal(self.nodes[0].getbestblockhash(), self.nodes[1].getbestblockhash())
  
  
  if __name__ == '__main__':
      LoadblockTest().main()
  