text: #!/usr/bin/env python3
  # Copyright (c) 2017-2021 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 debug logging."""
  
  import os
  
  from test_framework.test_framework import SyscoinTestFramework
  from test_framework.test_node import ErrorMatch
  
  
  class LoggingTest(SyscoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
  
      def relative_log_path(self, name):
          return os.path.join(self.nodes[0].datadir, self.chain, name)
  
      def run_test(self):
          # test default log file name
          default_log_path = self.relative_log_path("debug.log")
          assert os.path.isfile(default_log_path)
  
          # test alternative log file name in datadir
          self.restart_node(0, ["-debuglogfile=foo.log"])
          assert os.path.isfile(self.relative_log_path("foo.log"))
  
          # test alternative log file name outside datadir
          tempname = os.path.join(self.options.tmpdir, "foo.log")
          self.restart_node(0, [f"-debuglogfile={tempname}"])
          assert os.path.isfile(tempname)
  
          # check that invalid log (relative) will cause error
          invdir = self.relative_log_path("foo")
          invalidname = os.path.join("foo", "foo.log")
          self.stop_node(0)
          exp_stderr = r"Error: Could not open debug log file \S+$"
          self.nodes[0].assert_start_raises_init_error([f"-debuglogfile={invalidname}"], exp_stderr, match=ErrorMatch.FULL_REGEX)
          assert not os.path.isfile(os.path.join(invdir, "foo.log"))
  
          # check that invalid log (relative) works after path exists
          self.stop_node(0)
          os.mkdir(invdir)
          self.start_node(0, [f"-debuglogfile={invalidname}"])
          assert os.path.isfile(os.path.join(invdir, "foo.log"))
  
          # check that invalid log (absolute) will cause error
          self.stop_node(0)
          invdir = os.path.join(self.options.tmpdir, "foo")
          invalidname = os.path.join(invdir, "foo.log")
          self.nodes[0].assert_start_raises_init_error([f"-debuglogfile={invalidname}"], exp_stderr, match=ErrorMatch.FULL_REGEX)
          assert not os.path.isfile(os.path.join(invdir, "foo.log"))
  
          # check that invalid log (absolute) works after path exists
          self.stop_node(0)
          os.mkdir(invdir)
          self.start_node(0, [f"-debuglogfile={invalidname}"])
          assert os.path.isfile(os.path.join(invdir, "foo.log"))
  
          # check that -nodebuglogfile disables logging
          self.stop_node(0)
          os.unlink(default_log_path)
          assert not os.path.isfile(default_log_path)
          self.start_node(0, ["-nodebuglogfile"])
          assert not os.path.isfile(default_log_path)
  
          # just sanity check no crash here
          self.restart_node(0, [f"-debuglogfile={os.devnull}"])
  
  
  if __name__ == '__main__':
      LoggingTest().main()
  