Print to console by default when not run with -daemon

Printing to the debug log file can be disabled with -nodebulogfile

test/functional/feature_logging.py

@@ -15,13 +15,17 @@ class LoggingTest(BitcoinTestFramework):
         self.num_nodes = 1
         self.setup_clean_chain = True
 
+    def relative_log_path(self, name):
+        return os.path.join(self.nodes[0].datadir, "regtest", name)
+
     def run_test(self):
         # test default log file name
-        assert os.path.isfile(os.path.join(self.nodes[0].datadir, "regtest", "debug.log"))
+        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(os.path.join(self.nodes[0].datadir, "regtest", "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")
@@ -29,7 +33,7 @@ class LoggingTest(BitcoinTestFramework):
         assert os.path.isfile(tempname)
 
         # check that invalid log (relative) will cause error
-        invdir = os.path.join(self.nodes[0].datadir, "regtest", "foo")
+        invdir = self.relative_log_path("foo")
         invalidname = os.path.join("foo", "foo.log")
         self.stop_node(0)
         exp_stderr = "Error: Could not open debug log file \S+$"
@@ -55,6 +59,17 @@ class LoggingTest(BitcoinTestFramework):
         self.start_node(0, ["-debuglogfile=%s" % (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.stop_node(0)
+        self.start_node(0, ["-debuglogfile=%s" % os.devnull])
+
 
 if __name__ == '__main__':
     LoggingTest().main()

test/functional/test_framework/test_node.py

@@ -78,7 +78,17 @@ class TestNode():
         # For those callers that need more flexibility, they can just set the args property directly.
         # Note that common args are set in the config file (see initialize_datadir)
         self.extra_args = extra_args
-        self.args = [self.binary, "-datadir=" + self.datadir, "-logtimemicros", "-debug", "-debugexclude=libevent", "-debugexclude=leveldb", "-mocktime=" + str(mocktime), "-uacomment=testnode%d" % i]
+        self.args = [
+            self.binary,
+            "-datadir=" + self.datadir,
+            "-logtimemicros",
+            "-debug",
+            "-debugexclude=libevent",
+            "-debugexclude=leveldb",
+            "-mocktime=" + str(mocktime),
+            "-uacomment=testnode%d" % i,
+            "-noprinttoconsole"
+        ]
 
         self.cli = TestNodeCLI(os.getenv("BITCOINCLI", "bitcoin-cli"), self.datadir)
         self.use_cli = use_cli