Move common logging start code to init/common

src/init/common.cpp

@@ -115,4 +115,41 @@ void SetLoggingCategories(const ArgsManager& args)
         }
     }
 }
+
+bool StartLogging(const ArgsManager& args)
+{
+    if (LogInstance().m_print_to_file) {
+        if (args.GetBoolArg("-shrinkdebugfile", LogInstance().DefaultShrinkDebugFile())) {
+            // Do this first since it both loads a bunch of debug.log into memory,
+            // and because this needs to happen before any other debug.log printing
+            LogInstance().ShrinkDebugFile();
+        }
+    }
+    if (!LogInstance().StartLogging()) {
+            return InitError(strprintf(Untranslated("Could not open debug log file %s"),
+                LogInstance().m_file_path.string()));
+    }
+
+    if (!LogInstance().m_log_timestamps)
+        LogPrintf("Startup time: %s\n", FormatISO8601DateTime(GetTime()));
+    LogPrintf("Default data directory %s\n", GetDefaultDataDir().string());
+    LogPrintf("Using data directory %s\n", GetDataDir().string());
+
+    // Only log conf file usage message if conf file actually exists.
+    fs::path config_file_path = GetConfigFile(args.GetArg("-conf", BITCOIN_CONF_FILENAME));
+    if (fs::exists(config_file_path)) {
+        LogPrintf("Config file: %s\n", config_file_path.string());
+    } else if (args.IsArgSet("-conf")) {
+        // Warn if no conf file exists at path provided by user
+        InitWarning(strprintf(_("The specified config file %s does not exist"), config_file_path.string()));
+    } else {
+        // Not categorizing as "Warning" because it's the default behavior
+        LogPrintf("Config file: %s (not found, skipping)\n", config_file_path.string());
+    }
+
+    // Log the config arguments to debug.log
+    args.LogArgs();
+
+    return true;
+}
 } // namespace init