Merge #13799: Ignore unknown config file options; warn instead of error

247d5740d2 Ignore unknown config file options for now (Pieter Wuille)
04ce0d88ca Report when unknown config file options are ignored (Pieter Wuille)

Pull request description:

  As reported by @satwo on IRC a few days ago, the current mechanism of treating unknown config file options as errors is problematic for options like `-rpcclienttimeout` which aren't defined for `bitcoind`.

  A full solution would be to either make all binaries be aware of each other's options, or to permit config file options that only apply to specific binaries (`bitcoind`, `bitcoin-qt`, `bitcoin-cli`). Both of these seem too invasive to introduce for 0.17.

  As a compromise, this PR makes it ignores those options, but still warn about it in the log file.

Tree-SHA512: dfddc771b91df3031a9c98d9f3292f8f4fcd1b97ebb7317b2f457e12d9f205dc63f42721302e7258dbb53f273d7cc041a65a0a9120972769555784e1f1cc9aef

src/bitcoind.cpp

@@ -96,7 +96,7 @@ static bool AppInit(int argc, char* argv[])
             fprintf(stderr, "Error: Specified data directory \"%s\" does not exist.\n", gArgs.GetArg("-datadir", "").c_str());
             return false;
         }
-        if (!gArgs.ReadConfigFiles(error)) {
+        if (!gArgs.ReadConfigFiles(error, true)) {
             fprintf(stderr, "Error reading configuration file: %s\n", error.c_str());
             return false;
         }

src/interfaces/node.cpp

@@ -53,7 +53,7 @@ class NodeImpl : public Node
     {
         return gArgs.ParseParameters(argc, argv, error);
     }
-    bool readConfigFiles(std::string& error) override { return gArgs.ReadConfigFiles(error); }
+    bool readConfigFiles(std::string& error) override { return gArgs.ReadConfigFiles(error, true); }
     bool softSetArg(const std::string& arg, const std::string& value) override { return gArgs.SoftSetArg(arg, value); }
     bool softSetBoolArg(const std::string& arg, bool value) override { return gArgs.SoftSetBoolArg(arg, value); }
     void selectParams(const std::string& network) override { SelectParams(network); }

src/util.cpp

@@ -859,9 +859,13 @@ bool ArgsManager::ReadConfigStream(std::istream& stream, std::string& error, boo
         }
 
         // Check that the arg is known
-        if (!IsArgKnown(strKey) && !ignore_invalid_keys) {
-            error = strprintf("Invalid configuration value %s", option.first.c_str());
-            return false;
+        if (!IsArgKnown(strKey)) {
+            if (!ignore_invalid_keys) {
+                error = strprintf("Invalid configuration value %s", option.first.c_str());
+                return false;
+            } else {
+                LogPrintf("Ignoring unknown configuration value %s\n", option.first);
+            }
         }
     }
     return true;