modules/s_conf: Add default_conf w/ console cmd to set item to default value.

modules/console.cc

@@ -832,6 +832,42 @@ console_cmd__conf__rehash(opt &out, const string_view &line)
 	return true;
 }
 
+bool
+console_cmd__conf__default(opt &out, const string_view &line)
+{
+	const params param{line, " ",
+	{
+		"prefix"
+	}};
+
+	using prototype = void (const string_view &);
+	static mods::import<prototype> default_conf
+	{
+		"s_conf", "default_conf"
+	};
+
+	string_view prefix
+	{
+		param.at("prefix", "*"_sv)
+	};
+
+	if(prefix == "*")
+		prefix = string_view{};
+
+	default_conf(prefix);
+
+	out << "Set runtime conf items"
+	    << (prefix? " with the prefix "_sv : string_view{})
+	    << (prefix? prefix : string_view{})
+	    << " to their default value."
+	    << std::endl
+	    << "Note: These values must be saved with the rehash command"
+	    << " to survive a restart/reload."
+	    << std::endl;
+
+	return true;
+}
+
 bool
 console_cmd__conf__reload(opt &out, const string_view &line)
 {

modules/s_conf.cc

@@ -10,6 +10,7 @@
 
 using namespace ircd;
 
+extern "C" void default_conf(const string_view &prefix);
 extern "C" void rehash_conf(const string_view &prefix, const bool &existing);
 extern "C" void reload_conf();
 extern "C" void refresh_conf();
@@ -290,6 +291,25 @@ rehash_conf(const string_view &prefix,
 	}
 }
 
+void
+default_conf(const string_view &prefix)
+{
+	for(const auto &p : conf::items)
+	{
+		const auto &key{p.first};
+		if(prefix && !startswith(key, prefix))
+			continue;
+
+		const auto &item{p.second}; assert(item);
+		const auto value
+		{
+			unquote(item->feature["default"])
+		};
+
+		conf::set(key, value);
+	}
+}
+
 void
 reload_conf()
 {