diff --git a/lib/utils/mu-test-utils.hh b/lib/utils/mu-test-utils.hh
index b35beb07..e1f3d0c7 100644
--- a/lib/utils/mu-test-utils.hh
+++ b/lib/utils/mu-test-utils.hh
@@ -130,12 +130,17 @@ struct TempDir {
 	 *
 	 * @return the path.
 	 */
-	const std::string& path() {return path_; }
+	const std::string& path() const { return path_; }
 private:
 	std::string path_;
 	const bool autodelete_;
 };
 
+static inline auto format_as(const TempDir& td) {
+	return td.path();
+}
+
+
 /**
  * Temporary (RAII) timezone
  */
diff --git a/lib/utils/mu-utils-file.cc b/lib/utils/mu-utils-file.cc
index a22e5040..b8966f77 100644
--- a/lib/utils/mu-utils-file.cc
+++ b/lib/utils/mu-utils-file.cc
@@ -289,6 +289,13 @@ Mu::run_command(std::initializer_list<std::string> args)
 		argvec.push_back(g_strdup(arg.c_str()));
 	argvec.push_back({});
 
+	{
+		std::vector<std::string> qargs{};
+		for(auto&& arg: args)
+			qargs.emplace_back("'" + arg + "'");
+		mu_debug("run-command: {}", fmt::join(qargs, "  "));
+	}
+
 	GError *err{};
 	int wait_status{};
 	gchar *std_out{}, *std_err{};
diff --git a/lib/utils/mu-utils.hh b/lib/utils/mu-utils.hh
index be2afe94..73f32dfd 100644
--- a/lib/utils/mu-utils.hh
+++ b/lib/utils/mu-utils.hh
@@ -145,7 +145,7 @@ auto mu_join(Range&& range, std::string_view sepa) {
 	return fmt::join(std::forward<Range>(range), sepa);
 }
 
-template <typename T>
+template <typename T=::time_t>
 std::tm mu_time(T t={}, bool use_utc=false) {
 	::time_t tt{static_cast<::time_t>(t)};
 	return use_utc ? fmt::gmtime(tt) : fmt::localtime(tt);