commit 3f0b85db1d4eedd3fdc9db0832e114215812d15c
Author: Miroslav Lichvar <mlichvar@redhat.com>
Date:   Wed Jan 10 15:55:05 2018 +0100

    don't remove timeout after each main context iteration
    
    With glib2-2.54.3 adding a new timeout causes g_main_context_iteration()
    to immediately return FALSE, which triggered an infinite loop removing
    and adding the timeout.
    
    Instead of removing the timeout after all iterations, use a flag to
    remove the timeout only when a valid call was handled.
    
    This fixes issue #4.

diff --git a/timedatex.c b/timedatex.c
index 28e562c..e671bb5 100644
--- a/timedatex.c
+++ b/timedatex.c
@@ -120,7 +120,7 @@ struct hwclock_call {
 
 /* Global variables */
 static GDBusProxy *systemd_proxy, *polkit_proxy;
-static gboolean main_quit, running_auth_checks;
+static gboolean main_quit, running_auth_checks, had_activity;
 static GArray *ntp_units;
 
 
@@ -948,6 +948,8 @@ static void handle_method_call(GDBusConnection *connection, const gchar *caller,
 	} else {
 		g_assert_not_reached();
 	}
+
+	had_activity = TRUE;
 }
 
 static const GDBusInterfaceVTable interface_vtable = {
@@ -1022,19 +1024,24 @@ int main(int argc, char **argv) {
 	read_ntp_units();
 
 	main_quit = FALSE;
+	had_activity = FALSE;
 
 	/* This is the main loop. Quit when idle for QUIT_TIMEOUT seconds. */
 
 	while (!main_quit) {
 		/* Add timeout when not waiting for an authorization check */
-		if (!running_auth_checks)
+		if (!timeout_id && !running_auth_checks)
 			timeout_id = g_timeout_add(QUIT_TIMEOUT * 1000, stop_main_loop, NULL);
 
 		g_main_context_iteration(g_main_context_default(), TRUE);
 
-		if (timeout_id)
-			g_source_remove(timeout_id);
-		timeout_id = 0;
+		if (had_activity || running_auth_checks) {
+			had_activity = FALSE;
+
+			if (timeout_id)
+				g_source_remove(timeout_id);
+			timeout_id = 0;
+		}
 	}
 
 	ret = 0;