rtkit-daemon: Don't log debug messages by default

The rtkit-daemon service is a lot more verbose than other services
when it doesn't have anything to do. Stop logging the debug messages
by default to avoid flooding the system log.

This addresses issue #22.

rtkit-daemon.c

@@ -154,6 +154,9 @@ static bool canary_demote_unknown = FALSE;
 /* Log to stderr? */
 static bool log_stderr = FALSE;
 
+/* Also log debugging messages? */
+static bool log_debug = FALSE;
+
 /* Scheduling policy to use */
 static int sched_policy = SCHED_RR;
 
@@ -1876,6 +1879,7 @@ enum {
         ARG_CANARY_DEMOTE_UNKNOWN,
         ARG_CANARY_REFUSE_SEC,
         ARG_STDERR,
+        ARG_DEBUG,
         ARG_INTROSPECT
 };
 
@@ -1905,6 +1909,7 @@ static const struct option long_options[] = {
     { "canary-demote-unknown",       no_argument,       0, ARG_CANARY_DEMOTE_UNKNOWN },
     { "canary-refuse-sec",           required_argument, 0, ARG_CANARY_REFUSE_SEC },
     { "stderr",                      no_argument,       0, ARG_STDERR },
+    { "debug",                       no_argument,       0, ARG_DEBUG },
     { "introspect",                  no_argument,       0, ARG_INTROSPECT },
     { NULL, 0, 0, 0}
 };
@@ -1933,6 +1938,7 @@ static void show_help(const char *exe) {
                "      --version                       Show version\n\n"
                "OPTIONS:\n"
                "      --stderr                        Log to STDERR in addition to syslog\n"
+               "      --debug                         Also log debugging mssages\n"
                "      --user-name=USER                Run daemon as user (%s)\n\n"
                "      --scheduling-policy=(RR|FIFO)   Choose scheduling policy (%s)\n"
                "      --our-realtime-priority=[%i..%i] Realtime priority for the daemon (%u)\n"
@@ -2222,6 +2228,10 @@ static int parse_command_line(int argc, char *argv[], int *ret) {
                                 log_stderr = TRUE;
                                 break;
 
+                        case ARG_DEBUG:
+                                log_debug = TRUE;
+                                break;
+
                         case ARG_INTROSPECT:
                                 fputs(introspect_xml, stdout);
                                 *ret = 0;
@@ -2251,6 +2261,9 @@ static int parse_command_line(int argc, char *argv[], int *ret) {
                 return -1;
         }
 
+	if (!log_debug)
+                setlogmask(LOG_UPTO(LOG_INFO));
+
         assert(our_realtime_priority >= (unsigned) sched_get_priority_min(sched_policy));
         assert(our_realtime_priority <= (unsigned) sched_get_priority_max(sched_policy));