Suppress warnings about missing led configuration toggles

Since custom led patterns can be added via ini-files and enable/disable
configuration deals with default patterns only, mce should not complain
about missing led configuration keys by default.

[mce] Suppress warnings about missing led configuration toggles. Fixes JB#20539

mce-gconf.c

@@ -30,6 +30,31 @@ static gboolean gconf_disabled = FALSE;
 /** List of GConf notifiers */
 static GSList *gconf_notifiers = NULL;
 
+/** Check if gconf-key exists
+ *
+ * @param key Name of value
+ *
+ * @return TRUE if value exits, FALSE otherwise
+ */
+gboolean mce_gconf_has_key(const gchar *const key)
+{
+	gboolean    res = FALSE;
+	GConfValue *val = 0;
+	GError     *err = 0;
+
+	if( gconf_disabled )
+		goto EXIT;
+
+	val = gconf_client_get(gconf_client, key, &err);
+	res = (val != 0);
+
+EXIT:
+	g_clear_error(&err);
+	gconf_value_free(val);
+
+	return res;
+}
+
 /**
  * Set an integer GConf key to the specified value
  *

mce-gconf.h

@@ -23,6 +23,7 @@
 
 #include "builtin-gconf.h"
 
+gboolean mce_gconf_has_key(const gchar *const key);
 gboolean mce_gconf_set_int(const gchar *const key, const gint value);
 gboolean mce_gconf_get_bool(const gchar *const key, gboolean *value);
 gboolean mce_gconf_get_int(const gchar *const key, gint *value);

modules/led.c

@@ -1823,11 +1823,20 @@ static gboolean pattern_get_enabled(const gchar *const patternname,
 	gchar *path = gconf_concat_dir_and_key(MCE_GCONF_LED_PATH,
 					       patternname);
 
+	/* Since custom led patterns do not have persistent toggles
+	 * in configuration, avoid complaining about missing keys
+	 * on default verbosity level. */
+	if( !mce_gconf_has_key(path) ) {
+		mce_log(LL_INFO, "missing led config entry: %s", path);
+		goto EXIT;
+	}
+
 	/* Since we've set a default, error handling is unnecessary */
 	mce_gconf_notifier_add(MCE_GCONF_LED_PATH, path,
 			       led_gconf_cb, gconf_cb_id);
 	mce_gconf_get_bool(path, &retval);
 
+EXIT:
 	g_free(path);
 
 	return retval;