Chrony support (#12488)

* initial chrony implementation

* remove unused import

* add testing data

* fix test data

* fix tests

Co-authored-by: Jellyfrog <Jellyfrog@users.noreply.github.com>

includes/html/functions.inc.php

@@ -1634,3 +1634,29 @@ function nfsen_live_dir($hostname)
         }
     }
 }
+
+/**
+ * Get the ZFS pools for a device... just requires the device ID
+ * an empty return means ZFS is not in use or there are currently no pools
+ * @param $device_id
+ * @return array
+ */
+function get_chrony_sources($device_id)
+{
+    $options = [
+        'filter' => [
+            'type' => ['=', 'chronyd'],
+        ],
+    ];
+
+    $component = new LibreNMS\Component();
+    $chronyd_cpnt = $component->getComponents($device_id, $options);
+
+    if (isset($chronyd_cpnt[$device_id])) {
+        $id = $component->getFirstComponentID($chronyd_cpnt, $device_id);
+
+        return json_decode($chronyd_cpnt[$device_id][$id]['sources']);
+    }
+
+    return [];
+}