feature: Added ZFS support for FreeBSD (#7938)

* add the ZFS graphs

* And now the ZFS non-graph stuff.

Still need to move it over to using JSON.

* Now uses JSON.

* use stripslashes as SNMPD loves to slash up the JSON

* Document ZFS.

* very minor formatting cleanup

* minor formatting cleanup and remove a bit of code from when I was mucking around debugging it all

html/includes/functions.inc.php

@@ -128,10 +128,13 @@ function nicecase($item)
 
         case 'pi-hole':
             return 'Pi-hole';
-            
+
         case 'freeradius':
             return 'FreeRADIUS';
 
+        case 'zfs':
+            return 'ZFS';
+
         default:
             return ucfirst($item);
     }
@@ -1663,3 +1666,28 @@ function generate_stacked_graphs($transparency = '88')
         return array('transparency' => '', 'stacked' => '-1');
     }
 }
+
+/**
+ * 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 $device_id
+ * @return array
+ */
+function get_zfs_pools($device_id)
+{
+    $options=array(
+        'filter' => array(
+             'type' => array('=', 'zfs'),
+        ),
+    );
+
+    $component=new LibreNMS\Component();
+    $zfsc=$component->getComponents($device_id, $options);
+
+    if (isset($zfsc[$device_id])) {
+        $id = $component->getFirstComponentID($zfsc, $device_id);
+        return json_decode($zfsc[$device_id][$id]['pools']);
+    }
+
+    return array();
+}