fix: Detect device type (tape/changer) for TGT LUN mapping

dist/adastra-vtl-installer/web-ui/api.php

@@ -325,18 +325,36 @@ function addLun($params) {
         return;
     }
 
-    // Determine backing store type
+    // Determine backing store type and device type
     $bstypeParam = '';
+    $deviceTypeParam = '';
+    
     if (strpos($device, '/dev/sg') === 0) {
         $bstypeParam = '--bstype sg'; // Use sg (passthrough) for generic scsi devices
+        
+        // Detect specific device type (tape or changer)
+        $lsscsiOutput = [];
+        exec("sudo /usr/bin/lsscsi -g | grep " . escapeshellarg($device), $lsscsiOutput);
+        
+        if (!empty($lsscsiOutput)) {
+            $line = $lsscsiOutput[0];
+            if (strpos($line, 'mediumx') !== false) {
+                 $deviceTypeParam = '--device-type changer'; 
+            } elseif (strpos($line, 'tape') !== false) {
+                 $deviceTypeParam = '--device-type tape';
+            } else {
+                 $deviceTypeParam = '--device-type pt'; // Default to passthrough if unknown
+            }
+        }
     }
 
     $command = sprintf(
-        'sudo /usr/sbin/tgtadm --lld iscsi --mode logicalunit --op new --tid %d --lun %d --backing-store %s %s 2>&1',
+        'sudo /usr/sbin/tgtadm --lld iscsi --mode logicalunit --op new --tid %d --lun %d --backing-store %s %s %s 2>&1',
         $tid,
         $lun,
         escapeshellarg($device),
-        $bstypeParam
+        $bstypeParam,
+        $deviceTypeParam
     );
 
     $output = [];