services/updateserver/joomla.go

@@ -383,12 +383,22 @@ func GenerateJoomlaXML(ctx context.Context, repo *repo_model.Repository, require
 			infoURL = meta.SupportURL
 		}
 
-		// Joomla <client> element uses string values per the update server spec.
-		// Joomla's XML parser maps these to client_id internally (0/1).
-		client := "site"
+		// Joomla <client> element must match the client_id stored in #__extensions.
+		// Joomla's update finder matches by (element, type, client_id, folder) —
+		// a mismatch causes extension_id=0 and the update never shows.
+		//
+		// Joomla hardcodes client_id per extension type in the installer adapters:
+		//   component  → client_id=1 (ComponentAdapter.php:900)
+		//   package    → client_id=0 (PackageAdapter.php:548)
+		//   plugin     → client_id=0 (PluginAdapter.php:492)
+		//   library    → client_id=0 (LibraryAdapter.php:420)
+		//   file       → client_id=0 (FileAdapter.php:422)
+		//   module     → client_id from manifest (0=site, 1=admin)
+		//   template   → client_id from manifest (0=site, 1=admin)
+		client := "site" // default: client_id=0
 		switch extType {
-		case "package", "component", "library", "file":
-			client = "administrator"
+		case "component":
+			client = "administrator" // client_id=1
 		}
 
 		u := xmlUpdate{