make sure that plugin arg includes the double colon. (#2878)

Signed-off-by: Tomoya Fujita <[email protected]>

Author: fujitatomoya

rclcpp_components/cmake/rclcpp_components_register_node.cmake

@@ -57,6 +57,9 @@ macro(rclcpp_components_register_node target)
     message(STATUS "Setting executor non-default value ${executor}")
   endif()
 
+  if("${ARGS_PLUGIN}" MATCHES "^[^:]+:[^:]+$")
+    message(FATAL_ERROR "PLUGIN argument '${ARGS_PLUGIN}' appears to be incorrect. (e.g., 'package_name::ClassName').")
+  endif()
   set(component ${ARGS_PLUGIN})
   set(node ${ARGS_EXECUTABLE})
   _rclcpp_components_register_package_hook()