nuke: validator exception legacy

openpype/hosts/nuke/plugins/publish/help/validate_write_nodes.xml

@@ -3,16 +3,30 @@
     <error id="main">
         <title>Knobs values</title>
         <description>
-## Invalid node's knobs values
+            ## Invalid node's knobs values
 
-Following write node knobs needs to be repaired:
+            Following write node knobs needs to be repaired:
 
-{xml_msg}
+            {xml_msg}
 
-### How to repair?
+            ### How to repair?
 
-1. Use Repair button.
-2. Hit Reload button on the publisher.
+            1. Use Repair button.
+            2. Hit Reload button on the publisher.
+        </description>
+    </error>
+    <error id="legacy">
+        <title>Legacy knob types</title>
+        <description>
+            ## Knobs are in obsolete configuration
+
+            Settings needs to be fixed.
+
+            ### How to repair?
+
+            Contact your supervisor or fix it in project settings at
+            'project_settings/nuke/imageio/nodes/requiredNodes' at knobs.
+            Each '__legacy__' type has to be defined accordingly to its type.
         </description>
     </error>
 </root>

openpype/hosts/nuke/plugins/publish/validate_write_nodes.py

@@ -77,14 +77,31 @@ class ValidateNukeWriteNode(
         if write_node is None:
             return
 
-        correct_data = get_write_node_template_attr(write_group_node)
+        check_knobs = get_write_node_template_attr(write_group_node)
 
         check = []
         self.log.debug("__ write_node: {}".format(
             write_node
         ))
+        self.log.debug("__ check_knobs: {}".format(
+            check_knobs
+        ))
 
-        for key, value in correct_data.items():
+        for knob_data in check_knobs:
+            if (
+                "type" not in knob_data
+                or knob_data["type"] == "__legacy__"
+            ):
+                PublishXmlValidationError(
+                    self, (
+                        "Please update data in settings 'project_settings"
+                        "/nuke/imageio/nodes/requiredNodes'"
+                    ),
+                    key="legacy"
+                )
+
+            key = knob_data["name"]
+            value = knob_data["value"]
             node_value = write_node[key].value()
 
             # fix type differences