Added validate_keys_none validator

examples/foobar/pyblish/plugins/validate_keys_none.py

@@ -0,0 +1,29 @@
+import pyblish.api
+from maya import cmds
+
+
+class ValidateKeysNone(pyblish.api.Validator):
+    """ Validates that none of the nodes in the instance have any keys """
+    families = ['model', 'layout']
+    hosts = ['maya']
+    category = 'cleanup'
+    optional = True
+    version = (0, 1, 0)
+
+    def process_instance(self, instance):
+        """Process all the nodes in the instance """
+
+        # quick check
+        any_keys = cmds.keyframe(instance, q=1, selected=False)
+        if not any_keys:
+            return
+
+        # find each individual node with keys
+        invalid = []
+        for node in instance:
+            keys = cmds.keyframe(node, q=1, selected=False)
+            if keys:
+                invalid.append(node)
+
+        if invalid:
+            raise ValueError("Nodes with keys found: {0}".format(invalid))