pack.py: add 'cwlVersion' in pack dict, if only single item exists

Author: manu-chroma

cwltool/main.py

@@ -655,6 +655,7 @@ def loadref(b, u):
 def print_pack(document_loader, processobj, uri, metadata):
     # type: (Loader, Union[Dict[Text, Any], List[Dict[Text, Any]]], Text, Dict[Text, Any]) -> str
     packed = pack(document_loader, processobj, uri, metadata)
+
     if len(packed["$graph"]) > 1:
         return json.dumps(packed, indent=4)
     else:

cwltool/pack.py

@@ -157,4 +157,9 @@ def rewrite_id(r, mainuri):
 
     import_embed(packed, set())
 
+    if len(packed["$graph"]) == 1:
+        # duplicate 'cwlVersion' inside $graph when there is a single item
+        # because we're printing contents inside '$graph' rather than whole dict
+        packed["$graph"][0]["cwlVersion"] = packed["cwlVersion"]
+
     return packed