X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/5b3187552676947ee74e4b652e7a04d3d9b9a3a4..9bccc21498bab7e1300af17c5844f868f119bb9c:/sdk/python/arvados/collection.py

diff --git a/sdk/python/arvados/collection.py b/sdk/python/arvados/collection.py
index 38e794c24a..8450bd1ca0 100644
--- a/sdk/python/arvados/collection.py
+++ b/sdk/python/arvados/collection.py
@@ -474,6 +474,7 @@ class ResumableCollectionWriter(CollectionWriter):
 ADD = "add"
 DEL = "del"
 MOD = "mod"
+TOK = "tok"
 FILE = "file"
 COLLECTION = "collection"
 
@@ -986,6 +987,8 @@ class RichCollectionBase(CollectionBase):
                     changes.extend(self[k].diff(end_collection[k], os.path.join(prefix, k), holding_collection))
                 elif end_collection[k] != self[k]:
                     changes.append((MOD, os.path.join(prefix, k), self[k].clone(holding_collection, ""), end_collection[k].clone(holding_collection, "")))
+                else:
+                    changes.append((TOK, os.path.join(prefix, k), self[k].clone(holding_collection, ""), end_collection[k].clone(holding_collection, "")))
             else:
                 changes.append((ADD, os.path.join(prefix, k), end_collection[k].clone(holding_collection, "")))
         return changes
@@ -1016,7 +1019,7 @@ class RichCollectionBase(CollectionBase):
                     # There is already local file and it is different:
                     # save change to conflict file.
                     self.copy(initial, conflictpath)
-            elif event_type == MOD:
+            elif event_type == MOD or event_type == TOK:
                 final = change[3]
                 if local == initial:
                     # Local matches the "initial" item so it has not
@@ -1211,8 +1214,12 @@ class Collection(RichCollectionBase):
             if self._manifest_locator is None:
                 raise errors.ArgumentError("`other` is None but collection does not have a manifest_locator uuid")
             response = self._my_api().collections().get(uuid=self._manifest_locator).execute(num_retries=num_retries)
-            if self.known_past_version((response.get("modified_at"), response.get("portable_data_hash"))):
-                # We've merged this record this before.  Don't do anything.
+            if (self.known_past_version((response.get("modified_at"), response.get("portable_data_hash"))) and
+                response.get("portable_data_hash") != self.portable_data_hash()):
+                # The record on the server is different from our current one, but we've seen it before,
+                # so ignore it because it's already been merged.
+                # However, if it's the same as our current record, proceed with the update, because we want to update
+                # our tokens.
                 return
             else:
                 self._past_versions.add((response.get("modified_at"), response.get("portable_data_hash")))