[Commented On] D10544: revlog: highlight current incompatibility in `rewrite_sidedata`

[baymax (Baymax, Your Personal Patch-care Companion)]

baymax added a comment.
baymax updated this revision to Diff 27463.


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REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D10544?vs=27337&id=27463

BRANCH
  default

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D10544/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D10544

AFFECTED FILES
  mercurial/revlog.py

CHANGE DETAILS

diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -3082,6 +3082,18 @@
             # Nothing to generate or remove
             return
 
+        # changelog implement some "delayed" writing mechanism that assume that
+        # all index data is writen in append mode and is therefor incompatible
+        # with the seeked write done in this method. The use of such "delayed"
+        # writing will soon be removed for revlog version that support side
+        # data, so for now, we only keep this simple assert to highlight the
+        # situation.
+        delayed = getattr(self, '_delayed', False)
+        diverted = getattr(self, '_divert', False)
+        if delayed and not diverted:
+            msg = "cannot rewrite_sidedata of a delayed revlog"
+            raise error.ProgrammingError(msg)
+
         new_entries = []
         # append the new sidedata
         with self._datafp(b'a+') as fp:



To: marmoute, indygreg, #hg-reviewers
Cc: mercurial-patches
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