D7891: nodemap: write new data from the expected current data length

[marmoute (Pierre-Yves David)]

marmoute updated this revision to Diff 19799.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D7891?vs=19772&id=19799

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7891/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7891

AFFECTED FILES
  mercurial/revlogutils/nodemap.py

CHANGE DETAILS

diff --git a/mercurial/revlogutils/nodemap.py b/mercurial/revlogutils/nodemap.py
--- a/mercurial/revlogutils/nodemap.py
+++ b/mercurial/revlogutils/nodemap.py
@@ -92,7 +92,8 @@
             datafile = _rawdata_filepath(revlog, target_docket)
             # EXP-TODO: if this is a cache, this should use a cache vfs, not a
             # store vfs
-            with revlog.opener(datafile, b'a') as fd:
+            with revlog.opener(datafile, b'r+') as fd:
+                fd.seek(target_docket.data_length)
                 fd.write(data)
             target_docket.data_length += len(data)
             target_docket.data_unused += data_changed_count



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