D7892: nodemap: never read more than the expected data amount

[marmoute (Pierre-Yves David)]

marmoute updated this revision to Diff 19800.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST UPDATE
  https://phab.mercurial-scm.org/D7892?vs=19773&id=19800

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7892/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7892

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
@@ -45,7 +45,12 @@
     docket.data_unused = data_unused
 
     filename = _rawdata_filepath(revlog, docket)
-    return docket, revlog.opener.tryread(filename)
+    data = revlog.opener.tryread(filename)
+    if len(data) < data_length:
+        return None
+    elif len(data) > data_length:
+        data = data[:data_length]
+    return docket, data
 
 
 def setup_persistent_nodemap(tr, revlog):



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