[PATCH 1 of 4 for-reference] obsstore: add a flag for sha256 hashes

Pierre-Yves David pierre-yves.david at ens-lyon.org
Fri Oct 10 18:25:05 CDT 2014


# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1412977384 18000
#      Fri Oct 10 16:43:04 2014 -0500
# Node ID b078e4dc9f9abfcf30c001b60235cdc53e447920
# Parent  fd759142c6e5487c0f8d65847c9f29f35969c66c
obsstore: add a flag for sha256 hashes

We add flag to inform that the marker is using sha256 hashes. As format 0 is not
able to handle sha256 hashes (32 bytes long), we plain crash if we even attempt to
encode a sha256 with it.

diff --git a/mercurial/obsolete.py b/mercurial/obsolete.py
--- a/mercurial/obsolete.py
+++ b/mercurial/obsolete.py
@@ -110,10 +110,11 @@ from i18n import _
 # as bumped too, we add the `bumpedfix` flag to the marker. <A', (Ad,)>.
 # This flag mean that the successors express the changes between the public and
 # bumped version and fix the situation, breaking the transitivity of
 # "bumped" here.
 bumpedfix = 1
+usingsha256 = 2
 
 ## Parsing and writing of version "0"
 #
 # The header is followed by the markers. Each marker is made of:
 #
@@ -191,10 +192,12 @@ def _fm0readmarkers(data, off=0):
 
         yield (pre, sucs, flags, metadata, date, parents)
 
 def _fm0encodeonemarker(marker):
     pre, sucs, flags, metadata, date, parents = marker
+    if flags & usingsha256:
+        raise util.Abort(_('cannot handle sha256 with old obsstore format'))
     metadata = dict(metadata)
     metadata['date'] = '%d %i' % date
     if parents is not None:
         if not parents:
             # mark that we explicitly recorded no parents


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