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revlog: do not search for delta for empty content
authorBoris Feld <boris.feld@octobus.net>
Fri, 27 Jul 2018 14:37:31 +0200
changeset 39085 dbb3e9e44fce
parent 39084 152ae0f84f9a
child 39086 64ddad2f26bb
revlog: do not search for delta for empty content We won't find any useful base to store an empty text. So we should not even try to.
mercurial/revlog.py file | annotate | diff | comparison | revisions 
--- a/mercurial/revlog.py	Tue Aug 14 13:44:13 2018 -0700
+++ b/mercurial/revlog.py	Fri Jul 27 14:37:31 2018 +0200
@@ -738,6 +738,9 @@
         Returns the first acceptable candidate revision, as ordered by
         _getcandidaterevs
         """
+        if not revinfo.textlen:
+            return None # empty file do not need delta
+
         cachedelta = revinfo.cachedelta
         p1 = revinfo.p1
         p2 = revinfo.p2
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