# HG changeset patch
# User Siddharth Agarwal <sid0@fb.com>
# Date 1393316422 28800
# Node ID aa8519daf037d63cb6fb8b9a7387dea4c6f08973
# Parent  1323058cc652fd68514e3a27f31be7301091490a
overlayrevlog: handle rev = 0 correctly

Previously we'd just test if gitrev was falsy, which it is if the rev returned
is 0, even though it shouldn't be. With this patch, test against None
explicitly.

This unmasks another bug: see next patch for a fix and a test.

diff --git a/hggit/overlay.py b/hggit/overlay.py
--- a/hggit/overlay.py
+++ b/hggit/overlay.py
@@ -187,7 +187,7 @@
 
     def parents(self, n):
         gitrev = self.repo.revmap.get(n)
-        if not gitrev:
+        if gitrev is None:
             # we've reached a revision we have
             return self.base.parents(n)
         commit = self.repo.handler.git.get_object(_maybehex(n))