diff -r 2e464925f662 -r ec54b3d2af0b hgext/git/gitutil.py
--- a/hgext/git/gitutil.py	Mon Mar 09 12:53:21 2020 -0700
+++ b/hgext/git/gitutil.py	Mon Mar 09 11:18:33 2020 -0700
@@ -5,6 +5,20 @@
 
 from mercurial import pycompat
 
+pygit2_module = None
+
+
+def get_pygit2():
+    global pygit2_module
+    if pygit2_module is None:
+        try:
+            import pygit2 as pygit2_module
+
+            pygit2_module.InvalidSpecError
+        except (ImportError, AttributeError):
+            pass
+    return pygit2_module
+
 
 def togitnode(n):
     """Wrapper to convert a Mercurial binary node to a unicode hexlified node.