diff -r a08bbdf839ae -r ad718271a9eb hgext/git/gitutil.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hgext/git/gitutil.py	Tue Feb 11 00:44:59 2020 -0500
@@ -0,0 +1,26 @@
+"""utilities to assist in working with pygit2"""
+from __future__ import absolute_import
+
+from mercurial.node import bin, hex, nullid
+
+from mercurial import pycompat
+
+
+def togitnode(n):
+    """Wrapper to convert a Mercurial binary node to a unicode hexlified node.
+
+    pygit2 and sqlite both need nodes as strings, not bytes.
+    """
+    assert len(n) == 20
+    return pycompat.sysstr(hex(n))
+
+
+def fromgitnode(n):
+    """Opposite of togitnode."""
+    assert len(n) == 40
+    if pycompat.ispy3:
+        return bin(n.encode('ascii'))
+    return bin(n)
+
+
+nullgit = togitnode(nullid)