From b40aa66985699fbfeb3a62b3e2f67a69a4a0c39e Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sat, 11 Feb 2017 14:22:04 +0100
Subject: [PATCH] errors: Add method Wrapf

---
 src/restic/errors/wrap.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/restic/errors/wrap.go b/src/restic/errors/wrap.go
index 5906bd617..99d6e88ba 100644
--- a/src/restic/errors/wrap.go
+++ b/src/restic/errors/wrap.go
@@ -18,3 +18,7 @@ var Errorf = errors.Errorf
 // Wrap wraps an error retrieved from outside of restic. Wrapped so that this
 // package does not appear in the stack trace.
 var Wrap = errors.Wrap
+
+// Wrapf returns an error annotating err with the format specifier. If err is
+// nil, Wrapf returns nil.
+var Wrapf = errors.Wrapf