From 450c7d80f860b767366f1465ec760f7d50384397 Mon Sep 17 00:00:00 2001
From: Jakob Borg <jakob@nym.se>
Date: Thu, 11 Sep 2014 20:14:27 +0200
Subject: [PATCH] Don't crash on walk error (fixes #663)

---
 versioner/staggered.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/versioner/staggered.go b/versioner/staggered.go
index 5e1a66d8c..ac666de04 100644
--- a/versioner/staggered.go
+++ b/versioner/staggered.go
@@ -59,6 +59,9 @@ func versionExt(path string) string {
 // Rename versions with old version format
 func (v Staggered) renameOld() {
 	err := filepath.Walk(v.versionsPath, func(path string, f os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
 		if f.Mode().IsRegular() {
 			versionUnix, err := strconv.ParseInt(strings.Replace(filepath.Ext(path), ".v", "", 1), 10, 0)
 			if err == nil {