From add2ebdd5691be5cf60f7a0b42c45858ff2b44f8 Mon Sep 17 00:00:00 2001
From: beorn7 <beorn@soundcloud.com>
Date: Mon, 11 Jan 2016 18:05:36 +0100
Subject: [PATCH] Tolerate the lost+found directory in the data directory

---
 storage/local/persistence.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/storage/local/persistence.go b/storage/local/persistence.go
index d964d4ce8..ace58b6d9 100644
--- a/storage/local/persistence.go
+++ b/storage/local/persistence.go
@@ -162,7 +162,7 @@ func newPersistence(
 		if err != nil {
 			return nil, err
 		}
-		if len(fis) > 0 {
+		if len(fis) > 0 && !(len(fis) == 1 && fis[0].Name() == "lost+found" && fis[0].IsDir()) {
 			return nil, fmt.Errorf("could not detect storage version on disk, assuming version 0, need version %d - please wipe storage or run a version of Prometheus compatible with storage version 0", Version)
 		}
 		// Finally we can write our own version into a new version file.