From 5991209c2dce3816db8663e24d69485b5e0874ad Mon Sep 17 00:00:00 2001
From: Anthony Romano <anthony.romano@coreos.com>
Date: Sat, 2 Jul 2016 12:14:37 -0700
Subject: [PATCH] wal: release wal locks before renaming directory on init

Fixes #5852
---
 wal/wal.go | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/wal/wal.go b/wal/wal.go
index d924a458f..e9ca81e2a 100644
--- a/wal/wal.go
+++ b/wal/wal.go
@@ -129,15 +129,22 @@ func Create(dirpath string, metadata []byte) (*WAL, error) {
 		return nil, err
 	}
 
-	if err := os.RemoveAll(dirpath); err != nil {
-		return nil, err
-	}
+	// rename of directory with locked files doesn't work on windows; close
+	// the WAL to release the locks so the directory can be renamed
+	w.Close()
 	if err := os.Rename(tmpdirpath, dirpath); err != nil {
 		return nil, err
 	}
-
-	w.fp = newFilePipeline(w.dir, segmentSizeBytes)
-	return w, nil
+	// reopen and relock
+	newWAL, oerr := Open(dirpath, walpb.Snapshot{})
+	if oerr != nil {
+		return nil, oerr
+	}
+	if _, _, _, err := newWAL.ReadAll(); err != nil {
+		newWAL.Close()
+		return nil, err
+	}
+	return newWAL, nil
 }
 
 // Open opens the WAL at the given snap.