From b521612042ec87103088b45b7b5dfee3bb8dc732 Mon Sep 17 00:00:00 2001
From: johncming <johncming@yahoo.com>
Date: Fri, 14 Aug 2020 17:45:08 +0800
Subject: [PATCH] tsdb: simplify code. (#7792)

Signed-off-by: johncming <johncming@yahoo.com>
---
 tsdb/db.go | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/tsdb/db.go b/tsdb/db.go
index e6772b9f3..b045fa155 100644
--- a/tsdb/db.go
+++ b/tsdb/db.go
@@ -572,8 +572,11 @@ func open(dir string, l log.Logger, r prometheus.Registerer, opts *Options, rngs
 	if err := repairBadIndexVersion(l, dir); err != nil {
 		return nil, errors.Wrap(err, "repair bad index version")
 	}
+
+	walDir := filepath.Join(dir, "wal")
+
 	// Migrate old WAL if one exists.
-	if err := MigrateWAL(l, filepath.Join(dir, "wal")); err != nil {
+	if err := MigrateWAL(l, walDir); err != nil {
 		return nil, errors.Wrap(err, "migrate WAL")
 	}
 	// Remove garbage, tmp blocks.
@@ -618,7 +621,6 @@ func open(dir string, l log.Logger, r prometheus.Registerer, opts *Options, rngs
 
 	var wlog *wal.WAL
 	segmentSize := wal.DefaultSegmentSize
-	walDir := filepath.Join(dir, "wal")
 	// Wal is enabled.
 	if opts.WALSegmentSize >= 0 {
 		// Wal is set to a custom size.