From cedd2dbec99a338a1a3483aee72e06a0bd85ddc0 Mon Sep 17 00:00:00 2001
From: yeya24 <yb532204897@gmail.com>
Date: Thu, 24 Dec 2020 23:36:36 -0500
Subject: [PATCH] create output directory before backfilling

Signed-off-by: yeya24 <yb532204897@gmail.com>
---
 cmd/promtool/tsdb.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/promtool/tsdb.go b/cmd/promtool/tsdb.go
index b2ca5da92d..b8dd5bc6b4 100644
--- a/cmd/promtool/tsdb.go
+++ b/cmd/promtool/tsdb.go
@@ -621,5 +621,9 @@ func backfillOpenMetrics(path string, outputDir string) (err error) {
 		return err
 	}
 	defer inputFile.Close()
+
+	if err := os.MkdirAll(outputDir, 0777); err != nil {
+		return errors.Wrap(err, "create output dir")
+	}
 	return backfill(5000, inputFile.Bytes(), outputDir)
 }