From 76e297d64f76f5054a2aafe752d406c81ab3fada Mon Sep 17 00:00:00 2001
From: chrislu <chris.lu@gmail.com>
Date: Fri, 4 Feb 2022 11:14:04 -0800
Subject: [PATCH] sync call to write file, avoid vif loading error

fix https://github.com/chrislusf/seaweedfs/issues/2633
---
 weed/storage/volume_info/volume_info.go |  2 +-
 weed/util/file_util.go                  | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/weed/storage/volume_info/volume_info.go b/weed/storage/volume_info/volume_info.go
index fa906e1d4..aa815970c 100644
--- a/weed/storage/volume_info/volume_info.go
+++ b/weed/storage/volume_info/volume_info.go
@@ -75,7 +75,7 @@ func SaveVolumeInfo(fileName string, volumeInfo *volume_server_pb.VolumeInfo) er
 		return fmt.Errorf("marshal to %s: %v", fileName, marshalErr)
 	}
 
-	writeErr := os.WriteFile(fileName, []byte(text), 0755)
+	writeErr := util.WriteFile(fileName, []byte(text), 0755)
 	if writeErr != nil {
 		return fmt.Errorf("fail to write %s : %v", fileName, writeErr)
 	}
diff --git a/weed/util/file_util.go b/weed/util/file_util.go
index f9cc4f70b..6155d18e1 100644
--- a/weed/util/file_util.go
+++ b/weed/util/file_util.go
@@ -95,3 +95,20 @@ func FileNameBase(filename string) string {
 	}
 	return filename[:lastDotIndex]
 }
+
+// Copied from os.WriteFile(), adding file sync.
+// see https://github.com/golang/go/issues/20599
+func WriteFile(name string, data []byte, perm os.FileMode) error {
+	f, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
+	if err != nil {
+		return err
+	}
+	_, err = f.Write(data)
+	if err1 := f.Sync(); err1 != nil && err == nil {
+		err = err1
+	}
+	if err1 := f.Close(); err1 != nil && err == nil {
+		err = err1
+	}
+	return err
+}