From 168ace4476d1884803647e533a68031be981df0e Mon Sep 17 00:00:00 2001
From: Joonas Loppi <joonas+code@joonas.fi>
Date: Tue, 8 Oct 2024 12:15:04 +0300
Subject: [PATCH] `WriteFileAtomic`: add fsync

closes #27
---
 os/osutil/writefileatomic.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/os/osutil/writefileatomic.go b/os/osutil/writefileatomic.go
index b1821f8..f669895 100644
--- a/os/osutil/writefileatomic.go
+++ b/os/osutil/writefileatomic.go
@@ -70,6 +70,11 @@ func WriteFileAtomic(filename string, produce func(io.Writer) error, options ...
 			}
 		}
 
+		// `Close()` alone doesn't guarantee that the data has been successfully saved to disk.
+		if err := file.Sync(); err != nil {
+			return err
+		}
+
 		if err := file.Close(); err != nil { // double close intentional
 			return err
 		}