From 3489e4e2d19ce9f894d7739b0a59fc019ada53e5 Mon Sep 17 00:00:00 2001
From: lilydjwg <lilydjwg@gmail.com>
Date: Wed, 5 Jul 2017 13:11:03 +0800
Subject: [PATCH] call fsync on saving

---
 nvchecker/core.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/nvchecker/core.py b/nvchecker/core.py
index a3af337..d369231 100644
--- a/nvchecker/core.py
+++ b/nvchecker/core.py
@@ -41,6 +41,9 @@ def safe_overwrite(fname, data, *, method='write', mode='w', encoding=None):
   # if not using "with", write can fail without exception
   with open(tmpname, mode, encoding=encoding) as f:
     getattr(f, method)(data)
+    # see also: https://thunk.org/tytso/blog/2009/03/15/dont-fear-the-fsync/
+    f.flush()
+    os.fsync(f.fileno())
   # if the above write failed (because disk is full etc), the old data should be kept
   os.rename(tmpname, fname)