From 1466751256580d8b0e6eea46a8028dcab9742f6b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Fri, 15 Jan 2021 22:13:00 +0100
Subject: Storage: do not try to replace Head without change

---
 src/storage.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/storage.cpp b/src/storage.cpp
index b5bff8c..45caadb 100644
--- a/src/storage.cpp
+++ b/src/storage.cpp
@@ -660,7 +660,7 @@ bool Storage::replaceHead(UUID type, UUID id, const Ref & old, const Ref & ref)
 optional<Ref> Storage::updateHead(UUID type, UUID id, const Ref & old, const std::function<Ref(const Ref &)> & f)
 {
 	Ref r = f(old);
-	if (replaceHead(type, id, old, r))
+	if (r.digest() == old.digest() || replaceHead(type, id, old, r))
 		return r;
 
 	if (auto cur = old.storage().headRef(type, id))
-- 
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