From eee18f88dd83be2810cd7090738e5949745dbefa Mon Sep 17 00:00:00 2001
From: volth <volth@volth.com>
Date: Mon, 12 Oct 2020 16:06:38 +0000
Subject: [PATCH] Handle amount of disk space saved by hard linking being
 negative

Fixes bogus messages like "currently hard linking saves 17592186044416.00 MiB".
---
 src/libstore/gc.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index 7a04b2f89..bc692ca42 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -683,7 +683,7 @@ void LocalStore::removeUnusedLinks(const GCState & state)
     struct stat st;
     if (stat(linksDir.c_str(), &st) == -1)
         throw SysError("statting '%1%'", linksDir);
-    auto overhead = st.st_blocks * 512ULL;
+    int64_t overhead = st.st_blocks * 512ULL;
 
     printInfo("note: currently hard linking saves %.2f MiB",
         ((unsharedSize - actualSize - overhead) / (1024.0 * 1024.0)));