From 3cac8734acb098488bd232bcee92099410d4d167 Mon Sep 17 00:00:00 2001
From: Will Dietz <w@wdtz.org>
Date: Sun, 25 Feb 2018 16:32:36 -0600
Subject: [PATCH] nix search: fix bug where we wrote to cache when shouldn't,
 breaking

This is exposed by the tests added previously,
and resolves the error reported in #1892:
"expected JSON value".
---
 src/nix/search.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nix/search.cc b/src/nix/search.cc
index 87cdb2d7e..1adde28cb 100644
--- a/src/nix/search.cc
+++ b/src/nix/search.cc
@@ -237,7 +237,7 @@ struct CmdSearch : SourceExprCommand, MixJSON
                     throw Error("error writing to %s", tmpFile);
             }
 
-            if (rename(tmpFile.c_str(), jsonCacheFileName.c_str()) == -1)
+            if (writeCache && rename(tmpFile.c_str(), jsonCacheFileName.c_str()) == -1)
                 throw SysError("cannot rename '%s' to '%s'", tmpFile, jsonCacheFileName);
         }
     }