From a010c0ae0545babccb054f8f726b864b7cff0dcb Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Wed, 13 May 2015 18:03:22 +0200
Subject: [PATCH] =?UTF-8?q?Fix=20"error:=20deriver=20of=20path=20=E2=80=98?=
 =?UTF-8?q?=E2=80=99=20is=20not=20known"?=
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---
 src/nix-store/nix-store.cc | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/nix-store/nix-store.cc b/src/nix-store/nix-store.cc
index 60080f253..506c1a397 100644
--- a/src/nix-store/nix-store.cc
+++ b/src/nix-store/nix-store.cc
@@ -49,12 +49,11 @@ LocalStore & ensureLocalStore()
 
 static Path useDeriver(Path path)
 {
-    if (!isDerivation(path)) {
-        path = store->queryDeriver(path);
-        if (path == "")
-            throw Error(format("deriver of path ‘%1%’ is not known") % path);
-    }
-    return path;
+    if (isDerivation(path)) return path;
+    Path drvPath = store->queryDeriver(path);
+    if (drvPath == "")
+        throw Error(format("deriver of path ‘%1%’ is not known") % path);
+    return drvPath;
 }