From c60715e937e3773bbb8a114fc9b9c6577f8c5cb5 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 28 Mar 2017 13:08:13 +0200
Subject: [PATCH] Ignore broken "Deriver: unknown-deriver" fields in .narinfo

These were generated by a legacy tool.
---
 src/libstore/nar-info.cc | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/libstore/nar-info.cc b/src/libstore/nar-info.cc
index 201cac671..d1042c6de 100644
--- a/src/libstore/nar-info.cc
+++ b/src/libstore/nar-info.cc
@@ -59,9 +59,11 @@ NarInfo::NarInfo(const Store & store, const std::string & s, const std::string &
             }
         }
         else if (name == "Deriver") {
-            auto p = store.storeDir + "/" + value;
-            if (!store.isStorePath(p)) corrupt();
-            deriver = p;
+            if (value != "unknown-deriver") {
+                auto p = store.storeDir + "/" + value;
+                if (!store.isStorePath(p)) corrupt();
+                deriver = p;
+            }
         }
         else if (name == "System")
             system = value;