From 62fe5c4a22453c763e967f04bda062df8241c487 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Wed, 11 Aug 2004 19:03:13 +0000
Subject: [PATCH] * The predecessor of a successor need not be present.  This
 in   particular happens on distributed builds or when using push/pull.

---
 src/libstore/normalise.cc | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/libstore/normalise.cc b/src/libstore/normalise.cc
index 309c1777f7..b3282b146b 100644
--- a/src/libstore/normalise.cc
+++ b/src/libstore/normalise.cc
@@ -297,11 +297,13 @@ const char * * strings2CharPtrs(const Strings & ss)
 /* Should only be called after an expression has been normalised. */
 Path queryNormalForm(const Path & nePath)
 {
-    StoreExpr ne = storeExprFromPath(nePath);
-    if (ne.type == StoreExpr::neClosure) return nePath;
     Path nfPath;
-    if (!querySuccessor(nePath, nfPath)) abort();
-    return nfPath;
+    if (querySuccessor(nePath, nfPath)) return nfPath;
+    /* If there is no successor, than nePath must be a normal form
+       itself. */
+    StoreExpr ne = storeExprFromPath(nePath);
+    if (ne.type != StoreExpr::neClosure) abort();
+    return nePath;
 }