307/376: Don't create unnecessary substitution goals for derivations

[Ludovic Court�s]

civodul pushed a commit to tag 1.8
in repository guix.

commit 9e3389c3378df026dcbf66adef8e52002c7b9d2a
Author: Eelco Dolstra <eelco.dols...@logicblox.com>
Date:   Mon Nov 24 16:44:35 2014 +0100

    Don't create unnecessary substitution goals for derivations
---
 src/libstore/build.cc |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 24576f6..72694cf 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -924,6 +924,11 @@ void DerivationGoal::init()
     /* The first thing to do is to make sure that the derivation
        exists.  If it doesn't, it may be created through a
        substitute. */
+    if (buildMode == bmNormal && worker.store.isValidPath(drvPath)) {
+        haveDerivation();
+        return;
+    }
+
     addWaitee(worker.makeSubstitutionGoal(drvPath));
 
     state = &DerivationGoal::haveDerivation;