From e12cf82782d9a8c799c9dfff347866eca95e9f4a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Mon, 24 Aug 2015 11:13:31 +0200
Subject: [PATCH] Prevent .chroot from being GC'ed when using
 LocalStore::buildDerivation()

Fixes #616.
---
 src/libstore/build.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 1eb7e806c..2e3a22218 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -911,6 +911,10 @@ DerivationGoal::DerivationGoal(const Path & drvPath, const BasicDerivation & drv
     state = &DerivationGoal::haveDerivation;
     name = (format("building of %1%") % showPaths(outputPaths(drv))).str();
     trace("created");
+
+    /* Prevent the .chroot directory from being
+       garbage-collected. (See isActiveTempFile() in gc.cc.) */
+    worker.store.addTempRoot(drvPath);
 }