From 6f6bb1fdea9dcd4c6f6c0b8059b05d56ea7c16f3 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Mon, 15 Dec 2008 23:55:11 +0000
Subject: [PATCH] * Delete the chroot if it already exists (e.g. left over from
 an   interrupted build).

---
 src/libstore/build.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 54890afd1..f015b878c 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1678,6 +1678,7 @@ void DerivationGoal::startBuilder()
            to ensure that we can create hard-links to non-directory
            inputs in the fake Nix store in the chroot (see below). */
         chrootRootDir = drvPath + ".chroot";
+        if (pathExists(chrootRootDir)) deletePath(chrootRootDir);
 
         /* Clean up the chroot directory automatically. */
         autoDelChroot = boost::shared_ptr<AutoDelete>(new AutoDelete(chrootRootDir));