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-rw-r--r--src/libstore/build.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 527d7ac42..632982ecd 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2161,7 +2161,7 @@ void DerivationGoal::startBuilder()
if (needsHashRewrite()) {
if (pathExists(homeDir))
- throw Error(format("directory '%1%' exists; please remove it") % homeDir);
+ throw Error(format("home directory '%1%' exists; please remove it to assure purity of builds without sandboxing") % homeDir);
/* We're not doing a chroot build, but we have some valid
output paths. Since we can't just overwrite or delete