From ff6867ab94cbe9ddcb4ba18d68a4a2dcb79b865d Mon Sep 17 00:00:00 2001
From: Daiderd Jordan <daiderd@gmail.com>
Date: Sun, 12 May 2019 15:53:40 +0200
Subject: [PATCH] build: move needsHashRewrite initialization to startBuilder

The value of useChroot is not set yet in the constructor, resulting in
hash rewriting being enabled in certain cases where it should not be.

Fixes #2801
---
 src/libstore/build.cc | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 91eb97dfb..30825add4 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -997,13 +997,6 @@ DerivationGoal::DerivationGoal(const Path & drvPath, const StringSet & wantedOut
     , wantedOutputs(wantedOutputs)
     , buildMode(buildMode)
 {
-#if __linux__
-    needsHashRewrite = !useChroot;
-#else
-    /* Darwin requires hash rewriting even when sandboxing is enabled. */
-    needsHashRewrite = true;
-#endif
-
     state = &DerivationGoal::getDerivation;
     name = (format("building of '%1%'") % drvPath).str();
     trace("created");
@@ -1852,6 +1845,13 @@ void DerivationGoal::startBuilder()
         #endif
     }
 
+#if __linux__
+    needsHashRewrite = !useChroot;
+#else
+    /* Darwin requires hash rewriting even when sandboxing is enabled. */
+    needsHashRewrite = true;
+#endif
+
     /* If `build-users-group' is not empty, then we have to build as
        one of the members of that group. */
     if (settings.buildUsersGroup != "" && getuid() == 0) {