From d879d9fae405131a605860260f034d0d4dcc86e8 Mon Sep 17 00:00:00 2001
From: RockAndSka <address@hidden>
Date: Sun, 11 Mar 2018 20:48:34 +0100
Subject: [PATCH] Add writable /var/tmp to chroot

---
 nix/libstore/build.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index d68e8b2..ad08b3a 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1849,6 +1849,11 @@ void DerivationGoal::startBuilder()
         createDirs(chrootTmpDir);
         chmod_(chrootTmpDir, 01777);
 
+        /* Create a writable /var/tmp in the chroot. */
+        Path chrootVarTmpDir = chrootRootDir + "/var/tmp";
+        createDirs(chrootVarTmpDir);
+        chmod_(chrootVarTmpDir, 01777);
+
         /* Create a /etc/passwd with entries for the build user and the
            nobody account.  The latter is kind of a hack to support
            Samba-in-QEMU. */
-- 
2.7.4