From a424ab0444540579d462856a9d7fb918ebd33603 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 2 Jun 2016 18:17:30 +0200
Subject: [PATCH] createTempDir(): Don't do a chown on Linux

It's not needed and can cause problems in a user namespace.
---
 src/libutil/util.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/libutil/util.cc b/src/libutil/util.cc
index 67558cc0b..788d01f59 100644
--- a/src/libutil/util.cc
+++ b/src/libutil/util.cc
@@ -384,6 +384,7 @@ Path createTempDir(const Path & tmpRoot, const Path & prefix,
         checkInterrupt();
         Path tmpDir = tempName(tmpRoot, prefix, includePid, counter);
         if (mkdir(tmpDir.c_str(), mode) == 0) {
+#if __FreeBSD__
             /* Explicitly set the group of the directory.  This is to
                work around around problems caused by BSD's group
                ownership semantics (directories inherit the group of
@@ -394,6 +395,7 @@ Path createTempDir(const Path & tmpRoot, const Path & prefix,
                have the setgid bit set on directories. */
             if (chown(tmpDir.c_str(), (uid_t) -1, getegid()) != 0)
                 throw SysError(format("setting group of directory ‘%1%’") % tmpDir);
+#endif
             return tmpDir;
         }
         if (errno != EEXIST)