createTempDir(): Don't do a chown on Linux
It's not needed and can cause problems in a user namespace.
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		|  | @ -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) | ||||
|  |  | |||
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