Description of problem:

tar suffers from problems with race conditions in the case of directory creation due to the usual

   if (not_exists(dir) && mkdir(dir))
      fail

logic.

Fix was incorporated upstream with

Commit: 9447e799ab5faa6e8be43de4000e1061e0879242 [9447e79]
Parents: 502abd93bd
Author: Paul Eggert <eggert@cs.ucla.edu>
Date: 16 October 2010 06:26:14 BST
Commit Date: 16 October 2010 06:26:43 BST

tar: use more-accurate diagnostic when intermediate mkdir fails

Without this change, if tar tried to extract a file A/B/C, noticed
that A/B didn't exist, attempted to mkdir A/B, and the mkdir
failed, it did not diagnose the mkdir failure, but simply reported
the failure to open A/B/C. This sometimes led to confusion
because it wasn't clear what tar was trying to do, in particular
that tar tried to mkdir A/B. With this patch, tar issues two
diagnostics in this case: one for A/B and the other for A/B/C.
Problem reported by Hauke Laging in
<http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00020.html>.
* gnulib.modules: Remove faccessat.
* src/extract.c (make_directories): New arg INTERDIR_MADE.
Diagnose mkdir failure. Return 0 on success, nonzero on failure,
as opposed to nonzero iff some directory was created. All callers
changed. Simplify the code when mkdir fails, by checking whether
the desired file exists unless errno==EEXIST: this is more robust.