tar: fix bug with -C and extracting directories

Problem reported by Denis Excoffier in

<http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00034.html>.

* src/extract.c (extract_dir): Use mkdirat, not mkdir.

* tests/extrac16.at: New file, to test for this bug.

* tests/Makefile.am (TESTSUITE_AT): Add it.

* tests/testsuite.at: Include it.

---

 src/extract.c      |    2 +-

 tests/Makefile.am  |    1 +

 tests/extrac16.at  |   36 ++++++++++++++++++++++++++++++++++++

 tests/testsuite.at |    1 +

 4 files changed, 39 insertions(+), 1 deletions(-)

 create mode 100644 tests/extrac16.at

diff --git a/src/extract.c b/src/extract.c

index 0d23d4a..98236ac 100644

--- a/src/extract.c

+++ b/src/extract.c

@@ -777,7 +777,7 @@ extract_dir (char *file_name, int typeflag)

   for (;;)

     {

-      status = mkdir (file_name, mode);

+      status = mkdirat (chdir_fd, file_name, mode);

       if (status == 0)

 	{

 	  current_mode = mode & ~ current_umask;

diff --git a/tests/Makefile.am b/tests/Makefile.am

index d29563a..b71e83c 100644

--- a/tests/Makefile.am

+++ b/tests/Makefile.am

@@ -82,6 +82,7 @@ TESTSUITE_AT = \

  extrac13.at\

  extrac14.at\

  extrac15.at\

+ extrac16.at\

  filerem01.at\

  filerem02.at\

  gzip.at\

diff --git a/tests/extrac16.at b/tests/extrac16.at

new file mode 100644

index 0000000..625e579

--- /dev/null

+++ b/tests/extrac16.at

@@ -0,0 +1,36 @@

+# Process this file with autom4te to create testsuite. -*- Autotest -*-

+

+# Test suite for GNU tar.

+# Copyright (C) 2010 Free Software Foundation, Inc.

+

+# This program is free software; you can redistribute it and/or modify

+# it under the terms of the GNU General Public License as published by

+# the Free Software Foundation; either version 3, or (at your option)

+# any later version.

+

+# This program is distributed in the hope that it will be useful,

+# but WITHOUT ANY WARRANTY; without even the implied warranty of

+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+# GNU General Public License for more details.

+

+# You should have received a copy of the GNU General Public License

+# along with this program.  If not, see <http://www.gnu.org/licenses/>.

+

+# written by Paul Eggert from a bug report by Denis Excoffier

+# <http://lists.gnu.org/archive/html/bug-tar/2010-10/msg00034.html>

+

+# Check extraction of empty directory with -C.

+

+AT_SETUP([extract empty directory with -C])

+AT_KEYWORDS([extract extrac16])

+

+AT_TAR_CHECK([

+mkdir src src/a src/a/b dest

+touch src/a/c

+

+tar -cf archive.tar -C src a &&

+tar -xf archive.tar -C dest

+],

+[0],[],[],[],[],[gnu])

+

+AT_CLEANUP

diff --git a/tests/testsuite.at b/tests/testsuite.at

index c386892..40f0e41 100644

--- a/tests/testsuite.at

+++ b/tests/testsuite.at

@@ -154,6 +154,7 @@ m4_include([extrac12.at])

 m4_include([extrac13.at])

 m4_include([extrac14.at])

 m4_include([extrac15.at])

+m4_include([extrac16.at])

 m4_include([label01.at])

 m4_include([label02.at])

-- 

1.7.2