tar: -x -C symlink fix

* src/misc.c (chdir_do): Don't use O_NOFOLLOW when opening the
argument to -C.  This is for consistency with "tar -c -C FOO", and
matches the new documentation.
* tests/extrac14.at: New file.
* tests/Makefile.am (TESTSUITE_AT): Add it.
* tests/testsuite.at: Include it.

src/misc.c

@@ -736,7 +736,8 @@ chdir_do (int i)
 	{
 	  if (! IS_ABSOLUTE_FILE_NAME (curr->name))
 	    chdir_do (i - 1);
-	  fd = openat (chdir_fd, curr->name, open_searchdir_flags);
+	  fd = openat (chdir_fd, curr->name,
+		       open_searchdir_flags & ~ O_NOFOLLOW);
 	  if (fd < 0)
 	    open_fatal (curr->name);
 

tests/Makefile.am

@@ -80,6 +80,7 @@ TESTSUITE_AT = \
  extrac11.at\
  extrac12.at\
  extrac13.at\
+ extrac14.at\
  filerem01.at\
  filerem02.at\
  gzip.at\

tests/extrac14.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
+
+# Check that 'tar -x -C FOO' follows FOO if FOO is a symbolic link.
+
+AT_SETUP([extract -C symlink])
+AT_KEYWORDS([extract extrac14])
+
+AT_TAR_CHECK([
+mkdir dest
+ln -s dest symlink
+echo foo >foo
+tar -cf archive.tar foo &&
+tar -xf archive.tar -C symlink &&
+cmp foo dest/foo
+],
+[0],[],[],[],[],[gnu])
+
+AT_CLEANUP

tests/testsuite.at

@@ -152,6 +152,7 @@ m4_include([extrac10.at])
 m4_include([extrac11.at])
 m4_include([extrac12.at])
 m4_include([extrac13.at])
+m4_include([extrac14.at])
 
 m4_include([label01.at])
 m4_include([label02.at])