#!/bin/sh
# Show fts fails on old-fashioned systems.

# Copyright (C) 2006-2009 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 of the License, 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/>.

# Show that fts (hence du, chmod, chgrp, chown) fails when all of the
# following are true:
#   - `.' is not readable
#   - operating on a hierarchy containing a relative name longer than PATH_MAX
#   - run on a system where gnulib's openat emulation must resort to using
#       save_cwd and restore_cwd (which fail if `.' is not readable).
# Thus, the following du invocation should succeed on newer Linux and
# Solaris systems, yet it must fail on systems lacking both openat and
# /proc support.  However, before coreutils-6.0 this test would fail even
# on Linux+PROC_FS systems because its fts implementation would revert
# unnecessarily to using FTS_NOCHDIR mode in this corner case.

if test "$VERBOSE" = yes; then
  set -x
  du --version
fi

. $srcdir/test-lib.sh

proc_file=/proc/self/fd
if test ! -d $proc_file; then
  skip_test_ 'This test would fail, since your system lacks /proc support.'
fi

dir=`printf '%200s\n' ' '|tr ' ' x`

# Construct a hierarchy containing a relative file with a name
# longer than PATH_MAX.
# for i in `seq 52`; do
#   mkdir $dir || framework_failure
#   cd $dir || framework_failure
# done
# cd $tmp || framework_failure

# Sheesh.  Bash 3.1.5 can't create this hierarchy.  I get
# cd: error retrieving current directory: getcwd: cannot access parent directories:

cwd=`pwd`
# Use perl instead:
: ${PERL=perl}
$PERL \
    -e 'my $d = '$dir'; foreach my $i (1..52)' \
    -e '  { mkdir ($d, 0700) && chdir $d or die "$!" }' \
  || framework_failure

mkdir inaccessible || framework_failure
cd inaccessible || framework_failure
chmod 0 . || framework_failure

fail=0
du -s "$cwd/$dir" > /dev/null || fail=1

Exit $fail
