tests/du/bind-mount-dir-cycle.sh
#!/bin/sh
# Exercise du's new ability to handle bind-mount-induced dir cycles.

# Copyright (C) 2012-2025 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 <https://www.gnu.org/licenses/>.

. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ du
require_root_

cleanup_() { umount a/b; }

mkdir -p a/b || framework_failure_
mount --bind a a/b \
  || skip_ "This test requires mount with a working --bind option."

echo a > exp || framework_failure_

du a > out 2> err || fail=1
sed 's/^[0-9][0-9]*	//' out > k && mv k out

compare /dev/null err || fail=1
compare exp out || fail=1

Exit $fail
