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#!/bin/sh
# Ensure that hard-linked files are counted (and listed) only once.
# Likewise for excluded directories.
# Ensure that hard links _are_ listed twice when using --count-links.
# Copyright (C) 2003-2026 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
mkdir -p dir/sub
( cd dir &&
{ echo non-empty > f1
ln f1 f2
ln -s f1 f3
echo non-empty > sub/F; } )
du -a -L --exclude=sub --count-links dir \
| sed 's/^[0-9][0-9]* //' | sort -r > out || fail=1
# For these tests, transform f1 or f2 or f3 (whichever name is find
# first) to f_. That is necessary because, depending on the type of
# file system, du could encounter any of those linked files first,
# thus listing that one and not the others.
for args in '-L' 'dir' '-L dir'
do
echo === >> out
du -a --exclude=sub $args dir \
| sed 's/^[0-9][0-9]* //' | sed 's/f[123]/f_/' >> out || fail=1
done
cat <<\EOF > exp
dir/f3
dir/f2
dir/f1
dir
===
dir/f_
dir
===
dir/f_
dir/f_
dir
===
dir/f_
dir
EOF
compare exp out || fail=1
# Test du -l (--count-links) without -a flag
# This should count hard-linked files separately
mkdir test-dir &&
echo 'content' > test-dir/file1 &&
ln test-dir/file1 test-dir/file2 || framework_failure_
du_normal=$(du test-dir | cut -f1) || fail=1
du_count_links=$(du -l test-dir | cut -f1) || fail=1
# The count-links version should be larger
if test "$du_normal" -gt 0; then
test "$du_count_links" -gt "$du_normal" || fail=1
fi
Exit $fail
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