1 files changed, 64 insertions, 0 deletions
diff --git a/tests/du/hard-link.sh b/tests/du/hard-link.sh
new file mode 100755
index 0000000..7cd03d3
--- /dev/null
+++ b/tests/du/hard-link.sh
@@ -0,0 +1,64 @@
+#!/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) 2003-2022 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
+
+Exit $fail