From: Collin Funk <collin.funk1@gmail.com>
Date: Fri, 20 Feb 2026 03:13:34 +0000 (-0800)
Subject: tests: chmod: test that chmod(2) is always called
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d233ebd7d9e36208f5bc03935f910de4c3283dd1;p=thirdparty%2Fcoreutils.git

tests: chmod: test that chmod(2) is always called

* tests/chmod/only-op.sh: New file.
* tests/local.mk (all_test): Add the new test.
---

diff --git a/tests/chmod/only-op.sh b/tests/chmod/only-op.sh
new file mode 100755
index 0000000000..a2fd2546a7
--- /dev/null
+++ b/tests/chmod/only-op.sh
@@ -0,0 +1,31 @@
+#!/bin/sh
+# Test that 'chmod' does not skip calling chmod(2) even when the file mode bits
+# are unchanged.
+
+# Copyright (C) 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ chmod stat
+skip_if_root_
+
+test "$(stat --format=%U /)" = 'root' || skip_ 'root does not own /'
+
+for op in '+' '-' '='; do
+  returns_ 1 chmod "$op" / 2>err || fail=1
+  grep -F "chmod: changing permissions of '/'" err || { fail=1; cat err; }
+done
+
+Exit $fail
diff --git a/tests/local.mk b/tests/local.mk
index 5f9f3d19b6..aa71951f86 100644
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -517,6 +517,7 @@ all_tests =					\
   tests/chmod/ignore-symlink.sh			\
   tests/chmod/inaccessible.sh			\
   tests/chmod/octal.sh				\
+  tests/chmod/only-op.sh			\
   tests/chmod/partial-fail.sh			\
   tests/chmod/setgid.sh				\
   tests/chmod/silent.sh				\