1 files changed, 82 insertions, 0 deletions
diff --git a/tests/touch/no-dereference.sh b/tests/touch/no-dereference.sh
new file mode 100755
index 0000000..5249d62
--- /dev/null
+++ b/tests/touch/no-dereference.sh
@@ -0,0 +1,82 @@
+#!/bin/sh
+# Ensure that touch -h works.
+
+# Copyright (C) 2009-2022 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/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ touch test
+
+ln -s nowhere dangling || framework_failure_
+touch file || framework_failure_
+ln -s file link || framework_failure_
+
+
+# These first tests should work on every platform.
+# -h does not create files, but it warns.  Use -c to silence warning.
+returns_ 1 touch -h no-file 2> err || fail=1
+compare /dev/null err && fail=1
+touch -h -c no-file 2> err || fail=1
+compare /dev/null err || fail=1
+
+# -h works on regular files
+touch -h file || fail=1
+
+# -h coupled with -r uses timestamp of the symlink, not the referent.
+touch -h -r dangling file || fail=1
+test -f nowhere && fail=1
+
+# The remaining tests of -h require kernel support for changing symlink times.
+grep '^#define HAVE_UTIMENSAT 1' "$CONFIG_HEADER" > /dev/null ||
+grep '^#define HAVE_LUTIMES 1' "$CONFIG_HEADER" > /dev/null ||
+  skip_ 'this system lacks the utimensat function'
+
+# Changing time of dangling symlink is okay.
+# Skip the test if this fails, but the error text corresponds to
+# ENOSYS (possible with old kernel but new glibc).
+touch -h dangling 2> err
+case $? in
+  0) test -f nowhere && fail=1
+     compare /dev/null err || fail=1;;
+  1) grep 'Function not implemented' err \
+       && skip_ 'this system lacks the utimensat function'
+     fail=1;;
+  *) fail=1;;
+esac
+
+# Change the mtime of a symlink.
+touch -m -h -d 2009-10-10 link || fail=1
+case $(stat --format=%y link) in
+  2009-10-10*) ;;
+  *) fail=1 ;;
+esac
+case $(stat --format=%y file) in
+  2009-10-10*) fail=1;;
+esac
+
+# Test interactions with -.
+touch -h - > file || fail=1
+
+# If >&- works, test "touch -ch -" etc.
+# >&- apparently does not work in HP-UX 11.23.
+# This test is ineffective unless /dev/stdout also works.
+# If stdout is open, it is not a symlink.
+if env test -w /dev/stdout >/dev/null &&
+   env test ! -w /dev/stdout >&-; then
+  returns_ 1 touch -h - >&- || fail=1
+  touch -h -c - >&- || fail=1
+fi
+
+Exit $fail