Add a test: demonstrate that chmod ignores a dangling symlink

* tests/chmod/thru-dangling: New test.  Fails.
* tests/chmod/Makefile.am (TESTS): Add thru-dangling.

ChangeLog

@@ -1,3 +1,9 @@
+2007-09-07  Bob Proulx  <bob@proulx.com>
+
+	Add a test: demonstrate that chmod ignores a dangling symlink
+	* tests/chmod/thru-dangling: New test.  Fails.
+	* tests/chmod/Makefile.am (TESTS): Add thru-dangling.
+
 2007-09-05  Jim Meyering  <jim@meyering.net>
 
 	Adapt to new SELinux behavior: "?" vs. new "unlabeled"

tests/chmod/Makefile.am

@@ -1,5 +1,6 @@
 ## Process this file with automake to produce Makefile.in -*-Makefile-*-.
 TESTS = \
+  thru-dangling \
   inaccessible \
   c-option \
   equal-x \

tests/chmod/thru-dangling

@@ -0,0 +1,45 @@
+#!/bin/sh
+# Test for proper error and exit code of chmod on a dangling symlink.
+
+# Copyright (C) 2007 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 <http://www.gnu.org/licenses/>.
+
+if test "$VERBOSE" = yes; then
+  set -x
+  chmod --version
+fi
+
+pwd=`pwd`
+t0=`echo "$0"|sed 's,.*/,,'`.tmp; tmp=$t0/$$
+trap 'status=$?; cd "$pwd" && chmod -R u+rwx $t0 && rm -rf $t0 && exit $status' 0
+trap '(exit $?); exit $?' 1 2 13 15
+
+framework_failure=0
+mkdir -p $tmp || framework_failure=1
+cd $tmp || framework_failure=1
+
+ln -s non-existent dangle || framework_failure=1
+
+if test $framework_failure = 1; then
+  echo "$0: failure in testing framework" 1>&2
+  (exit 1); exit 1
+fi
+
+fail=0
+
+# This operation cannot succeed since the symbolic link dangles.
+chmod 644 dangle && fail=1
+
+(exit $fail); exit $fail