1#!/bin/sh 2# Demonstrate that when moving a symlink onto a hardlink-to-that-symlink, 3# an error is presented. Depending on your kernel (e.g., Linux, Solaris, 4# but not NetBSD), prior to coreutils-8.16, the mv would successfully perform 5# a no-op. I.e., surprisingly, mv s1 s2 would succeed, yet fail to remove s1. 6 7# Copyright (C) 2012-2023 Free Software Foundation, Inc. 8 9# This program is free software: you can redistribute it and/or modify 10# it under the terms of the GNU General Public License as published by 11# the Free Software Foundation, either version 3 of the License, or 12# (at your option) any later version. 13 14# This program is distributed in the hope that it will be useful, 15# but WITHOUT ANY WARRANTY; without even the implied warranty of 16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17# GNU General Public License for more details. 18 19# You should have received a copy of the GNU General Public License 20# along with this program. If not, see <https://www.gnu.org/licenses/>. 21 22. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 23print_ver_ mv 24 25# Create a file f, and a symlink s1 to that file. 26touch f || framework_failure_ 27ln -s f s2 || framework_failure_ 28 29# Attempt to create a hard link to that symlink. 30# On some systems, it's not possible: they create a hard link to the referent. 31ln s2 s1 || framework_failure_ 32 33# If s1 is not a symlink, skip this test. 34test -h s1 \ 35 || skip_ your kernel or file system cannot create a hard link to a symlink 36 37for opt in '' --backup; do 38 39 if test "$opt" = --backup; then 40 mv $opt s1 s2 > out 2>&1 || fail=1 41 compare /dev/null out || fail=1 42 43 # Ensure that s1 is gone. 44 test -e s1 && fail=1 45 46 # With --backup, ensure that the backup file was created. 47 ref=$(readlink s2~) || fail=1 48 test "$ref" = f || fail=1 49 else 50 echo "mv: 's1' and 's2' are the same file" > exp 51 mv $opt s1 s2 2>err && fail=1 52 compare exp err || fail=1 53 54 # Ensure that s1 is still present. 55 test -e s1 || fail=1 56 57 # Without --backup, ensure there is no backup file. 58 test -e s2~ && fail=1 59 fi 60 61done 62 63Exit $fail 64