#!/bin/sh # ensure that mv doesn't first unlink its destination in one particular case # Copyright (C) 2006-2018 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 . . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src print_ver_ mv require_strace_ unlink # Before the fix, mv would unnecessarily unlink the destination symlink: # $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2 # $ strace -qe unlink /bin/mv -T s1 s2 # unlink("s2") = 0 # # With the fix, it doesn't call unlink: # $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2 # $ strace -qe unlink ./mv -T s1 s2 # $ ln -s t1 s1 || framework_failure_ ln -s t2 s2 || framework_failure_ strace -qe unlink mv -T s1 s2 > out 2>&1 || fail=1 $EGREP 'unlink.*"s1"' out && fail=1 # Ensure that the source, s1, is gone. ls -dl s1 > /dev/null 2>&1 && fail=1 # Ensure that the destination, s2, contains the link from s1. test "$(readlink s2)" = t1 || fail=1 Exit $fail