1#!/bin/sh
2# ensure that mv doesn't first unlink its destination in one particular case
3
4# Copyright (C) 2006-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ mv
21require_strace_ unlink
22
23# Before the fix, mv would unnecessarily unlink the destination symlink:
24#   $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2
25#   $ strace -qe unlink /bin/mv -T s1 s2
26#   unlink("s2") = 0
27#
28# With the fix, it doesn't call unlink:
29#   $ rm -rf s[12]; ln -s / s1; ln -s /tmp s2
30#   $ strace -qe unlink ./mv -T s1 s2
31#   $
32
33ln -s t1 s1 || framework_failure_
34ln -s t2 s2 || framework_failure_
35
36
37strace -qe unlink mv -T s1 s2 > out 2>&1 || fail=1
38$EGREP 'unlink.*"s1"' out && fail=1
39
40# Ensure that the source, s1, is gone.
41ls -dl s1 > /dev/null 2>&1 && fail=1
42
43# Ensure that the destination, s2, contains the link from s1.
44test "$(readlink s2)" = t1 || fail=1
45
46Exit $fail
47