1#!/bin/sh
2# Ensure that cp works as documented, when the destination is a dangling symlink
3
4# Copyright (C) 2007-2023 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_ cp
21
22ln -s no-such dangle || framework_failure_
23echo hi > f || framework_failure_
24echo hi > exp || framework_failure_
25echo "cp: not writing through dangling symlink 'dangle'" \
26    > exp-err || framework_failure_
27
28
29# Starting with 6.9.90, this usage fails, by default:
30for opt in '' '-f'; do
31  returns_ 1 cp $opt f dangle > err 2>&1 || fail=1
32  compare exp-err err || fail=1
33  test -f no-such && fail=1
34done
35
36
37# But you can set POSIXLY_CORRECT to get the historical behavior.
38env POSIXLY_CORRECT=1 cp f dangle > out 2>&1 || fail=1
39cat no-such >> out || fail=1
40compare exp out || fail=1
41
42
43# Starting with 8.30 we treat ELOOP as existing and so
44# remove the symlink
45ln -s loop loop || framework_failure_
46cp -f f loop > err 2>&1 || fail=1
47compare /dev/null err || fail=1
48compare exp loop || fail=1
49test -f loop || fail=1
50
51Exit $fail
52