1#!/bin/sh
2# ensure that cp does not write through a just-copied 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
22mkdir a b c || framework_failure_
23ln -s ../t a/1 || framework_failure_
24echo payload > b/1 || framework_failure_
25
26echo "cp: will not copy 'b/1' through just-created symlink 'c/1'" \
27  > exp || framework_failure_
28
29# Check both cases: a dangling symlink, and one pointing to a writable file.
30
31for i in dangling-dest existing-dest; do
32  test $i = existing-dest && echo i > t
33  test $i = dangling-dest && rm -f t
34
35  cp -dR a/1 b/1 c 2> out && fail=1
36
37  compare exp out || fail=1
38
39  # When the destination is a dangling symlink,
40  # ensure that cp does not create it.
41  test $i = dangling-dest \
42    && test -f t && fail=1
43
44  # When the destination symlink points to a writable file,
45  # ensure that cp does not change it.
46  test $i = existing-dest \
47    && case $(cat t) in i);; *) fail=1;; esac
48done
49
50Exit $fail
51