1#!/bin/sh
2# Test "ln -sf".
3
4# Copyright (C) 1997-2023 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_ ln
21
22echo foo > a || framework_failure_
23
24# Check that a target directory of '.' is supported
25# and that indirectly specifying the same target and link name
26# through that is detected.
27ln -s . b || framework_failure_
28ln -sf a b > err 2>&1 && fail=1
29case $(cat err) in
30  *'are the same file') ;;
31  *) fail=1 ;;
32esac
33
34# Ensure we replace symlinks that don't or can't link to an existing target.
35# coreutils-8.22 would fail to replace {ENOTDIR,ELOOP,ENAMETOOLONG}_link below.
36# We apply a limit since AIX returns 2^32-1 which would trigger resource issues.
37name_max=$(stat -f -c %l .) && test "$name_max" -lt $((1024*1024)) ||
38  name_max=1 # skip this portion of the test
39name_max_plus1=$(expr $name_max + 1)
40long_name=$(printf '%*s' $name_max_plus1 | tr ' ' '0')
41
42for f in '' f; do
43  ln -s$f missing ENOENT_link || fail=1
44  ln -s$f a/b ENOTDIR_link || fail=1
45  ln -s$f ELOOP_link ELOOP_link || fail=1
46  ln -s$f "$long_name" ENAMETOOLONG_link || fail=1
47done
48
49Exit $fail
50