1#!/bin/sh 2# readlink from 6.9 would fail with a false-positive symlink loop error 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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 20print_ver_ readlink pwd 21cwd=$(env pwd -P) 22 23# To trigger this bug, we have to construct a name/situation during 24# the resolution of which the code dereferences the same symlink (S) 25# two different times with no actual loop. In addition, arrange 26# so that the second and fourth calls to readlink operate on S. 27 28ln -s s p || framework_failure_ 29ln -s d s || framework_failure_ 30mkdir d || framework_failure_ 31echo 2 > d/2 || framework_failure_ 32ln -s ../s/2 d/1 || framework_failure_ 33 34# With coreutils-6.9, this would fail with ELOOP. 35readlink -v -e p/1 > out || fail=1 36# readlink -e d/2 > exp || fail=1 37echo "$cwd/d/2" > exp || framework_failure_ 38compare exp out || fail=1 39 40# Construct a real loop and make sure readlink still detects it. 41ln -sf ../s/1 d/2 || framework_failure_ 42readlink -v -e p/1 2> out && fail=1 43readlink_msg=$(cat out) 44case $readlink_msg in 45 "readlink: p/1: "*) ;; 46 *) fail=1;; 47esac 48symlink_loop_msg=${readlink_msg#"readlink: p/1: "} 49 50# Exercise the hash table code. 51ln -nsf ../s/3 d/2 || framework_failure_ 52ln -nsf ../p/4 d/3 || framework_failure_ 53ln -nsf ../p/5 d/4 || framework_failure_ 54ln -nsf ../p/6 d/5 || framework_failure_ 55ln -nsf ../p/7 d/6 || framework_failure_ 56ln -nsf ../p/8 d/7 || framework_failure_ 57echo x > d/8 || framework_failure_ 58readlink -v -e p/1 > out || fail=1 59echo "$cwd/d/8" > exp || framework_failure_ 60compare exp out || fail=1 61 62# A trivial loop 63ln -s loop loop 64readlink -v -e loop 2> out && fail=1 65echo "readlink: loop: $symlink_loop_msg" > exp || framework_failure_ 66compare exp out || fail=1 67 68Exit $fail 69