1#!/bin/sh
2# Demonstrate that "truncate -s0 writable-but-owned-by-other" works.
3
4# Copyright (C) 2008-2023 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_ truncate
21
22require_root_
23
24# Create a file owned by root, and writable by $NON_ROOT_USERNAME.
25echo > root-owned || framework_failure_
26chgrp +$NON_ROOT_GID . root-owned || framework_failure_
27chmod g+w root-owned
28
29# Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
30chmod g+x .
31
32chroot --skip-chdir --user=$NON_ROOT_USERNAME / env PATH="$PATH" \
33  truncate -s0 root-owned || fail=1
34
35Exit $fail
36