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#!/bin/sh
# Demonstrate that "truncate -s0 writable-but-owned-by-other" works.
# Copyright (C) 2008-2011 Free Software Foundation, Inc.
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ truncate
require_root_
group_num=$(id -g $NON_ROOT_USERNAME)
# Create a file owned by root, and writable by $NON_ROOT_USERNAME.
echo > root-owned || framework_failure_
chgrp +$group_num . root-owned || framework_failure_
chmod g+w root-owned
# Ensure that the current directory is searchable by $NON_ROOT_USERNAME.
chmod g+x .
setuidgid $NON_ROOT_USERNAME env PATH="$PATH" truncate -s0 root-owned || fail=1
Exit $fail
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