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#!/bin/sh
# Ensure that tail -f works on an append-only file
# Requires root access to do chattr +a, as well as an ext[23] or xfs file system
# Copyright (C) 2006-2020 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 <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
require_root_
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
chattr_a_works=1
touch f
chattr +a f 2>/dev/null || chattr_a_works=0
( echo x > f ) 2>/dev/null && chattr_a_works=0
echo x >> f || chattr_a_works=0
if test $chattr_a_works = 0; then
skip_ "chattr +a doesn't work on this file system"
fi
for mode in '' '---disable-inotify'; do
sleep 1 & pid=$!
tail --pid=$pid -f $mode f || fail=1
cleanup_
done
chattr -a f 2>/dev/null
Exit $fail
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