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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) 2006-2007 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/>.
if test "$VERBOSE" = yes; then
set -x
tail --version
fi
PRIV_CHECK_ARG=require-root . $srcdir/../priv-check
. $srcdir/../test-lib.sh
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
echo "$0: chattr +a doesn't work on this file system; skipping this test " 1>&2
(exit 77); exit 77
fi
fail=0
sleep 1 &
pid=$!
tail --pid=$pid -f f > /dev/null 2>&1 || fail=1
chattr -a f 2>/dev/null
(exit $fail); exit $fail
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