1#!/bin/sh 2# Ensure that tail -f works on an append-only file 3# Requires root access to do chattr +a, as well as an ext[23] or xfs file system 4 5# Copyright (C) 2006-2023 Free Software Foundation, Inc. 6 7# This program is free software: you can redistribute it and/or modify 8# it under the terms of the GNU General Public License as published by 9# the Free Software Foundation, either version 3 of the License, or 10# (at your option) any later version. 11 12# This program is distributed in the hope that it will be useful, 13# but WITHOUT ANY WARRANTY; without even the implied warranty of 14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15# GNU General Public License for more details. 16 17# You should have received a copy of the GNU General Public License 18# along with this program. If not, see <https://www.gnu.org/licenses/>. 19 20. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src 21print_ver_ tail 22require_root_ 23 24# Terminate any background tail process 25cleanup_() { kill $pid 2>/dev/null && wait $pid; } 26 27chattr_a_works=1 28touch f 29chattr +a f 2>/dev/null || chattr_a_works=0 30( echo x > f ) 2>/dev/null && chattr_a_works=0 31echo x >> f || chattr_a_works=0 32 33if test $chattr_a_works = 0; then 34 skip_ "chattr +a doesn't work on this file system" 35fi 36 37 38for mode in '' '---disable-inotify'; do 39 sleep 1 & pid=$! 40 tail --pid=$pid -f $mode f || fail=1 41 cleanup_ 42done 43 44chattr -a f 2>/dev/null 45 46Exit $fail 47