#!/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) 2006-2018 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 . . "${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