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