1#!/bin/sh
2# Ensure all logs are output upon file truncation
3
4# Copyright (C) 2015-2023 Free Software Foundation, Inc.
5
6# This program is free software: you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation, either version 3 of the License, or
9# (at your option) any later version.
10
11# This program is distributed in the hope that it will be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15
16# You should have received a copy of the GNU General Public License
17# along with this program.  If not, see <https://www.gnu.org/licenses/>.
18
19. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
20print_ver_ tail
21
22check_tail_output()
23{
24  local delay="$1"
25  grep "$tail_re" out > /dev/null ||
26    { sleep $delay; return 1; }
27}
28
29# Terminate any background tail process
30cleanup_() { kill $pid 2>/dev/null && wait $pid; }
31
32# Speedup the non inotify case
33fastpoll='-s.1 --max-unchanged-stats=1'
34
35for follow in '-f' '-F'; do
36  for mode in '' '---disable-inotify'; do
37    rm -f out
38    seq 10 > f || framework_failure_
39
40    tail $follow $mode $fastpoll f > out 2>&1 & pid=$!
41
42    # Wait up to 12.7s for tail to start
43    tail_re='^10$' retry_delay_ check_tail_output .1 7 ||
44      { cat out; fail=1; }
45
46    seq 11 15 > f || framework_failure_
47
48    # Wait up to 12.7s for new data
49    tail_re='^15$' retry_delay_ check_tail_output .1 7 ||
50      { cat out; fail=1; }
51
52    cleanup_
53  done
54done
55
56Exit $fail
57