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#!/bin/sh
# Exercise an abort-inducing flaw in inotify-enabled tail -F.
# Copyright (C) 2009-2022 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 <https://www.gnu.org/licenses/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
# 9 is a magic number, related to internal details of tail.c and hash.c
n=9
seq $n | xargs touch || framework_failure_
check_tail_output()
{
local delay="$1"
grep "$tail_re" out > /dev/null ||
{ sleep $delay; return 1; }
}
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
# Speedup the non inotify case
fastpoll='-s.1 --max-unchanged-stats=1'
for mode in '' '---disable-inotify'; do
rm -f out
tail $mode $fastpoll -qF $(seq $n) > out 2>&1 & pid=$!
# Wait up to 12.7s for tail to start
echo x > $n
tail_re='^x$' retry_delay_ check_tail_output .1 7 ||
{ cat out; fail=1; }
mv 1 f || framework_failure_
# Wait 12.7s for this diagnostic:
# tail: '1' has become inaccessible: No such file or directory
tail_re='inaccessible' retry_delay_ check_tail_output .1 7 ||
{ cat out; fail=1; }
# Trigger the bug. Before the fix, this would provoke the abort.
echo a > 1 || framework_failure_
# Wait up to 6.3s for the "tail: '1' has appeared; ..." message
# (or for the buggy tail to die)
tail_re='has appeared' retry_delay_ check_tail_output .1 6 ||
{ cat out; fail=1; }
# Double check that tail hasn't aborted
kill -0 $pid || fail=1
cleanup_
done
Exit $fail
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