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#!/bin/sh
# Demonstrate that tail -f works when renaming the tailed files.
# Between coreutils 7.5 and 8.23 inclusive, 'tail -f a' would
# stop tracking additions to b after 'mv a b'.
# Copyright (C) 2015-2022 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
check_tail_output()
{
local delay="$1"
grep "$tail_re" out ||
{ 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 a out
touch a || framework_failure_
tail $mode $fastpoll -f a > out 2>&1 & pid=$!
# Wait up to 12.7s for tail to start.
echo x > a
tail_re='^x$' retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
mv a b || framework_failure_
echo y >> b
# Wait up to 12.7s for "y" to appear in the output:
tail_re='^y$' retry_delay_ check_tail_output .1 7 || { cat out; fail=1; }
cleanup_
done
Exit $fail
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