56 lines
1.6 KiB
Bash
Executable file
56 lines
1.6 KiB
Bash
Executable file
#!/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) 2015-2025 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
|