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#!/bin/sh
# ensure that tail -F handles rotation
# Copyright (C) 2009-2015 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 <http://www.gnu.org/licenses/>.
if test "$VERBOSE" = yes; then
set -x
tail --version
fi
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
grep '^#define HAVE_INOTIFY 1' "$CONFIG_HEADER" >/dev/null \
|| expensive_
check_tail_output()
{
local delay="$1"
grep "$tail_re" out > /dev/null ||
{ sleep $delay; return 1; }
}
# Wait up to 25.5 seconds for grep REGEXP 'out' to succeed.
grep_timeout() { tail_re="$1" retry_delay_ check_tail_output .1 8; }
# For details, see
# http://lists.gnu.org/archive/html/bug-coreutils/2009-11/msg00213.html
cleanup_fail()
{
cat out
warn_ $1
kill $pid
}
# Perform at least this many iterations, because on multi-core systems
# the offending sequence of events can be surprisingly uncommon.
for i in $(seq 50); do
echo $i
rm -f k x out
# Normally less than a second is required here, but with heavy load
# and a lot of disk activity, even 20 seconds is insufficient, which
# leads to this timeout killing tail before the "ok" is written below.
>k && >x || framework_failure_ failed to initialize files
timeout 60 tail -s.1 --max-unchanged-stats=1 -F k > out 2>&1 &
pid=$!
echo b > k;
# wait for b to appear in out
grep_timeout 'b' || { cleanup_fail 'failed to find b in out'; break; }
mv x k
# wait for tail to detect the rename
grep_timeout 'tail:' || { cleanup_fail 'failed to detect rename'; break; }
echo ok >> k
# wait for "ok" to appear in 'out'
grep_timeout 'ok' || { cleanup_fail 'failed to detect echoed ok'; break; }
kill $pid
done
wait
Exit $fail
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