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#!/bin/sh
# ensure that tail -F handles rotation
# Copyright (C) 2009-2010 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/test-lib.sh
expensive_
# For details, see
# http://lists.gnu.org/archive/html/bug-coreutils/2009-11/msg00213.html
# 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 $i
rm -rf k x out
:>k && :>x && timeout 10 tail -F k > out 2>&1 &
pid=$!
sleep .1
echo b > k;
# wait for b to appear in out
while :; do grep b out > /dev/null && break; done
mv x k
# wait for tail to detect the rename
while :; do grep tail: out > /dev/null && break; done
echo ok >> k
found=0
# wait up to 10 seconds for "ok" to appear in out
for j in $(seq 100); do
grep ok out > /dev/null && { found=1; break; }
sleep 0.1
done
kill $pid
test $found = 0 && { fail=1; cat out; break; }
done
Exit $fail
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