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#!/bin/sh
# Make sure that 'tail -f' returns immediately if a file doesn't exist
# while 'tail -F' waits for it to appear.
# Copyright (C) 2003-2012 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/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
print_ver_ tail
touch here || framework_failure_
{ touch unreadable && chmod a-r unreadable; } || framework_failure_
for inotify in ---disable-inotify ''; do
timeout 10 tail -s0.1 -f $inotify not_here
test $? = 124 && fail=1
if test ! -r unreadable; then # can't test this when root
timeout 10 tail -s0.1 -f $inotify unreadable
test $? = 124 && fail=1
fi
timeout 1 tail -s0.1 -f $inotify here 2>tail.err
test $? = 124 || fail=1
# 'tail -F' must wait in any case.
timeout 1 tail -s0.1 -F $inotify here 2>>tail.err
test $? = 124 || fail=1
if test ! -r unreadable; then # can't test this when root
timeout 1 tail -s0.1 -F $inotify unreadable
test $? = 124 || fail=1
fi
timeout 1 tail -s0.1 -F $inotify not_here
test $? = 124 || fail=1
grep -Ev 'inotify (resources exhausted|cannot be used)' tail.err > x
mv x tail.err
test -s tail.err && fail=1
:>tail.err
tail_F()
{
local delay="$1"
touch k || framework_failure_
tail -s.1 --max-unchanged-stats=2 -F $inotify k > tail.out &
pid=$!
sleep $delay
mv k l
sleep $delay
touch k
mv k l
sleep $delay
echo NO >> l
sleep $delay
kill $pid
rm -f k l
test ! -s tail.out
}
retry_delay_ tail_F .1 4 || fail=1
done
Exit $fail
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