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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) 2003-2023 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/>.
. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
print_ver_ tail
grep '^#define HAVE_INOTIFY 1' "$CONFIG_HEADER" >/dev/null \
&& HAVE_INOTIFY=1
inotify_failed_re='inotify (resources exhausted|cannot be used)'
touch here || framework_failure_
{ touch unreadable && chmod a-r unreadable; } || framework_failure_
# Terminate any background tail process
cleanup_() { kill $pid 2>/dev/null && wait $pid; }
# speedup non inotify case
fastpoll='-s.1 --max-unchanged-stats=1'
for mode in '' '---disable-inotify'; do
returns_ 124 timeout 10 tail $fastpoll -f $mode not_here && fail=1
if test ! -r unreadable; then # can't test this when root
returns_ 124 timeout 10 tail $fastpoll -f $mode unreadable && fail=1
fi
returns_ 124 timeout .1 tail $fastpoll -f $mode here 2>tail.err || fail=1
# 'tail -F' must wait in any case.
returns_ 124 timeout .1 tail $fastpoll -F $mode here 2>>tail.err || fail=1
if test ! -r unreadable; then # can't test this when root
returns_ 124 timeout .1 tail $fastpoll -F $mode unreadable || fail=1
fi
returns_ 124 timeout .1 tail $fastpoll -F $mode not_here || fail=1
grep -Ev "$inotify_failed_re" tail.err > x
mv x tail.err
compare /dev/null tail.err || fail=1
>tail.err
done
if test "$HAVE_INOTIFY" && test -z "$mode" && is_local_dir_ .; then
# Ensure -F never follows a descriptor after rename
# either with tiny or significant delays between operations
tail_F()
{
local delay="$1"
> k && > tail.out && > tail.err || framework_failure_
tail $fastpoll -F $mode k >tail.out 2>tail.err & pid=$!
sleep $delay
mv k l
sleep $delay
touch k
mv k l
sleep $delay
echo NO >> l
sleep $delay
cleanup_
rm -f k l
test -s tail.out \
&& ! grep -E "$inotify_failed_re" tail.err >/dev/null
}
retry_delay_ tail_F 0 1 && { cat tail.out; fail=1; }
retry_delay_ tail_F .2 1 && { cat tail.out; fail=1; }
fi
Exit $fail
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