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#!/bin/sh
# demonstrate that tail -F works for currently missing dirs
# Before coreutils-8.6, tail -F missing/file would not
# notice any subsequent availability of the missing/file.
# Copyright (C) 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/>.
. "${srcdir=.}/init.sh"; path_prepend_ ../src
test "$VERBOSE" = yes && tail --version
debug='---disable-inotify'
debug=
tail $debug -F -s.1 missing/file > out 2>&1 & pid=$!
check_tail_output()
{
local delay="$1"
grep "$tail_re" out > /dev/null ||
{ sleep $delay; return 1; }
}
# Wait up to 6.3s for tail to start with diagnostic:
# tail: cannot open `missing/file' for reading: No such file or directory
tail_re='cannot open' retry_delay_ check_tail_output .1 7 || fail=1
mkdir missing || fail=1
(cd missing && echo x > file)
# Wait up to 6.3s for this to appear in the output:
# "tail: `...' has appeared; following end of new file"
tail_re='has appeared' retry_delay_ check_tail_output .1 7 ||
{ echo "$0: file: unexpected delay?"; cat out; fail=1; }
kill -HUP $pid
Exit $fail
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