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#!/bin/sh
# demonstrate that tail -F works when renaming the tailed files
# Before coreutils-8.3, tail -F a b would stop tracking additions to b
# after "mv a b".
# 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
touch a b || framework_failure
debug='---disable-inotify -s .01'
debug=
tail $debug -F a b > out 2>&1 & pid=$!
# Wait until tail has started...
echo x > a
until grep '^x$' out >/dev/null 2>&1; do :; done
mv a b || fail=1
# Wait for the diagnostic:
# tail: `a' has become inaccessible: No such file or directory
until grep inaccessible out >/dev/null 2>&1; do :; done
echo x > a
# Wait up to 4s for this to appear in the output:
# "tail: `...' has appeared; following end of new file"
found=false
for i in $(seq 20); do
grep 'has appeared;' out > /dev/null && { found=true; break; }
sleep .2
done
$found || { echo "$0: a: unexpected delay?"; cat out; fail=1; }
echo y >> b
# Wait up to 4s for "y" to appear in the output:
found=false
for i in $(seq 20); do
case $(tr '\n' @ < out) in
*'@@==> b <==@y@') found=true; break 2;;
esac
sleep .2
done
$found || { echo "$0: b: unexpected delay?"; cat out; fail=1; }
echo z >> a
# Wait up to 4s for "z" to appear in the output:
found=false
for i in $(seq 20); do
case $(tr '\n' @ < out) in
*'@@==> a <==@z@') found=true; break 2;;
esac
sleep .2
done
$found || { echo "$0: b: unexpected delay?"; cat out; fail=1; }
kill -HUP $pid
Exit $fail
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