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# ensure that tail -F handles rotation
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# Copyright (C) 2009-2011 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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if test "$VERBOSE" = yes; then
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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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# Wait several seconds for grep REGEXP FILE to succeed.
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# Usage: grep_timeout REGEXP FILE
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for j in $(seq 150); do
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grep $1 $2 > /dev/null && return 0
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# http://lists.gnu.org/archive/html/bug-coreutils/2009-11/msg00213.html
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# Perform at least this many iterations, because on multi-core systems
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# the offending sequence of events can be surprisingly uncommon.
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for i in $(seq 50); do
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# Normally less than a second is required here, but with heavy load
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# and a lot of disk activity, even 20 seconds is insufficient, which
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# leads to this timeout killing tail before the "ok" is written below.
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:>k && :>x && timeout 40 tail -F k > out 2>&1 &
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# wait for b to appear in out
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grep_timeout b out || fail_ failed to find b in out
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while :; do grep b out > /dev/null && break; done
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# wait for tail to detect the rename
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grep_timeout tail: out || { cat out; fail_ failed to detect rename; }
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# wait up to 10 seconds for "ok" to appear in out
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grep_timeout ok out && found=1
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test $found = 0 && { cat out; fail_ failed to detect echoed '"ok"'; }
added
removed
tests/tail-2/inotify-rotate
