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64 lines
1.8 KiB
Bash
Executable File
64 lines
1.8 KiB
Bash
Executable File
#!/bin/sh
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# Exercise an abort-inducing flaw in inotify-enabled tail -F.
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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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. "${srcdir=.}/init.sh"; path_prepend_ ../src
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print_ver_ tail
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# 9 is a magic number, related to internal details of tail.c and hash.c
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n=9
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seq $n | xargs touch || framework_failure
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debug='---disable-inotify'
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debug=
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tail $debug -s.1 -qF $(seq $n) > out 2>&1 & pid=$!
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check_tail_output()
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{
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local delay="$1"
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grep "$tail_re" out > /dev/null ||
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{ sleep $delay; return 1; }
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}
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# Wait up to 6.3s for tail to start
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echo x > $n
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tail_re='^x$' retry_delay_ check_tail_output .1 7 || fail=1
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mv 1 f || fail=1
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# Wait 6.3s for this diagnostic:
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# tail: `1' has become inaccessible: No such file or directory
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tail_re='inaccessible' retry_delay_ check_tail_output .1 7 || fail=1
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# Trigger the bug. Before the fix, this would provoke the abort.
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echo a > 1 || fail=1
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# Wait up to 2s for the buggy tail to die,
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# or for the "tail: `1' has appeared; following end of new file" output
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for i in $(seq 10); do
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kill -0 $pid || break
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grep 'has appeared;' out > /dev/null && break
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sleep .2
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done
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# Kill the working tail, or fail if it has already aborted
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kill $pid || fail=1
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cat out
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Exit $fail
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