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50 lines
1.6 KiB
Bash
Executable File
50 lines
1.6 KiB
Bash
Executable File
#!/bin/sh
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# demonstrate that tail -F works for currently missing dirs
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# Before coreutils-8.6, tail -F missing/file would not
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# notice any subsequent availability of the missing/file.
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# Copyright (C) 2010-2011 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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debug='---disable-inotify'
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debug=
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tail $debug -F -s.1 missing/file > out 2>&1 & pid=$!
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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 with diagnostic:
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# tail: cannot open `missing/file' for reading: No such file or directory
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tail_re='cannot open' retry_delay_ check_tail_output .1 7 || fail=1
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mkdir missing || fail=1
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(cd missing && echo x > file)
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# Wait up to 6.3s for this to appear in the output:
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# "tail: `...' has appeared; following end of new file"
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tail_re='has appeared' retry_delay_ check_tail_output .1 7 ||
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{ echo "$0: file: unexpected delay?"; cat out; fail=1; }
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kill -HUP $pid
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Exit $fail
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