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81 lines
2.1 KiB
Bash
Executable File
81 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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# Make sure that `tail -f' returns immediately if a file doesn't exist
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# while `tail -F' waits for it to appear.
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# Copyright (C) 2003, 2006-2011 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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touch here || framework_failure
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{ touch unreadable && chmod a-r unreadable; } || framework_failure
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for inotify in ---disable-inotify ''; do
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timeout 10 tail -s0.1 -f $inotify not_here
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test $? = 124 && fail=1
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if test ! -r unreadable; then # can't test this when root
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timeout 10 tail -s0.1 -f $inotify unreadable
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test $? = 124 && fail=1
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fi
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timeout 1 tail -s0.1 -f $inotify here 2>tail.err
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test $? = 124 || fail=1
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# `tail -F' must wait in any case.
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timeout 1 tail -s0.1 -F $inotify here 2>>tail.err
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test $? = 124 || fail=1
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if test ! -r unreadable; then # can't test this when root
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timeout 1 tail -s0.1 -F $inotify unreadable
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test $? = 124 || fail=1
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fi
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timeout 1 tail -s0.1 -F $inotify not_here
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test $? = 124 || fail=1
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grep -Ev 'inotify (resources exhausted|cannot be used)' tail.err > x
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mv x tail.err
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test -s tail.err && fail=1
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:>tail.err
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tail_F()
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{
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local delay="$1"
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touch k || framework_failure
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tail -s.1 --max-unchanged-stats=2 -F $inotify k > tail.out &
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pid=$!
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sleep $delay
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mv k l
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sleep $delay
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touch k
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mv k l
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sleep $delay
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echo NO >> l
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sleep $delay
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kill $pid
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rm -f k l
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test ! -s tail.out
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}
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retry_delay_ tail_F .1 4 || fail=1
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done
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Exit $fail
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