88 lines
2.6 KiB
Bash
Executable file
88 lines
2.6 KiB
Bash
Executable file
#!/bin/sh
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# Makes sure, inotify will switch to polling mode if directory
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# of the watched file was removed and recreated.
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# (...instead of getting stuck forever)
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# Copyright (C) 2017-2025 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 <https://www.gnu.org/licenses/>.
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. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
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print_ver_ tail
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grep '^#define HAVE_INOTIFY 1' "$CONFIG_HEADER" >/dev/null && is_local_dir_ . \
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|| skip_ 'inotify is not supported'
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# Terminate any background tail process
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cleanup_() { kill $pid 2>/dev/null && wait $pid; }
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cleanup_fail_ ()
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{
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warn_ $1
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cleanup_
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fail=1
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}
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# $check_re - string to be found
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# $check_f - file to be searched
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check_tail_output_ ()
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{
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local delay="$1"
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grep $check_re $check_f > /dev/null ||
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{ sleep $delay ; return 1; }
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}
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grep_timeout_ ()
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{
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check_re="$1"
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check_f="$2"
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retry_delay_ check_tail_output_ .1 5
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}
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# Prepare the file to be watched
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mkdir dir && echo 'inotify' > dir/file || framework_failure_
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#tail must print content of the file to stdout, verify
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timeout 60 tail --pid=$$ -F dir/file >out 2>&1 & pid=$!
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grep_timeout_ 'inotify' 'out' ||
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{ cleanup_fail_ 'file to be tailed does not exist'; }
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inotify_failed_re='inotify (resources exhausted|cannot be used)'
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grep -E "$inotify_failed_re" out &&
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skip_ "inotify can't be used"
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# Remove the directory, should get the message about the deletion
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rm -r dir || framework_failure_
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grep_timeout_ 'polling' 'out' ||
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{ cleanup_fail_ 'tail did not switch to polling mode'; }
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# Recreate the dir, must get a message about recreation
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mkdir dir && touch dir/file || framework_failure_
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grep_timeout_ 'appeared' 'out' ||
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{ cleanup_fail_ 'previously removed file did not appear'; }
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cleanup_
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# Expected result for the whole process
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cat <<\EOF > exp || framework_failure_
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inotify
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tail: 'dir/file' has become inaccessible: No such file or directory
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tail: directory containing watched file was removed
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tail: inotify cannot be used, reverting to polling
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tail: 'dir/file' has appeared; following new file
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EOF
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compare exp out || fail=1
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Exit $fail
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