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# Trigger a failed assertion in coreutils-8.9 and earlier.
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# Copyright (C) 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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# We use a python-inotify script, so...
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python -m pyinotify -h > /dev/null \
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|| skip_ 'python inotify package not installed'
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# Move a directory "up" while du is processing its sub-directories.
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# While du is processing a hierarchy .../B/C/D/... this script
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# detects when du opens D/, and then moves C/ "up" one level
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# so that it is a sibling of B/.
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# Given the inherent race condition, we have to add enough "weight"
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# under D/ so that in most cases, the monitor performs the single
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# rename syscall before du finishes processing the subtree under D/.
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cat <<'EOF' > inotify-watch-for-dir-access.py
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import pyinotify as pn
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dest_parent = os.path.dirname(os.path.dirname(dir))
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dest = os.path.join(dest_parent, os.path.basename(dir))
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class ProcessDir(pn.ProcessEvent):
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def process_IN_OPEN(self, event):
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def process_default(self, event):
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wm = pn.WatchManager()
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notifier = pn.Notifier(wm)
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wm.watch_transient_file(dir, pn.IN_OPEN, ProcessDir)
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sys.stdout.write('started\n')
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chmod a+x inotify-watch-for-dir-access.py
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mkdir d2 || framework_failure_
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long=d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z
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# One iteration of this loop creates a tree with which
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# du sometimes completes its traversal before the above rename.
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# Five iterations was not enough in 2 of 7 "make -j20 check" runs on a
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# 6/12-core system. However, using "10", I saw no failure in 20 trials.
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# Using 10 iterations was not enough, either.
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# Using 30, I saw no failure in 200 trials.
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for i in $(seq 30); do
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mkdir -p $t/3/a/b/c/$i/$long || framework_failure_
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# Prohibit suspension, which could otherwise cause a timeout-induced FP failure.
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timeout 6 ./inotify-watch-for-dir-access.py $t/3/a/b > start-msg &
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# Wait for the watcher to start...
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nonempty() { test -s start-msg || { sleep $1; return 1; }; }
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retry_delay_ nonempty .1 5
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# The above watches for an IN_OPEN event on $t/3/a/b,
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# and when it triggers, moves the parent, $t/3/a, up one level
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# so it's directly under $t.
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# Before coreutils-8.10, du would abort.
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# check for the new diagnostic
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printf "du: fts_read failed: $t/3/a/b: No such file or directory\n" > exp \
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compare err exp || fail=1
added
removed
tests/du/move-dir-while-traversing
