tests/du/move-dir-while-traversing.sh

   1 #!/bin/sh
   2 # Trigger a failed assertion in coreutils-8.9 and earlier.
   3
   4 # Copyright (C) 2011-2018 Free Software Foundation, Inc.
   5
   6 # This program is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  20 print_ver_ du
  21 require_trap_signame_
  22
  23 # We use a python-inotify script, so...
  24 python -m pyinotify -h > /dev/null \
  25   || skip_ 'python inotify package not installed'
  26
  27 # Move a directory "up" while du is processing its sub-directories.
  28 # While du is processing a hierarchy .../B/C/D/... this script
  29 # detects when du opens D/, and then moves C/ "up" one level
  30 # so that it is a sibling of B/.
  31 # Given the inherent race condition, we have to add enough "weight"
  32 # under D/ so that in most cases, the monitor performs the single
  33 # rename syscall before du finishes processing the subtree under D/.
  34
  35 cat <<'EOF' > inotify-watch-for-dir-access.py
  36 #!/usr/bin/env python
  37 import pyinotify as pn
  38 import os,sys
  39
  40 dir = sys.argv[1]
  41 dest_parent = os.path.dirname(os.path.dirname(dir))
  42 dest = os.path.join(dest_parent, os.path.basename(dir))
  43
  44 class ProcessDir(pn.ProcessEvent):
  45
  46     def process_IN_OPEN(self, event):
  47         os.rename(dir, dest)
  48         sys.exit(0)
  49
  50     def process_default(self, event):
  51         pass
  52
  53 wm = pn.WatchManager()
  54 notifier = pn.Notifier(wm)
  55 wm.watch_transient_file(dir, pn.IN_OPEN, ProcessDir)
  56 sys.stdout.write('started\n')
  57 sys.stdout.flush()
  58 notifier.loop()
  59 EOF
  60 chmod a+x inotify-watch-for-dir-access.py
  61
  62 t=T/U
  63 mkdir d2 || framework_failure_
  64 long=d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z
  65 # One iteration of this loop creates a tree with which
  66 # du sometimes completes its traversal before the above rename.
  67 # Five iterations was not enough in 2 of 7 "make -j20 check" runs on a
  68 # 6/12-core system.  However, using "10", I saw no failure in 20 trials.
  69 # Using 10 iterations was not enough, either.
  70 # Using 50, I saw no failure in 200 trials.
  71 for i in $(seq 50); do
  72   mkdir -p $t/3/a/b/c/$i/$long || framework_failure_
  73 done
  74
  75 # Terminate any background cp process
  76 cleanup_() { kill $pid 2>/dev/null && wait $pid; }
  77
  78 # Prohibit suspension, which could otherwise cause a timeout-induced FP failure.
  79 trap '' TSTP
  80
  81 timeout 6 ./inotify-watch-for-dir-access.py $t/3/a/b > start-msg & pid=$!
  82
  83 # Wait for the watcher to start...
  84 nonempty() { sleep $1; test -s start-msg; }
  85 retry_delay_ nonempty .1 5 || fail=1
  86
  87 # The above watches for an IN_OPEN event on $t/3/a/b,
  88 # and when it triggers, moves the parent, $t/3/a, up one level
  89 # so it's directly under $t.
  90
  91 # Before coreutils-8.10, du would abort.
  92 returns_ 1 du -a $t d2 2> err || fail=1
  93
  94 # check for the new diagnostic
  95 printf "du: fts_read failed: $t/3/a/b: No such file or directory\n" > exp \
  96   || fail=1
  97 compare exp err || fail=1
  98
  99 Exit $fail