tests/du/move-dir-while-traversing

   1 #!/bin/sh
   2 # Trigger a failed assertion in coreutils-8.9 and earlier.
   3
   4 # Copyright (C) 2011 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 <http://www.gnu.org/licenses/>.
  18
  19 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  20 print_ver_ du
  21
  22 # We use a python-inotify script, so...
  23 python -m pyinotify -h > /dev/null \
  24   || skip_ 'python inotify package not installed'
  25
  26 # Move a directory "up" while du is processing its sub-directories.
  27 # While du is processing a hierarchy .../B/C/D/... this script
  28 # detects when du opens D/, and then moves C/ "up" one level
  29 # so that it is a sibling of B/.
  30 # Given the inherent race condition, we have to add enough "weight"
  31 # under D/ so that in most cases, the monitor performs the single
  32 # rename syscall before du finishes processing the subtree under D/.
  33
  34 cat <<'EOF' > inotify-watch-for-dir-access.py
  35 #!/usr/bin/env python
  36 import pyinotify as pn
  37 import os,sys
  38
  39 dir = sys.argv[1]
  40 dest_parent = os.path.dirname(os.path.dirname(dir))
  41 dest = os.path.join(dest_parent, os.path.basename(dir))
  42
  43 class ProcessDir(pn.ProcessEvent):
  44
  45     def process_IN_OPEN(self, event):
  46         os.rename(dir, dest)
  47         sys.exit(0)
  48
  49     def process_default(self, event):
  50         pass
  51
  52 wm = pn.WatchManager()
  53 notifier = pn.Notifier(wm)
  54 wm.watch_transient_file(dir, pn.IN_OPEN, ProcessDir)
  55 sys.stdout.write('started\n')
  56 sys.stdout.flush()
  57 notifier.loop()
  58 EOF
  59 chmod a+x inotify-watch-for-dir-access.py
  60
  61 t=T/U
  62 mkdir d2 || framework_failure_
  63 long=d/e/f/g/h/i/j/k/l/m/n/o/p/q/r/s/t/u/v/w/x/y/z
  64 # One iteration of this loop creates a tree with which
  65 # du sometimes completes its traversal before the above rename.
  66 # Five iterations was not enough in 2 of 7 "make -j20 check" runs on a
  67 # 6/12-core system.  However, using "10", I saw no failure in 20 trials.
  68 # Using 10 iterations was not enough, either.
  69 # Using 50, I saw no failure in 200 trials.
  70 for i in $(seq 50); do
  71   mkdir -p $t/3/a/b/c/$i/$long || framework_failure_
  72 done
  73
  74 # Prohibit suspension, which could otherwise cause a timeout-induced FP failure.
  75 trap '' TSTP
  76
  77 timeout 6 ./inotify-watch-for-dir-access.py $t/3/a/b > start-msg &
  78
  79 # Wait for the watcher to start...
  80 nonempty() { test -s start-msg || { sleep $1; return 1; }; }
  81 retry_delay_ nonempty .1 5
  82
  83 # The above watches for an IN_OPEN event on $t/3/a/b,
  84 # and when it triggers, moves the parent, $t/3/a, up one level
  85 # so it's directly under $t.
  86
  87 du -a $t d2 2> err
  88 # Before coreutils-8.10, du would abort.
  89 test $? = 1 || fail=1
  90
  91 # check for the new diagnostic
  92 printf "du: fts_read failed: $t/3/a/b: No such file or directory\n" > exp \
  93   || fail=1
  94 compare err exp || fail=1
  95
  96 Exit $fail