tests/tail-2/inotify-rotate

   1 #!/bin/sh
   2 # ensure that tail -F handles rotation
   3
   4 # Copyright (C) 2009-2012 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 if test "$VERBOSE" = yes; then
  20   set -x
  21   tail --version
  22 fi
  23
  24 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  25 expensive_
  26
  27 # Wait several seconds for grep REGEXP FILE to succeed.
  28 # Usage: grep_timeout REGEXP FILE
  29 grep_timeout()
  30 {
  31     local j
  32     for j in $(seq 150); do
  33         grep $1 $2 > /dev/null && return 0
  34         sleep 0.1
  35     done
  36     return 1
  37 }
  38
  39 # For details, see
  40 # http://lists.gnu.org/archive/html/bug-coreutils/2009-11/msg00213.html
  41
  42 # Perform at least this many iterations, because on multi-core systems
  43 # the offending sequence of events can be surprisingly uncommon.
  44 for i in $(seq 50); do
  45     echo $i
  46     rm -rf k x out
  47     # Normally less than a second is required here, but with heavy load
  48     # and a lot of disk activity, even 20 seconds is insufficient, which
  49     # leads to this timeout killing tail before the "ok" is written below.
  50     :>k && :>x && timeout 40 tail -F k > out 2>&1 &
  51     pid=$!
  52     sleep .1
  53     echo b > k;
  54     # wait for b to appear in out
  55     grep_timeout b out || fail_ failed to find b in out
  56     while :; do grep b out > /dev/null && break; done
  57     mv x k
  58     # wait for tail to detect the rename
  59     grep_timeout tail: out || { cat out; fail_ failed to detect rename; }
  60     echo ok >> k
  61     found=0
  62     # wait up to 10 seconds for "ok" to appear in out
  63     grep_timeout ok out && found=1
  64     kill $pid
  65     test $found = 0 && { cat out; fail_ failed to detect echoed '"ok"'; }
  66 done
  67
  68 Exit $fail