tests/tail-2/F-vs-rename

   1 #!/bin/sh
   2 # demonstrate that tail -F works when renaming the tailed files
   3 # Before coreutils-8.3, tail -F a b would stop tracking additions to b
   4 # after "mv a b".
   5
   6 # Copyright (C) 2009-2011 Free Software Foundation, Inc.
   7
   8 # This program is free software: you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation, either version 3 of the License, or
  11 # (at your option) any later version.
  12
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 . "${srcdir=.}/init.sh"; path_prepend_ ../src
  22 print_ver_ tail
  23
  24 touch a b || framework_failure_
  25
  26 debug='---disable-inotify'
  27 debug=
  28 tail $debug -F -s.1 a b > out 2>&1 & pid=$!
  29
  30 check_tail_output()
  31 {
  32   local delay="$1"
  33   grep "$tail_re" out > /dev/null ||
  34     { sleep $delay; return 1; }
  35 }
  36
  37 # Wait up to 6.3s for tail to start
  38 echo x > a
  39 tail_re='^x$' retry_delay_ check_tail_output .1 7 || fail=1
  40
  41 mv a b || fail=1
  42
  43 # Wait 6.3s for this diagnostic:
  44 # tail: `a' has become inaccessible: No such file or directory
  45 tail_re='inaccessible' retry_delay_ check_tail_output .1 7 || fail=1
  46
  47 echo x > a
  48 # Wait up to 6.3s for this to appear in the output:
  49 # "tail: `...' has appeared;  following end of new file"
  50 tail_re='has appeared' retry_delay_ check_tail_output .1 7 ||
  51   { echo "$0: a: unexpected delay?"; cat out; fail=1; }
  52
  53 echo y >> b
  54 # Wait up to 6.3s for "y" to appear in the output:
  55 tail_f_vs_rename_2() {
  56   local delay="$1"
  57   tr '\n' @ < out | grep '@@==> b <==@y@$' > /dev/null ||
  58     { sleep $delay; return 1; }
  59 }
  60 retry_delay_ tail_f_vs_rename_2 .1 7 ||
  61   { echo "$0: b: unexpected delay?"; cat out; fail=1; }
  62
  63 echo z >> a
  64 # Wait up to 6.3s for "z" to appear in the output:
  65 tail_f_vs_rename_3() {
  66   local delay="$1"
  67   tr '\n' @ < out | grep '@@==> a <==@z@$' > /dev/null ||
  68     { sleep $delay; return 1; }
  69 }
  70 retry_delay_ tail_f_vs_rename_3 .1 7 ||
  71   { echo "$0: a: unexpected delay?"; cat out; fail=1; }
  72
  73 kill -HUP $pid
  74
  75 Exit $fail