tests/tail/truncate.sh

   1 #!/bin/sh
   2 # Ensure all logs are output upon file truncation
   3
   4 # Copyright (C) 2015-2024 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_ tail
  21
  22 check_tail_output()
  23 {
  24   local delay="$1"
  25   grep "$tail_re" out > /dev/null ||
  26     { sleep $delay; return 1; }
  27 }
  28
  29 # Terminate any background tail process
  30 cleanup_() { kill $pid 2>/dev/null && wait $pid; }
  31
  32 # Speedup the non inotify case
  33 fastpoll='-s.1 --max-unchanged-stats=1'
  34
  35 for follow in '-f' '-F'; do
  36   for mode in '' '---disable-inotify'; do
  37     rm -f out
  38     seq 10 > f || framework_failure_
  39
  40     tail $follow $mode $fastpoll f > out 2>&1 & pid=$!
  41
  42     # Wait up to 12.7s for tail to start
  43     tail_re='^10$' retry_delay_ check_tail_output .1 7 ||
  44       { cat out; fail=1; }
  45
  46     seq 11 15 > f || framework_failure_
  47
  48     # Wait up to 12.7s for new data
  49     tail_re='^15$' retry_delay_ check_tail_output .1 7 ||
  50       { cat out; fail=1; }
  51
  52     cleanup_
  53   done
  54 done
  55
  56 Exit $fail