tests/tail/follow-stdin.sh

   1 #!/bin/sh
   2 # Test tail -f -
   3
   4 # Copyright (C) 2009-2024 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 #################
  23 # tail -f - would fail with the initial inotify implementation
  24
  25 check_tail_output()
  26 {
  27   local delay="$1"
  28   grep "$tail_re" out ||
  29     { sleep $delay; return 1; }
  30 }
  31
  32 # Terminate any background tail process
  33 cleanup_() { kill $pid 2>/dev/null && wait $pid; }
  34
  35 # Speedup the non inotify case
  36 fastpoll='-s.1 --max-unchanged-stats=1'
  37
  38 echo line > in || framework_failure_
  39 echo line > exp || framework_failure_
  40
  41 for mode in '' '---disable-inotify'; do
  42   > out || framework_failure_
  43
  44   tail $mode -f $fastpoll < in > out 2> err & pid=$!
  45
  46   # Wait up to 12.7s for output to appear:
  47   tail_re='line' retry_delay_ check_tail_output .1 7 ||
  48     { echo "$0: a: unexpected delay?"; cat out; fail=1; }
  49
  50   # Ensure there was no error output.
  51   compare /dev/null err || fail=1
  52
  53   cleanup_
  54 done
  55
  56
  57 #################
  58 # Before coreutils-8.26 this would induce an UMR under UBSAN
  59 returns_ 1 timeout 10 tail -f - <&- 2>errt || fail=1
  60 cat <<\EOF >exp || framework_failure_
  61 tail: cannot fstat 'standard input'
  62 tail: error reading 'standard input'
  63 tail: no files remaining
  64 tail: -
  65 EOF
  66 sed 's/\(tail:.*\):.*/\1/' errt > err || framework_failure_
  67 compare exp err || fail=1
  68
  69
  70 #################
  71 # Before coreutils-8.28 this would erroneously issue a warning
  72 if tty -s </dev/tty && test -t 0; then
  73   for input in '' '-' '/dev/tty'; do
  74     returns_ 124 timeout 0.1 tail -f $input 2>err || fail=1
  75     compare /dev/null err || fail=1
  76   done
  77
  78   tail -f - /dev/null </dev/tty 2> out & pid=$!
  79   # Wait up to 12.7s for output to appear:
  80   tail_re='ineffective' retry_delay_ check_tail_output .1 7 ||
  81     { cat out; fail=1; }
  82   cleanup_
  83 fi
  84
  85 Exit $fail