tests/tail/append-only.sh

   1 #!/bin/sh
   2 # Ensure that tail -f works on an append-only file
   3 # Requires root access to do chattr +a, as well as an ext[23] or xfs file system
   4
   5 # Copyright (C) 2006-2024 Free Software Foundation, Inc.
   6
   7 # This program is free software: you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation, either version 3 of the License, or
  10 # (at your option) any later version.
  11
  12 # This program is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16
  17 # You should have received a copy of the GNU General Public License
  18 # along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19
  20 . "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
  21 print_ver_ tail
  22 require_root_
  23
  24 # Terminate any background tail process
  25 cleanup_() { kill $pid 2>/dev/null && wait $pid; }
  26
  27 chattr_a_works=1
  28 touch f
  29 chattr +a f 2>/dev/null || chattr_a_works=0
  30 ( echo x > f ) 2>/dev/null && chattr_a_works=0
  31 echo x >> f || chattr_a_works=0
  32
  33 if test $chattr_a_works = 0; then
  34   skip_ "chattr +a doesn't work on this file system"
  35 fi
  36
  37
  38 for mode in '' '---disable-inotify'; do
  39   sleep 1 & pid=$!
  40   tail --pid=$pid -f $mode f || fail=1
  41   cleanup_
  42 done
  43
  44 chattr -a f 2>/dev/null
  45
  46 Exit $fail